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Fix Lovelace Empty Menu when not advanced or admin (#11660 )
2026-05-18 15:17:09 +00:00 · 2022-02-11 15:36:39 -06:00 · 2022-02-11 12:18:03 -06:00 · 2022-02-11 10:31:45 -06:00 · 2022-02-11 14:05:07 +01:00 · 2022-02-10 14:12:12 -08:00
2011 changed files with 367394 additions and 144779 deletions
@@ -0,0 +1,13 @@
+# See here for image contents: https://github.com/microsoft/vscode-dev-containers/tree/v0.148.1/containers/python-3/.devcontainer/base.Dockerfile
+FROM mcr.microsoft.com/vscode/devcontainers/python:0-3.9
+
+ENV \
+  DEBIAN_FRONTEND=noninteractive \
+  DEVCONTAINER=true \
+  PATH=$PATH:./node_modules/.bin
+
+# Install nvm
+COPY .nvmrc /tmp/.nvmrc
+RUN \
+  su vscode -c \
+    "source /usr/local/share/nvm/nvm.sh && nvm install $(cat /tmp/.nvmrc) 2>&1"
@@ -0,0 +1,34 @@
+{
+  "name": "Home Assistant Frontend",
+  "build": {
+    "dockerfile": "Dockerfile",
+    "context": ".."
+  },
+  "appPort": "8124:8123",
+  "context": "..",
+  "postCreateCommand": "script/bootstrap",
+  "extensions": [
+    "github.vscode-pull-request-github",
+    "dbaeumer.vscode-eslint",
+    "ms-vscode.vscode-typescript-tslint-plugin",
+    "esbenp.prettier-vscode",
+    "bierner.lit-html",
+    "runem.lit-plugin",
+    "ms-python.vscode-pylance"
+  ],
+  "settings": {
+    "terminal.integrated.shell.linux": "/bin/bash",
+    "files.eol": "\n",
+    "editor.tabSize": 2,
+    "editor.formatOnPaste": false,
+    "editor.formatOnSave": true,
+    "editor.formatOnType": true,
+    "[typescript]": {
+      "editor.defaultFormatter": "esbenp.prettier-vscode"
+    },
+    "[javascript]": {
+      "editor.defaultFormatter": "esbenp.prettier-vscode"
+    },
+    "files.trimTrailingWhitespace": true
+  }
+}
@@ -1,4 +0,0 @@
-node_modules
-hass_frontend
-hass_frontend_es5
-.git
@@ -1,80 +0,0 @@
-{
-  "extends": ["airbnb-base", "prettier"],
-  "parserOptions": {
-    "ecmaVersion": "2020",
-    "ecmaFeatures": {
-      "jsx": true,
-      "modules": true
-    }
-  },
-  "settings": {
-    "react": {
-      "pragma": "h",
-      "version": "15.0"
-    },
-    "import/resolver": {
-      "webpack": {
-        "config": "webpack.config.js"
-      }
-    }
-  },
-  "globals": {
-    "__DEV__": false,
-    "__DEMO__": false,
-    "__BUILD__": false,
-    "__VERSION__": false,
-    "__STATIC_PATH__": false,
-    "Polymer": true,
-    "webkitSpeechRecognition": false,
-    "ResizeObserver": false
-  },
-  "env": {
-    "browser": true,
-    "mocha": true
-  },
-  "rules": {
-    "class-methods-use-this": 0,
-    "new-cap": 0,
-    "prefer-template": 0,
-    "object-shorthand": 0,
-    "func-names": 0,
-    "prefer-arrow-callback": 0,
-    "no-underscore-dangle": 0,
-    "no-var": 0,
-    "strict": 0,
-    "prefer-spread": 0,
-    "no-plusplus": 0,
-    "no-bitwise": 0,
-    "comma-dangle": 0,
-    "vars-on-top": 0,
-    "no-continue": 0,
-    "no-param-reassign": 0,
-    "no-multi-assign": 0,
-    "radix": 0,
-    "no-alert": 0,
-    "no-return-await": 0,
-    "prefer-destructuring": 0,
-    "no-restricted-globals": [2, "event"],
-    "prefer-promise-reject-errors": 0,
-    "import/prefer-default-export": 0,
-    "import/no-unresolved": 0,
-    "import/extensions": [2, "ignorePackages"],
-    "object-curly-newline": 0,
-    "default-case": 0,
-    "react/jsx-no-bind": [2, { "ignoreRefs": true }],
-    "react/jsx-no-duplicate-props": 2,
-    "react/self-closing-comp": 2,
-    "react/prefer-es6-class": 2,
-    "react/no-string-refs": 2,
-    "react/require-render-return": 2,
-    "react/no-find-dom-node": 2,
-    "react/no-is-mounted": 2,
-    "react/jsx-no-comment-textnodes": 2,
-    "react/jsx-no-undef": 2,
-    "react/jsx-uses-react": 2,
-    "react/jsx-uses-vars": 2,
-    "no-restricted-syntax": [0, "ForOfStatement"],
-    "prettier/prettier": "error"
-  },
-  "plugins": ["react", "prettier"]
-}
@@ -1,12 +1,119 @@
 {
-  "extends": "./.eslintrc-hound.json",
-  "plugins": ["react"],
+  "extends": [
+    "airbnb-base",
+    "airbnb-typescript/base",
+    "plugin:@typescript-eslint/recommended",
+    "plugin:wc/recommended",
+    "plugin:lit/all",
+    "prettier"
+  ],
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "ecmaVersion": 2020,
+    "ecmaFeatures": {
+      "modules": true
+    },
+    "sourceType": "module",
+    "project": "./tsconfig.json"
+  },
+  "settings": {
+    "import/resolver": {
+      "webpack": {
+        "config": "./webpack.config.js"
+      }
+    }
+  },
+  "globals": {
+    "__DEV__": false,
+    "__DEMO__": false,
+    "__BUILD__": false,
+    "__VERSION__": false,
+    "__STATIC_PATH__": false,
+    "__SUPERVISOR__": false,
+    "Polymer": true
+  },
  "env": {
-    "browser": true
+    "browser": true,
+    "es6": true
  },
  "rules": {
-    "import/no-unresolved": 2,
-    "linebreak-style": 0,
-    "implicit-arrow-linebreak": 0
-  }
+    "class-methods-use-this": "off",
+    "new-cap": "off",
+    "prefer-template": "off",
+    "object-shorthand": "off",
+    "func-names": "off",
+    "no-underscore-dangle": "off",
+    "strict": "off",
+    "no-plusplus": "off",
+    "no-bitwise": "error",
+    "comma-dangle": "off",
+    "vars-on-top": "off",
+    "no-continue": "off",
+    "no-param-reassign": "off",
+    "no-multi-assign": "off",
+    "no-console": "error",
+    "radix": "off",
+    "no-alert": "off",
+    "no-nested-ternary": "off",
+    "prefer-destructuring": "off",
+    "no-restricted-globals": [2, "event"],
+    "prefer-promise-reject-errors": "off",
+    "import/prefer-default-export": "off",
+    "import/no-default-export": "off",
+    "import/no-unresolved": "off",
+    "import/no-cycle": "off",
+    "import/extensions": [
+      "error",
+      "ignorePackages",
+      { "ts": "never", "js": "never" }
+    ],
+    "no-restricted-syntax": ["error", "LabeledStatement", "WithStatement"],
+    "object-curly-newline": "off",
+    "default-case": "off",
+    "wc/no-self-class": "off",
+    "no-shadow": "off",
+    "@typescript-eslint/camelcase": "off",
+    "@typescript-eslint/ban-ts-comment": "off",
+    "@typescript-eslint/no-use-before-define": "off",
+    "@typescript-eslint/no-non-null-assertion": "off",
+    "@typescript-eslint/no-explicit-any": "off",
+    "@typescript-eslint/explicit-function-return-type": "off",
+    "@typescript-eslint/explicit-module-boundary-types": "off",
+    "@typescript-eslint/no-shadow": ["error"],
+    "@typescript-eslint/naming-convention": [
+      "off",
+      {
+        "selector": "default",
+        "format": ["camelCase", "snake_case"],
+        "leadingUnderscore": "allow",
+        "trailingUnderscore": "allow"
+      },
+      {
+        "selector": ["variable"],
+        "format": ["camelCase", "snake_case", "UPPER_CASE"],
+        "leadingUnderscore": "allow",
+        "trailingUnderscore": "allow"
+      },
+      {
+        "selector": "typeLike",
+        "format": ["PascalCase"]
+      }
+    ],
+    "@typescript-eslint/no-unused-vars": "off",
+    "unused-imports/no-unused-vars": [
+      "error",
+      {
+        "vars": "all",
+        "varsIgnorePattern": "^_",
+        "args": "after-used",
+        "argsIgnorePattern": "^_",
+        "ignoreRestSiblings": true
+      }
+    ],
+    "unused-imports/no-unused-imports": "error",
+    "lit/attribute-value-entities": "off",
+    "lit/no-template-map": "off"
+  },
+  "plugins": ["disable", "unused-imports"],
+  "processor": "disable/disable"
 }
@@ -11,3 +11,4 @@
 *.mp3 binary

 demo/public/api/camera_proxy_stream/* binary
+demo/public/api/media_player_proxy/* binary
@@ -0,0 +1,100 @@
+---
+name: Report a bug with the UI, Frontend or Lovelace
+about: Report an issue related to the Home Assistant frontend.
+labels: bug
+---
+
+<!-- READ THIS FIRST:
+- If you need additional help with this template please refer to https://www.home-assistant.io/help/reporting_issues/
+- Make sure you are running the latest version of Home Assistant before reporting an issue: https://github.com/home-assistant/home-assistant/releases
+- Do not report issues for custom Lovelace cards.
+- Provide as many details as possible. Paste logs, configuration samples and code into the backticks.
+DO NOT DELETE ANY TEXT from this template! Otherwise, your issue may be closed without comment.
+-->
+
+## Checklist
+
+- [ ] I have updated to the latest available Home Assistant version.
+- [ ] I have cleared the cache of my browser.
+- [ ] I have tried a different browser to see if it is related to my browser.
+
+## The problem
+
+<!--
+  Describe the issue you are experiencing here to communicate to the
+  maintainers. Tell us about the current behavior.
+  If possible provide a screenshot with a description.
+-->
+
+## Expected behavior
+
+<!--
+  Describe what you expected to happen or it should look/behave.
+  If possible provide a screenshot with a description.
+-->
+
+## Steps to reproduce
+
+<!--
+  Provide steps for us, that helps reproducing your issue.
+  For example:
+    1. Add a climate integration
+    2. Navigate to Lovelace
+    3. Click more info of the climate entity
+    4. Set the HVAC action to heat
+    5. Set the temperature higher than the current temperature
+    6. Set the HVAC action to cool
+-->
+
+## Environment
+
+<!--
+  Provide details about the versions you are using, which helps us reproducing
+  and finding the issue quicker. Version information is found in the
+  Home Assistant frontend: Configuration -> Info.
+
+  Browser version and operating system is important! Please try to replicate
+  your issue in a different browser and be sure to include your findings.
+-->
+
+- Home Assistant release with the issue:
+- Last working Home Assistant release (if known):
+- Browser and browser version:
+- Operating system:
+
+## State of relevant entities
+
+<!--
+  If your issue is about how an entity is shown in the UI, please add the state
+  and attributes for all situations with a screenshot of the UI.
+  You can find this information at `/developer-tools/state`
+-->
+
+```yaml
+
+```
+
+## Problem-relevant frontend configuration
+
+<!--
+  An example configuration that caused the problem for you, e.g. the YAML configuration
+  of the used cards. Fill this out even if it seems unimportant to you. Please be sure
+  to remove personal information like passwords, private URLs and other credentials.
+-->
+
+```yaml
+
+```
+
+## Javascript errors shown in your browser console/inspector
+
+<!--
+  If you come across any Javascript or other error logs, e.g. in your browser
+  console/inspector please provide them.
+-->
+
+```txt
+
+```
+
+## Additional information
@@ -1,53 +0,0 @@
---
-name: Bug report
-about: Create a report to help us improve
-title: ""
-labels: bug
-assignees: ""
---
-
-<!-- READ THIS FIRST:
- If you need additional help with this template please refer to https://www.home-assistant.io/help/reporting_issues/
- Make sure you are running the latest version of Home Assistant before reporting an issue: https://github.com/home-assistant/home-assistant/releases
- Provide as many details as possible. Do not delete any text from this template!
-->
-
-**Checklist:**
-
- [ ] I updated to the latest version available
- [ ] I cleared the cache of my browser
-
-**Home Assistant release with the issue:**
-
-<!--
- Frontend -> Developer tools -> Info
- Or use this command: hass --version
-->
-
-**Last working Home Assistant release (if known):**
-
-**UI (States or Lovelace UI?):**
-
-<!--
- Frontend -> Developer tools -> Info
-->
-
-**Browser and Operating System:**
-
-<!--
-Provide details about what browser (and version) you are seeing the issue in. And also which operating system this is on. If possible try to replicate the issue in other browsers and include your findings here.
-->
-
-**Description of problem:**
-
-<!--
-Explain what the issue is, and how things should look/behave. If possible provide a screenshot with a description.
-->
-
-**Javascript errors shown in the web inspector (if applicable):**
-
-```
-
-```
-
-**Additional information:**
@@ -0,0 +1,121 @@
+name: Report a bug with the UI, Frontend or Lovelace
+description: Report an issue related to the Home Assistant frontend.
+labels: bug
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Make sure you are running the [latest version of Home Assistant][releases] before reporting an issue.
+
+        If you have a feature or enhancement request for the frontend, please [start an discussion][fr] instead of creating an issue.
+
+        **Please not not report issues for custom Lovelace cards.**
+
+        [fr]: https://github.com/home-assistant/frontend/discussions
+        [releases]: https://github.com/home-assistant/home-assistant/releases
+  - type: checkboxes
+    attributes:
+      label: Checklist
+      description: Please verify that you've followed these steps
+      options:
+        - label: I have updated to the latest available Home Assistant version.
+          required: true
+        - label: I have cleared the cache of my browser.
+          required: true
+        - label: I have tried a different browser to see if it is related to my browser.
+          required: true
+  - type: markdown
+    attributes:
+      value: |
+        ## The problem
+  - type: textarea
+    validations:
+      required: true
+    attributes:
+      label: Describe the issue you are experiencing
+      description: Provide a clear and concise description of what the bug is.
+  - type: textarea
+    validations:
+      required: true
+    attributes:
+      label: Describe the behavior you expected
+      description: Describe what you expected to happen or it should look/behave.
+  - type: textarea
+    validations:
+      required: true
+    attributes:
+      label: Steps to reproduce the issue
+      description: |
+        Please tell us exactly how to reproduce your issue.
+        Provide clear and concise step by step instructions and add code snippets if needed.
+      value: |
+        1.
+        2.
+        3.
+        ...
+  - type: markdown
+    attributes:
+      value: |
+        ## Environment
+  - type: input
+    validations:
+      required: true
+    attributes:
+      label: What version of Home Assistant Core has the issue?
+      placeholder: core-
+      description: >
+        Can be found in the Configuration panel -> Info.
+  - type: input
+    attributes:
+      label: What was the last working version of Home Assistant Core?
+      placeholder: core-
+      description: >
+        If known, otherwise leave blank.
+  - type: input
+    attributes:
+      label: In which browser are you experiencing the issue with?
+      placeholder: Google Chrome 88.0.4324.150
+      description: >
+        Provide the full name and don't forget to add the version!
+  - type: input
+    attributes:
+      label: Which operating system are you using to run this browser?
+      placeholder: macOS Big Sur (1.11)
+      description: >
+        Don't forget to add the version!
+  - type: markdown
+    attributes:
+      value: |
+        # Details
+
+  - type: textarea
+    attributes:
+      label: State of relevant entities
+      description: >
+        If your issue is about how an entity is shown in the UI, please add the
+        state and attributes for all situations. You can find this information
+        at Developer Tools -> States.
+      render: txt
+  - type: textarea
+    attributes:
+      label: Problem-relevant frontend configuration
+      description: >
+        An example configuration that caused the problem for you, e.g., the YAML
+        configuration of the used cards. Fill this out even if it seems
+        unimportant to you. Please be sure to remove personal information like
+        passwords, private URLs and other credentials.
+      render: yaml
+  - type: textarea
+    attributes:
+      label: Javascript errors shown in your browser console/inspector
+      description: >
+        If you come across any Javascript or other error logs, e.g., in your
+        browser console/inspector please provide them.
+      render: txt
+  - type: textarea
+    attributes:
+      label: Additional information
+      description: >
+        If you have any additional information for us, use the field below.
+        Please note, you can attach screenshots or screen recordings here, by
+        dragging and dropping files in the field below.
@@ -0,0 +1,17 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Request a feature for the UI, Frontend or Lovelace
+    url: https://github.com/home-assistant/frontend/discussions/category_choices
+    about: Request an new feature for the Home Assistant frontend.
+  - name: Report a bug that is NOT related to the UI, Frontend or Lovelace
+    url: https://github.com/home-assistant/core/issues
+    about: This is the issue tracker for our frontend. Please report other issues with the backend repository.
+  - name: Report incorrect or missing information on our website
+    url: https://github.com/home-assistant/home-assistant.io/issues
+    about: Our documentation has its own issue tracker. Please report issues with the website there.
+  - name: I have a question or need support
+    url: https://www.home-assistant.io/help
+    about: We use GitHub for tracking bugs, check our website for resources on getting help.
+  - name: I'm unsure where to go
+    url: https://www.home-assistant.io/join-chat
+    about: If you are unsure where to go, then joining our chat is recommended; Just ask!
@@ -1,19 +0,0 @@
---
-name: Feature request
-about: Suggest an idea for this project
-title: ""
-labels: feature request
-assignees: ""
---
-
-**Is your feature request related to a problem? Please describe.**
-A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
-
-**Describe the solution you'd like**
-A clear and concise description of what you want to happen.
-
-**Describe alternatives you've considered**
-A clear and concise description of any alternative solutions or features you've considered.
-
-**Additional context**
-Add any other context or screenshots about the feature request here.
@@ -0,0 +1,83 @@
+<!--
+  You are amazing! Thanks for contributing to our project!
+  Please, DO NOT DELETE ANY TEXT from this template! (unless instructed).
+-->
+
+## Breaking change
+
+<!--
+  If your PR contains a breaking change for existing users, it is important
+  to tell them what breaks, how to make it work again and why we did this.
+  This piece of text is published with the release notes, so it helps if you
+  write it towards our users, not us.
+  Note: Remove this section if this PR is NOT a breaking change.
+-->
+
+## Proposed change
+
+<!--
+  Describe the big picture of your changes here to communicate to the
+  maintainers why we should accept this pull request. If it fixes a bug
+  or resolves a feature request, be sure to link to that issue or discussion
+  in the additional information section.
+-->
+
+## Type of change
+
+<!--
+  What type of change does your PR introduce to the Home Assistant frontend?
+  NOTE: Please, check only 1! box!
+  If your PR requires multiple boxes to be checked, you'll most likely need to
+  split it into multiple PRs. This makes things easier and faster to code review.
+-->
+
+- [ ] Dependency upgrade
+- [ ] Bugfix (non-breaking change which fixes an issue)
+- [ ] New feature (thank you!)
+- [ ] Breaking change (fix/feature causing existing functionality to break)
+- [ ] Code quality improvements to existing code or addition of tests
+
+## Example configuration
+
+<!--
+  Supplying a configuration snippet, makes it easier for a maintainer to test
+  your PR.
+-->
+
+```yaml
+
+```
+
+## Additional information
+
+<!--
+  Details are important, and help maintainers processing your PR.
+  Please be sure to fill out additional details, if applicable.
+-->
+
+- This PR fixes or closes issue: fixes #
+- This PR is related to issue or discussion:
+- Link to documentation pull request:
+
+## Checklist
+
+<!--
+  Put an `x` in the boxes that apply. You can also fill these out after
+  creating the PR. If you're unsure about any of them, don't hesitate to ask.
+  We're here to help! This is simply a reminder of what we are going to look
+  for before merging your code.
+-->
+
+- [ ] The code change is tested and works locally.
+- [ ] There is no commented out code in this PR.
+- [ ] Tests have been added to verify that the new code works.
+
+If user exposed functionality or configuration variables are added/changed:
+
+- [ ] Documentation added/updated for [www.home-assistant.io][docs-repository]
+
+<!--
+  Thank you for contributing <3
+-->
+
+[docs-repository]: https://github.com/home-assistant/home-assistant.io
@@ -0,0 +1,97 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - dev
+      - master
+  pull_request:
+    branches:
+      - dev
+      - master
+
+env:
+  NODE_VERSION: 14
+  NODE_OPTIONS: --max_old_space_size=6144
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out files from GitHub
+        uses: actions/checkout@v2
+      - name: Set up Node ${{ env.NODE_VERSION }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ env.NODE_VERSION }}
+          cache: yarn
+      - name: Install dependencies
+        run: yarn install
+        env:
+          CI: true
+      - name: Build resources
+        run: ./node_modules/.bin/gulp gen-icons-json build-translations build-locale-data gather-gallery-pages
+      - name: Run eslint
+        run: yarn run lint:eslint
+      - name: Run tsc
+        run: yarn run lint:types
+      - name: Run prettier
+        run: yarn run lint:prettier
+      - name: Check for duplicate dependencies
+        run: yarn dedupe --check
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out files from GitHub
+        uses: actions/checkout@v2
+      - name: Set up Node ${{ env.NODE_VERSION }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ env.NODE_VERSION }}
+          cache: yarn
+      - name: Install dependencies
+        run: yarn install
+        env:
+          CI: true
+      - name: Build resources
+        run: ./node_modules/.bin/gulp build-translations build-locale-data
+      - name: Run Tests
+        run: yarn run test
+  build:
+    runs-on: ubuntu-latest
+    needs: [lint, test]
+    steps:
+      - name: Check out files from GitHub
+        uses: actions/checkout@v2
+      - name: Set up Node ${{ env.NODE_VERSION }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ env.NODE_VERSION }}
+          cache: yarn
+      - name: Install dependencies
+        run: yarn install
+        env:
+          CI: true
+      - name: Build Application
+        run: ./node_modules/.bin/gulp build-app
+        env:
+          IS_TEST: "true"
+  supervisor:
+    runs-on: ubuntu-latest
+    needs: [lint, test]
+    steps:
+      - name: Check out files from GitHub
+        uses: actions/checkout@v2
+      - name: Set up Node ${{ env.NODE_VERSION }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ env.NODE_VERSION }}
+          cache: yarn
+      - name: Install dependencies
+        run: yarn install
+        env:
+          CI: true
+      - name: Build Application
+        run: ./node_modules/.bin/gulp build-hassio
+        env:
+          IS_TEST: "true"
@@ -0,0 +1,60 @@
+name: "CodeQL"
+
+on:
+  push:
+    branches: [dev, master]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [dev]
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        # Override automatic language detection by changing the below list
+        # Supported options are ['csharp', 'cpp', 'go', 'java', 'javascript', 'python']
+        language: ['javascript']
+        # Learn more...
+        # https://docs.github.com/en/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#overriding-automatic-language-detection
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+      with:
+        # We must fetch at least the immediate parents so that if this is
+        # a pull request then we can checkout the head.
+        fetch-depth: 2
+
+    # If this run was triggered by a pull request event, then checkout
+    # the head of the pull request instead of the merge commit.
+    - run: git checkout HEAD^2
+      if: ${{ github.event_name == 'pull_request' }}
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v1
+      with:
+        languages: ${{ matrix.language }}
+
+    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+    # If this step fails, then you should remove it and run the build manually (see below)
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v1
+
+    # ℹ️ Command-line programs to run using the OS shell.
+    # 📚 https://git.io/JvXDl
+
+    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
+    #    and modify them (or add more) to build your code if your project
+    #    uses a compiled language
+
+    #- run: |
+    #   make bootstrap
+    #   make release
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v1
@@ -0,0 +1,35 @@
+name: Demo
+
+on:
+  push:
+    branches:
+      - dev
+
+env:
+  NODE_VERSION: 14
+  NODE_OPTIONS: --max_old_space_size=6144
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out files from GitHub
+        uses: actions/checkout@v2
+      - name: Set up Node ${{ env.NODE_VERSION }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ env.NODE_VERSION }}
+          cache: yarn
+      - name: Install dependencies
+        run: yarn install
+        env:
+          CI: true
+      - name: Build Demo
+        run: ./node_modules/.bin/gulp build-demo
+      - name: Deploy to Netlify
+        uses: netlify/actions/cli@master
+        env:
+          NETLIFY_AUTH_TOKEN: ${{ secrets.NETLIFY_AUTH_TOKEN }}
+          NETLIFY_SITE_ID: ${{ secrets.NETLIFY_DEMO_DEV_SITE_ID }}
+        with:
+          args: deploy --dir=demo/dist --prod
@@ -0,0 +1,20 @@
+name: Lock
+
+# yamllint disable-line rule:truthy
+on:
+  schedule:
+    - cron: "0 * * * *"
+
+jobs:
+  lock:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: dessant/lock-threads@v2.0.1
+        with:
+          github-token: ${{ github.token }}
+          issue-lock-inactive-days: "30"
+          issue-exclude-created-before: "2020-10-01T00:00:00Z"
+          issue-lock-reason: ""
+          pr-lock-inactive-days: "1"
+          pr-exclude-created-before: "2020-11-01T00:00:00Z"
+          pr-lock-reason: ""
@@ -0,0 +1,19 @@
+name: Netlify
+
+on:
+  schedule:
+    - cron: "0 0 * * *"
+
+jobs:
+  trigger_builds:
+    name: Trigger netlify build preview
+    runs-on: "ubuntu-latest"
+    steps:
+      - name: Trigger Cast build
+        run: curl -X POST -d {} https://api.netlify.com/build_hooks/${{ secrets.NETLIFY_CAST_DEV_BUILD_HOOK }}
+
+      - name: Trigger Demo build
+        run: curl -X POST -d {} https://api.netlify.com/build_hooks/${{ secrets.NETLIFY_DEMO_DEV_BUILD_HOOK }}
+
+      - name: Trigger Design build
+        run: curl -X POST -d "NIGHTLY" https://api.netlify.com/build_hooks/${{ secrets.NETLIFY_GALLERY_DEV_BUILD_HOOK }}
@@ -0,0 +1,14 @@
+name: Release Drafter
+
+on:
+  push:
+    branches:
+      - dev
+
+jobs:
+  update_release_draft:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: release-drafter/release-drafter@v5
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
@@ -0,0 +1,91 @@
+name: Release
+
+on:
+  release:
+    types:
+      - published
+
+env:
+  PYTHON_VERSION: 3.8
+  NODE_VERSION: 14
+  NODE_OPTIONS: --max_old_space_size=6144
+
+jobs:
+  release:
+    name: Release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout the repository
+        uses: actions/checkout@v2
+
+      - name: Verify version
+        uses: home-assistant/actions/helpers/verify-version@master
+
+      - name: Set up Python ${{ env.PYTHON_VERSION }}
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+
+      - name: Set up Node ${{ env.NODE_VERSION }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ env.NODE_VERSION }}
+          cache: yarn
+
+      - name: Install dependencies
+        run: yarn install
+
+      - name: Download Translations
+        run: ./script/translations_download
+        env:
+          LOKALISE_TOKEN: ${{ secrets.LOKALISE_TOKEN }}
+      - name: Build and release package
+        run: |
+          python3 -m pip install twine build
+          export TWINE_USERNAME="__token__"
+          export TWINE_PASSWORD="${{ secrets.TWINE_TOKEN }}"
+
+          script/release
+
+  wheels-init:
+    name: Init wheels build
+    needs: release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Generate requirements.txt
+        run: |
+          # Sleep to give pypi time to populate the new version across mirrors
+          sleep 240
+          version=$(echo "${{ github.ref }}" | awk -F"/" '{print $NF}' )
+          echo "home-assistant-frontend==$version" > ./requirements.txt
+
+      - name: Upload requirements.txt
+        uses: actions/upload-artifact@v2
+        with:
+          name: requirements
+          path: ./requirements.txt
+
+  build-wheels:
+    name: Build wheels for ${{ matrix.arch }}
+    needs: wheels-init
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        arch: ["aarch64", "armhf", "armv7", "amd64", "i386"]
+        tag:
+          - "3.9-alpine3.14"
+    steps:
+      - name: Download requirements.txt
+        uses: actions/download-artifact@v2
+        with:
+          name: requirements
+
+      - name: Build wheels
+        uses: home-assistant/wheels@master
+        with:
+          tag: ${{ matrix.tag }}
+          arch: ${{ matrix.arch }}
+          wheels-host: ${{ secrets.WHEELS_HOST }}
+          wheels-key: ${{ secrets.WHEELS_KEY }}
+          wheels-user: wheels
+          requirements: "requirements.txt"
@@ -0,0 +1,42 @@
+name: Stale
+
+# yamllint disable-line rule:truthy
+on:
+  schedule:
+    - cron: "0 * * * *"
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - name: 90 days stale policy
+        uses: actions/stale@v3.0.13
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          days-before-stale: 90
+          days-before-close: 7
+          operations-per-run: 25
+          remove-stale-when-updated: true
+          stale-issue-label: "stale"
+          exempt-issue-labels: "no-stale,Help%20wanted,help-wanted,feature-request,feature%20request"
+          stale-issue-message: >
+            There hasn't been any activity on this issue recently. Due to the
+            high number of incoming GitHub notifications, we have to clean some
+            of the old issues, as many of them have already been resolved with
+            the latest updates.
+
+            Please make sure to update to the latest Home Assistant version and
+            check if that solves the issue. Let us know if that works for you by
+            adding a comment 👍
+
+            This issue has now been marked as stale and will be closed if no
+            further activity occurs. Thank you for your contributions.
+
+          stale-pr-label: "stale"
+          exempt-pr-labels: "no-stale"
+          stale-pr-message: >
+            There hasn't been any activity on this pull request recently. This
+            pull request has been automatically marked as stale because of that
+            and will be closed if no further activity occurs within 7 days.
+
+            Thank you for your contributions.
@@ -0,0 +1,25 @@
+name: Translations
+
+on:
+  push:
+    branches:
+      - dev
+    paths:
+      - src/translations/en.json
+
+env:
+  NODE_VERSION: 14
+
+jobs:
+  upload:
+    name: Upload
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout the repository
+        uses: actions/checkout@v2
+
+      - name: Upload Translations
+        run: |
+          export LOKALISE_TOKEN="${{ secrets.LOKALISE_TOKEN }}"
+
+          ./script/translations_upload_base
@@ -1,11 +1,22 @@
-build
-build-translations/*
-node_modules/*
-npm-debug.log
 .DS_Store
-hass_frontend/*
 .reify-cache
-demo/hademo-icons.html
+
+# build
+build
+hass_frontend/*
+dist
+
+# yarn
+.yarn/*
+!.yarn/patches
+!.yarn/releases
+!.yarn/plugins
+!.yarn/sdks
+!.yarn/versions
+.pnp.*
+node_modules/*
+yarn-error.log
+npm-debug.log

