Make module types explicit and convert some to ESM (#15964)

build-scripts/gulp/demo.js

@@ -1,48 +0,0 @@
-// Run demo develop mode
-const gulp = require("gulp");
-
-const env = require("../env");
-
-require("./clean.js");
-require("./translations.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",
-  gulp.series(
-    async function setEnv() {
-      process.env.NODE_ENV = "development";
-    },
-    "clean-demo",
-    "translations-enable-merge-backend",
-    gulp.parallel(
-      "gen-icons-json",
-      "gen-index-demo-dev",
-      "build-translations",
-      "build-locale-data"
-    ),
-    "copy-static-demo",
-    env.useRollup() ? "rollup-dev-server-demo" : "webpack-dev-server-demo"
-  )
-);
-
-gulp.task(
-  "build-demo",
-  gulp.series(
-    async function setEnv() {
-      process.env.NODE_ENV = "production";
-    },
-    "clean-demo",
-    // 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",
-    env.useRollup() ? "rollup-prod-demo" : "webpack-prod-demo",
-    "gen-index-demo-prod"
-  )
-);