 # Python stuff
 *.py[cod]
@@ -15,19 +26,23 @@ demo/hademo-icons.html
 # venv stuff
 pyvenv.cfg
 pip-selfcheck.json
-venv
+venv/*
 .venv
-lib
-bin
-dist

 # vscode
 .vscode/*
 !.vscode/extensions.json
+!.vscode/launch.json
+!.vscode/tasks.json

-# Cast dev settings 
+# Cast dev settings
 src/cast/dev_const.ts

 # Secrets
 .lokalise_token
-yarn-error.log
+
+# asdf
+.tool-versions
+
+# Home Assistant config
+/config
@@ -1,6 +0,0 @@
-jshint:
-  enabled: false
-
-eslint:
-  enabled: true
-  config_file: .eslintrc-hound.json
@@ -1 +1 @@
-12.1
+14
@@ -0,0 +1,9 @@
+build
+translations/*
+node_modules/*
+hass_frontend/*
+pip-selfcheck.json
+
+# vscode
+.vscode/*
+!.vscode/extensions.json
@@ -1,27 +0,0 @@
-sudo: false
-language: node_js
-cache:
-  yarn: true
-  directories:
-    - bower_components
-install: yarn install
-script:
-  - npm run build
-  - hassio/script/build_hassio
-  # Because else eslint fails because hassio has cleaned that build
-  - ./node_modules/.bin/gulp gen-icons-app
-  - npm run test
-  # - xvfb-run wct --module-resolution=node --npm
-  # - 'if [ "${TRAVIS_PULL_REQUEST}" = "false" ]; then wct --module-resolution=node --npm --plugin sauce; fi'
-services:
-  - docker
-before_deploy:
-  - "docker pull lokalise/lokalise-cli@sha256:2198814ebddfda56ee041a4b427521757dd57f75415ea9693696a64c550cef21"
-deploy:
-  provider: script
-  script: script/travis_deploy
-  "on":
-    branch: master
-dist: trusty
-addons:
-  sauce_connect: true
@@ -1,7 +1,6 @@
 {
  "recommendations": [
    "dbaeumer.vscode-eslint",
-    "ms-vscode.vscode-typescript-tslint-plugin",
    "esbenp.prettier-vscode",
    "bierner.lit-html",
    "runem.lit-plugin"
@@ -0,0 +1,44 @@
+{
+  // https://github.com/microsoft/vscode-js-debug/blob/master/OPTIONS.md
+  "configurations": [
+    {
+      "name": "Debug Frontend",
+      "request": "launch",
+      "type": "pwa-chrome",
+      "url": "http://localhost:8123/",
+      "webRoot": "${workspaceFolder}/hass_frontend",
+      "disableNetworkCache": true,
+      "preLaunchTask": "Develop Frontend",
+      "outFiles": [
+        "${workspaceFolder}/hass_frontend/frontend_latest/*.js"
+      ]
+    },
+    {
+      "name": "Debug Gallery",
+      "request": "launch",
+      "type": "pwa-chrome",
+      "url": "http://localhost:8100/",
+      "webRoot": "${workspaceFolder}/gallery/dist",
+      "disableNetworkCache": true,
+      "preLaunchTask": "Develop Gallery"
+    },
+    {
+      "name": "Debug Demo",
+      "request": "launch",
+      "type": "pwa-chrome",
+      "url": "http://localhost:8090/",
+      "webRoot": "${workspaceFolder}/demo/dist",
+      "disableNetworkCache": true,
+      "preLaunchTask": "Develop Demo"
+    },
+    {
+      "name": "Debug Cast",
+      "request": "launch",
+      "type": "pwa-chrome",
+      "url": "http://localhost:8080/",
+      "webRoot": "${workspaceFolder}/cast/dist",
+      "disableNetworkCache": true,
+      "preLaunchTask": "Develop Cast"
+    },
+  ]
+}
@@ -0,0 +1,208 @@
+{
+  "version": "2.0.0",
+  "tasks": [
+    {
+      "label": "Develop Frontend",
+      "type": "gulp",
+      "task": "develop-app",
+      // Sync changes here to other tasks until issue resolved
+      // https://github.com/Microsoft/vscode/issues/61497
+      "problemMatcher": {
+        "owner": "ha-build",
+        "source": "ha-build",
+        "fileLocation": "absolute",
+        "severity": "error",
+        "pattern": [
+          {
+            "regexp": "(SyntaxError): (.+): (.+) \\((\\d+):(\\d+)\\)",
+            "severity": 1,
+            "file": 2,
+            "message": 3,
+            "line": 4,
+            "column": 5
+          }
+        ],
+        "background": {
+          "activeOnStart": true,
+          "beginsPattern": "Changes detected. Starting compilation",
+          "endsPattern": "Build done @"
+        }
+      },
+      "isBackground": true,
+      "group": {
+        "kind": "build",
+        "isDefault": true
+      },
+      "runOptions": {
+        "instanceLimit": 1
+      }
+    },
+    {
+      "label": "Develop Supervisor panel",
+      "type": "gulp",
+      "task": "develop-hassio",
+      "problemMatcher": {
+        "owner": "ha-build",
+        "source": "ha-build",
+        "fileLocation": "absolute",
+        "severity": "error",
+        "pattern": [
+          {
+            "regexp": "(SyntaxError): (.+): (.+) \\((\\d+):(\\d+)\\)",
+            "severity": 1,
+            "file": 2,
+            "message": 3,
+            "line": 4,
+            "column": 5
+          }
+        ],
+        "background": {
+          "activeOnStart": true,
+          "beginsPattern": "Changes detected. Starting compilation",
+          "endsPattern": "Build done @"
+        }
+      },
+      "isBackground": true,
+      "group": "build",
+      "runOptions": {
+        "instanceLimit": 1
+      }
+    },
+    {
+      "label": "Develop Gallery",
+      "type": "gulp",
+      "task": "develop-gallery",
+      "problemMatcher": {
+        "owner": "ha-build",
+        "source": "ha-build",
+        "fileLocation": "absolute",
+        "severity": "error",
+        "pattern": [
+          {
+            "regexp": "(SyntaxError): (.+): (.+) \\((\\d+):(\\d+)\\)",
+            "severity": 1,
+            "file": 2,
+            "message": 3,
+            "line": 4,
+            "column": 5
+          }
+        ],
+        "background": {
+          "activeOnStart": true,
+          "beginsPattern": "Changes detected. Starting compilation",
+          "endsPattern": "Build done @"
+        }
+      },
+
+      "isBackground": true,
+      "group": "build",
+      "runOptions": {
+        "instanceLimit": 1
+      }
+    },
+    {
+      "label": "Develop Demo",
+      "type": "gulp",
+      "task": "develop-demo",
+      "problemMatcher": {
+        "owner": "ha-build",
+        "source": "ha-build",
+        "fileLocation": "absolute",
+        "severity": "error",
+        "pattern": [
+          {
+            "regexp": "(SyntaxError): (.+): (.+) \\((\\d+):(\\d+)\\)",
+            "severity": 1,
+            "file": 2,
+            "message": 3,
+            "line": 4,
+            "column": 5
+          }
+        ],
+        "background": {
+          "activeOnStart": true,
+          "beginsPattern": "Changes detected. Starting compilation",
+          "endsPattern": "Build done @"
+        }
+      },
+
+      "isBackground": true,
+      "group": "build",
+      "runOptions": {
+        "instanceLimit": 1
+      }
+    },
+    {
+      "label": "Develop Cast",
+      "type": "gulp",
+      "task": "develop-cast",
+      "problemMatcher": {
+        "owner": "ha-build",
+        "source": "ha-build",
+        "fileLocation": "absolute",
+        "severity": "error",
+        "pattern": [
+          {
+            "regexp": "(SyntaxError): (.+): (.+) \\((\\d+):(\\d+)\\)",
+            "severity": 1,
+            "file": 2,
+            "message": 3,
+            "line": 4,
+            "column": 5
+          }
+        ],
+        "background": {
+          "activeOnStart": true,
+          "beginsPattern": "Changes detected. Starting compilation",
+          "endsPattern": "Build done @"
+        }
+      },
+
+      "isBackground": true,
+      "group": "build",
+      "runOptions": {
+        "instanceLimit": 1
+      }
+    },
+    {
+      "label": "Run HA Core in devcontainer",
+      "type": "shell",
+      "command": "script/core",
+      "isBackground": true,
+      "group": {
+        "kind": "build",
+        "isDefault": true
+      },
+      "problemMatcher": [],
+      "runOptions": {
+        "instanceLimit": 1
+      }
+    },
+    {
+      "label": "Run HA Core for Supervisor in devcontainer",
+      "type": "shell",
+      "command": "HASSIO=${input:supervisorHost} HASSIO_TOKEN=${input:supervisorToken} script/core",
+      "isBackground": true,
+      "group": {
+        "kind": "build",
+        "isDefault": true
+      },
+      "problemMatcher": [],
+      "runOptions": {
+        "instanceLimit": 1
+      }
+    }
+  ],
+  "inputs": [
+    {
+      "id": "supervisorHost",
+      "type": "promptString",
+      "description": "The IP of the Supervisor host running the Remote API proxy add-on"
+    },
+    {
+      "id": "supervisorToken",
+      "type": "promptString",
+      "description": "The token for the Remote API proxy add-on"
+    }
+  ]
+}
@@ -0,0 +1,29 @@
+diff --git a/polyfillLoaders/EventTarget.js b/polyfillLoaders/EventTarget.js
+index 4e18ade7ba485849f17f28c94c42f0e0e01ac387..8f34f4f646c7f7becc208fb5a546c96034fc74dc 100644
+--- a/polyfillLoaders/EventTarget.js
+++ b/polyfillLoaders/EventTarget.js
+@@ -6,16 +6,15 @@
+ let _ET;
+ let ET;
+ export default async function EventTarget() {
+-    return ET || init();
+  return ET || init();
+ }
+ async function init() {
+-    _ET = window.EventTarget;
+-    try {
+-        new _ET();
+-    }
+-    catch (_a) {
+-        _ET = (await import('event-target-shim')).EventTarget;
+-    }
+-    return (ET = _ET);
+  _ET = window.EventTarget;
+  try {
+    new _ET();
+  } catch (_a) {
+    _ET = (await import("event-target-shim")).default.EventTarget;
+  }
+  return (ET = _ET);
+ }
+ //# sourceMappingURL=EventTarget.js.map
@@ -0,0 +1,12 @@
+diff --git a/mwc-icon-button-base.js b/mwc-icon-button-base.js
+index 45cdaab93ccc0a6daaaaabc01266dcdc32e46bfd..b3ea5b541597308d85f86ce6c23fd00785fda835 100644
+--- a/mwc-icon-button-base.js
+++ b/mwc-icon-button-base.js
+@@ -63,7 +63,6 @@ export class IconButtonBase extends LitElement {
+         @touchend="${this.handleRippleDeactivate}"
+         @touchcancel="${this.handleRippleDeactivate}"
+     >${this.renderRipple()}
+-    <i class="material-icons">${this.icon}</i>
+     <span
+       ><slot></slot
+     ></span>
@@ -0,0 +1,34 @@
+diff --git a/lib/legacy/class.js b/lib/legacy/class.js
+index aee2511be1cd9bf900ee552bc98190c1631c57c0..f2f499d68bf52034cac9c28307c99e8ce6b8417d 100644
+--- a/lib/legacy/class.js
+++ b/lib/legacy/class.js
+@@ -304,17 +304,23 @@ function GenerateClassFromInfo(info, Base, behaviors) {
+       // only proceed if the generated class' prototype has not been registered.
+       const generatedProto = PolymerGenerated.prototype;
+       if (!generatedProto.hasOwnProperty(JSCompiler_renameProperty('__hasRegisterFinished', generatedProto))) {
+-        generatedProto.__hasRegisterFinished = true;
+        // make sure legacy lifecycle is called on the *element*'s prototype
+        // and not the generated class prototype; if the element has been
+        // extended, these are *not* the same.
+        const proto = Object.getPrototypeOf(this);
+        // Only set flag when generated prototype itself is registered,
+        // as this element may be extended from, and needs to run `registered`
+        // on all behaviors on the subclass as well.
+        if (proto === generatedProto) {
+          generatedProto.__hasRegisterFinished = true;
+        }
+         // ensure superclass is registered first.
+         super._registered();
+         // copy properties onto the generated class lazily if we're optimizing,
+-        if (legacyOptimizations) {
+        if (legacyOptimizations && !Object.hasOwnProperty(generatedProto, '__hasCopiedProperties')) {
+          generatedProto.__hasCopiedProperties = true;
+           copyPropertiesToProto(generatedProto);
+         }
+-        // make sure legacy lifecycle is called on the *element*'s prototype
+-        // and not the generated class prototype; if the element has been
+-        // extended, these are *not* the same.
+-        const proto = Object.getPrototypeOf(this);
+         let list = lifecycle.beforeRegister;
+         if (list) {
+           for (let i=0; i < list.length; i++) {
@@ -0,0 +1,9 @@
+nodeLinker: node-modules
+
+plugins:
+  - path: .yarn/plugins/@yarnpkg/plugin-typescript.cjs
+    spec: "@yarnpkg/plugin-typescript"
+  - path: .yarn/plugins/@yarnpkg/plugin-interactive-tools.cjs
+    spec: "@yarnpkg/plugin-interactive-tools"
+
+yarnPath: .yarn/releases/yarn-3.0.2.cjs
@@ -2,79 +2,139 @@

 ## Our Pledge

-In the interest of fostering an open and welcoming environment, we as
-contributors and maintainers pledge to making participation in our project and
-our community a harassment-free experience for everyone, regardless of age, body
-size, disability, ethnicity, gender identity and expression, level of experience,
-nationality, personal appearance, race, religion, or sexual identity and
-orientation.
+We as members, contributors, and leaders pledge to make participation in our
+community a harassment-free experience for everyone, regardless of age, body
+size, visible or invisible disability, ethnicity, sex characteristics, gender
+identity and expression, level of experience, education, socio-economic status,
+nationality, personal appearance, race, religion, or sexual identity
+and orientation.
+
+We pledge to act and interact in ways that contribute to an open, welcoming,
+diverse, inclusive, and healthy community.

 ## Our Standards

-Examples of behavior that contributes to creating a positive environment
-include:
+Examples of behavior that contributes to a positive environment for our
+community include:

-* Using welcoming and inclusive language
-* Being respectful of differing viewpoints and experiences
-* Gracefully accepting constructive criticism
-* Focusing on what is best for the community
-* Showing empathy towards other community members
+* Demonstrating empathy and kindness toward other people
+* Being respectful of differing opinions, viewpoints, and experiences
+* Giving and gracefully accepting constructive feedback
+* Accepting responsibility and apologizing to those affected by our mistakes,
+  and learning from the experience
+* Focusing on what is best not just for us as individuals, but for the
+  overall community

-Examples of unacceptable behavior by participants include:
+Examples of unacceptable behavior include:

-* The use of sexualized language or imagery and unwelcome sexual attention or
-advances
-* Trolling, insulting/derogatory comments, and personal or political attacks
+* The use of sexualized language or imagery, and sexual attention or
+  advances of any kind
+* Trolling, insulting or derogatory comments, and personal or political attacks
 * Public or private harassment
-* Publishing others' private information, such as a physical or electronic
-  address, without explicit permission
+* Publishing others' private information, such as a physical or email
+  address, without their explicit permission
 * Other conduct which could reasonably be considered inappropriate in a
  professional setting

-## Our Responsibilities
+## Enforcement Responsibilities

-Project maintainers are responsible for clarifying the standards of acceptable
-behavior and are expected to take appropriate and fair corrective action in
-response to any instances of unacceptable behavior.
+Community leaders are responsible for clarifying and enforcing our standards of
+acceptable behavior and will take appropriate and fair corrective action in
+response to any behavior that they deem inappropriate, threatening, offensive,
+or harmful.

-Project maintainers have the right and responsibility to remove, edit, or
-reject comments, commits, code, wiki edits, issues, and other contributions
-that are not aligned to this Code of Conduct, or to ban temporarily or
-permanently any contributor for other behaviors that they deem inappropriate,
-threatening, offensive, or harmful.
+Community leaders have the right and responsibility to remove, edit, or reject
+comments, commits, code, wiki edits, issues, and other contributions that are
+not aligned to this Code of Conduct, and will communicate reasons for moderation
+decisions when appropriate.

 ## Scope

-This Code of Conduct applies both within project spaces and in public spaces
-when an individual is representing the project or its community. Examples of
-representing a project or community include using an official project e-mail
-address, posting via an official social media account, or acting as an appointed
-representative at an online or offline event. Representation of a project may be
-further defined and clarified by project maintainers.
+This Code of Conduct applies within all community spaces, and also applies when
+an individual is officially representing the community in public spaces.
+Examples of representing our community include using an official e-mail address,
+posting via an official social media account, or acting as an appointed
+representative at an online or offline event.

 ## Enforcement

 Instances of abusive, harassing, or otherwise unacceptable behavior may be
-reported by contacting the project team at [safety@home-assistant.io][email]. All
-complaints will be reviewed and investigated and will result in a response that
-is deemed necessary and appropriate to the circumstances. The project team is
-obligated to maintain confidentiality with regard to the reporter of an incident.
-Further details of specific enforcement policies may be posted separately.
+reported to the community leaders responsible for enforcement at
+[safety@home-assistant.io][email] or by using the report/flag feature of
+the medium used. All complaints will be reviewed and investigated promptly and
+fairly.

-Project maintainers who do not follow or enforce the Code of Conduct in good
-faith may face temporary or permanent repercussions as determined by other
-members of the project's leadership.
+All community leaders are obligated to respect the privacy and security of the
+reporter of any incident.
+
+## Enforcement Guidelines
+
+Community leaders will follow these Community Impact Guidelines in determining
+the consequences for any action they deem in violation of this Code of Conduct:
+
+### 1. Correction
+
+**Community Impact**: Use of inappropriate language or other behavior deemed
+unprofessional or unwelcome in the community.
+
+**Consequence**: A private, written warning from community leaders, providing
+clarity around the nature of the violation and an explanation of why the
+behavior was inappropriate. A public apology may be requested.
+
+### 2. Warning
+
+**Community Impact**: A violation through a single incident or series
+of actions.
+
+**Consequence**: A warning with consequences for continued behavior. No
+interaction with the people involved, including unsolicited interaction with
+those enforcing the Code of Conduct, for a specified period of time. This
+includes avoiding interactions in community spaces as well as external channels
+like social media. Violating these terms may lead to a temporary or
+permanent ban.
+
+### 3. Temporary Ban
+
+**Community Impact**: A serious violation of community standards, including
+sustained inappropriate behavior.
+
+**Consequence**: A temporary ban from any sort of interaction or public
+communication with the community for a specified period of time. No public or
+private interaction with the people involved, including unsolicited interaction
+with those enforcing the Code of Conduct, is allowed during this period.
+Violating these terms may lead to a permanent ban.
+
+### 4. Permanent Ban
+
+**Community Impact**: Demonstrating a pattern of violation of community
+standards, including sustained inappropriate behavior,  harassment of an
+individual, or aggression toward or disparagement of classes of individuals.
+
+**Consequence**: A permanent ban from any sort of public interaction within
+the community.

 ## Attribution

-This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
-available [here][version].
+This Code of Conduct is adapted from the [Contributor Covenant][homepage],
+version 2.0, available [here][version].
+
+Community Impact Guidelines were inspired by [Mozilla's code of conduct
+enforcement ladder][mozilla].

 ## Adoption

-This Code of Conduct was first adopted January 21st, 2017 and announced in [this][coc-blog] blog post.
+This Code of Conduct was first adopted January 21st, 2017 and announced in
+[this][coc-blog] blog post and has been updated on May 25th, 2020 to version
+2.0 of the [Contributor Covenant][homepage] as announced in [this][coc2-blog]
+blog post.

-[homepage]: http://contributor-covenant.org
-[version]: http://contributor-covenant.org/version/1/4/
+For answers to common questions about this code of conduct, see the FAQ at
+<https://www.contributor-covenant.org/faq>. Translations are available at
+<https://www.contributor-covenant.org/translations>.
+
+[coc-blog]: /blog/2017/01/21/home-assistant-governance/
+[coc2-blog]: /blog/2020/05/25/code-of-conduct-updated/
 [email]: mailto:safety@home-assistant.io
-[coc-blog]: https://home-assistant.io/blog/2017/01/21/home-assistant-governance/
+[homepage]: http://contributor-covenant.org
+[mozilla]: https://github.com/mozilla/diversity
+[version]: https://www.contributor-covenant.org/version/2/0/code_of_conduct.html
@@ -1,31 +0,0 @@
-FROM node:8.11.1-alpine
-
-# install yarn
-ENV PATH /root/.yarn/bin:$PATH
-
-## Install/force base tools
-RUN apk update \
-  && apk add make g++ curl bash binutils tar git python2 python3 \
-  && rm -rf /var/cache/apk/* \
-  && /bin/bash \
-  && touch ~/.bashrc
-
-## Install yarn
-RUN curl -o- -L https://yarnpkg.com/install.sh | bash
-
-## Setup the project
-RUN mkdir -p /frontend
-
-WORKDIR /frontend
-
-COPY package.json yarn.lock ./
-
-RUN yarn install --frozen-lockfile
-
-COPY . .
-
-COPY script/docker_entrypoint.sh /usr/bin/docker_entrypoint.sh
-
-RUN chmod +x /usr/bin/docker_entrypoint.sh
-
-CMD [ "docker_entrypoint.sh" ]
@@ -1,5 +1,4 @@
 include README.md
-include LICENSE.md
 graft hass_frontend
 graft hass_frontend_es5
 recursive-exclude * *.py[co]
@@ -1,33 +1,29 @@
-# Home Assistant Polymer [![Build Status](https://travis-ci.org/home-assistant/home-assistant-polymer.svg?branch=master)](https://travis-ci.org/home-assistant/home-assistant-polymer)
+# Home Assistant Frontend

 This is the repository for the official [Home Assistant](https://home-assistant.io) frontend.

-[![Screenshot of the frontend](https://raw.githubusercontent.com/home-assistant/home-assistant-polymer/master/docs/screenshot.png)](https://home-assistant.io/demo/)
+[![Screenshot of the frontend](https://raw.githubusercontent.com/home-assistant/home-assistant-polymer/master/docs/screenshot.png)](https://demo.home-assistant.io/)

- [View demo of the Polymer frontend](https://home-assistant.io/demo/)
+- [View demo of Home Assistant](https://demo.home-assistant.io/)
 - [More information about Home Assistant](https://home-assistant.io)
- [Frontend development instructions](https://developers.home-assistant.io/docs/en/frontend_index.html)
+- [Frontend development instructions](https://developers.home-assistant.io/docs/frontend/development/)

 ## Development

 - Initial setup: `script/setup`
- Development: [Instructions](https://developers.home-assistant.io/docs/en/frontend_development.html)
+- Development: [Instructions](https://developers.home-assistant.io/docs/frontend/development/)
 - Production build: `script/build_frontend`
 - Gallery: `cd gallery && script/develop_gallery`
- Hass.io: [Instructions](https://developers.home-assistant.io/docs/en/hassio_hass.html)
+- Supervisor: [Instructions](https://developers.home-assistant.io/docs/supervisor/developing)

 ## Frontend development

 ### Classic environment
+
 A complete guide can be found at the following [link](https://www.home-assistant.io/developers/frontend/). It describes a short guide for the build of project.

-### Docker environment
-It is possible to compile the project and/or run commands in the development environment having only the [Docker](https://www.docker.com) pre-installed in the system. On the root of project you can do:
-* `sh ./script/docker_run.sh build` Build all the project with one command
-* `sh ./script/docker_run.sh bash` Open an interactive shell (the same environment generated by the *classic environment*) where you can run commands. This bash work on your project directory and any change on your file is automatically present within your build bash.
-
-**Note**: if you have installed `npm` in addition to the `docker`, you can use the commands `npm run docker_build` and `npm run bash` to get a full build or bash as explained above
-
 ## License

 Home Assistant is open-source and Apache 2 licensed. Feel free to browse the repository, learn and reuse parts in your own projects.
+
+We use [BrowserStack](https://www.browserstack.com) to test Home Assistant on a large variety of devices.
@@ -1,64 +0,0 @@
-# https://dev.azure.com/home-assistant
-
-trigger:
-  batch: true
-  tags:
-    include:
-      - "*"
-pr: none
-variables:
-  - name: versionWheels
-    value: '1.3-3.7-alpine3.10'
-  - name: versionNode
-    value: '12.1'
-  - group: twine
-resources:
-  repositories:
-    - repository: azure
-      type: github
-      name: 'home-assistant/ci-azure'
-      endpoint: 'home-assistant'
-
-
-stages:
-  - stage: "Validate"
-    jobs:
-    - template: templates/azp-job-version.yaml@azure
-
-  - stage: "Build"
-    jobs:
-      - job: "ReleasePython"
-        pool:
-          vmImage: "ubuntu-latest"
-        steps:
-          - task: UsePythonVersion@0
-            displayName: "Use Python 3.7"
-            inputs:
-              versionSpec: "3.7"
-          - task: NodeTool@0
-            displayName: "Use Node $(versionNode)"
-            inputs:
-              versionSpec: "$(versionNode)"
-          - script: pip install twine wheel
-            displayName: "Install tools"
-          - script: |
-              export TWINE_USERNAME="$(twineUser)"
-              export TWINE_PASSWORD="$(twinePassword)"
-
-              script/release
-            displayName: "Build and release package"
-      - template: templates/azp-job-wheels.yaml@azure
-        parameters:
-          builderVersion: '$(versionWheels)'
-          builderApk: 'build-base'
-          wheelsLocal: true
-          preBuild:
-          - task: NodeTool@0
-            displayName: "Use Node $(versionNode)"
-            inputs:
-              versionSpec: "$(versionNode)"
-          - script: |
-              set -e
-
-              yarn install
-              script/build_frontend
@@ -0,0 +1,39 @@
+# Bundling Home Assistant Frontend
+
+The Home Assistant build pipeline contains various steps to prepare a build.
+
+- Generating icon files to be included
+- Generating translation files to be included
+- Converting TypeScript, CSS and JSON files to JavaScript
+- Bundling
+- Minifying the files
+- Generating the HTML entrypoint files
+- Generating the service worker
+- Compressing the files
+
+## Converting files
+
+Currently in Home Assistant we use a bundler to convert TypeScript, CSS and JSON files to JavaScript files that the browser understands.
+
+We currently rely on Webpack but also have experimental Rollup support. Both of these programs bundle the converted files in both production and development.
+
+For development, bundling is optional. We just want to get the right files in the browser.
+
+Responsibilities of the converter during development:
+
+- Convert TypeScript to JavaScript
+- Convert CSS to JavaScript that sets the content as the default export
+- Convert JSON to JavaScript that sets the content as the default export
+- Make sure import, dynamic import and web worker references work
+  - Add extensions where missing
+  - Resolve absolute package imports
+- Filter out specific imports/packages
+- Replace constants with values
+
+In production, the following responsibilities are added:
+
+- Minify HTML
+- Bundle multiple imports so that the browser can fetch less files
+- Generate a second version that is ES5 compatible
+
+Configuration for all these steps are specified in [bundle.js](bundle.js).
@@ -0,0 +1,170 @@
+/* eslint-disable @typescript-eslint/no-var-requires */
+const path = require("path");
+
+// Currently only supports CommonJS modules, as require is synchronous. `import` would need babel running asynchronous.
+module.exports = function inlineConstants(babel, options, cwd) {
+  const t = babel.types;
+
+  if (!Array.isArray(options.modules)) {
+    throw new TypeError(
+      "babel-plugin-inline-constants: expected a `modules` array to be passed"
+    );
+  }
+
+  if (options.resolveExtensions && !Array.isArray(options.resolveExtensions)) {
+    throw new TypeError(
+      "babel-plugin-inline-constants: expected `resolveExtensions` to be an array"
+    );
+  }
+
+  const ignoreModuleNotFound = options.ignoreModuleNotFound;
+  const resolveExtensions = options.resolveExtensions;
+
+  const hasRelativeModules = options.modules.some(
+    (module) => module.startsWith(".") || module.startsWith("/")
+  );
+
+  const modules = Object.fromEntries(
+    options.modules.map((module) => {
+      const absolute = module.startsWith(".")
+        ? require.resolve(module, { paths: [cwd] })
+        : module;
+      // eslint-disable-next-line import/no-dynamic-require
+      return [absolute, require(absolute)];
+    })
+  );
+
+  const toLiteral = (value) => {
+    if (typeof value === "string") {
+      return t.stringLiteral(value);
+    }
+
+    if (typeof value === "number") {
+      return t.numericLiteral(value);
+    }
+
+    if (typeof value === "boolean") {
+      return t.booleanLiteral(value);
+    }
+
+    if (value === null) {
+      return t.nullLiteral();
+    }
+
+    throw new Error(
+      "babel-plugin-inline-constants: cannot handle non-literal `" + value + "`"
+    );
+  };
+
+  const resolveAbsolute = (value, state, resolveExtensionIndex) => {
+    if (!state.filename) {
+      throw new TypeError(
+        "babel-plugin-inline-constants: expected a `filename` to be set for files"
+      );
+    }
+
+    if (resolveExtensions && resolveExtensionIndex !== undefined) {
+      value += resolveExtensions[resolveExtensionIndex];
+    }
+
+    try {
+      return require.resolve(value, { paths: [path.dirname(state.filename)] });
+    } catch (error) {
+      if (
+        error.code === "MODULE_NOT_FOUND" &&
+        resolveExtensions &&
+        (resolveExtensionIndex === undefined ||
+          resolveExtensionIndex < resolveExtensions.length - 1)
+      ) {
+        const resolveExtensionIdx = (resolveExtensionIndex || -1) + 1;
+        return resolveAbsolute(value, state, resolveExtensionIdx);
+      }
+
+      if (error.code === "MODULE_NOT_FOUND" && ignoreModuleNotFound) {
+        return undefined;
+      }
+      throw error;
+    }
+  };
+
+  const importDeclaration = (p, state) => {
+    if (p.node.type !== "ImportDeclaration") {
+      return;
+    }
+    const absolute =
+      hasRelativeModules && p.node.source.value.startsWith(".")
+        ? resolveAbsolute(p.node.source.value, state)
+        : p.node.source.value;
+
+    if (!absolute || !(absolute in modules)) {
+      return;
+    }
+
+    const module = modules[absolute];
+
+    for (const specifier of p.node.specifiers) {
+      if (
+        specifier.type === "ImportDefaultSpecifier" &&
+        specifier.local &&
+        specifier.local.type === "Identifier"
+      ) {
+        if (!("default" in module)) {
+          throw new Error(
+            "babel-plugin-inline-constants: cannot access default export from `" +
+              p.node.source.value +
+              "`"
+          );
+        }
+
+        const variableValue = toLiteral(module.default);
+        const variable = t.variableDeclarator(
+          t.identifier(specifier.local.name),
+          variableValue
+        );
+
+        p.insertBefore({
+          type: "VariableDeclaration",
+          kind: "const",
+          declarations: [variable],
+        });
+      } else if (
+        specifier.type === "ImportSpecifier" &&
+        specifier.imported &&
+        specifier.imported.type === "Identifier" &&
+        specifier.local &&
+        specifier.local.type === "Identifier"
+      ) {
+        if (!(specifier.imported.name in module)) {
+          throw new Error(
+            "babel-plugin-inline-constants: cannot access `" +
+              specifier.imported.name +
+              "` from `" +
+              p.node.source.value +
+              "`"
+          );
+        }
+
+        const variableValue = toLiteral(module[specifier.imported.name]);
+        const variable = t.variableDeclarator(
+          t.identifier(specifier.local.name),
+          variableValue
+        );
+
+        p.insertBefore({
+          type: "VariableDeclaration",
+          kind: "const",
+          declarations: [variable],
+        });
+      } else {
+        throw new Error("Cannot handle specifier `" + specifier.type + "`");
+      }
+    }
+    p.remove();
+  };
+
+  return {
+    visitor: {
+      ImportDeclaration: importDeclaration,
+    },
+  };
+};
@@ -1,48 +0,0 @@
-module.exports.babelLoaderConfig = ({ latestBuild }) => {
-  if (latestBuild === undefined) {
-    throw Error("latestBuild not defined for babel loader config");
-  }
-  return {
-    test: /\.m?js$|\.tsx?$/,
-    use: {
-      loader: "babel-loader",
-      options: {
-        presets: [
-          !latestBuild && [
-            require("@babel/preset-env").default,
-            { modules: false },
-          ],
-          [
-            require("@babel/preset-typescript").default,
-            {
-              jsxPragma: "h",
-            },
-          ],
-        ].filter(Boolean),
-        plugins: [
-          // Part of ES2018. Converts {...a, b: 2} to Object.assign({}, a, {b: 2})
-          [
-            "@babel/plugin-proposal-object-rest-spread",
-            { loose: true, useBuiltIns: true },
-          ],
-          // Only support the syntax, Webpack will handle it.
-          "@babel/syntax-dynamic-import",
-          [
-            "@babel/transform-react-jsx",
-            {
-              pragma: "h",
-            },
-          ],
-          [
-            require("@babel/plugin-proposal-decorators").default,
-            { decoratorsBeforeExport: true },
-          ],
-          [
-            require("@babel/plugin-proposal-class-properties").default,
-            { loose: true },
-          ],
-        ],
-      },
-    },
-  };
-};
@@ -0,0 +1,225 @@
+/* eslint-disable @typescript-eslint/no-var-requires */
+const path = require("path");
+const env = require("./env.js");
+const paths = require("./paths.js");
+
+// Files from NPM Packages that should not be imported
+module.exports.ignorePackages = ({ latestBuild }) => [
+  // Part of yaml.js and only used for !!js functions that we don't use
+  require.resolve("esprima"),
+];
+
+// Files from NPM packages that we should replace with empty file
+module.exports.emptyPackages = ({ latestBuild, isHassioBuild }) =>
+  [
+    // Contains all color definitions for all material color sets.
+    // We don't use it
+    require.resolve("@polymer/paper-styles/color.js"),
+    require.resolve("@polymer/paper-styles/default-theme.js"),
+    // Loads stuff from a CDN
+    require.resolve("@polymer/font-roboto/roboto.js"),
+    require.resolve("@vaadin/vaadin-material-styles/typography.js"),
+    require.resolve("@vaadin/vaadin-material-styles/font-icons.js"),
+    // Compatibility not needed for latest builds
+    latestBuild &&
+      // wrapped in require.resolve so it blows up if file no longer exists
+      require.resolve(
+        path.resolve(paths.polymer_dir, "src/resources/compatibility.ts")
+      ),
+    // This polyfill is loaded in workers to support ES5, filter it out.
+    latestBuild && require.resolve("proxy-polyfill/src/index.js"),
+    // Icons in supervisor conflict with icons in HA so we don't load.
+    isHassioBuild &&
+      require.resolve(
+        path.resolve(paths.polymer_dir, "src/components/ha-icon.ts")
+      ),
+  ].filter(Boolean);
+
+module.exports.definedVars = ({ isProdBuild, latestBuild, defineOverlay }) => ({
+  __DEV__: !isProdBuild,
+  __BUILD__: JSON.stringify(latestBuild ? "latest" : "es5"),
+  __VERSION__: JSON.stringify(env.version()),
+  __DEMO__: false,
+  __SUPERVISOR__: false,
+  __BACKWARDS_COMPAT__: false,
+  __STATIC_PATH__: "/static/",
+  "process.env.NODE_ENV": JSON.stringify(
+    isProdBuild ? "production" : "development"
+  ),
+  ...defineOverlay,
+});
+
+module.exports.terserOptions = (latestBuild) => ({
+  safari10: !latestBuild,
+  ecma: latestBuild ? undefined : 5,
+  output: { comments: false },
+});
+
+module.exports.babelOptions = ({ latestBuild }) => ({
+  babelrc: false,
+  compact: false,
+  presets: [
+    !latestBuild && [
+      "@babel/preset-env",
+      {
+        useBuiltIns: "entry",
+        corejs: "3.15",
+        bugfixes: true,
+      },
+    ],
+    "@babel/preset-typescript",
+  ].filter(Boolean),
+  plugins: [
+    [
+      path.resolve(
+        paths.polymer_dir,
+        "build-scripts/babel-plugins/inline-constants-plugin.js"
+      ),
+      {
+        modules: ["@mdi/js"],
+        ignoreModuleNotFound: true,
+      },
+    ],
+    // Part of ES2018. Converts {...a, b: 2} to Object.assign({}, a, {b: 2})
+    !latestBuild && [
+      "@babel/plugin-proposal-object-rest-spread",
+      { loose: true, useBuiltIns: true },
+    ],
+    // Only support the syntax, Webpack will handle it.
+    "@babel/plugin-syntax-import-meta",
+    "@babel/plugin-syntax-dynamic-import",
+    "@babel/plugin-syntax-top-level-await",
+    "@babel/plugin-proposal-optional-chaining",
+    "@babel/plugin-proposal-nullish-coalescing-operator",
+    ["@babel/plugin-proposal-decorators", { decoratorsBeforeExport: true }],
+    ["@babel/plugin-proposal-private-methods", { loose: true }],
+    ["@babel/plugin-proposal-private-property-in-object", { loose: true }],
+    ["@babel/plugin-proposal-class-properties", { loose: true }],
+  ].filter(Boolean),
+  exclude: [
+    // \\ for Windows, / for Mac OS and Linux
+    /node_modules[\\/]core-js/,
+    /node_modules[\\/]webpack[\\/]buildin/,
+  ],
+});
+
+const outputPath = (outputRoot, latestBuild) =>
+  path.resolve(outputRoot, latestBuild ? "frontend_latest" : "frontend_es5");
+
+const publicPath = (latestBuild, root = "") =>
+  latestBuild ? `${root}/frontend_latest/` : `${root}/frontend_es5/`;
+
+/*
+BundleConfig {
+  // Object with entrypoints that need to be bundled
+  entry: { [name: string]: pathToFile },
+  // Folder where bundled files need to be written
+  outputPath: string,
+  // absolute url-path where bundled files can be found
+  publicPath: string,
+  // extra definitions that we need to replace in source
+  defineOverlay: {[name: string]: value },
+  // if this is a production build
+  isProdBuild: boolean,
+  // If we're targeting latest browsers
+  latestBuild: boolean,
+  // If we're doing a stats build (create nice chunk names)
+  isStatsBuild: boolean,
+  // Names of entrypoints that should not be hashed
+  dontHash: Set<string>
+}
+*/
+
+module.exports.config = {
+  app({ isProdBuild, latestBuild, isStatsBuild, isWDS }) {
+    return {
+      entry: {
+        service_worker: "./src/entrypoints/service_worker.ts",
+        app: "./src/entrypoints/app.ts",
+        authorize: "./src/entrypoints/authorize.ts",
+        onboarding: "./src/entrypoints/onboarding.ts",
+        core: "./src/entrypoints/core.ts",
+        "custom-panel": "./src/entrypoints/custom-panel.ts",
+      },
+      outputPath: outputPath(paths.app_output_root, latestBuild),
+      publicPath: publicPath(latestBuild),
+      isProdBuild,
+      latestBuild,
+      isStatsBuild,
+      isWDS,
+    };
+  },
+
+  demo({ isProdBuild, latestBuild, isStatsBuild }) {
+    return {
+      entry: {
+        main: path.resolve(paths.demo_dir, "src/entrypoint.ts"),
+      },
+      outputPath: outputPath(paths.demo_output_root, latestBuild),
+      publicPath: publicPath(latestBuild),
+      defineOverlay: {
+        __VERSION__: JSON.stringify(`DEMO-${env.version()}`),
+        __DEMO__: true,
+      },
+      isProdBuild,
+      latestBuild,
+      isStatsBuild,
+    };
+  },
+
+  cast({ isProdBuild, latestBuild }) {
+    const entry = {
+      launcher: path.resolve(paths.cast_dir, "src/launcher/entrypoint.ts"),
+      media: path.resolve(paths.cast_dir, "src/media/entrypoint.ts"),
+    };
+
+    if (latestBuild) {
+      entry.receiver = path.resolve(
+        paths.cast_dir,
+        "src/receiver/entrypoint.ts"
+      );
+    }
+
+    return {
+      entry,
+      outputPath: outputPath(paths.cast_output_root, latestBuild),
+      publicPath: publicPath(latestBuild),
+      isProdBuild,
+      latestBuild,
+      defineOverlay: {
+        __BACKWARDS_COMPAT__: true,
+      },
+    };
+  },
+
+  hassio({ isProdBuild, latestBuild }) {
+    return {
+      entry: {
+        entrypoint: path.resolve(paths.hassio_dir, "src/entrypoint.ts"),
+      },
+      outputPath: outputPath(paths.hassio_output_root, latestBuild),
+      publicPath: publicPath(latestBuild, paths.hassio_publicPath),
+      isProdBuild,
+      latestBuild,
+      isHassioBuild: true,
+      defineOverlay: {
+        __SUPERVISOR__: true,
+      },
+    };
+  },
+
+  gallery({ isProdBuild, latestBuild }) {
+    return {
+      entry: {
+        entrypoint: path.resolve(paths.gallery_dir, "src/entrypoint.js"),
+      },
+      outputPath: outputPath(paths.gallery_output_root, latestBuild),
+      publicPath: publicPath(latestBuild),
+      isProdBuild,
+      latestBuild,
+      defineOverlay: {
+        __DEMO__: true,
+      },
+    };
+  },
+};
@@ -1,6 +1,36 @@
+/* eslint-disable @typescript-eslint/no-var-requires */
+const fs = require("fs");
+const path = require("path");
+const paths = require("./paths.js");
+
 module.exports = {
-  isProdBuild: process.env.NODE_ENV === "production",
-  isStatsBuild: process.env.STATS === "1",
-  isTravis: process.env.TRAVIS === "true",
-  isNetlify: process.env.NETLIFY === "true",
+  useRollup() {
+    return process.env.ROLLUP === "1";
+  },
+  useWDS() {
+    return process.env.WDS === "1";
+  },
+  isProdBuild() {
+    return (
+      process.env.NODE_ENV === "production" || module.exports.isStatsBuild()
+    );
+  },
+  isStatsBuild() {
+    return process.env.STATS === "1";
+  },
+  isTest() {
+    return process.env.IS_TEST === "true";
+  },
+  isNetlify() {
+    return process.env.NETLIFY === "true";
+  },
+  version() {
+    const version = fs
+      .readFileSync(path.resolve(paths.polymer_dir, "setup.cfg"), "utf8")
+      .match(/version\W+=\W(\d{8}\.\d)/);
+    if (!version) {
+      throw Error("Version not found");
+    }
+    return version[1];
+  },
 };
@@ -1,16 +1,19 @@
 // Run HA develop mode
 const gulp = require("gulp");

-const envVars = require("../env");
+const env = require("../env");

 require("./clean.js");
 require("./translations.js");
-require("./gen-icons.js");
+require("./locale-data.js");
+require("./gen-icons-json.js");
 require("./gather-static.js");
 require("./compress.js");
 require("./webpack.js");
 require("./service-worker.js");
 require("./entry-html.js");
+require("./rollup.js");
+require("./wds.js");

 gulp.task(
  "develop-app",
@@ -20,14 +23,19 @@ gulp.task(
    },
    "clean",
    gulp.parallel(
-      "gen-service-worker-dev",
-      gulp.parallel("gen-icons-app", "gen-icons-mdi"),
+      "gen-service-worker-app-dev",
+      "gen-icons-json",
      "gen-pages-dev",
      "gen-index-app-dev",
-      gulp.series("create-test-translation", "build-translations")
+      "build-translations",
+      "build-locale-data"
    ),
-    "copy-static",
-    "webpack-watch-app"
+    "copy-static-app",
+    env.useWDS()
+      ? "wds-watch-app"
+      : env.useRollup()
+      ? "rollup-watch-app"
+      : "webpack-watch-app"
  )
 );

@@ -38,15 +46,15 @@ gulp.task(
      process.env.NODE_ENV = "production";
    },
    "clean",
-    gulp.parallel("gen-icons-app", "gen-icons-mdi", "build-translations"),
-    "copy-static",
-    "webpack-prod-app",
-    ...// Don't compress running tests
-    (envVars.isTravis ? [] : ["compress-app"]),
+    gulp.parallel("gen-icons-json", "build-translations", "build-locale-data"),
+    "copy-static-app",
+    env.useRollup() ? "rollup-prod-app" : "webpack-prod-app",
+    // Don't compress running tests
+    ...(env.isTest() ? [] : ["compress-app"]),
    gulp.parallel(
      "gen-pages-prod",
      "gen-index-app-prod",
-      "gen-service-worker-prod"
+      "gen-service-worker-app-prod"
    )
  )
 );
@@ -1,12 +1,14 @@
 const gulp = require("gulp");

+const env = require("../env");
+
 require("./clean.js");
 require("./translations.js");
-require("./gen-icons.js");
 require("./gather-static.js");
 require("./webpack.js");
 require("./service-worker.js");
 require("./entry-html.js");
+require("./rollup.js");

 gulp.task(
  "develop-cast",
@@ -15,14 +17,11 @@ gulp.task(
      process.env.NODE_ENV = "development";
    },
    "clean-cast",
-    gulp.parallel(
-      "gen-icons-app",
-      "gen-icons-mdi",
-      "gen-index-cast-dev",
-      "build-translations"
-    ),
+    "translations-enable-merge-backend",
+    gulp.parallel("gen-icons-json", "build-translations", "build-locale-data"),
    "copy-static-cast",
-    "webpack-dev-server-cast"
+    "gen-index-cast-dev",
+    env.useRollup() ? "rollup-dev-server-cast" : "webpack-dev-server-cast"
  )
 );

@@ -33,9 +32,10 @@ gulp.task(
      process.env.NODE_ENV = "production";
    },
    "clean-cast",
-    gulp.parallel("gen-icons-app", "gen-icons-mdi", "build-translations"),
+    "translations-enable-merge-backend",
+    gulp.parallel("gen-icons-json", "build-translations", "build-locale-data"),
    "copy-static-cast",
-    "webpack-prod-cast",
+    env.useRollup() ? "rollup-prod-cast" : "webpack-prod-cast",
    "gen-index-cast-prod"
  )
 );
@@ -1,39 +1,36 @@
 const del = require("del");
 const gulp = require("gulp");
-const config = require("../paths");
+const paths = require("../paths");
 require("./translations");

 gulp.task(
  "clean",
-  gulp.parallel("clean-translations", function cleanOutputAndBuildDir() {
-    return del([config.root, config.build_dir]);
-  })
+  gulp.parallel("clean-translations", () =>
+    del([paths.app_output_root, paths.build_dir])
+  )
 );

 gulp.task(
  "clean-demo",
-  gulp.parallel("clean-translations", function cleanOutputAndBuildDir() {
-    return del([config.demo_root, config.build_dir]);
-  })
+  gulp.parallel("clean-translations", () =>
+    del([paths.demo_output_root, paths.build_dir])
+  )
 );

 gulp.task(
  "clean-cast",
-  gulp.parallel("clean-translations", function cleanOutputAndBuildDir() {
-    return del([config.cast_root, config.build_dir]);
-  })
+  gulp.parallel("clean-translations", () =>
+    del([paths.cast_output_root, paths.build_dir])
+  )
 );

-gulp.task(
-  "clean-hassio",
-  gulp.parallel("clean-translations", function cleanOutputAndBuildDir() {
-    return del([config.hassio_root, config.build_dir]);
-  })
+gulp.task("clean-hassio", () =>
+  del([paths.hassio_output_root, paths.build_dir])
 );

 gulp.task(
  "clean-gallery",
-  gulp.parallel("clean-translations", function cleanOutputAndBuildDir() {
-    return del([config.gallery_root, config.build_dir]);
-  })
+  gulp.parallel("clean-translations", () =>
+    del([paths.gallery_output_root, paths.gallery_build, paths.build_dir])
+  )
 );
@@ -6,33 +6,40 @@ const merge = require("merge-stream");
 const path = require("path");
 const paths = require("../paths");

+const zopfliOptions = { threshold: 150 };
+
 gulp.task("compress-app", function compressApp() {
  const jsLatest = gulp
-    .src(path.resolve(paths.output, "**/*.js"))
-    .pipe(zopfli())
-    .pipe(gulp.dest(paths.output));
+    .src(path.resolve(paths.app_output_latest, "**/*.js"))
+    .pipe(zopfli(zopfliOptions))
+    .pipe(gulp.dest(paths.app_output_latest));

  const jsEs5 = gulp
-    .src(path.resolve(paths.output_es5, "**/*.js"))
-    .pipe(zopfli())
-    .pipe(gulp.dest(paths.output_es5));
+    .src(path.resolve(paths.app_output_es5, "**/*.js"))
+    .pipe(zopfli(zopfliOptions))
+    .pipe(gulp.dest(paths.app_output_es5));

  const polyfills = gulp
-    .src(path.resolve(paths.static, "polyfills/*.js"))
-    .pipe(zopfli())
-    .pipe(gulp.dest(path.resolve(paths.static, "polyfills")));
+    .src(path.resolve(paths.app_output_static, "polyfills/*.js"))
+    .pipe(zopfli(zopfliOptions))
+    .pipe(gulp.dest(path.resolve(paths.app_output_static, "polyfills")));

  const translations = gulp
-    .src(path.resolve(paths.static, "translations/*.json"))
-    .pipe(zopfli())
-    .pipe(gulp.dest(path.resolve(paths.static, "translations")));
+    .src(path.resolve(paths.app_output_static, "translations/**/*.json"))
+    .pipe(zopfli(zopfliOptions))
+    .pipe(gulp.dest(path.resolve(paths.app_output_static, "translations")));

-  return merge(jsLatest, jsEs5, polyfills, translations);
+  const icons = gulp
+    .src(path.resolve(paths.app_output_static, "mdi/*.json"))
+    .pipe(zopfli(zopfliOptions))
+    .pipe(gulp.dest(path.resolve(paths.app_output_static, "mdi")));
+
+  return merge(jsLatest, jsEs5, polyfills, translations, icons);
 });

 gulp.task("compress-hassio", function compressApp() {
  return gulp
-    .src(path.resolve(paths.hassio_root, "**/*.js"))
-    .pipe(zopfli())
-    .pipe(gulp.dest(paths.hassio_root));
+    .src(path.resolve(paths.hassio_output_root, "**/*.js"))
+    .pipe(zopfli(zopfliOptions))
+    .pipe(gulp.dest(paths.hassio_output_root));
 });
@@ -1,13 +1,16 @@
 // Run demo develop mode
 const gulp = require("gulp");

+const env = require("../env");
+
 require("./clean.js");
 require("./translations.js");
-require("./gen-icons.js");
+require("./gen-icons-json.js");
 require("./gather-static.js");
 require("./webpack.js");
 require("./service-worker.js");
 require("./entry-html.js");
+require("./rollup.js");

 gulp.task(
  "develop-demo",
@@ -16,15 +19,15 @@ gulp.task(
      process.env.NODE_ENV = "development";
    },
    "clean-demo",
+    "translations-enable-merge-backend",
    gulp.parallel(
-      "gen-icons-app",
-      "gen-icons-mdi",
-      "gen-icons-demo",
+      "gen-icons-json",
      "gen-index-demo-dev",
-      "build-translations"
+      "build-translations",
+      "build-locale-data"
    ),
    "copy-static-demo",
-    "webpack-dev-server-demo"
+    env.useRollup() ? "rollup-dev-server-demo" : "webpack-dev-server-demo"
  )
 );

@@ -35,14 +38,11 @@ gulp.task(
      process.env.NODE_ENV = "production";
    },
    "clean-demo",
-    gulp.parallel(
-      "gen-icons-app",
-      "gen-icons-mdi",
-      "gen-icons-demo",
-      "build-translations"
-    ),
+    // Cast needs to be backwards compatible and older HA has no translations
+    "translations-enable-merge-backend",
+    gulp.parallel("gen-icons-json", "build-translations", "build-locale-data"),
    "copy-static-demo",
-    "webpack-prod-demo",
+    env.useRollup() ? "rollup-prod-demo" : "webpack-prod-demo",
    "gen-index-demo-prod"
  )
 );
@@ -1,9 +1,14 @@
 const del = require("del");
 const gulp = require("gulp");
+const fs = require("fs");
 const mapStream = require("map-stream");

-const inDir = "translations";
-const downloadDir = inDir + "/downloads";
+const inDirFrontend = "translations/frontend";
+const inDirBackend = "translations/backend";
+const downloadDir = "translations/downloads";
+const srcMeta = "src/translations/translationMetadata.json";
+
+const encoding = "utf8";

 const tasks = [];

@@ -12,7 +17,7 @@ function hasHtml(data) {
 }

 function recursiveCheckHasHtml(file, data, errors, recKey) {
-  Object.keys(data).forEach(function(key) {
+  Object.keys(data).forEach(function (key) {
    if (typeof data[key] === "object") {
      const nextRecKey = recKey ? `${recKey}.${key}` : key;
      recursiveCheckHasHtml(file, data[key], errors, nextRecKey);
@@ -25,7 +30,7 @@ function recursiveCheckHasHtml(file, data, errors, recKey) {
 function checkHtml() {
  const errors = [];

-  return mapStream(function(file, cb) {
+  return mapStream(function (file, cb) {
    const content = file.contents;
    let error;
    if (content) {
@@ -42,20 +47,36 @@ function checkHtml() {
 }

 let taskName = "clean-downloaded-translations";
-gulp.task(taskName, function() {
+gulp.task(taskName, function () {
  return del([`${downloadDir}/**`]);
 });
 tasks.push(taskName);

 taskName = "check-translations-html";
-gulp.task(taskName, function() {
+gulp.task(taskName, function () {
  return gulp.src(`${downloadDir}/*.json`).pipe(checkHtml());
 });
 tasks.push(taskName);

+taskName = "check-all-files-exist";
+gulp.task(taskName, function () {
+  const file = fs.readFileSync(srcMeta, { encoding });
+  const meta = JSON.parse(file);
+  Object.keys(meta).forEach((lang) => {
+    if (!fs.existsSync(`${inDirFrontend}/${lang}.json`)) {
+      fs.writeFileSync(`${inDirFrontend}/${lang}.json`, JSON.stringify({}));
+    }
+    if (!fs.existsSync(`${inDirBackend}/${lang}.json`)) {
+      fs.writeFileSync(`${inDirBackend}/${lang}.json`, JSON.stringify({}));
+    }
+  });
+  return Promise.resolve();
+});
+tasks.push(taskName);
+
 taskName = "move-downloaded-translations";
-gulp.task(taskName, function() {
-  return gulp.src(`${downloadDir}/*.json`).pipe(gulp.dest(inDir));
+gulp.task(taskName, function () {
+  return gulp.src(`${downloadDir}/*.json`).pipe(gulp.dest(inDirFrontend));
 });
 tasks.push(taskName);

@@ -65,6 +86,7 @@ gulp.task(
  gulp.series(
    "check-translations-html",
    "move-downloaded-translations",
+    "check-all-files-exist",
    "clean-downloaded-translations"
  )
 );
@@ -6,31 +6,37 @@ const fs = require("fs-extra");
 const path = require("path");
 const template = require("lodash.template");
 const minify = require("html-minifier").minify;
-const config = require("../paths.js");
+const paths = require("../paths.js");
+const env = require("../env.js");

 const templatePath = (tpl) =>
-  path.resolve(config.polymer_dir, "src/html/", `${tpl}.html.template`);
+  path.resolve(paths.polymer_dir, "src/html/", `${tpl}.html.template`);

 const readFile = (pth) => fs.readFileSync(pth).toString();

 const renderTemplate = (pth, data = {}, pathFunc = templatePath) => {
  const compiled = template(readFile(pathFunc(pth)));
-  return compiled({ ...data, renderTemplate });
+  return compiled({
+    ...data,
+    useRollup: env.useRollup(),
+    useWDS: env.useWDS(),
+    renderTemplate,
+  });
 };

 const renderDemoTemplate = (pth, data = {}) =>
  renderTemplate(pth, data, (tpl) =>
-    path.resolve(config.demo_dir, "src/html/", `${tpl}.html.template`)
+    path.resolve(paths.demo_dir, "src/html/", `${tpl}.html.template`)
  );

 const renderCastTemplate = (pth, data = {}) =>
  renderTemplate(pth, data, (tpl) =>
-    path.resolve(config.cast_dir, "src/html/", `${tpl}.html.template`)
+    path.resolve(paths.cast_dir, "src/html/", `${tpl}.html.template`)
  );

 const renderGalleryTemplate = (pth, data = {}) =>
  renderTemplate(pth, data, (tpl) =>
-    path.resolve(config.gallery_dir, "src/html/", `${tpl}.html.template`)
+    path.resolve(paths.gallery_dir, "src/html/", `${tpl}.html.template`)
  );

 const minifyHtml = (content) =>
@@ -47,34 +53,37 @@ gulp.task("gen-pages-dev", (done) => {
  for (const page of PAGES) {
    const content = renderTemplate(page, {
      latestPageJS: `/frontend_latest/${page}.js`,
-      latestHassIconsJS: "/frontend_latest/hass-icons.js",

-      es5Compatibility: "/frontend_es5/compatibility.js",
      es5PageJS: `/frontend_es5/${page}.js`,
-      es5HassIconsJS: "/frontend_es5/hass-icons.js",
    });

-    fs.outputFileSync(path.resolve(config.root, `${page}.html`), content);
+    fs.outputFileSync(
+      path.resolve(paths.app_output_root, `${page}.html`),
+      content
+    );
  }
  done();
 });

 gulp.task("gen-pages-prod", (done) => {
-  const latestManifest = require(path.resolve(config.output, "manifest.json"));
-  const es5Manifest = require(path.resolve(config.output_es5, "manifest.json"));
+  const latestManifest = require(path.resolve(
+    paths.app_output_latest,
+    "manifest.json"
+  ));
+  const es5Manifest = require(path.resolve(
+    paths.app_output_es5,
+    "manifest.json"
+  ));

  for (const page of PAGES) {
    const content = renderTemplate(page, {
      latestPageJS: latestManifest[`${page}.js`],
-      latestHassIconsJS: latestManifest["hass-icons.js"],

-      es5Compatibility: es5Manifest["compatibility.js"],
      es5PageJS: es5Manifest[`${page}.js`],
-      es5HassIconsJS: es5Manifest["hass-icons.js"],
    });

    fs.outputFileSync(
-      path.resolve(config.root, `${page}.html`),
+      path.resolve(paths.app_output_root, `${page}.html`),
      minifyHtml(content)
    );
  }
@@ -82,43 +91,57 @@ gulp.task("gen-pages-prod", (done) => {
 });

 gulp.task("gen-index-app-dev", (done) => {
-  // In dev mode we don't mangle names, so we hardcode urls. That way we can
-  // run webpack as last in watch mode, which blocks output.
-  const content = renderTemplate("index", {
-    latestAppJS: "/frontend_latest/app.js",
-    latestCoreJS: "/frontend_latest/core.js",
-    latestCustomPanelJS: "/frontend_latest/custom-panel.js",
-    latestHassIconsJS: "/frontend_latest/hass-icons.js",
+  let latestAppJS, latestCoreJS, latestCustomPanelJS;
+
+  if (env.useWDS()) {
+    latestAppJS = "http://localhost:8000/src/entrypoints/app.ts";
+    latestCoreJS = "http://localhost:8000/src/entrypoints/core.ts";
+    latestCustomPanelJS =
+      "http://localhost:8000/src/entrypoints/custom-panel.ts";
+  } else {
+    latestAppJS = "/frontend_latest/app.js";
+    latestCoreJS = "/frontend_latest/core.js";
+    latestCustomPanelJS = "/frontend_latest/custom-panel.js";
+  }
+
+  const content = renderTemplate("index", {
+    latestAppJS,
+    latestCoreJS,
+    latestCustomPanelJS,

-    es5Compatibility: "/frontend_es5/compatibility.js",
    es5AppJS: "/frontend_es5/app.js",
    es5CoreJS: "/frontend_es5/core.js",
    es5CustomPanelJS: "/frontend_es5/custom-panel.js",
-    es5HassIconsJS: "/frontend_es5/hass-icons.js",
  }).replace(/#THEMEC/g, "{{ theme_color }}");

-  fs.outputFileSync(path.resolve(config.root, "index.html"), content);
+  fs.outputFileSync(path.resolve(paths.app_output_root, "index.html"), content);
  done();
 });

 gulp.task("gen-index-app-prod", (done) => {
-  const latestManifest = require(path.resolve(config.output, "manifest.json"));
-  const es5Manifest = require(path.resolve(config.output_es5, "manifest.json"));
+  const latestManifest = require(path.resolve(
+    paths.app_output_latest,
+    "manifest.json"
+  ));
+  const es5Manifest = require(path.resolve(
+    paths.app_output_es5,
+    "manifest.json"
+  ));
  const content = renderTemplate("index", {
    latestAppJS: latestManifest["app.js"],
    latestCoreJS: latestManifest["core.js"],
    latestCustomPanelJS: latestManifest["custom-panel.js"],
-    latestHassIconsJS: latestManifest["hass-icons.js"],

-    es5Compatibility: es5Manifest["compatibility.js"],
    es5AppJS: es5Manifest["app.js"],
    es5CoreJS: es5Manifest["core.js"],
    es5CustomPanelJS: es5Manifest["custom-panel.js"],
-    es5HassIconsJS: es5Manifest["hass-icons.js"],
  });
  const minified = minifyHtml(content).replace(/#THEMEC/g, "{{ theme_color }}");

-  fs.outputFileSync(path.resolve(config.root, "index.html"), minified);
+  fs.outputFileSync(
+    path.resolve(paths.app_output_root, "index.html"),
+    minified
+  );
  done();
 });

@@ -127,22 +150,34 @@ gulp.task("gen-index-cast-dev", (done) => {
    latestReceiverJS: "/frontend_latest/receiver.js",
  });
  fs.outputFileSync(
-    path.resolve(config.cast_root, "receiver.html"),
+    path.resolve(paths.cast_output_root, "receiver.html"),
    contentReceiver
  );

+  const contentMedia = renderCastTemplate("media", {
+    latestMediaJS: "/frontend_latest/media.js",
+    es5MediaJS: "/frontend_es5/media.js",
+  });
+  fs.outputFileSync(
+    path.resolve(paths.cast_output_root, "media.html"),
+    contentMedia
+  );
+
  const contentFAQ = renderCastTemplate("launcher-faq", {
    latestLauncherJS: "/frontend_latest/launcher.js",
    es5LauncherJS: "/frontend_es5/launcher.js",
  });
-  fs.outputFileSync(path.resolve(config.cast_root, "faq.html"), contentFAQ);
+  fs.outputFileSync(
+    path.resolve(paths.cast_output_root, "faq.html"),
+    contentFAQ
+  );

  const contentLauncher = renderCastTemplate("launcher", {
    latestLauncherJS: "/frontend_latest/launcher.js",
    es5LauncherJS: "/frontend_es5/launcher.js",
  });
  fs.outputFileSync(
-    path.resolve(config.cast_root, "index.html"),
+    path.resolve(paths.cast_output_root, "index.html"),
    contentLauncher
  );
  done();
@@ -150,11 +185,11 @@ gulp.task("gen-index-cast-dev", (done) => {

 gulp.task("gen-index-cast-prod", (done) => {
  const latestManifest = require(path.resolve(
-    config.cast_output,
+    paths.cast_output_latest,
    "manifest.json"
  ));
  const es5Manifest = require(path.resolve(
-    config.cast_output_es5,
+    paths.cast_output_es5,
    "manifest.json"
  ));

@@ -162,76 +197,91 @@ gulp.task("gen-index-cast-prod", (done) => {
    latestReceiverJS: latestManifest["receiver.js"],
  });
  fs.outputFileSync(
-    path.resolve(config.cast_root, "receiver.html"),
+    path.resolve(paths.cast_output_root, "receiver.html"),
    contentReceiver
  );

+  const contentMedia = renderCastTemplate("media", {
+    latestMediaJS: latestManifest["media.js"],
+    es5MediaJS: es5Manifest["media.js"],
+  });
+  fs.outputFileSync(
+    path.resolve(paths.cast_output_root, "media.html"),
+    contentMedia
+  );
+
  const contentFAQ = renderCastTemplate("launcher-faq", {
    latestLauncherJS: latestManifest["launcher.js"],
    es5LauncherJS: es5Manifest["launcher.js"],
  });
-  fs.outputFileSync(path.resolve(config.cast_root, "faq.html"), contentFAQ);
+  fs.outputFileSync(
+    path.resolve(paths.cast_output_root, "faq.html"),
+    contentFAQ
+  );

  const contentLauncher = renderCastTemplate("launcher", {
    latestLauncherJS: latestManifest["launcher.js"],
    es5LauncherJS: es5Manifest["launcher.js"],
  });
  fs.outputFileSync(
-    path.resolve(config.cast_root, "index.html"),
+    path.resolve(paths.cast_output_root, "index.html"),
    contentLauncher
  );
  done();
 });

 gulp.task("gen-index-demo-dev", (done) => {
-  // In dev mode we don't mangle names, so we hardcode urls. That way we can
-  // run webpack as last in watch mode, which blocks output.
  const content = renderDemoTemplate("index", {
    latestDemoJS: "/frontend_latest/main.js",

-    es5Compatibility: "/frontend_es5/compatibility.js",
    es5DemoJS: "/frontend_es5/main.js",
  });

-  fs.outputFileSync(path.resolve(config.demo_root, "index.html"), content);
+  fs.outputFileSync(
+    path.resolve(paths.demo_output_root, "index.html"),
+    content
+  );
  done();
 });

 gulp.task("gen-index-demo-prod", (done) => {
  const latestManifest = require(path.resolve(
-    config.demo_output,
+    paths.demo_output_latest,
    "manifest.json"
  ));
  const es5Manifest = require(path.resolve(
-    config.demo_output_es5,
+    paths.demo_output_es5,
    "manifest.json"
  ));
  const content = renderDemoTemplate("index", {
    latestDemoJS: latestManifest["main.js"],

-    es5Compatibility: es5Manifest["compatibility.js"],
    es5DemoJS: es5Manifest["main.js"],
  });
  const minified = minifyHtml(content);

-  fs.outputFileSync(path.resolve(config.demo_root, "index.html"), minified);
+  fs.outputFileSync(
+    path.resolve(paths.demo_output_root, "index.html"),
+    minified
+  );
  done();
 });

 gulp.task("gen-index-gallery-dev", (done) => {
-  // In dev mode we don't mangle names, so we hardcode urls. That way we can
-  // run webpack as last in watch mode, which blocks output.
  const content = renderGalleryTemplate("index", {
-    latestGalleryJS: "./entrypoint.js",
+    latestGalleryJS: "./frontend_latest/entrypoint.js",
  });

-  fs.outputFileSync(path.resolve(config.gallery_root, "index.html"), content);
+  fs.outputFileSync(
+    path.resolve(paths.gallery_output_root, "index.html"),
+    content
+  );
  done();
 });

 gulp.task("gen-index-gallery-prod", (done) => {
  const latestManifest = require(path.resolve(
-    config.gallery_output,
+    paths.gallery_output_latest,
    "manifest.json"
  ));
  const content = renderGalleryTemplate("index", {
@@ -239,6 +289,56 @@ gulp.task("gen-index-gallery-prod", (done) => {
  });
  const minified = minifyHtml(content);

-  fs.outputFileSync(path.resolve(config.gallery_root, "index.html"), minified);
+  fs.outputFileSync(
+    path.resolve(paths.gallery_output_root, "index.html"),
+    minified
+  );
  done();
 });
+
+gulp.task("gen-index-hassio-dev", async () => {
+  writeHassioEntrypoint(
+    `${paths.hassio_publicPath}/frontend_latest/entrypoint.js`,
+    `${paths.hassio_publicPath}/frontend_es5/entrypoint.js`
+  );
+});
+
+gulp.task("gen-index-hassio-prod", async () => {
+  const latestManifest = require(path.resolve(
+    paths.hassio_output_latest,
+    "manifest.json"
+  ));
+  const es5Manifest = require(path.resolve(
+    paths.hassio_output_es5,
+    "manifest.json"
+  ));
+  writeHassioEntrypoint(
+    latestManifest["entrypoint.js"],
+    es5Manifest["entrypoint.js"]
+  );
+});
+
+function writeHassioEntrypoint(latestEntrypoint, es5Entrypoint) {
+  fs.mkdirSync(paths.hassio_output_root, { recursive: true });
+  // Safari 12 and below does not have a compliant ES2015 implementation of template literals, so we ship ES5
+  fs.writeFileSync(
+    path.resolve(paths.hassio_output_root, "entrypoint.js"),
+    `
+function loadES5() {
+  var el = document.createElement('script');
+  el.src = '${es5Entrypoint}';
+  document.body.appendChild(el);
+}
+if (/.*Version\\/(?:11|12)(?:\\.\\d+)*.*Safari\\//.test(navigator.userAgent)) {
+    loadES5();
+} else {
+  try {
+    new Function("import('${latestEntrypoint}')")();
+  } catch (err) {
+    loadES5();
+  }
+}
+  `,
+    { encoding: "utf-8" }
+  );
+}
@@ -1,13 +1,151 @@
+/* eslint-disable */
 // Run demo develop mode
 const gulp = require("gulp");
+const fs = require("fs");
+const path = require("path");
+const marked = require("marked");
+const glob = require("glob");
+const yaml = require("js-yaml");
+
+const env = require("../env");
+const paths = require("../paths");

 require("./clean.js");
 require("./translations.js");
-require("./gen-icons.js");
+require("./gen-icons-json.js");
 require("./gather-static.js");
 require("./webpack.js");
 require("./service-worker.js");
 require("./entry-html.js");
+require("./rollup.js");
+
+gulp.task("gather-gallery-pages", async function gatherPages() {
+  const pageDir = path.resolve(paths.gallery_dir, "src/pages");
+  const files = glob.sync(path.resolve(pageDir, "**/*"));
+
+  const galleryBuild = path.resolve(paths.gallery_dir, "build");
+  fs.mkdirSync(galleryBuild, { recursive: true });
+
+  let content = "export const PAGES = {\n";
+
+  const processed = new Set();
+
+  for (const file of files) {
+    if (fs.lstatSync(file).isDirectory()) {
+      continue;
+    }
+    const pageId = file.substring(pageDir.length + 1, file.lastIndexOf("."));
+
+    if (processed.has(pageId)) {
+      continue;
+    }
+    processed.add(pageId);
+
+    const [category, name] = pageId.split("/", 2);
+
+    const demoFile = path.resolve(pageDir, `${pageId}.ts`);
+    const descriptionFile = path.resolve(pageDir, `${pageId}.markdown`);
+    const hasDemo = fs.existsSync(demoFile);
+    let hasDescription = fs.existsSync(descriptionFile);
+    let metadata = {};
+    if (hasDescription) {
+      let descriptionContent = fs.readFileSync(descriptionFile, "utf-8");
+
+      if (descriptionContent.startsWith("---")) {
+        const metadataEnd = descriptionContent.indexOf("---", 3);
+        metadata = yaml.load(descriptionContent.substring(3, metadataEnd));
+        descriptionContent = descriptionContent
+          .substring(metadataEnd + 3)
+          .trim();
+      }
+
+      // If description is just metadata
+      if (descriptionContent === "") {
+        hasDescription = false;
+      } else {
+        descriptionContent = marked(descriptionContent).replace(/`/g, "\\`");
+        fs.mkdirSync(path.resolve(galleryBuild, category), { recursive: true });
+        fs.writeFileSync(
+          path.resolve(galleryBuild, `${pageId}-description.ts`),
+          `
+          import {html} from "lit";
+          export default html\`${descriptionContent}\`
+          `
+        );
+      }
+    }
+    content += `  "${pageId}": {
+      metadata: ${JSON.stringify(metadata)},
+      ${
+        hasDescription
+          ? `description: () => import("./${pageId}-description").then(m => m.default),`
+          : ""
+      }
+      ${hasDemo ? `demo: () => import("../src/pages/${pageId}")` : ""}
+
+    },\n`;
+  }
+
+  content += "};\n";
+
+  // Generate sidebar
+  const sidebarPath = path.resolve(paths.gallery_dir, "sidebar.js");
+  // To make watch work during development
+  delete require.cache[sidebarPath];
+  const sidebar = require(sidebarPath);
+
+  const pagesToProcess = {};
+  for (const key of processed) {
+    const [category, page] = key.split("/", 2);
+    if (!(category in pagesToProcess)) {
+      pagesToProcess[category] = new Set();
+    }
+    pagesToProcess[category].add(page);
+  }
+
+  for (const group of Object.values(sidebar)) {
+    const toProcess = pagesToProcess[group.category];
+    delete pagesToProcess[group.category];
+
+    if (!toProcess) {
+      console.error("Unknown category", group.category);
+      if (!group.pages) {
+        group.pages = [];
+      }
+      continue;
+    }
+
+    // Any pre-defined groups will not be sorted.
+    if (group.pages) {
+      for (const page of group.pages) {
+        if (!toProcess.delete(page)) {
+          console.error("Found unreferenced demo", page);
+        }
+      }
+    } else {
+      group.pages = [];
+    }
+    for (const page of Array.from(toProcess).sort()) {
+      group.pages.push(page);
+    }
+  }
+
+  for (const [category, pages] of Object.entries(pagesToProcess)) {
+    sidebar.push({
+      category,
+      header: category,
+      pages: Array.from(pages).sort(),
+    });
+  }
+
+  content += `export const SIDEBAR = ${JSON.stringify(sidebar, null, 2)};\n`;
+
+  fs.writeFileSync(
+    path.resolve(galleryBuild, "import-pages.ts"),
+    content,
+    "utf-8"
+  );
+});

 gulp.task(
  "develop-gallery",
@@ -16,10 +154,29 @@ gulp.task(
      process.env.NODE_ENV = "development";
    },
    "clean-gallery",
-    gulp.parallel("gen-icons-app", "gen-icons-app", "build-translations"),
+    "translations-enable-merge-backend",
+    gulp.parallel(
+      "gen-icons-json",
+      "build-translations",
+      "build-locale-data",
+      "gather-gallery-pages"
+    ),
    "copy-static-gallery",
    "gen-index-gallery-dev",
-    "webpack-dev-server-gallery"
+    gulp.parallel(
+      env.useRollup()
+        ? "rollup-dev-server-gallery"
+        : "webpack-dev-server-gallery",
+      async function watchMarkdownFiles() {
+        gulp.watch(
+          [
+            path.resolve(paths.gallery_dir, "src/pages/**/*.markdown"),
+            path.resolve(paths.gallery_dir, "sidebar.js"),
+          ],
+          gulp.series("gather-gallery-pages")
+        );
+      }
+    )
  )
 );

@@ -30,9 +187,15 @@ gulp.task(
      process.env.NODE_ENV = "production";
    },
    "clean-gallery",
-    gulp.parallel("gen-icons-app", "gen-icons-mdi", "build-translations"),
+    "translations-enable-merge-backend",
+    gulp.parallel(
+      "gen-icons-json",
+      "build-translations",
+      "build-locale-data",
+      "gather-gallery-pages"
+    ),
    "copy-static-gallery",
-    "webpack-prod-gallery",
+    env.useRollup() ? "rollup-prod-gallery" : "webpack-prod-gallery",
    "gen-index-gallery-prod"
  )
 );
@@ -2,7 +2,6 @@

 const gulp = require("gulp");
 const path = require("path");
-const cpx = require("cpx");
 const fs = require("fs-extra");
 const paths = require("../paths");

@@ -13,27 +12,45 @@ const polyPath = (...parts) => path.resolve(paths.polymer_dir, ...parts);
 const copyFileDir = (fromFile, toDir) =>
  fs.copySync(fromFile, path.join(toDir, path.basename(fromFile)));

-const genStaticPath = (staticDir) => (...parts) =>
-  path.resolve(staticDir, ...parts);
+const genStaticPath =
+  (staticDir) =>
+  (...parts) =>
+    path.resolve(staticDir, ...parts);

 function copyTranslations(staticDir) {
  const staticPath = genStaticPath(staticDir);

  // Translation output
  fs.copySync(
-    polyPath("build-translations/output"),
+    polyPath("build/translations/output"),
    staticPath("translations")
  );
 }

+function copyLocaleData(staticDir) {
+  const staticPath = genStaticPath(staticDir);
+
+  // Locale data output
+  fs.copySync(polyPath("build/locale-data"), staticPath("locale-data"));
+}
+
+function copyMdiIcons(staticDir) {
+  const staticPath = genStaticPath(staticDir);
+
+  // MDI icons output
+  fs.copySync(polyPath("build/mdi"), staticPath("mdi"));
+}
+
 function copyPolyfills(staticDir) {
  const staticPath = genStaticPath(staticDir);

-  // Web Component polyfills and adapters
+  // For custom panels using ES5 builds that don't use Babel 7+
  copyFileDir(
    npmPath("@webcomponents/webcomponentsjs/custom-elements-es5-adapter.js"),
    staticPath("polyfills/")
  );
+
+  // Web Component polyfills and adapters
  copyFileDir(
    npmPath("@webcomponents/webcomponentsjs/webcomponents-bundle.js"),
    staticPath("polyfills/")
@@ -44,15 +61,29 @@ function copyPolyfills(staticDir) {
  );
 }

+function copyLoaderJS(staticDir) {
+  const staticPath = genStaticPath(staticDir);
+  copyFileDir(npmPath("systemjs/dist/s.min.js"), staticPath("js"));
+  copyFileDir(npmPath("systemjs/dist/s.min.js.map"), staticPath("js"));
+}
+
 function copyFonts(staticDir) {
  const staticPath = genStaticPath(staticDir);
  // Local fonts
-  cpx.copySync(
-    npmPath("roboto-fontface/fonts/roboto/*.woff2"),
-    staticPath("fonts/roboto")
+  fs.copySync(
+    npmPath("roboto-fontface/fonts/roboto/"),
+    staticPath("fonts/roboto/"),
+    {
+      filter: (src) => !src.includes(".") || src.endsWith(".woff2"),
+    }
  );
 }

+function copyQrScannerWorker(staticDir) {
+  const staticPath = genStaticPath(staticDir);
+  copyFileDir(npmPath("qr-scanner/qr-scanner-worker.min.js"), staticPath("js"));
+}
+
 function copyMapPanel(staticDir) {
  const staticPath = genStaticPath(staticDir);
  copyFileDir(
@@ -65,61 +96,90 @@ function copyMapPanel(staticDir) {
  );
 }

-gulp.task("copy-static", (done) => {
-  const staticDir = paths.static;
-  const staticPath = genStaticPath(paths.static);
-  // Basic static files
-  fs.copySync(polyPath("public"), paths.root);
+gulp.task("copy-locale-data", async () => {
+  const staticDir = paths.app_output_static;
+  copyLocaleData(staticDir);
+});

+gulp.task("copy-translations-app", async () => {
+  const staticDir = paths.app_output_static;
+  copyTranslations(staticDir);
+});
+
+gulp.task("copy-translations-supervisor", async () => {
+  const staticDir = paths.hassio_output_static;
+  copyTranslations(staticDir);
+});
+
+gulp.task("copy-locale-data-supervisor", async () => {
+  const staticDir = paths.hassio_output_static;
+  copyLocaleData(staticDir);
+});
+
+gulp.task("copy-static-app", async () => {
+  const staticDir = paths.app_output_static;
+  // Basic static files
+  fs.copySync(polyPath("public"), paths.app_output_root);
+
+  copyLoaderJS(staticDir);
  copyPolyfills(staticDir);
  copyFonts(staticDir);
  copyTranslations(staticDir);
+  copyLocaleData(staticDir);
+  copyMdiIcons(staticDir);

  // Panel assets
-  copyFileDir(
-    npmPath("react-big-calendar/lib/css/react-big-calendar.css"),
-    staticPath("panels/calendar/")
-  );
  copyMapPanel(staticDir);
-  done();
+
+  // Qr Scanner assets
+  copyQrScannerWorker(staticDir);
 });

-gulp.task("copy-static-demo", (done) => {
+gulp.task("copy-static-demo", async () => {
  // Copy app static files
  fs.copySync(
    polyPath("public/static"),
-    path.resolve(paths.demo_root, "static")
+    path.resolve(paths.demo_output_root, "static")
  );
  // Copy demo static files
-  fs.copySync(path.resolve(paths.demo_dir, "public"), paths.demo_root);
+  fs.copySync(path.resolve(paths.demo_dir, "public"), paths.demo_output_root);

-  copyPolyfills(paths.demo_static);
-  copyMapPanel(paths.demo_static);
-  copyFonts(paths.demo_static);
-  copyTranslations(paths.demo_static);
-  done();
+  copyLoaderJS(paths.demo_output_static);
+  copyPolyfills(paths.demo_output_static);
+  copyMapPanel(paths.demo_output_static);
+  copyFonts(paths.demo_output_static);
+  copyTranslations(paths.demo_output_static);
+  copyLocaleData(paths.demo_output_static);
+  copyMdiIcons(paths.demo_output_static);
 });

-gulp.task("copy-static-cast", (done) => {
+gulp.task("copy-static-cast", async () => {
  // Copy app static files
-  fs.copySync(polyPath("public/static"), paths.cast_static);
+  fs.copySync(polyPath("public/static"), paths.cast_output_static);
  // Copy cast static files
-  fs.copySync(path.resolve(paths.cast_dir, "public"), paths.cast_root);
+  fs.copySync(path.resolve(paths.cast_dir, "public"), paths.cast_output_root);

-  copyMapPanel(paths.cast_static);
-  copyFonts(paths.cast_static);
-  copyTranslations(paths.cast_static);
-  done();
+  copyLoaderJS(paths.cast_output_static);
+  copyPolyfills(paths.cast_output_static);
+  copyMapPanel(paths.cast_output_static);
+  copyFonts(paths.cast_output_static);
+  copyTranslations(paths.cast_output_static);
+  copyLocaleData(paths.cast_output_static);
+  copyMdiIcons(paths.cast_output_static);
 });

-gulp.task("copy-static-gallery", (done) => {
+gulp.task("copy-static-gallery", async () => {
  // Copy app static files
-  fs.copySync(polyPath("public/static"), paths.gallery_static);
+  fs.copySync(polyPath("public/static"), paths.gallery_output_static);
  // Copy gallery static files
-  fs.copySync(path.resolve(paths.gallery_dir, "public"), paths.gallery_root);
+  fs.copySync(
+    path.resolve(paths.gallery_dir, "public"),
+    paths.gallery_output_root
+  );

-  copyMapPanel(paths.gallery_static);
-  copyFonts(paths.gallery_static);
-  copyTranslations(paths.gallery_static);
-  done();
+  copyMapPanel(paths.gallery_output_static);
+  copyFonts(paths.gallery_output_static);
+  copyTranslations(paths.gallery_output_static);
+  copyLocaleData(paths.gallery_output_static);
+  copyMdiIcons(paths.gallery_output_static);
 });
@@ -0,0 +1,158 @@
+const gulp = require("gulp");
+const path = require("path");
+const fs = require("fs");
+const hash = require("object-hash");
+
+const ICON_PACKAGE_PATH = path.resolve(
+  __dirname,
+  "../../node_modules/@mdi/svg/"
+);
+const META_PATH = path.resolve(ICON_PACKAGE_PATH, "meta.json");
+const PACKAGE_PATH = path.resolve(ICON_PACKAGE_PATH, "package.json");
+const ICON_PATH = path.resolve(ICON_PACKAGE_PATH, "svg");
+const OUTPUT_DIR = path.resolve(__dirname, "../../build/mdi");
+const REMOVED_ICONS_PATH = path.resolve(__dirname, "../removedIcons.json");
+
+const encoding = "utf8";
+
+const getMeta = () => {
+  const file = fs.readFileSync(META_PATH, { encoding });
+  const meta = JSON.parse(file);
+  return meta.map((icon) => {
+    const svg = fs.readFileSync(`${ICON_PATH}/${icon.name}.svg`, {
+      encoding,
+    });
+    return {
+      path: svg.match(/ d="([^"]+)"/)[1],
+      name: icon.name,
+      tags: icon.tags,
+      aliases: icon.aliases,
+    };
+  });
+};
+
+const addRemovedMeta = (meta) => {
+  const file = fs.readFileSync(REMOVED_ICONS_PATH, { encoding });
+  const removed = JSON.parse(file);
+  const removedMeta = removed.map((removeIcon) => ({
+    path: removeIcon.path,
+    name: removeIcon.name,
+    tags: [],
+    aliases: [],
+  }));
+  const combinedMeta = [...meta, ...removedMeta];
+  return combinedMeta.sort((a, b) => a.name.localeCompare(b.name));
+};
+
+const homeAutomationTag = "Home Automation";
+
+const orderMeta = (meta) => {
+  const homeAutomationMeta = meta.filter((icon) =>
+    icon.tags.includes(homeAutomationTag)
+  );
+  const otherMeta = meta.filter(
+    (icon) => !icon.tags.includes(homeAutomationTag)
+  );
+  return [...homeAutomationMeta, ...otherMeta];
+};
+
+const splitBySize = (meta) => {
+  const chunks = [];
+  const CHUNK_SIZE = 50000;
+
+  let curSize = 0;
+  let startKey;
+  let icons = [];
+
+  Object.values(meta).forEach((icon) => {
+    if (startKey === undefined) {
+      startKey = icon.name;
+    }
+    curSize += icon.path.length;
+    icons.push(icon);
+    if (curSize > CHUNK_SIZE) {
+      chunks.push({
+        startKey,
+        endKey: icon.name,
+        icons,
+      });
+      curSize = 0;
+      startKey = undefined;
+      icons = [];
+    }
+  });
+
+  chunks.push({
+    startKey,
+    icons,
+  });
+
+  return chunks;
+};
+
+const findDifferentiator = (curString, prevString) => {
+  for (let i = 0; i < curString.length; i++) {
+    if (curString[i] !== prevString[i]) {
+      return curString.substring(0, i + 1);
+    }
+  }
+  throw new Error("Cannot find differentiator", curString, prevString);
+};
+
+gulp.task("gen-icons-json", (done) => {
+  const meta = getMeta();
+
+  const metaAndRemoved = addRemovedMeta(meta);
+  const split = splitBySize(metaAndRemoved);
+
+  if (!fs.existsSync(OUTPUT_DIR)) {
+    fs.mkdirSync(OUTPUT_DIR, { recursive: true });
+  }
+  const parts = [];
+
+  let lastEnd;
+  split.forEach((chunk) => {
+    let startKey;
+    if (lastEnd === undefined) {
+      chunk.startKey = undefined;
+      startKey = undefined;
+    } else {
+      startKey = findDifferentiator(chunk.startKey, lastEnd);
+    }
+    lastEnd = chunk.endKey;
+
+    const output = {};
+    chunk.icons.forEach((icon) => {
+      output[icon.name] = icon.path;
+    });
+    const filename = hash(output);
+    parts.push({ start: startKey, file: filename });
+    fs.writeFileSync(
+      path.resolve(OUTPUT_DIR, `${filename}.json`),
+      JSON.stringify(output)
+    );
+  });
+
+  const file = fs.readFileSync(PACKAGE_PATH, { encoding });
+  const package = JSON.parse(file);
+
+  fs.writeFileSync(
+    path.resolve(OUTPUT_DIR, "iconMetadata.json"),
+    JSON.stringify({ version: package.version, parts })
+  );
+
+  fs.writeFileSync(
+    path.resolve(OUTPUT_DIR, "iconList.json"),
+    JSON.stringify(
+      orderMeta(meta).map((icon) => ({
+        name: icon.name,
+        keywords: [
+          ...icon.tags.map((t) => t.toLowerCase().replace(/\s\/\s/g, " ")),
+          ...icon.aliases,
+        ],
+      }))
+    )
+  );
+
+  done();
+});
@@ -1,140 +0,0 @@
-const gulp = require("gulp");
-const path = require("path");
-const fs = require("fs");
-const paths = require("../paths");
-
-const ICON_PACKAGE_PATH = path.resolve(
-  __dirname,
-  "../../node_modules/@mdi/svg/"
-);
-const META_PATH = path.resolve(ICON_PACKAGE_PATH, "meta.json");
-const ICON_PATH = path.resolve(ICON_PACKAGE_PATH, "svg");
-const OUTPUT_DIR = path.resolve(__dirname, "../../build");
-const MDI_OUTPUT_PATH = path.resolve(OUTPUT_DIR, "mdi.html");
-const HASS_OUTPUT_PATH = path.resolve(OUTPUT_DIR, "hass-icons.html");
-
-const BUILT_IN_PANEL_ICONS = [
-  "calendar", // Calendar
-  "settings", // Config
-  "home-assistant", // Hass.io
-  "poll-box", // History panel
-  "format-list-bulleted-type", // Logbook
-  "mailbox", // Mailbox
-  "tooltip-account", // Map
-  "cart", // Shopping List
-  "hammer", // developer-tools
-];
-
-// Given an icon name, load the SVG file
-function loadIcon(name) {
-  const iconPath = path.resolve(ICON_PATH, `${name}.svg`);
-  try {
-    return fs.readFileSync(iconPath, "utf-8");
-  } catch (err) {
-    return null;
-  }
-}
-
-// Given an SVG file, convert it to an iron-iconset-svg definition
-function transformXMLtoPolymer(name, xml) {
-  const start = xml.indexOf("><path") + 1;
-  const end = xml.length - start - 6;
-  const pth = xml.substr(start, end);
-  return `<g id="${name}">${pth}</g>`;
-}
-
-// Given an iconset name and icon names, generate a polymer iconset
-function generateIconset(iconsetName, iconNames) {
-  const iconDefs = Array.from(iconNames)
-    .map((name) => {
-      const iconDef = loadIcon(name);
-      if (!iconDef) {
-        throw new Error(`Unknown icon referenced: ${name}`);
-      }
-      return transformXMLtoPolymer(name, iconDef);
-    })
-    .join("");
-  return `<ha-iconset-svg name="${iconsetName}" size="24"><svg><defs>${iconDefs}</defs></svg></ha-iconset-svg>`;
-}
-
-// Helper function to map recursively over files in a folder and it's subfolders
-function mapFiles(startPath, filter, mapFunc) {
-  const files = fs.readdirSync(startPath);
-  for (let i = 0; i < files.length; i++) {
-    const filename = path.join(startPath, files[i]);
-    const stat = fs.lstatSync(filename);
-    if (stat.isDirectory()) {
-      mapFiles(filename, filter, mapFunc);
-    } else if (filename.indexOf(filter) >= 0) {
-      mapFunc(filename);
-    }
-  }
-}
-
-// Find all icons used by the project.
-function findIcons(searchPath, iconsetName) {
-  const iconRegex = new RegExp(`${iconsetName}:[\\w-]+`, "g");
-  const icons = new Set();
-  function processFile(filename) {
-    const content = fs.readFileSync(filename);
-    let match;
-    // eslint-disable-next-line
-    while ((match = iconRegex.exec(content))) {
-      // strip off "hass:" and add to set
-      icons.add(match[0].substr(iconsetName.length + 1));
-    }
-  }
-  mapFiles(searchPath, ".js", processFile);
-  mapFiles(searchPath, ".ts", processFile);
-  return icons;
-}
-
-gulp.task("gen-icons-mdi", (done) => {
-  const meta = JSON.parse(
-    fs.readFileSync(path.resolve(ICON_PACKAGE_PATH, META_PATH), "UTF-8")
-  );
-  const iconNames = meta.map((iconInfo) => iconInfo.name);
-  if (!fs.existsSync(OUTPUT_DIR)) {
-    fs.mkdirSync(OUTPUT_DIR);
-  }
-  fs.writeFileSync(MDI_OUTPUT_PATH, generateIconset("mdi", iconNames));
-  done();
-});
-
-gulp.task("gen-icons-app", (done) => {
-  const iconNames = findIcons("./src", "hass");
-  BUILT_IN_PANEL_ICONS.forEach((name) => iconNames.add(name));
-  if (!fs.existsSync(OUTPUT_DIR)) {
-    fs.mkdirSync(OUTPUT_DIR);
-  }
-  fs.writeFileSync(HASS_OUTPUT_PATH, generateIconset("hass", iconNames));
-  done();
-});
-
-gulp.task("gen-icons-demo", (done) => {
-  const iconNames = findIcons(path.resolve(paths.demo_dir, "./src"), "hademo");
-  fs.writeFileSync(
-    path.resolve(paths.demo_dir, "hademo-icons.html"),
-    generateIconset("hademo", iconNames)
-  );
-  done();
-});
-
-gulp.task("gen-icons-hassio", (done) => {
-  const iconNames = findIcons(
-    path.resolve(paths.hassio_dir, "./src"),
-    "hassio"
-  );
-  // Find hassio icons inside HA main repo.
-  for (const item of findIcons(
-    path.resolve(paths.polymer_dir, "./src"),
-    "hassio"
-  )) {
-    iconNames.add(item);
-  }
-  fs.writeFileSync(
-    path.resolve(paths.hassio_dir, "hassio-icons.html"),
-    generateIconset("hassio", iconNames)
-  );
-  done();
-});
@@ -1,11 +1,14 @@
 const gulp = require("gulp");

-const envVars = require("../env");
+const env = require("../env");

 require("./clean.js");
-require("./gen-icons.js");
+require("./gen-icons-json.js");
 require("./webpack.js");
 require("./compress.js");
+require("./rollup.js");
+require("./gather-static.js");
+require("./translations.js");

 gulp.task(
  "develop-hassio",
@@ -14,8 +17,12 @@ gulp.task(
      process.env.NODE_ENV = "development";
    },
    "clean-hassio",
-    gulp.parallel("gen-icons-hassio", "gen-icons-mdi"),
-    "webpack-watch-hassio"
+    "gen-index-hassio-dev",
+    "build-supervisor-translations",
+    "copy-translations-supervisor",
+    "build-locale-data",
+    "copy-locale-data-supervisor",
+    env.useRollup() ? "rollup-watch-hassio" : "webpack-watch-hassio"
  )
 );

@@ -26,9 +33,13 @@ gulp.task(
      process.env.NODE_ENV = "production";
    },
    "clean-hassio",
-    gulp.parallel("gen-icons-hassio", "gen-icons-mdi"),
-    "webpack-prod-hassio",
+    "build-supervisor-translations",
+    "copy-translations-supervisor",
+    "build-locale-data",
+    "copy-locale-data-supervisor",
+    env.useRollup() ? "rollup-prod-hassio" : "webpack-prod-hassio",
+    "gen-index-hassio-prod",
    ...// Don't compress running tests
-    (envVars.isTravis ? [] : ["compress-hassio"])
+    (env.isTest() ? [] : ["compress-hassio"])
  )
 );
@@ -0,0 +1,74 @@
+/* eslint-disable @typescript-eslint/no-var-requires */
+
+const del = require("del");
+const path = require("path");
+const gulp = require("gulp");
+const fs = require("fs");
+const paths = require("../paths");
+
+const outDir = "build/locale-data";
+
+gulp.task("clean-locale-data", () => del([outDir]));
+
+gulp.task("ensure-locale-data-build-dir", (done) => {
+  if (!fs.existsSync(outDir)) {
+    fs.mkdirSync(outDir, { recursive: true });
+  }
+  done();
+});
+
+const modules = {
+  "intl-relativetimeformat": "RelativeTimeFormat",
+  "intl-datetimeformat": "DateTimeFormat",
+  "intl-numberformat": "NumberFormat",
+};
+
+gulp.task("create-locale-data", (done) => {
+  const translationMeta = JSON.parse(
+    fs.readFileSync(
+      path.join(paths.translations_src, "translationMetadata.json")
+    )
+  );
+  Object.entries(modules).forEach(([module, className]) => {
+    Object.keys(translationMeta).forEach((lang) => {
+      try {
+        const localeData = String(
+          fs.readFileSync(
+            require.resolve(`@formatjs/${module}/locale-data/${lang}.js`)
+          )
+        )
+          .replace(
+            new RegExp(
+              `\\/\\*\\s*@generated\\s*\\*\\/\\s*\\/\\/\\s*prettier-ignore\\s*if\\s*\\(Intl\\.${className}\\s*&&\\s*typeof\\s*Intl\\.${className}\\.__addLocaleData\\s*===\\s*'function'\\)\\s*{\\s*Intl\\.${className}\\.__addLocaleData\\(`,
+              "im"
+            ),
+            ""
+          )
+          .replace(/\)\s*}/im, "");
+        // make sure we have valid JSON
+        JSON.parse(localeData);
+        if (!fs.existsSync(path.join(outDir, module))) {
+          fs.mkdirSync(path.join(outDir, module), { recursive: true });
+        }
+        fs.writeFileSync(
+          path.join(outDir, `${module}/${lang}.json`),
+          localeData
+        );
+      } catch (e) {
+        if (e.code !== "MODULE_NOT_FOUND") {
+          throw e;
+        }
+      }
+    });
+    done();
+  });
+});
+
+gulp.task(
+  "build-locale-data",
+  gulp.series(
+    "clean-locale-data",
+    "ensure-locale-data-build-dir",
+    "create-locale-data"
+  )
+);
@@ -0,0 +1,146 @@
+// Tasks to run Rollup
+const path = require("path");
+const gulp = require("gulp");
+const rollup = require("rollup");
+const handler = require("serve-handler");
+const http = require("http");
+const log = require("fancy-log");
+const rollupConfig = require("../rollup");
+const paths = require("../paths");
+const open = require("open");
+
+const bothBuilds = (createConfigFunc, params) =>
+  gulp.series(
+    async function buildLatest() {
+      await buildRollup(
+        createConfigFunc({
+          ...params,
+          latestBuild: true,
+        })
+      );
+    },
+    async function buildES5() {
+      await buildRollup(
+        createConfigFunc({
+          ...params,
+          latestBuild: false,
+        })
+      );
+    }
+  );
+
+function createServer(serveOptions) {
+  const server = http.createServer((request, response) => {
+    return handler(request, response, {
+      public: serveOptions.root,
+    });
+  });
+
+  server.listen(
+    serveOptions.port,
+    serveOptions.networkAccess ? "0.0.0.0" : undefined,
+    () => {
+      log.info(`Available at http://localhost:${serveOptions.port}`);
+      open(`http://localhost:${serveOptions.port}`);
+    }
+  );
+}
+
+function watchRollup(createConfig, extraWatchSrc = [], serveOptions) {
+  const { inputOptions, outputOptions } = createConfig({
+    isProdBuild: false,
+    latestBuild: true,
+  });
+
+  const watcher = rollup.watch({
+    ...inputOptions,
+    output: [outputOptions],
+    watch: {
+      include: ["src/**"] + extraWatchSrc,
+    },
+  });
+
+  let startedHttp = false;
+
+  watcher.on("event", (event) => {
+    if (event.code === "BUNDLE_END") {
+      log(`Build done @ ${new Date().toLocaleTimeString()}`);
+    } else if (event.code === "ERROR") {
+      log.error(event.error);
+    } else if (event.code === "END") {
+      if (startedHttp || !serveOptions) {
+        return;
+      }
+      startedHttp = true;
+      createServer(serveOptions);
+    }
+  });
+
+  gulp.watch(
+    path.join(paths.translations_src, "en.json"),
+    gulp.series("build-translations", "copy-translations-app")
+  );
+}
+
+async function buildRollup(config) {
+  const bundle = await rollup.rollup(config.inputOptions);
+  await bundle.write(config.outputOptions);
+}
+
+gulp.task("rollup-watch-app", () => {
+  watchRollup(rollupConfig.createAppConfig);
+});
+
+gulp.task("rollup-watch-hassio", () => {
+  watchRollup(rollupConfig.createHassioConfig, ["hassio/src/**"]);
+});
+
+gulp.task("rollup-dev-server-demo", () => {
+  watchRollup(rollupConfig.createDemoConfig, ["demo/src/**"], {
+    root: paths.demo_output_root,
+    port: 8090,
+  });
+});
+
+gulp.task("rollup-dev-server-cast", () => {
+  watchRollup(rollupConfig.createCastConfig, ["cast/src/**"], {
+    root: paths.cast_output_root,
+    port: 8080,
+    networkAccess: true,
+  });
+});
+
+gulp.task("rollup-dev-server-gallery", () => {
+  watchRollup(rollupConfig.createGalleryConfig, ["gallery/src/**"], {
+    root: paths.gallery_output_root,
+    port: 8100,
+  });
+});
+
+gulp.task(
+  "rollup-prod-app",
+  bothBuilds(rollupConfig.createAppConfig, { isProdBuild: true })
+);
+
+gulp.task(
+  "rollup-prod-demo",
+  bothBuilds(rollupConfig.createDemoConfig, { isProdBuild: true })
+);
+
+gulp.task(
+  "rollup-prod-cast",
+  bothBuilds(rollupConfig.createCastConfig, { isProdBuild: true })
+);
+
+gulp.task("rollup-prod-hassio", () =>
+  bothBuilds(rollupConfig.createHassioConfig, { isProdBuild: true })
+);
+
+gulp.task("rollup-prod-gallery", () =>
+  buildRollup(
+    rollupConfig.createGalleryConfig({
+      isProdBuild: true,
+      latestBuild: true,
+    })
+  )
+);
@@ -5,18 +5,22 @@
 const gulp = require("gulp");
 const path = require("path");
 const fs = require("fs-extra");
-const config = require("../paths.js");
+const workboxBuild = require("workbox-build");
+const sourceMapUrl = require("source-map-url");
+const paths = require("../paths.js");

-const swPath = path.resolve(config.root, "service_worker.js");
+const swDest = path.resolve(paths.app_output_root, "service_worker.js");

-const writeSW = (content) => fs.outputFileSync(swPath, content.trim() + "\n");
+const writeSW = (content) => fs.outputFileSync(swDest, content.trim() + "\n");

-gulp.task("gen-service-worker-dev", (done) => {
+gulp.task("gen-service-worker-app-dev", (done) => {
  writeSW(
    `
 console.debug('Service worker disabled in development');

 self.addEventListener('install', (event) => {
+  // This will activate the dev service worker,
+  // removing any prod service worker the dev might have running
  self.skipWaiting();
 });
  `
@@ -24,10 +28,69 @@ self.addEventListener('install', (event) => {
  done();
 });

-gulp.task("gen-service-worker-prod", (done) => {
-  fs.copySync(
-    path.resolve(config.output, "service_worker.js"),
-    path.resolve(config.root, "service_worker.js")
+gulp.task("gen-service-worker-app-prod", async () => {
+  // Read bundled source file
+  const bundleManifestLatest = require(path.resolve(
+    paths.app_output_latest,
+    "manifest.json"
+  ));
+  let serviceWorkerContent = fs.readFileSync(
+    paths.app_output_root + bundleManifestLatest["service_worker.js"],
+    "utf-8"
  );
-  done();
+
+  // Delete old file from frontend_latest so manifest won't pick it up
+  fs.removeSync(
+    paths.app_output_root + bundleManifestLatest["service_worker.js"]
+  );
+  fs.removeSync(
+    paths.app_output_root + bundleManifestLatest["service_worker.js.map"]
+  );
+
+  // Remove ES5
+  const bundleManifestES5 = require(path.resolve(
+    paths.app_output_es5,
+    "manifest.json"
+  ));
+  fs.removeSync(paths.app_output_root + bundleManifestES5["service_worker.js"]);
+  fs.removeSync(
+    paths.app_output_root + bundleManifestES5["service_worker.js.map"]
+  );
+
+  const workboxManifest = await workboxBuild.getManifest({
+    // Files that mach this pattern will be considered unique and skip revision check
+    // ignore JS files + translation files
+    dontCacheBustURLsMatching: /(frontend_latest\/.+|static\/translations\/.+)/,
+
+    globDirectory: paths.app_output_root,
+    globPatterns: [
+      "frontend_latest/*.js",
+      // Cache all English translations because we catch them as fallback
+      // Using pattern to match hash instead of * to avoid caching en-GB
+      // 'v' added as valid hash letter because in dev we hash with 'dev'
+      "static/translations/**/en-+([a-fv0-9]).json",
+      // Icon shown on splash screen
+      "static/icons/favicon-192x192.png",
+      "static/icons/favicon.ico",
+      // Common fonts
+      "static/fonts/roboto/Roboto-Light.woff2",
+      "static/fonts/roboto/Roboto-Medium.woff2",
+      "static/fonts/roboto/Roboto-Regular.woff2",
+      "static/fonts/roboto/Roboto-Bold.woff2",
+    ],
+  });
+
+  for (const warning of workboxManifest.warnings) {
+    console.warn(warning);
+  }
+
+  // remove source map and add WB manifest
+  serviceWorkerContent = sourceMapUrl.removeFrom(serviceWorkerContent);
+  serviceWorkerContent = serviceWorkerContent.replace(
+    "WB_MANIFEST",
+    JSON.stringify(workboxManifest.manifestEntries)
+  );
+
+  // Write new file to root
+  fs.writeFileSync(swDest, serviceWorkerContent);
 });
@@ -1,49 +1,41 @@
+/* eslint-disable @typescript-eslint/no-var-requires */
+
+const crypto = require("crypto");
 const del = require("del");
 const path = require("path");
+const source = require("vinyl-source-stream");
+const vinylBuffer = require("vinyl-buffer");
 const gulp = require("gulp");
 const fs = require("fs");
 const foreach = require("gulp-foreach");
-const hash = require("gulp-hash");
-const hashFilename = require("gulp-hash-filename");
 const merge = require("gulp-merge-json");
-const minify = require("gulp-jsonminify");
 const rename = require("gulp-rename");
 const transform = require("gulp-json-transform");
+const { mapFiles } = require("../util");
+const env = require("../env");
+const paths = require("../paths");

-const inDir = "translations";
-const workDir = "build-translations";
+const inFrontendDir = "translations/frontend";
+const inBackendDir = "translations/backend";
+const workDir = "build/translations";
 const fullDir = workDir + "/full";
 const coreDir = workDir + "/core";
 const outDir = workDir + "/output";
+let mergeBackend = false;

-String.prototype.rsplit = function(sep, maxsplit) {
-  var split = this.split(sep);
-  return maxsplit
-    ? [split.slice(0, -maxsplit).join(sep)].concat(split.slice(-maxsplit))
-    : split;
-};
+gulp.task("translations-enable-merge-backend", (done) => {
+  mergeBackend = true;
+  done();
+});

-// Panel translations which should be split from the core translations. These
-// should mirror the fragment definitions in polymer.json, so that we load
-// additional resources at equivalent points.
-const TRANSLATION_FRAGMENTS = [
-  "config",
-  "history",
-  "logbook",
-  "mailbox",
-  "profile",
-  "shopping-list",
-  "page-authorize",
-  "page-demo",
-  "page-onboarding",
-  "developer-tools",
-];
-
-const tasks = [];
+// Panel translations which should be split from the core translations.
+const TRANSLATION_FRAGMENTS = Object.keys(
+  require("../../src/translations/en.json").ui.panel
+);

 function recursiveFlatten(prefix, data) {
  let output = {};
-  Object.keys(data).forEach(function(key) {
+  Object.keys(data).forEach((key) => {
    if (typeof data[key] === "object") {
      output = {
        ...output,
@@ -104,10 +96,19 @@ function lokaliseTransform(data, original, file) {
    if (value instanceof Object) {
      output[key] = lokaliseTransform(value, original, file);
    } else {
-      output[key] = value.replace(re_key_reference, (match, key) => {
-        const replace = key.split("::").reduce((tr, k) => tr[k], original);
+      output[key] = value.replace(re_key_reference, (_match, lokalise_key) => {
+        const replace = lokalise_key.split("::").reduce((tr, k) => {
+          if (!tr) {
+            throw Error(
+              `Invalid key placeholder ${lokalise_key} in ${file.path}`
+            );
+          }
+          return tr[k];
+        }, original);
        if (typeof replace !== "string") {
-          throw Error(`Invalid key placeholder ${key} in ${file.path}`);
+          throw Error(
+            `Invalid key placeholder ${lokalise_key} in ${file.path}`
+          );
        }
        return replace;
      });
@@ -116,52 +117,37 @@ function lokaliseTransform(data, original, file) {
  return output;
 }

-let taskName = "clean-translations";
-gulp.task(taskName, function() {
-  return del([`${outDir}/**/*.json`]);
-});
-tasks.push(taskName);
+gulp.task("clean-translations", () => del([workDir]));

 gulp.task("ensure-translations-build-dir", (done) => {
  if (!fs.existsSync(workDir)) {
-    fs.mkdirSync(workDir);
+    fs.mkdirSync(workDir, { recursive: true });
  }
  done();
 });

-taskName = "create-test-metadata";
-gulp.task(
-  taskName,
-  gulp.series("ensure-translations-build-dir", function writeTestMetaData(cb) {
-    fs.writeFile(
-      workDir + "/testMetadata.json",
-      JSON.stringify({
-        test: {
-          nativeName: "Test",
-        },
-      }),
-      cb
-    );
-  })
-);
-tasks.push(taskName);
+gulp.task("create-test-metadata", (cb) => {
+  fs.writeFile(
+    workDir + "/testMetadata.json",
+    JSON.stringify({
+      test: {
+        nativeName: "Test",
+      },
+    }),
+    cb
+  );
+});

-taskName = "create-test-translation";
 gulp.task(
-  taskName,
-  gulp.series("create-test-metadata", function() {
-    return gulp
-      .src("src/translations/en.json")
-      .pipe(
-        transform(function(data, file) {
-          return recursiveEmpty(data);
-        })
-      )
+  "create-test-translation",
+  gulp.series("create-test-metadata", () =>
+    gulp
+      .src(path.join(paths.translations_src, "en.json"))
+      .pipe(transform((data, _file) => recursiveEmpty(data)))
      .pipe(rename("test.json"))
-      .pipe(gulp.dest(workDir));
-  })
+      .pipe(gulp.dest(workDir))
+  )
 );
-tasks.push(taskName);

 /**
 * This task will build a master translation file, to be used as the base for
@@ -172,235 +158,277 @@ tasks.push(taskName);
 * project is buildable immediately after merging new translation keys, since
 * the Lokalise update to translations/en.json will not happen immediately.
 */
-taskName = "build-master-translation";
-gulp.task(
-  taskName,
-  gulp.series("clean-translations", function() {
-    return gulp
-      .src("src/translations/en.json")
-      .pipe(
-        transform(function(data, file) {
-          return lokaliseTransform(data, data, file);
-        })
-      )
-      .pipe(rename("translationMaster.json"))
-      .pipe(gulp.dest(workDir));
-  })
-);
-tasks.push(taskName);
+gulp.task("build-master-translation", () => {
+  const src = [path.join(paths.translations_src, "en.json")];

-taskName = "build-merged-translations";
-gulp.task(
-  taskName,
-  gulp.series("build-master-translation", function() {
-    return gulp
-      .src([inDir + "/*.json", workDir + "/test.json"], { allowEmpty: true })
-      .pipe(
-        transform(function(data, file) {
-          return lokaliseTransform(data, data, file);
-        })
-      )
-      .pipe(
-        foreach(function(stream, file) {
-          // For each language generate a merged json file. It begins with the master
-          // translation as a failsafe for untranslated strings, and merges all parent
-          // tags into one file for each specific subtag
-          //
-          // TODO: This is a naive interpretation of BCP47 that should be improved.
-          //       Will be OK for now as long as we don't have anything more complicated
-          //       than a base translation + region.
-          const tr = path.basename(file.history[0], ".json");
-          const subtags = tr.split("-");
-          const src = [workDir + "/translationMaster.json"];
-          for (let i = 1; i <= subtags.length; i++) {
-            const lang = subtags.slice(0, i).join("-");
-            if (lang === "test") {
-              src.push(workDir + "/test.json");
-            } else if (lang !== "en") {
-              src.push(inDir + "/" + lang + ".json");
+  if (mergeBackend) {
+    src.push(path.join(inBackendDir, "en.json"));
+  }
+
+  return gulp
+    .src(src)
+    .pipe(transform((data, file) => lokaliseTransform(data, data, file)))
+    .pipe(
+      merge({
+        fileName: "translationMaster.json",
+      })
+    )
+    .pipe(gulp.dest(workDir));
+});
+
+gulp.task("build-merged-translations", () =>
+  gulp
+    .src([inFrontendDir + "/*.json", workDir + "/test.json"], {
+      allowEmpty: true,
+    })
+    .pipe(transform((data, file) => lokaliseTransform(data, data, file)))
+    .pipe(
+      foreach((stream, file) => {
+        // For each language generate a merged json file. It begins with the master
+        // translation as a failsafe for untranslated strings, and merges all parent
+        // tags into one file for each specific subtag
+        //
+        // TODO: This is a naive interpretation of BCP47 that should be improved.
+        //       Will be OK for now as long as we don't have anything more complicated
+        //       than a base translation + region.
+        const tr = path.basename(file.history[0], ".json");
+        const subtags = tr.split("-");
+        const src = [workDir + "/translationMaster.json"];
+        for (let i = 1; i <= subtags.length; i++) {
+          const lang = subtags.slice(0, i).join("-");
+          if (lang === "test") {
+            src.push(workDir + "/test.json");
+          } else if (lang !== "en") {
+            src.push(inFrontendDir + "/" + lang + ".json");
+            if (mergeBackend) {
+              src.push(inBackendDir + "/" + lang + ".json");
            }
          }
-          return gulp
-            .src(src, { allowEmpty: true })
-            .pipe(transform((data) => emptyFilter(data)))
-            .pipe(
-              merge({
-                fileName: tr + ".json",
-              })
-            )
-            .pipe(gulp.dest(fullDir));
-        })
-      );
-  })
+        }
+        return gulp
+          .src(src, { allowEmpty: true })
+          .pipe(transform((data) => emptyFilter(data)))
+          .pipe(
+            merge({
+              fileName: tr + ".json",
+            })
+          )
+          .pipe(gulp.dest(fullDir));
+      })
+    )
 );
-tasks.push(taskName);
+
+let taskName;

 const splitTasks = [];
 TRANSLATION_FRAGMENTS.forEach((fragment) => {
  taskName = "build-translation-fragment-" + fragment;
-  gulp.task(
-    taskName,
-    gulp.series("build-merged-translations", function() {
-      // Return only the translations for this fragment.
-      return gulp
-        .src(fullDir + "/*.json")
-        .pipe(
-          transform((data) => ({
-            ui: {
-              panel: {
-                [fragment]: data.ui.panel[fragment],
-              },
+  gulp.task(taskName, () =>
+    // Return only the translations for this fragment.
+    gulp
+      .src(fullDir + "/*.json")
+      .pipe(
+        transform((data) => ({
+          ui: {
+            panel: {
+              [fragment]: data.ui.panel[fragment],
            },
-          }))
-        )
-        .pipe(gulp.dest(workDir + "/" + fragment));
-    })
+          },
+        }))
+      )
+      .pipe(gulp.dest(workDir + "/" + fragment))
  );
-  tasks.push(taskName);
  splitTasks.push(taskName);
 });

 taskName = "build-translation-core";
-gulp.task(
-  taskName,
-  gulp.series("build-merged-translations", function() {
-    // Remove the fragment translations from the core translation.
-    return gulp
-      .src(fullDir + "/*.json")
-      .pipe(
-        transform((data) => {
-          TRANSLATION_FRAGMENTS.forEach((fragment) => {
-            delete data.ui.panel[fragment];
-          });
-          return data;
-        })
-      )
-      .pipe(gulp.dest(coreDir));
-  })
+gulp.task(taskName, () =>
+  // Remove the fragment translations from the core translation.
+  gulp
+    .src(fullDir + "/*.json")
+    .pipe(
+      transform((data, _file) => {
+        TRANSLATION_FRAGMENTS.forEach((fragment) => {
+          delete data.ui.panel[fragment];
+        });
+        delete data.supervisor;
+        return data;
+      })
+    )
+    .pipe(gulp.dest(coreDir))
 );
-tasks.push(taskName);
+
 splitTasks.push(taskName);

-taskName = "build-flattened-translations";
-gulp.task(
-  taskName,
-  gulp.series(...splitTasks, function() {
-    // Flatten the split versions of our translations, and move them into outDir
-    return gulp
-      .src(
-        TRANSLATION_FRAGMENTS.map(
-          (fragment) => workDir + "/" + fragment + "/*.json"
-        ).concat(coreDir + "/*.json"),
-        { base: workDir }
+gulp.task("build-flattened-translations", () =>
+  // Flatten the split versions of our translations, and move them into outDir
+  gulp
+    .src(
+      TRANSLATION_FRAGMENTS.map(
+        (fragment) => workDir + "/" + fragment + "/*.json"
+      ).concat(coreDir + "/*.json"),
+      { base: workDir }
+    )
+    .pipe(
+      transform((data) =>
+        // Polymer.AppLocalizeBehavior requires flattened json
+        flatten(data)
      )
-      .pipe(
-        transform(function(data) {
-          // Polymer.AppLocalizeBehavior requires flattened json
-          return flatten(data);
-        })
+    )
+    .pipe(
+      rename((filePath) => {
+        if (filePath.dirname === "core") {
+          filePath.dirname = "";
+        }
+        // In dev we create the file with the fake hash in the filename
+        if (!env.isProdBuild()) {
+          filePath.basename += "-dev";
+        }
+      })
+    )
+    .pipe(gulp.dest(outDir))
+);
+
+const fingerprints = {};
+
+gulp.task("build-translation-fingerprints", () => {
+  // Fingerprint full file of each language
+  const files = fs.readdirSync(fullDir);
+
+  for (let i = 0; i < files.length; i++) {
+    fingerprints[files[i].split(".")[0]] = {
+      // In dev we create fake hashes
+      hash: env.isProdBuild()
+        ? crypto
+            .createHash("md5")
+            .update(fs.readFileSync(path.join(fullDir, files[i]), "utf-8"))
+            .digest("hex")
+        : "dev",
+    };
+  }
+
+  // In dev we create the file with the fake hash in the filename
+  if (env.isProdBuild()) {
+    mapFiles(outDir, ".json", (filename) => {
+      const parsed = path.parse(filename);
+
+      // nl.json -> nl-<hash>.json
+      if (!(parsed.name in fingerprints)) {
+        throw new Error(`Unable to find hash for ${filename}`);
+      }
+
+      fs.renameSync(
+        filename,
+        `${parsed.dir}/${parsed.name}-${fingerprints[parsed.name].hash}${
+          parsed.ext
+        }`
+      );
+    });
+  }
+
+  const stream = source("translationFingerprints.json");
+  stream.write(JSON.stringify(fingerprints));
+  process.nextTick(() => stream.end());
+  return stream.pipe(vinylBuffer()).pipe(gulp.dest(workDir));
+});
+
+gulp.task("build-translation-fragment-supervisor", () =>
+  gulp
+    .src(fullDir + "/*.json")
+    .pipe(transform((data) => data.supervisor))
+    .pipe(
+      rename((filePath) => {
+        // In dev we create the file with the fake hash in the filename
+        if (!env.isProdBuild()) {
+          filePath.basename += "-dev";
+        }
+      })
+    )
+    .pipe(gulp.dest(workDir + "/supervisor"))
+);
+
+gulp.task("build-translation-flatten-supervisor", () =>
+  gulp
+    .src(workDir + "/supervisor/*.json")
+    .pipe(
+      transform((data) =>
+        // Polymer.AppLocalizeBehavior requires flattened json
+        flatten(data)
      )
-      .pipe(minify())
-      .pipe(hashFilename())
-      .pipe(
-        rename((filePath) => {
-          if (filePath.dirname === "core") {
-            filePath.dirname = "";
+    )
+    .pipe(gulp.dest(outDir))
+);
+
+gulp.task("build-translation-write-metadata", () =>
+  gulp
+    .src(
+      [
+        path.join(paths.translations_src, "translationMetadata.json"),
+        workDir + "/testMetadata.json",
+        workDir + "/translationFingerprints.json",
+      ],
+      { allowEmpty: true }
+    )
+    .pipe(merge({}))
+    .pipe(
+      transform((data) => {
+        const newData = {};
+        Object.entries(data).forEach(([key, value]) => {
+          // Filter out translations without native name.
+          if (value.nativeName) {
+            newData[key] = value;
+          } else {
+            // eslint-disable-next-line no-console
+            console.warn(
+              `Skipping language ${key}. Native name was not translated.`
+            );
          }
-        })
-      )
-      .pipe(gulp.dest(outDir));
-  })
+        });
+        return newData;
+      })
+    )
+    .pipe(
+      transform((data) => ({
+        fragments: TRANSLATION_FRAGMENTS,
+        translations: data,
+      }))
+    )
+    .pipe(rename("translationMetadata.json"))
+    .pipe(gulp.dest(workDir))
 );
-tasks.push(taskName);

-taskName = "build-translation-fingerprints";
 gulp.task(
-  taskName,
-  gulp.series("build-flattened-translations", function() {
-    return gulp
-      .src(outDir + "/**/*.json")
-      .pipe(
-        rename({
-          extname: "",
-        })
-      )
-      .pipe(
-        hash({
-          algorithm: "md5",
-          hashLength: 32,
-          template: "<%= name %>.json",
-        })
-      )
-      .pipe(hash.manifest("translationFingerprints.json"))
-      .pipe(
-        transform(function(data) {
-          // After generating fingerprints of our translation files, consolidate
-          // all translation fragment fingerprints under the translation name key
-          const newData = {};
-          Object.entries(data).forEach(([key, value]) => {
-            const [path, _md5] = key.rsplit("-", 1);
-            // let translation = key;
-            let translation = path;
-            const parts = translation.split("/");
-            if (parts.length === 2) {
-              translation = parts[1];
-            }
-            if (!(translation in newData)) {
-              newData[translation] = {
-                fingerprints: {},
-              };
-            }
-            newData[translation].fingerprints[path] = value;
-          });
-          return newData;
-        })
-      )
-      .pipe(gulp.dest(workDir));
-  })
+  "create-translations",
+  gulp.series(
+    env.isProdBuild() ? (done) => done() : "create-test-translation",
+    "build-master-translation",
+    "build-merged-translations",
+    gulp.parallel(...splitTasks),
+    "build-flattened-translations"
+  )
 );
-tasks.push(taskName);

-taskName = "build-translations";
 gulp.task(
-  taskName,
-  gulp.series("build-translation-fingerprints", function() {
-    return gulp
-      .src(
-        [
-          "src/translations/translationMetadata.json",
-          workDir + "/testMetadata.json",
-          workDir + "/translationFingerprints.json",
-        ],
-        { allowEmpty: true }
-      )
-      .pipe(merge({}))
-      .pipe(
-        transform(function(data) {
-          const newData = {};
-          Object.entries(data).forEach(([key, value]) => {
-            // Filter out translations without native name.
-            if (data[key].nativeName) {
-              newData[key] = data[key];
-            } else {
-              console.warn(
-                `Skipping language ${key}. Native name was not translated.`
-              );
-            }
-            if (data[key]) newData[key] = value;
-          });
-          return newData;
-        })
-      )
-      .pipe(
-        transform((data) => ({
-          fragments: TRANSLATION_FRAGMENTS,
-          translations: data,
-        }))
-      )
-      .pipe(rename("translationMetadata.json"))
-      .pipe(gulp.dest(workDir));
-  })
+  "build-translations",
+  gulp.series(
+    "clean-translations",
+    "ensure-translations-build-dir",
+    "create-translations",
+    "build-translation-fingerprints",
+    "build-translation-write-metadata"
+  )
 );
-tasks.push(taskName);

-module.exports = tasks;
+gulp.task(
+  "build-supervisor-translations",
+  gulp.series(
+    "clean-translations",
+    "ensure-translations-build-dir",
+    "build-master-translation",
+    "build-merged-translations",
+    "build-translation-fragment-supervisor",
+    "build-translation-flatten-supervisor",
+    "build-translation-fingerprints",
+    "build-translation-write-metadata"
+  )
+);
@@ -0,0 +1,11 @@
+// Tasks to run Rollup
+const gulp = require("gulp");
+const { startDevServer } = require("@web/dev-server");
+
+gulp.task("wds-watch-app", () => {
+  startDevServer({
+    config: {
+      watch: true,
+    },
+  });
+});
@@ -1,8 +1,11 @@
+/* eslint-disable @typescript-eslint/no-var-requires */
 // Tasks to run webpack.
+const fs = require("fs");
 const gulp = require("gulp");
 const webpack = require("webpack");
 const WebpackDevServer = require("webpack-dev-server");
 const log = require("fancy-log");
+const path = require("path");
 const paths = require("../paths");
 const {
  createAppConfig,
@@ -17,153 +20,168 @@ const bothBuilds = (createConfigFunc, params) => [
  createConfigFunc({ ...params, latestBuild: false }),
 ];

-const runDevServer = ({
+const isWsl =
+  fs.existsSync("/proc/version") &&
+  fs
+    .readFileSync("/proc/version", "utf-8")
+    .toLocaleLowerCase()
+    .includes("microsoft");
+
+/**
+ * @param {{
+ *   compiler: import("webpack").Compiler,
+ *   contentBase: string,
+ *   port: number,
+ *   listenHost?: string
+ * }}
+ */
+const runDevServer = async ({
  compiler,
  contentBase,
  port,
  listenHost = "localhost",
-}) =>
-  new WebpackDevServer(compiler, {
-    open: true,
-    watchContentBase: true,
-    contentBase,
-  }).listen(port, listenHost, function(err) {
-    if (err) {
-      throw err;
-    }
-    // Server listening
-    log("[webpack-dev-server]", `http://localhost:${port}`);
-  });
+}) => {
+  const server = new WebpackDevServer(
+    {
+      open: true,
+      host: listenHost,
+      port,
+      static: {
+        directory: contentBase,
+        watch: true,
+      },
+    },
+    compiler
+  );

-const handler = (done) => (err, stats) => {
+  await server.start();
+  // Server listening
+  log("[webpack-dev-server]", `Project is running at http://localhost:${port}`);
+};
+
+const doneHandler = (done) => (err, stats) => {
  if (err) {
-    console.log(err.stack || err);
+    log.error(err.stack || err);
    if (err.details) {
-      console.log(err.details);
+      log.error(err.details);
    }
    return;
  }

-  log(`Build done @ ${new Date().toLocaleTimeString()}`);
-
  if (stats.hasErrors() || stats.hasWarnings()) {
+    // eslint-disable-next-line no-console
    console.log(stats.toString("minimal"));
  }

+  log(`Build done @ ${new Date().toLocaleTimeString()}`);
+
  if (done) {
    done();
  }
 };

+const prodBuild = (conf) =>
+  new Promise((resolve) => {
+    webpack(
+      conf,
+      // Resolve promise when done. Because we pass a callback, webpack closes itself
+      doneHandler(resolve)
+    );
+  });
+
 gulp.task("webpack-watch-app", () => {
-  // we are not calling done, so this command will run forever
-  webpack(bothBuilds(createAppConfig, { isProdBuild: false })).watch(
-    {},
-    handler()
+  // This command will run forever because we don't close compiler
+  webpack(
+    process.env.ES5
+      ? bothBuilds(createAppConfig, { isProdBuild: false })
+      : createAppConfig({ isProdBuild: false, latestBuild: true })
+  ).watch({ poll: isWsl }, doneHandler());
+  gulp.watch(
+    path.join(paths.translations_src, "en.json"),
+    gulp.series("create-translations", "copy-translations-app")
  );
 });

-gulp.task(
-  "webpack-prod-app",
-  () =>
-    new Promise((resolve) =>
-      webpack(
-        bothBuilds(createAppConfig, { isProdBuild: true }),
-        handler(resolve)
-      )
-    )
+gulp.task("webpack-prod-app", () =>
+  prodBuild(
+    bothBuilds(createAppConfig, {
+      isProdBuild: true,
+    })
+  )
 );

-gulp.task("webpack-dev-server-demo", () => {
+gulp.task("webpack-dev-server-demo", () =>
  runDevServer({
    compiler: webpack(bothBuilds(createDemoConfig, { isProdBuild: false })),
-    contentBase: paths.demo_root,
+    contentBase: paths.demo_output_root,
    port: 8090,
-  });
-});
-
-gulp.task(
-  "webpack-prod-demo",
-  () =>
-    new Promise((resolve) =>
-      webpack(
-        bothBuilds(createDemoConfig, {
-          isProdBuild: true,
-        }),
-        handler(resolve)
-      )
-    )
+  })
 );

-gulp.task("webpack-dev-server-cast", () => {
+gulp.task("webpack-prod-demo", () =>
+  prodBuild(
+    bothBuilds(createDemoConfig, {
+      isProdBuild: true,
+    })
+  )
+);
+
+gulp.task("webpack-dev-server-cast", () =>
  runDevServer({
    compiler: webpack(bothBuilds(createCastConfig, { isProdBuild: false })),
-    contentBase: paths.cast_root,
+    contentBase: paths.cast_output_root,
    port: 8080,
    // Accessible from the network, because that's how Cast hits it.
    listenHost: "0.0.0.0",
-  });
-});
+  })
+);

-gulp.task(
-  "webpack-prod-cast",
-  () =>
-    new Promise((resolve) =>
-      webpack(
-        bothBuilds(createCastConfig, {
-          isProdBuild: true,
-        }),
-
-        handler(resolve)
-      )
-    )
+gulp.task("webpack-prod-cast", () =>
+  prodBuild(
+    bothBuilds(createCastConfig, {
+      isProdBuild: true,
+    })
+  )
 );

 gulp.task("webpack-watch-hassio", () => {
-  // we are not calling done, so this command will run forever
+  // This command will run forever because we don't close compiler
  webpack(
    createHassioConfig({
      isProdBuild: false,
-      latestBuild: false,
+      latestBuild: true,
    })
-  ).watch({}, handler());
+  ).watch({ ignored: /build/, poll: isWsl }, doneHandler());
+
+  gulp.watch(
+    path.join(paths.translations_src, "en.json"),
+    gulp.series("build-supervisor-translations", "copy-translations-supervisor")
+  );
 });

-gulp.task(
-  "webpack-prod-hassio",
-  () =>
-    new Promise((resolve) =>
-      webpack(
-        createHassioConfig({
-          isProdBuild: true,
-          latestBuild: false,
-        }),
-        handler(resolve)
-      )
-    )
+gulp.task("webpack-prod-hassio", () =>
+  prodBuild(
+    bothBuilds(createHassioConfig, {
+      isProdBuild: true,
+    })
+  )
 );

-gulp.task("webpack-dev-server-gallery", () => {
+gulp.task("webpack-dev-server-gallery", () =>
  runDevServer({
-    compiler: webpack(
-      createGalleryConfig({ latestBuild: true, isProdBuild: false })
-    ),
-    contentBase: paths.gallery_root,
+    // We don't use the es5 build, but the dev server will fuck up the publicPath if we don't
+    compiler: webpack(bothBuilds(createGalleryConfig, { isProdBuild: false })),
+    contentBase: paths.gallery_output_root,
    port: 8100,
-  });
-});
-
-gulp.task(
-  "webpack-prod-gallery",
-  () =>
-    new Promise((resolve) =>
-      webpack(
-        createGalleryConfig({
-          isProdBuild: true,
-          latestBuild: true,
-        }),
-
-        handler(resolve)
-      )
-    )
+    listenHost: "0.0.0.0",
+  })
+);
+
+gulp.task("webpack-prod-gallery", () =>
+  prodBuild(
+    createGalleryConfig({
+      isProdBuild: true,
+      latestBuild: true,
+    })
+  )
 );
@@ -1,32 +1,48 @@
-var path = require("path");
+/* eslint-disable @typescript-eslint/no-var-requires */
+const path = require("path");

 module.exports = {
  polymer_dir: path.resolve(__dirname, ".."),

  build_dir: path.resolve(__dirname, "../build"),
-  root: path.resolve(__dirname, "../hass_frontend"),
-  static: path.resolve(__dirname, "../hass_frontend/static"),
-  output: path.resolve(__dirname, "../hass_frontend/frontend_latest"),
-  output_es5: path.resolve(__dirname, "../hass_frontend/frontend_es5"),
+  app_output_root: path.resolve(__dirname, "../hass_frontend"),
+  app_output_static: path.resolve(__dirname, "../hass_frontend/static"),
+  app_output_latest: path.resolve(
+    __dirname,
+    "../hass_frontend/frontend_latest"
+  ),
+  app_output_es5: path.resolve(__dirname, "../hass_frontend/frontend_es5"),

  demo_dir: path.resolve(__dirname, "../demo"),
-  demo_root: path.resolve(__dirname, "../demo/dist"),
-  demo_static: path.resolve(__dirname, "../demo/dist/static"),
-  demo_output: path.resolve(__dirname, "../demo/dist/frontend_latest"),
+  demo_output_root: path.resolve(__dirname, "../demo/dist"),
+  demo_output_static: path.resolve(__dirname, "../demo/dist/static"),
+  demo_output_latest: path.resolve(__dirname, "../demo/dist/frontend_latest"),
  demo_output_es5: path.resolve(__dirname, "../demo/dist/frontend_es5"),

  cast_dir: path.resolve(__dirname, "../cast"),
-  cast_root: path.resolve(__dirname, "../cast/dist"),
-  cast_static: path.resolve(__dirname, "../cast/dist/static"),
-  cast_output: path.resolve(__dirname, "../cast/dist/frontend_latest"),
+  cast_output_root: path.resolve(__dirname, "../cast/dist"),
+  cast_output_static: path.resolve(__dirname, "../cast/dist/static"),
+  cast_output_latest: path.resolve(__dirname, "../cast/dist/frontend_latest"),
  cast_output_es5: path.resolve(__dirname, "../cast/dist/frontend_es5"),

  gallery_dir: path.resolve(__dirname, "../gallery"),
-  gallery_root: path.resolve(__dirname, "../gallery/dist"),
-  gallery_output: path.resolve(__dirname, "../gallery/dist/frontend_latest"),
-  gallery_static: path.resolve(__dirname, "../gallery/dist/static"),
+  gallery_build: path.resolve(__dirname, "../gallery/build"),
+  gallery_output_root: path.resolve(__dirname, "../gallery/dist"),
+  gallery_output_latest: path.resolve(
+    __dirname,
+    "../gallery/dist/frontend_latest"
+  ),
+  gallery_output_static: path.resolve(__dirname, "../gallery/dist/static"),

  hassio_dir: path.resolve(__dirname, "../hassio"),
-  hassio_root: path.resolve(__dirname, "../hassio/build"),
-  hassio_publicPath: "/api/hassio/app/",
+  hassio_output_root: path.resolve(__dirname, "../hassio/build"),
+  hassio_output_static: path.resolve(__dirname, "../hassio/build/static"),
+  hassio_output_latest: path.resolve(
+    __dirname,
+    "../hassio/build/frontend_latest"
+  ),
+  hassio_output_es5: path.resolve(__dirname, "../hassio/build/frontend_es5"),
+  hassio_publicPath: "/api/hassio/app",
+
+  translations_src: path.resolve(__dirname, "../src/translations"),
 };
@@ -0,0 +1 @@
+[]
@@ -0,0 +1,14 @@
+module.exports = function (opts = {}) {
+  const dontHash = opts.dontHash || new Set();
+
+  return {
+    name: "dont-hash",
+    renderChunk(_code, chunk, _options) {
+      if (!chunk.isEntry || !dontHash.has(chunk.name)) {
+        return null;
+      }
+      chunk.fileName = `${chunk.name}.js`;
+      return null;
+    },
+  };
+};
@@ -0,0 +1,24 @@
+module.exports = function (userOptions = {}) {
+  // Files need to be absolute paths.
+  // This only works if the file has no exports
+  // and only is imported for its side effects
+  const files = userOptions.files || [];
+
+  if (files.length === 0) {
+    return {
+      name: "ignore",
+    };
+  }
+
+  return {
+    name: "ignore",
+
+    load(id) {
+      return files.some((toIgnorePath) => id.startsWith(toIgnorePath))
+        ? {
+            code: "",
+          }
+        : null;
+    },
+  };
+};
@@ -0,0 +1,34 @@
+const url = require("url");
+
+const defaultOptions = {
+  publicPath: "",
+};
+
+module.exports = function (userOptions = {}) {
+  const options = { ...defaultOptions, ...userOptions };
+
+  return {
+    name: "manifest",
+    generateBundle(outputOptions, bundle) {
+      const manifest = {};
+
+      for (const chunk of Object.values(bundle)) {
+        if (!chunk.isEntry) {
+          continue;
+        }
+        // Add js extension to mimic Webpack manifest.
+        manifest[`${chunk.name}.js`] = url.resolve(
+          options.publicPath,
+          chunk.fileName
+        );
+      }
+
+      this.emitFile({
+        type: "asset",
+        source: JSON.stringify(manifest, undefined, 2),
+        name: "manifest.json",
+        fileName: "manifest.json",
+      });
+    },
+  };
+};
@@ -0,0 +1,149 @@
+// Worker plugin
+// Each worker will include all of its dependencies
+// instead of relying on an importer.
+
+// Forked from v.1.4.1
+// https://github.com/surma/rollup-plugin-off-main-thread
+/**
+ * Copyright 2018 Google Inc. All Rights Reserved.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+const rollup = require("rollup");
+const path = require("path");
+const MagicString = require("magic-string");
+
+const defaultOpts = {
+  // A RegExp to find `new Workers()` calls. The second capture group _must_
+  // capture the provided file name without the quotes.
+  workerRegexp: /new Worker\((["'])(.+?)\1(,[^)]+)?\)/g,
+  plugins: ["node-resolve", "commonjs", "babel", "terser", "ignore"],
+};
+
+async function getBundledWorker(workerPath, rollupOptions) {
+  const bundle = await rollup.rollup({
+    ...rollupOptions,
+    input: {
+      worker: workerPath,
+    },
+  });
+  const { output } = await bundle.generate({
+    // Generates cleanest output, we shouldn't have any imports/exports
+    // that would be incompatible with ES5.
+    format: "es",
+    // We should not export anything. This will fail build if we are.
+    exports: "none",
+  });
+
+  let code;
+
+  for (const chunkOrAsset of output) {
+    if (chunkOrAsset.name === "worker") {
+      code = chunkOrAsset.code;
+    } else if (chunkOrAsset.type !== "asset") {
+      throw new Error("Unexpected extra output");
+    }
+  }
+
+  return code;
+}
+
+module.exports = function (opts = {}) {
+  opts = { ...defaultOpts, ...opts };
+
+  let rollupOptions;
+  let refIds;
+
+  return {
+    name: "hass-worker",
+
+    async buildStart(options) {
+      refIds = {};
+      rollupOptions = {
+        plugins: options.plugins.filter((plugin) =>
+          opts.plugins.includes(plugin.name)
+        ),
+      };
+    },
+
+    async transform(code, id) {
+      // Copy the regexp as they are stateful and this hook is async.
+      const workerRegexp = new RegExp(
+        opts.workerRegexp.source,
+        opts.workerRegexp.flags
+      );
+      if (!workerRegexp.test(code)) {
+        return;
+      }
+
+      const ms = new MagicString(code);
+      // Reset the regexp
+      workerRegexp.lastIndex = 0;
+      while (true) {
+        const match = workerRegexp.exec(code);
+        if (!match) {
+          break;
+        }
+
+        const workerFile = match[2];
+        let optionsObject = {};
+        // Parse the optional options object
+        if (match[3] && match[3].length > 0) {
+          // FIXME: ooooof!
+          optionsObject = new Function(`return ${match[3].slice(1)};`)();
+        }
+        delete optionsObject.type;
+
+        if (!new RegExp("^.*/").test(workerFile)) {
+          this.warn(
+            `Paths passed to the Worker constructor must be relative or absolute, i.e. start with /, ./ or ../ (just like dynamic import!). Ignoring "${workerFile}".`
+          );
+          continue;
+        }
+
+        // Find worker file and store it as a chunk with ID prefixed for our loader
+        const resolvedWorkerFile = (await this.resolve(workerFile, id)).id;
+        let chunkRefId;
+        if (resolvedWorkerFile in refIds) {
+          chunkRefId = refIds[resolvedWorkerFile];
+        } else {
+          this.addWatchFile(resolvedWorkerFile);
+          const source = await getBundledWorker(
+            resolvedWorkerFile,
+            rollupOptions
+          );
+          chunkRefId = refIds[resolvedWorkerFile] = this.emitFile({
+            name: path.basename(resolvedWorkerFile),
+            source,
+            type: "asset",
+          });
+        }
+
+        const workerParametersStartIndex = match.index + "new Worker(".length;
+        const workerParametersEndIndex =
+          match.index + match[0].length - ")".length;
+
+        ms.overwrite(
+          workerParametersStartIndex,
+          workerParametersEndIndex,
+          `import.meta.ROLLUP_FILE_URL_${chunkRefId}, ${JSON.stringify(
+            optionsObject
+          )}`
+        );
+      }
+
+      return {
+        code: ms.toString(),
+        map: ms.generateMap({ hires: true }),
+      };
+    },
+  };
+};
@@ -0,0 +1,139 @@
+/* eslint-disable @typescript-eslint/no-var-requires */
+const path = require("path");
+
+const commonjs = require("@rollup/plugin-commonjs");
+const resolve = require("@rollup/plugin-node-resolve");
+const json = require("@rollup/plugin-json");
+const babel = require("@rollup/plugin-babel").babel;
+const replace = require("@rollup/plugin-replace");
+const visualizer = require("rollup-plugin-visualizer");
+const { string } = require("rollup-plugin-string");
+const { terser } = require("rollup-plugin-terser");
+const manifest = require("./rollup-plugins/manifest-plugin");
+const worker = require("./rollup-plugins/worker-plugin");
+const dontHashPlugin = require("./rollup-plugins/dont-hash-plugin");
+const ignore = require("./rollup-plugins/ignore-plugin");
+
+const bundle = require("./bundle");
+const paths = require("./paths");
+
+const extensions = [".js", ".ts"];
+
+/**
+ * @param {Object} arg
+ * @param { import("rollup").InputOption } arg.input
+ */
+const createRollupConfig = ({
+  entry,
+  outputPath,
+  defineOverlay,
+  isProdBuild,
+  latestBuild,
+  isStatsBuild,
+  publicPath,
+  dontHash,
+  isWDS,
+}) => ({
+  /**
+   * @type { import("rollup").InputOptions }
+   */
+  inputOptions: {
+    input: entry,
+    // Some entry points contain no JavaScript. This setting silences a warning about that.
+    // https://rollupjs.org/guide/en/#preserveentrysignatures
+    preserveEntrySignatures: false,
+    plugins: [
+      ignore({
+        files: bundle.emptyPackages({ latestBuild }),
+      }),
+      resolve({
+        extensions,
+        preferBuiltins: false,
+        browser: true,
+        rootDir: paths.polymer_dir,
+      }),
+      commonjs(),
+      json(),
+      babel({
+        ...bundle.babelOptions({ latestBuild }),
+        extensions,
+        babelHelpers: isWDS ? "inline" : "bundled",
+      }),
+      string({
+        // Import certain extensions as strings
+        include: [path.join(paths.polymer_dir, "node_modules/**/*.css")],
+      }),
+      replace(bundle.definedVars({ isProdBuild, latestBuild, defineOverlay })),
+      !isWDS &&
+        manifest({
+          publicPath,
+        }),
+      !isWDS && worker(),
+      !isWDS && dontHashPlugin({ dontHash }),
+      !isWDS && isProdBuild && terser(bundle.terserOptions(latestBuild)),
+      !isWDS &&
+        isStatsBuild &&
+        visualizer({
+          // https://github.com/btd/rollup-plugin-visualizer#options
+          open: true,
+          sourcemap: true,
+        }),
+    ].filter(Boolean),
+  },
+  /**
+   * @type { import("rollup").OutputOptions }
+   */
+  outputOptions: {
+    // https://rollupjs.org/guide/en/#outputdir
+    dir: outputPath,
+    // https://rollupjs.org/guide/en/#outputformat
+    format: latestBuild ? "es" : "systemjs",
+    // https://rollupjs.org/guide/en/#outputexternallivebindings
+    externalLiveBindings: false,
+    // https://rollupjs.org/guide/en/#outputentryfilenames
+    // https://rollupjs.org/guide/en/#outputchunkfilenames
+    // https://rollupjs.org/guide/en/#outputassetfilenames
+    entryFileNames:
+      isProdBuild && !isStatsBuild ? "[name]-[hash].js" : "[name].js",
+    chunkFileNames: isProdBuild && !isStatsBuild ? "c.[hash].js" : "[name].js",
+    assetFileNames: isProdBuild && !isStatsBuild ? "a.[hash].js" : "[name].js",
+    // https://rollupjs.org/guide/en/#outputsourcemap
+    sourcemap: isProdBuild ? true : "inline",
+  },
+});
+
+const createAppConfig = ({ isProdBuild, latestBuild, isStatsBuild, isWDS }) =>
+  createRollupConfig(
+    bundle.config.app({
+      isProdBuild,
+      latestBuild,
+      isStatsBuild,
+      isWDS,
+    })
+  );
+
+const createDemoConfig = ({ isProdBuild, latestBuild, isStatsBuild }) =>
+  createRollupConfig(
+    bundle.config.demo({
+      isProdBuild,
+      latestBuild,
+      isStatsBuild,
+    })
+  );
+
+const createCastConfig = ({ isProdBuild, latestBuild }) =>
+  createRollupConfig(bundle.config.cast({ isProdBuild, latestBuild }));
+
+const createHassioConfig = ({ isProdBuild, latestBuild }) =>
+  createRollupConfig(bundle.config.hassio({ isProdBuild, latestBuild }));
+
+const createGalleryConfig = ({ isProdBuild, latestBuild }) =>
+  createRollupConfig(bundle.config.gallery({ isProdBuild, latestBuild }));
+
+module.exports = {
+  createAppConfig,
+  createDemoConfig,
+  createCastConfig,
+  createHassioConfig,
+  createGalleryConfig,
+};
@@ -0,0 +1,17 @@
+/* eslint-disable @typescript-eslint/no-var-requires */
+const path = require("path");
+const fs = require("fs");
+
+// Helper function to map recursively over files in a folder and it's subfolders
+module.exports.mapFiles = function mapFiles(startPath, filter, mapFunc) {
+  const files = fs.readdirSync(startPath);
+  for (let i = 0; i < files.length; i++) {
+    const filename = path.join(startPath, files[i]);
+    const stat = fs.lstatSync(filename);
+    if (stat.isDirectory()) {
+      mapFiles(filename, filter, mapFunc);
+    } else if (filename.indexOf(filter) >= 0) {
+      mapFunc(filename);
+    }
+  }
+};
@@ -1,255 +1,183 @@
+/* eslint-disable @typescript-eslint/no-var-requires */
 const webpack = require("webpack");
-const fs = require("fs");
 const path = require("path");
 const TerserPlugin = require("terser-webpack-plugin");
-const WorkboxPlugin = require("workbox-webpack-plugin");
-const ManifestPlugin = require("webpack-manifest-plugin");
+const { WebpackManifestPlugin } = require("webpack-manifest-plugin");
 const paths = require("./paths.js");
-const { babelLoaderConfig } = require("./babel.js");
+const bundle = require("./bundle.js");
+const log = require("fancy-log");
+const WebpackBar = require("webpackbar");

-let version = fs
-  .readFileSync(path.resolve(paths.polymer_dir, "setup.py"), "utf8")
-  .match(/\d{8}\.\d+/);
-if (!version) {
-  throw Error("Version not found");
+class LogStartCompilePlugin {
+  ignoredFirst = false;
+
+  apply(compiler) {
+    compiler.hooks.beforeCompile.tap("LogStartCompilePlugin", () => {
+      if (!this.ignoredFirst) {
+        this.ignoredFirst = true;
+        return;
+      }
+      log("Changes detected. Starting compilation");
+    });
+  }
 }
-version = version[0];

 const createWebpackConfig = ({
  entry,
-  outputRoot,
+  outputPath,
+  publicPath,
  defineOverlay,
  isProdBuild,
  latestBuild,
  isStatsBuild,
+  isHassioBuild,
+  dontHash,
 }) => {
+  if (!dontHash) {
+    dontHash = new Set();
+  }
+  const ignorePackages = bundle.ignorePackages({ latestBuild });
  return {
    mode: isProdBuild ? "production" : "development",
-    devtool: isProdBuild ? "source-map" : "inline-cheap-module-source-map",
+    target: ["web", latestBuild ? "es2017" : "es5"],
+    devtool: isProdBuild
+      ? "cheap-module-source-map"
+      : "eval-cheap-module-source-map",
    entry,
+    node: false,
    module: {
      rules: [
-        babelLoaderConfig({ latestBuild }),
        {
-          test: /\.css$/,
-          use: "raw-loader",
-        },
-        {
-          test: /\.(html)$/,
+          test: /\.m?js$|\.ts$/,
          use: {
-            loader: "html-loader",
+            loader: "babel-loader",
            options: {
-              exportAsEs6Default: true,
+              ...bundle.babelOptions({ latestBuild }),
+              cacheDirectory: !isProdBuild,
+              cacheCompression: false,
            },
          },
        },
+        {
+          test: /\.css$/,
+          type: "asset/source",
+        },
      ],
    },
    optimization: {
      minimizer: [
        new TerserPlugin({
-          cache: true,
          parallel: true,
          extractComments: true,
-          sourceMap: true,
-          terserOptions: {
-            safari10: true,
-            ecma: latestBuild ? undefined : 5,
-          },
+          terserOptions: bundle.terserOptions(latestBuild),
        }),
      ],
+      moduleIds: isProdBuild && !isStatsBuild ? "deterministic" : "named",
+      chunkIds: isProdBuild && !isStatsBuild ? "deterministic" : "named",
    },
    plugins: [
-      new ManifestPlugin(),
-      new webpack.DefinePlugin({
-        __DEV__: !isProdBuild,
-        __BUILD__: JSON.stringify(latestBuild ? "latest" : "es5"),
-        __VERSION__: JSON.stringify(version),
-        __DEMO__: false,
-        __STATIC_PATH__: "/static/",
-        "process.env.NODE_ENV": JSON.stringify(
-          isProdBuild ? "production" : "development"
-        ),
-        ...defineOverlay,
+      new WebpackBar({ fancy: !isProdBuild }),
+      new WebpackManifestPlugin({
+        // Only include the JS of entrypoints
+        filter: (file) => file.isInitial && !file.name.endsWith(".map"),
+      }),
+      new webpack.DefinePlugin(
+        bundle.definedVars({ isProdBuild, latestBuild, defineOverlay })
+      ),
+      new webpack.IgnorePlugin({
+        checkResource(resource, context) {
+          // Only use ignore to intercept imports that we don't control
+          // inside node_module dependencies.
+          if (
+            !context.includes("/node_modules/") ||
+            // calling define.amd will call require("!!webpack amd options")
+            resource.startsWith("!!webpack") ||
+            // loaded by webpack dev server but doesn't exist.
+            resource === "webpack/hot"
+          ) {
+            return false;
+          }
+          let fullPath;
+          try {
+            fullPath = resource.startsWith(".")
+              ? path.resolve(context, resource)
+              : require.resolve(resource);
+          } catch (err) {
+            // eslint-disable-next-line no-console
+            console.error(
+              "Error in Home Assistant ignore plugin",
+              resource,
+              context
+            );
+            throw err;
+          }
+
+          return ignorePackages.some((toIgnorePath) =>
+            fullPath.startsWith(toIgnorePath)
+          );
+        },
      }),
-      // Ignore moment.js locales
-      new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/),
-      // Color.js is bloated, it contains all color definitions for all material color sets.
      new webpack.NormalModuleReplacementPlugin(
-        /@polymer\/paper-styles\/color\.js$/,
-        path.resolve(paths.polymer_dir, "src/util/empty.js")
-      ),
-      // Ignore roboto pointing at CDN. We use local font-roboto-local.
-      new webpack.NormalModuleReplacementPlugin(
-        /@polymer\/font-roboto\/roboto\.js$/,
-        path.resolve(paths.polymer_dir, "src/util/empty.js")
-      ),
-      // Ignore mwc icons pointing at CDN.
-      new webpack.NormalModuleReplacementPlugin(
-        /@material\/mwc-icon\/mwc-icon-font\.js$/,
+        new RegExp(
+          bundle.emptyPackages({ latestBuild, isHassioBuild }).join("|")
+        ),
        path.resolve(paths.polymer_dir, "src/util/empty.js")
      ),
+      !isProdBuild && new LogStartCompilePlugin(),
    ].filter(Boolean),
    resolve: {
-      extensions: [".ts", ".js", ".json", ".tsx"],
+      extensions: [".ts", ".js", ".json"],
      alias: {
-        react: "preact-compat",
-        "react-dom": "preact-compat",
-        // Not necessary unless you consume a module using `createClass`
-        "create-react-class": "preact-compat/lib/create-react-class",
-        // Not necessary unless you consume a module requiring `react-dom-factories`
-        "react-dom-factories": "preact-compat/lib/react-dom-factories",
+        "lit/decorators$": "lit/decorators.js",
+        "lit/directive$": "lit/directive.js",
+        "lit/directives/until$": "lit/directives/until.js",
+        "lit/directives/class-map$": "lit/directives/class-map.js",
+        "lit/directives/style-map$": "lit/directives/style-map.js",
+        "lit/directives/if-defined$": "lit/directives/if-defined.js",
+        "lit/directives/guard$": "lit/directives/guard.js",
+        "lit/directives/cache$": "lit/directives/cache.js",
+        "lit/directives/repeat$": "lit/directives/repeat.js",
+        "lit/polyfill-support$": "lit/polyfill-support.js",
      },
    },
    output: {
      filename: ({ chunk }) => {
-        const dontHash = new Set();
-
-        if (!isProdBuild || dontHash.has(chunk.name)) {
+        if (!isProdBuild || isStatsBuild || dontHash.has(chunk.name)) {
          return `${chunk.name}.js`;
        }
        return `${chunk.name}.${chunk.hash.substr(0, 8)}.js`;
      },
      chunkFilename:
-        isProdBuild && !isStatsBuild
-          ? "chunk.[chunkhash].js"
-          : "[name].chunk.js",
-      path: path.resolve(
-        outputRoot,
-        latestBuild ? "frontend_latest" : "frontend_es5"
-      ),
-      publicPath: latestBuild ? "/frontend_latest/" : "/frontend_es5/",
-      // For workerize loader
+        isProdBuild && !isStatsBuild ? "[chunkhash:8].js" : "[id].chunk.js",
+      path: outputPath,
+      publicPath,
+      // To silence warning in worker plugin
      globalObject: "self",
    },
+    experiments: {
+      topLevelAwait: true,
+    },
  };
 };

-const createAppConfig = ({ isProdBuild, latestBuild, isStatsBuild }) => {
-  const config = createWebpackConfig({
-    entry: {
-      app: "./src/entrypoints/app.ts",
-      authorize: "./src/entrypoints/authorize.ts",
-      onboarding: "./src/entrypoints/onboarding.ts",
-      core: "./src/entrypoints/core.ts",
-      compatibility: "./src/entrypoints/compatibility.ts",
-      "custom-panel": "./src/entrypoints/custom-panel.ts",
-      "hass-icons": "./src/entrypoints/hass-icons.ts",
-    },
-    outputRoot: paths.root,
-    isProdBuild,
-    latestBuild,
-    isStatsBuild,
-  });
+const createAppConfig = ({ isProdBuild, latestBuild, isStatsBuild }) =>
+  createWebpackConfig(
+    bundle.config.app({ isProdBuild, latestBuild, isStatsBuild })
+  );

-  if (latestBuild) {
-    // Create an object mapping browser urls to their paths during build
-    const translationMetadata = require("../build-translations/translationMetadata.json");
-    const workBoxTranslationsTemplatedURLs = {};
-    const englishFP = translationMetadata.translations.en.fingerprints;
-    Object.keys(englishFP).forEach((key) => {
-      workBoxTranslationsTemplatedURLs[
-        `/static/translations/${englishFP[key]}`
-      ] = `build-translations/output/${key}.json`;
-    });
+const createDemoConfig = ({ isProdBuild, latestBuild, isStatsBuild }) =>
+  createWebpackConfig(
+    bundle.config.demo({ isProdBuild, latestBuild, isStatsBuild })
+  );

-    config.plugins.push(
-      new WorkboxPlugin.InjectManifest({
-        swSrc: "./src/entrypoints/service-worker-hass.js",
-        swDest: "service_worker.js",
-        importWorkboxFrom: "local",
-        include: [/\.js$/],
-        templatedURLs: {
-          ...workBoxTranslationsTemplatedURLs,
-          "/static/icons/favicon-192x192.png":
-            "public/icons/favicon-192x192.png",
-          "/static/fonts/roboto/Roboto-Light.woff2":
-            "node_modules/roboto-fontface/fonts/roboto/Roboto-Light.woff2",
-          "/static/fonts/roboto/Roboto-Medium.woff2":
-            "node_modules/roboto-fontface/fonts/roboto/Roboto-Medium.woff2",
-          "/static/fonts/roboto/Roboto-Regular.woff2":
-            "node_modules/roboto-fontface/fonts/roboto/Roboto-Regular.woff2",
-          "/static/fonts/roboto/Roboto-Bold.woff2":
-            "node_modules/roboto-fontface/fonts/roboto/Roboto-Bold.woff2",
-        },
-      })
-    );
-  }
+const createCastConfig = ({ isProdBuild, latestBuild }) =>
+  createWebpackConfig(bundle.config.cast({ isProdBuild, latestBuild }));

-  return config;
-};
+const createHassioConfig = ({ isProdBuild, latestBuild }) =>
+  createWebpackConfig(bundle.config.hassio({ isProdBuild, latestBuild }));

-const createDemoConfig = ({ isProdBuild, latestBuild, isStatsBuild }) => {
-  return createWebpackConfig({
-    entry: {
-      main: path.resolve(paths.demo_dir, "src/entrypoint.ts"),
-      compatibility: path.resolve(
-        paths.polymer_dir,
-        "src/entrypoints/compatibility.ts"
-      ),
-    },
-    outputRoot: paths.demo_root,
-    defineOverlay: {
-      __VERSION__: JSON.stringify(`DEMO-${version}`),
-      __DEMO__: true,
-    },
-    isProdBuild,
-    latestBuild,
-    isStatsBuild,
-  });
-};
-
-const createCastConfig = ({ isProdBuild, latestBuild }) => {
-  const entry = {
-    launcher: path.resolve(paths.cast_dir, "src/launcher/entrypoint.ts"),
-  };
-
-  if (latestBuild) {
-    entry.receiver = path.resolve(paths.cast_dir, "src/receiver/entrypoint.ts");
-  }
-
-  return createWebpackConfig({
-    entry,
-    outputRoot: paths.cast_root,
-    isProdBuild,
-    latestBuild,
-  });
-};
-
-const createHassioConfig = ({ isProdBuild, latestBuild }) => {
-  if (latestBuild) {
-    throw new Error("Hass.io does not support latest build!");
-  }
-  const config = createWebpackConfig({
-    entry: {
-      entrypoint: path.resolve(paths.hassio_dir, "src/entrypoint.js"),
-    },
-    outputRoot: "",
-    isProdBuild,
-    latestBuild,
-  });
-
-  config.output.path = paths.hassio_root;
-  config.output.publicPath = paths.hassio_publicPath;
-
-  return config;
-};
-
-const createGalleryConfig = ({ isProdBuild, latestBuild }) => {
-  if (!latestBuild) {
-    throw new Error("Gallery only supports latest build!");
-  }
-  const config = createWebpackConfig({
-    entry: {
-      entrypoint: path.resolve(paths.gallery_dir, "src/entrypoint.js"),
-    },
-    outputRoot: paths.gallery_root,
-    isProdBuild,
-    latestBuild,
-  });
-
-  return config;
-};
+const createGalleryConfig = ({ isProdBuild, latestBuild }) =>
+  createWebpackConfig(bundle.config.gallery({ isProdBuild, latestBuild }));

 module.exports = {
  createAppConfig,
@@ -0,0 +1,10 @@
+const rollup = require("../build-scripts/rollup.js");
+const env = require("../build-scripts/env.js");
+
+const config = rollup.createCastConfig({
+  isProdBuild: env.isProdBuild(),
+  latestBuild: true,
+  isStatsBuild: env.isStatsBuild(),
+});
+
+module.exports = { ...config.inputOptions, output: config.outputOptions };
@@ -37,18 +37,21 @@
  <body>
    <%= renderTemplate('_js_base') %>

-    <script type="module" crossorigin="use-credentials">
-      import "<%= latestLauncherJS %>";
+    <script>
+      import("<%= latestLauncherJS %>");
+      window.latestJS = true;
    </script>

-    <script nomodule>
-      (function() {
-        // // Safari 10.1 supports type=module but ignores nomodule, so we add this check.
-        if (!isS101) {
-          _ls("/static/polyfills/custom-elements-es5-adapter.js");
+    <script>
+      if (!window.latestJS) {
+        <% if (useRollup) { %>
+          _ls("/static/js/s.min.js").onload = function() {
+            System.import("<%= es5LauncherJS %>");
+          };
+        <% } else { %>
          _ls("<%= es5LauncherJS %>");
-        }
-      })();
+        <% } %>
+      }
    </script>

    <hc-layout subtitle="FAQ">
@@ -136,7 +139,7 @@
          Your authentication credentials or Home Assistant url are never sent
          to the Cloud. You can validate this behavior in
          <a
-            href="https://github.com/home-assistant/home-assistant-polymer/tree/dev/cast"
+            href="https://github.com/home-assistant/frontend/tree/dev/cast"
            target="_blank"
            >the source code</a
          >.
@@ -209,13 +212,8 @@
          Chromecast is a technology developed by Google, and is available on:
        </p>
        <ul>
-          <li>Google Chrome (all platforms except on iOS)</li>
-          <li>
-            Microsoft Edge (all platforms,
-            <a href="https://www.microsoftedgeinsider.com" target="_blank"
-              >dev and canary builds only</a
-            >)
-          </li>
+          <li>Google Chrome (all platforms except iOS)</li>
+          <li>Microsoft Edge (all platforms)</li>
        </ul>
      </div>

@@ -248,7 +246,7 @@ http:

    <script>
      var _gaq = [["_setAccount", "UA-57927901-9"], ["_trackPageview"]];
-      (function(d, t) {
+      (function (d, t) {
        var g = d.createElement(t),
          s = d.getElementsByTagName(t)[0];
        g.src =
@@ -28,18 +28,21 @@

    <hc-connect></hc-connect>

-    <script type="module" crossorigin="use-credentials">
-      import "<%= latestLauncherJS %>";
+    <script>
+      import("<%= latestLauncherJS %>");
+      window.latestJS = true;
    </script>

-    <script nomodule>
-      (function() {
-        // // Safari 10.1 supports type=module but ignores nomodule, so we add this check.
-        if (!isS101) {
-          _ls("/static/polyfills/custom-elements-es5-adapter.js");
+    <script>
+      if (!window.latestJS) {
+        <% if (useRollup) { %>
+          _ls("/static/js/s.min.js").onload = function() {
+            System.import("<%= es5LauncherJS %>");
+          };
+        <% } else { %>
          _ls("<%= es5LauncherJS %>");
-        }
-      })();
+        <% } %>
+      }
    </script>
    <script>
    (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <script src="//www.gstatic.com/cast/sdk/libs/caf_receiver/v3/cast_receiver_framework.js"></script>
+    <style>
+      body {
+        --logo-image: url('https://www.home-assistant.io/images/home-assistant-logo.svg');
+        --logo-repeat: no-repeat;
+        --playback-logo-image: url('https://www.home-assistant.io/images/home-assistant-logo.svg');
+        --theme-hue: 200;
+        --progress-color: #03a9f4;
+        --splash-image: url('https://home-assistant.io/images/cast/splash.png');
+        --splash-size: cover;
+        --background-color: #41bdf5;
+      }
+    </style>
+    <script>
+      var _gaq=[['_setAccount','UA-57927901-10'],['_trackPageview']];
+      (function(d,t){var g=d.createElement(t),s=d.getElementsByTagName(t)[0];
+      g.src=('https:'==location.protocol?'//ssl':'//www')+'.google-analytics.com/ga.js';
+      s.parentNode.insertBefore(g,s)}(document,'script'));
+    </script>
+  </head>
+  <body>
+    <%= renderTemplate('_js_base') %>
+
+    <cast-media-player></cast-media-player>
+
+    <script>
+      import("<%= latestMediaJS %>");
+      window.latestJS = true;
+    </script>
+
+    <script>
+      if (!window.latestJS) {
+        <% if (useRollup) { %>
+          _ls("/static/js/s.min.js").onload = function() {
+            System.import("<%= es5MediaJS %>");
+          };
+        <% } else { %>
+          _ls("<%= es5MediaJS %>");
+        <% } %>
+      }
+    </script>
+  </body>
+</html>
@@ -1,5 +1,4 @@
+import "../../../src/resources/safari-14-attachshadow-patch";
 import "../../../src/resources/ha-style";
 import "../../../src/resources/roboto";
-import "../../../src/components/ha-iconset-svg";
-import "../../../src/resources/hass-icons";
 import "./layout/hc-connect";
@@ -1,57 +1,54 @@
-import {
-  customElement,
-  LitElement,
-  property,
-  TemplateResult,
-  html,
-  CSSResult,
-  css,
-} from "lit-element";
-import { Connection, Auth } from "home-assistant-js-websocket";
-import "@polymer/iron-icon";
-import "@polymer/paper-listbox/paper-listbox";
+import "@material/mwc-button/mwc-button";
+import { mdiCast, mdiCastConnected } from "@mdi/js";
 import "@polymer/paper-item/paper-icon-item";
-import "../../../../src/components/ha-icon";
-import {
-  enableWrite,
-  askWrite,
-  saveTokens,
-} from "../../../../src/common/auth/token_storage";
-import {
-  ensureConnectedCastSession,
-  castSendShowLovelaceView,
-} from "../../../../src/cast/receiver_messages";
-import "../../../../src/layouts/loading-screen";
+import "@polymer/paper-listbox/paper-listbox";
+import { Auth, Connection } from "home-assistant-js-websocket";
+import { css, CSSResultGroup, html, LitElement, TemplateResult } from "lit";
+import { customElement, property, state } from "lit/decorators";
 import { CastManager } from "../../../../src/cast/cast_manager";
 import {
-  LovelaceConfig,
-  getLovelaceCollection,
-} from "../../../../src/data/lovelace";
-import "./hc-layout";
-import { generateDefaultViewConfig } from "../../../../src/panels/lovelace/common/generate-lovelace-config";
+  castSendShowLovelaceView,
+  ensureConnectedCastSession,
+} from "../../../../src/cast/receiver_messages";
+import {
+  askWrite,
+  enableWrite,
+  saveTokens,
+} from "../../../../src/common/auth/token_storage";
+import { atLeastVersion } from "../../../../src/common/config/version";
 import { toggleAttribute } from "../../../../src/common/dom/toggle_attribute";
+import "../../../../src/components/ha-icon";
+import "../../../../src/components/ha-svg-icon";
+import {
+  getLegacyLovelaceCollection,
+  getLovelaceCollection,
+  LovelaceConfig,
+} from "../../../../src/data/lovelace";
+import "../../../../src/layouts/hass-loading-screen";
+import { generateDefaultViewConfig } from "../../../../src/panels/lovelace/common/generate-lovelace-config";
+import "./hc-layout";

@customElement("hc-cast")
 class HcCast extends LitElement {
  @property() public auth!: Auth;
-  @property() public connection!: Connection;
-  @property() public castManager!: CastManager;
-  @property() private askWrite = false;
-  @property() private lovelaceConfig?: LovelaceConfig | null;

-  protected render(): TemplateResult | void {
+  @property() public connection!: Connection;
+
+  @property() public castManager!: CastManager;
+
+  @state() private askWrite = false;
+
+  @state() private lovelaceConfig?: LovelaceConfig | null;
+
+  protected render(): TemplateResult {
    if (this.lovelaceConfig === undefined) {
-      return html`
-        <loading-screen></loading-screen>>
-      `;
+      return html`<hass-loading-screen no-toolbar></hass-loading-screen>`;
    }

    const error =
      this.castManager.castState === "NO_DEVICES_AVAILABLE"
        ? html`
-            <p>
-              There were no suitable Chromecast devices to cast to found.
-            </p>
+            <p>There were no suitable Chromecast devices to cast to found.</p>
          `
        : undefined;

@@ -73,14 +70,12 @@ class HcCast extends LitElement {
            `
          : ""}
        ${error
-          ? html`
-              <div class="card-content">${error}</div>
-            `
+          ? html` <div class="card-content">${error}</div> `
          : !this.castManager.status
          ? html`
              <p class="center-item">
                <mwc-button raised @click=${this._handleLaunch}>
-                  <iron-icon icon="hass:cast"></iron-icon>
+                  <ha-svg-icon .path=${mdiCast}></ha-svg-icon>
                  Start Casting
                </mwc-button>
              </p>
@@ -118,7 +113,7 @@ class HcCast extends LitElement {
          ${this.castManager.status
            ? html`
                <mwc-button @click=${this._handleLaunch}>
-                  <iron-icon icon="hass:cast-connected"></iron-icon>
+                  <ha-svg-icon .path=${mdiCastConnected}></ha-svg-icon>
                  Manage
                </mwc-button>
              `
@@ -133,7 +128,9 @@ class HcCast extends LitElement {
  protected firstUpdated(changedProps) {
    super.firstUpdated(changedProps);

-    const llColl = getLovelaceCollection(this.connection);
+    const llColl = atLeastVersion(this.connection.haVersion, 0, 107)
+      ? getLovelaceCollection(this.connection)
+      : getLegacyLovelaceCollection(this.connection);
    // We first do a single refresh because we need to check if there is LL
    // configuration.
    llColl.refresh().then(
@@ -196,12 +193,12 @@ class HcCast extends LitElement {
      }
      this.connection.close();
      location.reload();
-    } catch (err) {
+    } catch (err: any) {
      alert("Unable to log out!");
    }
  }

-  static get styles(): CSSResult {
+  static get styles(): CSSResultGroup {
    return css`
      .center-item {
        display: flex;
@@ -238,7 +235,7 @@ class HcCast extends LitElement {
        color: var(--secondary-text-color);
      }

-      mwc-button iron-icon {
+      mwc-button ha-svg-icon {
        margin-right: 8px;
        height: 18px;
      }
@@ -1,35 +1,29 @@
-import {
-  LitElement,
-  customElement,
-  property,
-  TemplateResult,
-  html,
-  CSSResult,
-  css,
-} from "lit-element";
-import {
-  getAuth,
-  createConnection,
-  Auth,
-  getAuthOptions,
-  ERR_HASS_HOST_REQUIRED,
-  ERR_INVALID_HTTPS_TO_HTTP,
-  Connection,
-  ERR_CANNOT_CONNECT,
-  ERR_INVALID_AUTH,
-} from "home-assistant-js-websocket";
-import "@polymer/iron-icon";
 import "@material/mwc-button";
+import { mdiCastConnected, mdiCast } from "@mdi/js";
 import "@polymer/paper-input/paper-input";
+import {
+  Auth,
+  Connection,
+  createConnection,
+  ERR_CANNOT_CONNECT,
+  ERR_HASS_HOST_REQUIRED,
+  ERR_INVALID_AUTH,
+  ERR_INVALID_HTTPS_TO_HTTP,
+  getAuth,
+  getAuthOptions,
+} from "home-assistant-js-websocket";
+import { css, CSSResultGroup, html, LitElement, TemplateResult } from "lit";
+import { customElement, state } from "lit/decorators";
+import { CastManager, getCastManager } from "../../../../src/cast/cast_manager";
+import { castSendShowDemo } from "../../../../src/cast/receiver_messages";
 import {
  loadTokens,
  saveTokens,
 } from "../../../../src/common/auth/token_storage";
-import "../../../../src/layouts/loading-screen";
-import { CastManager, getCastManager } from "../../../../src/cast/cast_manager";
-import "./hc-layout";
-import { castSendShowDemo } from "../../../../src/cast/receiver_messages";
+import "../../../../src/components/ha-svg-icon";
+import "../../../../src/layouts/hass-loading-screen";
 import { registerServiceWorker } from "../../../../src/util/register-service-worker";
+import "./hc-layout";

 const seeFAQ = (qid) => html`
  See <a href="./faq.html${qid ? `#${qid}` : ""}">the FAQ</a> for more
@@ -60,17 +54,23 @@ const INTRO = html`

@customElement("hc-connect")
 export class HcConnect extends LitElement {
-  @property() private loading = false;
+  @state() private loading = false;
+
  // If we had stored credentials but we cannot connect,
  // show a screen asking retry or logout.
-  @property() private cannotConnect = false;
-  @property() private error?: string | TemplateResult;
-  @property() private auth?: Auth;
-  @property() private connection?: Connection;
-  @property() private castManager?: CastManager | null;
+  @state() private cannotConnect = false;
+
+  @state() private error?: string | TemplateResult;
+
+  @state() private auth?: Auth;
+
+  @state() private connection?: Connection;
+
+  @state() private castManager?: CastManager | null;
+
  private openDemo = false;

-  protected render(): TemplateResult | void {
+  protected render(): TemplateResult {
    if (this.cannotConnect) {
      const tokens = loadTokens();
      return html`
@@ -80,9 +80,7 @@ export class HcConnect extends LitElement {
          </div>
          <div class="card-actions">
            <a href="/">
-              <mwc-button>
-                Retry
-              </mwc-button>
+              <mwc-button> Retry </mwc-button>
            </a>
            <div class="spacer"></div>
            <mwc-button @click=${this._handleLogout}>Log out</mwc-button>
@@ -92,9 +90,7 @@ export class HcConnect extends LitElement {
    }

    if (this.castManager === undefined || this.loading) {
-      return html`
-        <loading-screen></loading-screen>
-      `;
+      return html` <hass-loading-screen no-toolbar></hass-loading-screen> `;
    }

    if (this.castManager === null) {
@@ -127,20 +123,16 @@ export class HcConnect extends LitElement {
                @keydown=${this._handleInputKeyDown}
              ></paper-input>
            </p>
-            ${this.error
-              ? html`
-                  <p class="error">${this.error}</p>
-                `
-              : ""}
+            ${this.error ? html` <p class="error">${this.error}</p> ` : ""}
          </div>
          <div class="card-actions">
            <mwc-button @click=${this._handleDemo}>
              Show Demo
-              <iron-icon
-                .icon=${this.castManager.castState === "CONNECTED"
-                  ? "hass:cast-connected"
-                  : "hass:cast"}
-              ></iron-icon>
+              <ha-svg-icon
+                .path=${this.castManager.castState === "CONNECTED"
+                  ? mdiCastConnected
+                  : mdiCast}
+              ></ha-svg-icon>
            </mwc-button>
            <div class="spacer"></div>
            <mwc-button @click=${this._handleConnect}>Authorize</mwc-button>
@@ -184,7 +176,7 @@ export class HcConnect extends LitElement {
        this.castManager = null;
      }
    );
-    registerServiceWorker(false);
+    registerServiceWorker(this, false);
  }

  private async _handleDemo() {
@@ -211,7 +203,8 @@ export class HcConnect extends LitElement {
    if (value === "") {
      this.error = "Please enter a Home Assistant URL.";
      return;
-    } else if (value.indexOf("://") === -1) {
+    }
+    if (value.indexOf("://") === -1) {
      this.error =
        "Please enter your full URL, including the protocol part (https://).";
      return;
@@ -220,7 +213,7 @@ export class HcConnect extends LitElement {
    let url: URL;
    try {
      url = new URL(value);
-    } catch (err) {
+    } catch (err: any) {
      this.error = "Invalid URL";
      return;
    }
@@ -248,7 +241,7 @@ export class HcConnect extends LitElement {
    try {
      this.loading = true;
      auth = await getAuth(options);
-    } catch (err) {
+    } catch (err: any) {
      if (init === "saved-tokens" && err === ERR_CANNOT_CONNECT) {
        this.cannotConnect = true;
        return;
@@ -267,7 +260,7 @@ export class HcConnect extends LitElement {

    try {
      conn = await createConnection({ auth });
-    } catch (err) {
+    } catch (err: any) {
      // In case of saved tokens, silently solve problems.
      if (init === "saved-tokens") {
        if (err === ERR_CANNOT_CONNECT) {
@@ -293,12 +286,12 @@ export class HcConnect extends LitElement {
    try {
      saveTokens(null);
      location.reload();
-    } catch (err) {
+    } catch (err: any) {
      alert("Unable to log out!");
    }
  }

-  static get styles(): CSSResult {
+  static get styles(): CSSResultGroup {
    return css`
      .card-content a {
        color: var(--primary-color);
@@ -315,7 +308,7 @@ export class HcConnect extends LitElement {
        color: darkred;
      }

-      mwc-button iron-icon {
+      mwc-button ha-svg-icon {
        margin-left: 8px;
      }

@@ -1,33 +1,29 @@
-import {
-  customElement,
-  LitElement,
-  TemplateResult,
-  html,
-  CSSResult,
-  css,
-  property,
-} from "lit-element";
 import {
  Auth,
  Connection,
-  HassUser,
  getUser,
+  HassUser,
 } from "home-assistant-js-websocket";
+import { css, CSSResultGroup, html, LitElement, TemplateResult } from "lit";
+import { customElement, property } from "lit/decorators";
 import "../../../../src/components/ha-card";

@customElement("hc-layout")
 class HcLayout extends LitElement {
  @property() public subtitle?: string | undefined;
+
  @property() public auth?: Auth;
+
  @property() public connection?: Connection;
+
  @property() public user?: HassUser;

-  protected render(): TemplateResult | void {
+  protected render(): TemplateResult {
    return html`
      <ha-card>
        <div class="layout">
          <img class="hero" src="/images/google-nest-hub.png" />
-          <div class="card-header">
+          <h1 class="card-header">
            Home Assistant Cast${this.subtitle ? ` – ${this.subtitle}` : ""}
            ${this.auth
              ? html`
@@ -37,26 +33,21 @@ class HcLayout extends LitElement {
                        this.auth.data.hassUrl.indexOf("//") + 2
                      )}</a
                    >
-                    ${this.user
-                      ? html`
-                          – ${this.user.name}
-                        `
-                      : ""}
+                    ${this.user ? html` – ${this.user.name} ` : ""}
                  </div>
                `
              : ""}
-          </div>
+          </h1>
          <slot></slot>
        </div>
      </ha-card>
      <div class="footer">
-        <a href="./faq.html">Frequently Asked Questions</a> – Found a bug? Let
-        @balloob know
-        <!-- <a
+        <a href="./faq.html">Frequently Asked Questions</a> – Found a bug?
+        <a
          href="https://github.com/home-assistant/home-assistant-polymer/issues"
          target="_blank"
          >Let us know!</a
-        > -->
+        >
      </div>
    `;
  }
@@ -71,7 +62,7 @@ class HcLayout extends LitElement {
    }
  }

-  static get styles(): CSSResult {
+  static get styles(): CSSResultGroup {
    return css`
      :host {
        display: flex;
@@ -100,8 +91,12 @@ class HcLayout extends LitElement {
        line-height: 32px;
        padding: 24px 16px 16px;
        display: block;
+        margin: 0;
      }

+      .hero {
+        border-radius: 4px 4px 0 0;
+      }
      .subtitle {
        font-size: 14px;
        color: var(--secondary-text-color);
@@ -0,0 +1,22 @@
+const castContext = cast.framework.CastReceiverContext.getInstance();
+
+const playerManager = castContext.getPlayerManager();
+
+playerManager.setMessageInterceptor(
+  cast.framework.messages.MessageType.LOAD,
+  (loadRequestData) => {
+    const media = loadRequestData.media;
+    // Special handling if it came from Google Assistant
+    if (media.entity) {
+      media.contentId = media.entity;
+      media.streamType = cast.framework.messages.StreamType.LIVE;
+      media.contentType = "application/vnd.apple.mpegurl";
+      // @ts-ignore
+      media.hlsVideoSegmentFormat =
+        cast.framework.messages.HlsVideoSegmentFormat.FMP4;
+    }
+    return loadRequestData;
+  }
+);
+
+castContext.start();
@@ -1 +1,2 @@
+/* eslint-disable no-undef */
 export const castContext = cast.framework.CastReceiverContext.getInstance();
@@ -1,4 +1,4 @@
-import { Entity, convertEntities } from "../../../../src/fake_data/entity";
+import { convertEntities, Entity } from "../../../../src/fake_data/entity";

 export const castDemoEntities: () => Entity[] = () =>
  convertEntities({
@@ -1,12 +1,12 @@
 import {
-  LovelaceConfig,
  LovelaceCardConfig,
+  LovelaceConfig,
 } from "../../../../src/data/lovelace";
 import { castContext } from "../cast_context";

 export const castDemoLovelace: () => LovelaceConfig = () => {
-  const touchSupported = castContext.getDeviceCapabilities()
-    .touch_input_supported;
+  const touchSupported =
+    castContext.getDeviceCapabilities().touch_input_supported;
  return {
    views: [
      {
@@ -1,41 +1,156 @@
+/* eslint-disable no-undef */
+import { CAST_NS } from "../../../src/cast/const";
+import { HassMessage } from "../../../src/cast/receiver_messages";
 import "../../../src/resources/custom-card-support";
 import { castContext } from "./cast_context";
-import { ReceivedMessage } from "./types";
-import { HassMessage } from "../../../src/cast/receiver_messages";
 import { HcMain } from "./layout/hc-main";
-import { CAST_NS } from "../../../src/cast/const";
+import { ReceivedMessage } from "./types";

-const controller = new HcMain();
-document.body.append(controller);
+const lovelaceController = new HcMain();
+document.body.append(lovelaceController);
+lovelaceController.addEventListener("cast-view-changed", (ev) => {
+  playDummyMedia(ev.detail.title);
+});
+
+const mediaPlayer = document.createElement("cast-media-player");
+mediaPlayer.style.display = "none";
+document.body.append(mediaPlayer);
+const playerStylesAdded = false;
+
+let controls: HTMLElement | null;
+
+const setTouchControlsVisibility = (visible: boolean) => {
+  if (!castContext.getDeviceCapabilities().touch_input_supported) {
+    return;
+  }
+  controls =
+    controls ||
+    (document.body.querySelector("touch-controls") as HTMLElement | null);
+  if (controls) {
+    controls.style.display = visible ? "initial" : "none";
+  }
+};
+
+let timeOut: number | undefined;
+
+const playDummyMedia = (viewTitle?: string) => {
+  const loadRequestData = new cast.framework.messages.LoadRequestData();
+  loadRequestData.autoplay = true;
+  loadRequestData.media = new cast.framework.messages.MediaInformation();
+  loadRequestData.media.contentId =
+    "https://cast.home-assistant.io/images/google-nest-hub.png";
+  loadRequestData.media.contentType = "image/jpeg";
+  loadRequestData.media.streamType = cast.framework.messages.StreamType.NONE;
+  const metadata = new cast.framework.messages.GenericMediaMetadata();
+  metadata.title = viewTitle;
+  loadRequestData.media.metadata = metadata;
+
+  loadRequestData.requestId = 0;
+  playerManager.load(loadRequestData);
+  if (timeOut) {
+    clearTimeout(timeOut);
+    timeOut = undefined;
+  }
+  if (castContext.getDeviceCapabilities().touch_input_supported) {
+    timeOut = window.setTimeout(() => playDummyMedia(viewTitle), 540000); // repeat every 9 minutes to keep it active (gets deactivated after 10 minutes)
+  }
+};
+
+const showLovelaceController = () => {
+  mediaPlayer.style.display = "none";
+  lovelaceController.style.display = "initial";
+  document.body.setAttribute("style", "overflow-y: auto !important");
+  setTouchControlsVisibility(false);
+};
+
+const showMediaPlayer = () => {
+  lovelaceController.style.display = "none";
+  mediaPlayer.style.display = "initial";
+  document.body.removeAttribute("style");
+  setTouchControlsVisibility(true);
+  if (!playerStylesAdded) {
+    const style = document.createElement("style");
+    style.innerHTML = `
+    body {
+      --logo-image: url('https://www.home-assistant.io/images/home-assistant-logo.svg');
+      --logo-repeat: no-repeat;
+      --playback-logo-image: url('https://www.home-assistant.io/images/home-assistant-logo.svg');
+      --theme-hue: 200;
+      --progress-color: #03a9f4;
+      --splash-image: url('https://home-assistant.io/images/cast/splash.png');
+      --splash-size: cover;
+      --background-color: #41bdf5;
+    }
+    `;
+    document.head.appendChild(style);
+  }
+};

 const options = new cast.framework.CastReceiverOptions();
 options.disableIdleTimeout = true;
 options.customNamespaces = {
-  // @ts-ignore
  [CAST_NS]: cast.framework.system.MessageType.JSON,
 };

-// The docs say we need to set options.touchScreenOptimizeApp = true
-// https://developers.google.com/cast/docs/caf_receiver/customize_ui#accessing_ui_controls
-// This doesn't work.
-// @ts-ignore
-options.touchScreenOptimizedApp = true;
-
-// The class reference say we can set a uiConfig in options to set it
-// https://developers.google.com/cast/docs/reference/caf_receiver/cast.framework.CastReceiverOptions#uiConfig
-// This doesn't work either.
-// @ts-ignore
-options.uiConfig = new cast.framework.ui.UiConfig();
-// @ts-ignore
-options.uiConfig.touchScreenOptimizedApp = true;
-
 castContext.addCustomMessageListener(
  CAST_NS,
  // @ts-ignore
  (ev: ReceivedMessage<HassMessage>) => {
+    // We received a show Lovelace command, stop media from playing, hide media player and show Lovelace controller
+    if (
+      playerManager.getPlayerState() !==
+      cast.framework.messages.PlayerState.IDLE
+    ) {
+      playerManager.stop();
+    } else {
+      showLovelaceController();
+    }
    const msg = ev.data;
    msg.senderId = ev.senderId;
-    controller.processIncomingMessage(msg);
+    lovelaceController.processIncomingMessage(msg);
+  }
+);
+
+const playerManager = castContext.getPlayerManager();
+
+playerManager.setMessageInterceptor(
+  cast.framework.messages.MessageType.LOAD,
+  (loadRequestData) => {
+    if (
+      loadRequestData.media.contentId ===
+      "https://cast.home-assistant.io/images/google-nest-hub.png"
+    ) {
+      return loadRequestData;
+    }
+    // We received a play media command, hide Lovelace and show media player
+    showMediaPlayer();
+    const media = loadRequestData.media;
+    // Special handling if it came from Google Assistant
+    if (media.entity) {
+      media.contentId = media.entity;
+      media.streamType = cast.framework.messages.StreamType.LIVE;
+      media.contentType = "application/vnd.apple.mpegurl";
+      // @ts-ignore
+      media.hlsVideoSegmentFormat =
+        cast.framework.messages.HlsVideoSegmentFormat.FMP4;
+    }
+    return loadRequestData;
+  }
+);
+
+playerManager.addEventListener(
+  cast.framework.events.EventType.MEDIA_STATUS,
+  (event) => {
+    if (
+      event.mediaStatus?.playerState ===
+        cast.framework.messages.PlayerState.IDLE &&
+      event.mediaStatus?.idleReason &&
+      event.mediaStatus?.idleReason !==
+        cast.framework.messages.IdleReason.INTERRUPTED
+    ) {
+      // media finished or stopped, return to default Lovelace
+      showLovelaceController();
+    }
  }
 );

@@ -1,22 +1,24 @@
-import { HassElement } from "../../../../src/state/hass-element";
-import "./hc-lovelace";
-import { customElement, TemplateResult, html, property } from "lit-element";
+import { html, TemplateResult } from "lit";
+import { customElement, property, state } from "lit/decorators";
+import { mockHistory } from "../../../../demo/src/stubs/history";
+import { LovelaceConfig } from "../../../../src/data/lovelace";
 import {
  MockHomeAssistant,
  provideHass,
 } from "../../../../src/fake_data/provide_hass";
+import { HassElement } from "../../../../src/state/hass-element";
 import { HomeAssistant } from "../../../../src/types";
-import { LovelaceConfig } from "../../../../src/data/lovelace";
 import { castDemoEntities } from "../demo/cast-demo-entities";
 import { castDemoLovelace } from "../demo/cast-demo-lovelace";
-import { mockHistory } from "../../../../demo/src/stubs/history";
+import "./hc-lovelace";

@customElement("hc-demo")
 class HcDemo extends HassElement {
-  @property() public lovelacePath!: string;
-  @property() private _lovelaceConfig?: LovelaceConfig;
+  @property({ attribute: false }) public lovelacePath!: string;

-  protected render(): TemplateResult | void {
+  @state() private _lovelaceConfig?: LovelaceConfig;
+
+  protected render(): TemplateResult {
    if (!this._lovelaceConfig) {
      return html``;
    }
@@ -28,12 +30,13 @@ class HcDemo extends HassElement {
      ></hc-lovelace>
    `;
  }
+
  protected firstUpdated(changedProps) {
    super.firstUpdated(changedProps);
-    this._initialize();
+    this._initializeHass();
  }

-  private async _initialize() {
+  private async _initializeHass() {
    const initial: Partial<MockHomeAssistant> = {
      // Override updateHass so that the correct hass lifecycle methods are called
      updateHass: (hassUpdate: Partial<HomeAssistant>) =>
@@ -1,20 +1,14 @@
-import {
-  LitElement,
-  TemplateResult,
-  html,
-  customElement,
-  CSSResult,
-  css,
-  property,
-} from "lit-element";
+import { css, CSSResultGroup, html, LitElement, TemplateResult } from "lit";
+import { customElement, property } from "lit/decorators";
 import { HomeAssistant } from "../../../../src/types";

@customElement("hc-launch-screen")
 class HcLaunchScreen extends LitElement {
-  @property() public hass?: HomeAssistant;
+  @property({ attribute: false }) public hass?: HomeAssistant;
+
  @property() public error?: string;

-  protected render(): TemplateResult | void {
+  protected render(): TemplateResult {
    return html`
      <div class="container">
        <img
@@ -22,17 +16,13 @@ class HcLaunchScreen extends LitElement {
        />
        <div class="status">
          ${this.hass ? "Connected" : "Not Connected"}
-          ${this.error
-            ? html`
-                <p>Error: ${this.error}</p>
-              `
-            : ""}
+          ${this.error ? html` <p>Error: ${this.error}</p> ` : ""}
        </div>
      </div>
    `;
  }

-  static get styles(): CSSResult {
+  static get styles(): CSSResultGroup {
    return css`
      :host {
        display: block;
@@ -1,28 +1,26 @@
-import {
-  LitElement,
-  TemplateResult,
-  html,
-  customElement,
-  CSSResult,
-  css,
-  property,
-} from "lit-element";
+import { css, CSSResultGroup, html, LitElement, TemplateResult } from "lit";
+import { customElement, property } from "lit/decorators";
+import { fireEvent } from "../../../../src/common/dom/fire_event";
 import { LovelaceConfig } from "../../../../src/data/lovelace";
-import "../../../../src/panels/lovelace/views/hui-view";
-import "../../../../src/panels/lovelace/views/hui-panel-view";
-import { HomeAssistant } from "../../../../src/types";
 import { Lovelace } from "../../../../src/panels/lovelace/types";
+import "../../../../src/panels/lovelace/views/hui-view";
+import { HomeAssistant } from "../../../../src/types";
 import "./hc-launch-screen";

+(window as any).loadCardHelpers = () =>
+  import("../../../../src/panels/lovelace/custom-card-helpers");
+
@customElement("hc-lovelace")
 class HcLovelace extends LitElement {
-  @property() public hass!: HomeAssistant;
+  @property({ attribute: false }) public hass!: HomeAssistant;

-  @property() public lovelaceConfig!: LovelaceConfig;
+  @property({ attribute: false }) public lovelaceConfig!: LovelaceConfig;

  @property() public viewPath?: string | number;

-  protected render(): TemplateResult | void {
+  @property() public urlPath: string | null = null;
+
+  protected render(): TemplateResult {
    const index = this._viewIndex;
    if (index === undefined) {
      return html`
@@ -34,28 +32,23 @@ class HcLovelace extends LitElement {
    }
    const lovelace: Lovelace = {
      config: this.lovelaceConfig,
+      rawConfig: this.lovelaceConfig,
      editMode: false,
+      urlPath: this.urlPath,
      enableFullEditMode: () => undefined,
      mode: "storage",
-      language: "en",
+      locale: this.hass.locale,
      saveConfig: async () => undefined,
+      deleteConfig: async () => undefined,
      setEditMode: () => undefined,
    };
-    return this.lovelaceConfig.views[index].panel
-      ? html`
-          <hui-panel-view
-            .hass=${this.hass}
-            .config=${this.lovelaceConfig.views[index]}
-          ></hui-panel-view>
-        `
-      : html`
-          <hui-view
-            .hass=${this.hass}
-            .lovelace=${lovelace}
-            .index=${index}
-            columns="2"
-          ></hui-view>
-        `;
+    return html`
+      <hui-view
+        .hass=${this.hass}
+        .lovelace=${lovelace}
+        .index=${index}
+      ></hui-view>
+    `;
  }

  protected updated(changedProps) {
@@ -65,13 +58,28 @@ class HcLovelace extends LitElement {
      const index = this._viewIndex;

      if (index !== undefined) {
+        const dashboardTitle = this.lovelaceConfig.title || this.urlPath;
+
+        const viewTitle =
+          this.lovelaceConfig.views[index].title ||
+          this.lovelaceConfig.views[index].path;
+
+        fireEvent(this, "cast-view-changed", {
+          title:
+            dashboardTitle || viewTitle
+              ? `${dashboardTitle || ""}${
+                  dashboardTitle && viewTitle ? ": " : ""
+                }${viewTitle || ""}`
+              : undefined,
+        });
+
        const configBackground =
          this.lovelaceConfig.views[index].background ||
          this.lovelaceConfig.background;

        if (configBackground) {
          (this.shadowRoot!.querySelector(
-            "hui-view, hui-panel-view"
+            "hui-view"
          ) as HTMLElement)!.style.setProperty(
            "--lovelace-background",
            configBackground
@@ -95,10 +103,11 @@ class HcLovelace extends LitElement {
    return undefined;
  }

-  static get styles(): CSSResult {
+  static get styles(): CSSResultGroup {
    return css`
      :host {
        min-height: 100vh;
+        height: 0;
        display: flex;
        flex-direction: column;
        box-sizing: border-box;
@@ -111,8 +120,15 @@ class HcLovelace extends LitElement {
  }
 }

+export interface CastViewChanged {
+  title: string | undefined;
+}
+
 declare global {
  interface HTMLElementTagNameMap {
    "hc-lovelace": HcLovelace;
  }
+  interface HASSDomEvents {
+    "cast-view-changed": CastViewChanged;
+  }
 }
@@ -1,37 +1,50 @@
 import {
-  getAuth,
  createConnection,
+  getAuth,
  UnsubscribeFunc,
 } from "home-assistant-js-websocket";
-import { customElement, TemplateResult, html, property } from "lit-element";
-import { HassElement } from "../../../../src/state/hass-element";
+import { html, TemplateResult } from "lit";
+import { customElement, state } from "lit/decorators";
+import { CAST_NS } from "../../../../src/cast/const";
 import {
-  HassMessage,
  ConnectMessage,
-  ShowLovelaceViewMessage,
  GetStatusMessage,
+  HassMessage,
  ShowDemoMessage,
+  ShowLovelaceViewMessage,
 } from "../../../../src/cast/receiver_messages";
 import {
-  LovelaceConfig,
-  getLovelaceCollection,
-} from "../../../../src/data/lovelace";
-import "./hc-launch-screen";
-import { castContext } from "../cast_context";
-import { CAST_NS } from "../../../../src/cast/const";
-import { ReceiverStatusMessage } from "../../../../src/cast/sender_messages";
-import { loadLovelaceResources } from "../../../../src/panels/lovelace/common/load-resources";
+  ReceiverErrorCode,
+  ReceiverErrorMessage,
+  ReceiverStatusMessage,
+} from "../../../../src/cast/sender_messages";
+import { atLeastVersion } from "../../../../src/common/config/version";
 import { isNavigationClick } from "../../../../src/common/dom/is-navigation-click";
+import {
+  fetchResources,
+  getLegacyLovelaceCollection,
+  getLovelaceCollection,
+  LegacyLovelaceConfig,
+  LovelaceConfig,
+} from "../../../../src/data/lovelace";
+import { loadLovelaceResources } from "../../../../src/panels/lovelace/common/load-resources";
+import { HassElement } from "../../../../src/state/hass-element";
+import { castContext } from "../cast_context";
+import "./hc-launch-screen";
+
+let resourcesLoaded = false;

@customElement("hc-main")
 export class HcMain extends HassElement {
-  @property() private _showDemo = false;
+  @state() private _showDemo = false;

-  @property() private _lovelaceConfig?: LovelaceConfig;
+  @state() private _lovelaceConfig?: LovelaceConfig;

-  @property() private _lovelacePath: string | number | null = null;
+  @state() private _lovelacePath: string | number | null = null;

-  @property() private _error?: string;
+  @state() private _error?: string;
+
+  @state() private _urlPath?: string | null;

  private _unsubLovelace?: UnsubscribeFunc;

@@ -45,24 +58,24 @@ export class HcMain extends HassElement {
    } else if (msg.type === "show_demo") {
      this._handleShowDemo(msg);
    } else {
-      // tslint:disable-next-line: no-console
+      // eslint-disable-next-line no-console
      console.warn("unknown msg type", msg);
    }
  }

-  protected render(): TemplateResult | void {
+  protected render(): TemplateResult {
    if (this._showDemo) {
-      return html`
-        <hc-demo .lovelacePath=${this._lovelacePath}></hc-demo>
-      `;
+      return html` <hc-demo .lovelacePath=${this._lovelacePath}></hc-demo> `;
    }

    if (
      !this._lovelaceConfig ||
      this._lovelacePath === null ||
      // Guard against part of HA not being loaded yet.
-      (this.hass &&
-        (!this.hass.states || !this.hass.config || !this.hass.services))
+      !this.hass ||
+      !this.hass.states ||
+      !this.hass.config ||
+      !this.hass.services
    ) {
      return html`
        <hc-launch-screen
@@ -76,6 +89,8 @@ export class HcMain extends HassElement {
        .hass=${this.hass}
        .lovelaceConfig=${this._lovelaceConfig}
        .viewPath=${this._lovelacePath}
+        .urlPath=${this._urlPath}
+        @config-refresh=${this._generateLovelaceConfig}
      ></hc-lovelace>
    `;
  }
@@ -84,18 +99,21 @@ export class HcMain extends HassElement {
    super.firstUpdated(changedProps);
    import("../second-load");
    window.addEventListener("location-changed", () => {
-      if (location.pathname.startsWith("/lovelace/")) {
-        this._lovelacePath = location.pathname.substr(10);
+      const panelPath = `/${this._urlPath || "lovelace"}/`;
+      if (location.pathname.startsWith(panelPath)) {
+        this._lovelacePath = location.pathname.substr(panelPath.length);
        this._sendStatus();
      }
    });
    document.body.addEventListener("click", (ev) => {
+      const panelPath = `/${this._urlPath || "lovelace"}/`;
      const href = isNavigationClick(ev);
-      if (href && href.startsWith("/lovelace/")) {
-        this._lovelacePath = href.substr(10);
+      if (href && href.startsWith(panelPath)) {
+        this._lovelacePath = href.substr(panelPath.length);
        this._sendStatus();
      }
    });
+    this.addEventListener("dialog-closed", this._dialogClosed);
  }

  private _sendStatus(senderId?: string) {
@@ -107,7 +125,8 @@ export class HcMain extends HassElement {

    if (this.hass) {
      status.hassUrl = this.hass.auth.data.hassUrl;
-      status.lovelacePath = this._lovelacePath!;
+      status.lovelacePath = this._lovelacePath;
+      status.urlPath = this._urlPath;
    }

    if (senderId) {
@@ -119,6 +138,30 @@ export class HcMain extends HassElement {
    }
  }

+  private _sendError(
+    error_code: number,
+    error_message: string,
+    senderId?: string
+  ) {
+    const error: ReceiverErrorMessage = {
+      type: "receiver_error",
+      error_code,
+      error_message,
+    };
+
+    if (senderId) {
+      this.sendMessage(senderId, error);
+    } else {
+      for (const sender of castContext.getSenders()) {
+        this.sendMessage(sender.id, error);
+      }
+    }
+  }
+
+  private _dialogClosed = () => {
+    document.body.setAttribute("style", "overflow-y: auto !important");
+  };
+
  private async _handleGetStatusMessage(msg: GetStatusMessage) {
    this._sendStatus(msg.senderId!);
  }
@@ -136,15 +179,19 @@ export class HcMain extends HassElement {
          expires_in: 0,
        }),
      });
-    } catch (err) {
-      this._error = this._getErrorMessage(err);
+    } catch (err: any) {
+      const errorMessage = this._getErrorMessage(err);
+      this._error = errorMessage;
+      this._sendError(err, errorMessage);
      return;
    }
    let connection;
    try {
      connection = await createConnection({ auth });
-    } catch (err) {
-      this._error = this._getErrorMessage(err);
+    } catch (err: any) {
+      const errorMessage = this._getErrorMessage(err);
+      this._error = errorMessage;
+      this._sendError(err, errorMessage);
      return;
    }
    if (this.hass) {
@@ -156,15 +203,29 @@ export class HcMain extends HassElement {
  }

  private async _handleShowLovelaceMessage(msg: ShowLovelaceViewMessage) {
+    this._showDemo = false;
    // We should not get this command before we are connected.
    // Means a client got out of sync. Let's send status to them.
    if (!this.hass) {
      this._sendStatus(msg.senderId!);
      this._error = "Cannot show Lovelace because we're not connected.";
+      this._sendError(ReceiverErrorCode.NOT_CONNECTED, this._error);
      return;
    }
-    if (!this._unsubLovelace) {
-      const llColl = getLovelaceCollection(this.hass!.connection);
+    this._error = undefined;
+    if (msg.urlPath === "lovelace") {
+      msg.urlPath = null;
+    }
+    this._lovelacePath = msg.viewPath;
+    if (!this._unsubLovelace || this._urlPath !== msg.urlPath) {
+      this._urlPath = msg.urlPath;
+      this._lovelaceConfig = undefined;
+      if (this._unsubLovelace) {
+        this._unsubLovelace();
+      }
+      const llColl = atLeastVersion(this.hass.connection.haVersion, 0, 107)
+        ? getLovelaceCollection(this.hass.connection, msg.urlPath)
+        : getLegacyLovelaceCollection(this.hass.connection);
      // We first do a single refresh because we need to check if there is LL
      // configuration.
      try {
@@ -172,34 +233,53 @@ export class HcMain extends HassElement {
        this._unsubLovelace = llColl.subscribe((lovelaceConfig) =>
          this._handleNewLovelaceConfig(lovelaceConfig)
        );
-      } catch (err) {
+      } catch (err: any) {
+        if (
+          atLeastVersion(this.hass.connection.haVersion, 0, 107) &&
+          err.code !== "config_not_found"
+        ) {
+          // eslint-disable-next-line
+          console.log("Error fetching Lovelace configuration", err, msg);
+          this._error = `Error fetching Lovelace configuration: ${err.message}`;
+          this._sendError(ReceiverErrorCode.FETCH_CONFIG_FAILED, this._error);
+          return;
+        }
        // Generate a Lovelace config.
        this._unsubLovelace = () => undefined;
-        const {
-          generateLovelaceConfigFromHass,
-        } = await import("../../../../src/panels/lovelace/common/generate-lovelace-config");
-        this._handleNewLovelaceConfig(
-          await generateLovelaceConfigFromHass(this.hass!)
-        );
+        await this._generateLovelaceConfig();
      }
    }
-    this._showDemo = false;
-    this._lovelacePath = msg.viewPath;
-    if (castContext.getDeviceCapabilities().touch_input_supported) {
-      this._breakFree();
+    if (!resourcesLoaded) {
+      resourcesLoaded = true;
+      const resources = atLeastVersion(this.hass.connection.haVersion, 0, 107)
+        ? await fetchResources(this.hass!.connection)
+        : (this._lovelaceConfig as LegacyLovelaceConfig).resources;
+      if (resources) {
+        loadLovelaceResources(resources, this.hass!.auth.data.hassUrl);
+      }
    }
+
    this._sendStatus();
  }

+  private async _generateLovelaceConfig() {
+    const { generateLovelaceDashboardStrategy } = await import(
+      "../../../../src/panels/lovelace/strategies/get-strategy"
+    );
+    this._handleNewLovelaceConfig(
+      await generateLovelaceDashboardStrategy(
+        {
+          hass: this.hass!,
+          narrow: false,
+        },
+        "original-states"
+      )
+    );
+  }
+
  private _handleNewLovelaceConfig(lovelaceConfig: LovelaceConfig) {
-    castContext.setApplicationState(lovelaceConfig.title!);
+    castContext.setApplicationState(lovelaceConfig.title || "");
    this._lovelaceConfig = lovelaceConfig;
-    if (lovelaceConfig.resources) {
-      loadLovelaceResources(
-        lovelaceConfig.resources,
-        this.hass!.auth.data.hassUrl
-      );
-    }
  }

  private _handleShowDemo(_msg: ShowDemoMessage) {
@@ -207,9 +287,6 @@ export class HcMain extends HassElement {
      this._showDemo = true;
      this._lovelacePath = "overview";
      this._sendStatus();
-      if (castContext.getDeviceCapabilities().touch_input_supported) {
-        this._breakFree();
-      }
    });
  }

@@ -230,14 +307,6 @@ export class HcMain extends HassElement {
    }
  }

-  private _breakFree() {
-    const controls = document.body.querySelector("touch-controls");
-    if (controls) {
-      controls.remove();
-    }
-    document.body.setAttribute("style", "overflow-y: auto !important");
-  }
-
  private sendMessage(senderId: string, response: any) {
    castContext.sendCustomMessage(CAST_NS, senderId, response);
  }
@@ -1,5 +1,4 @@
 import "web-animations-js/web-animations-next-lite.min";
-import "../../../src/resources/hass-icons";
+import "../../../src/resources/ha-style";
 import "../../../src/resources/roboto";
-import "../../../src/components/ha-iconset-svg";
 import "./layout/hc-lovelace";
@@ -1,11 +1,8 @@
 const { createCastConfig } = require("../build-scripts/webpack.js");
-const { isProdBuild } = require("../build-scripts/env.js");
-
-// File just used for stats builds
-
-const latestBuild = true;
+const { isProdBuild, isStatsBuild } = require("../build-scripts/env.js");

 module.exports = createCastConfig({
-  isProdBuild,
-  latestBuild,
+  isProdBuild: isProdBuild(),
+  isStatsBuild: isStatsBuild(),
+  latestBuild: true,
 });
--- a/Show More
+++ b/Show More
@@ -1 +1 @@
 .1