From 872e46a076c8d1096f3175dada4910ed6abde0dd Mon Sep 17 00:00:00 2001
From: Paulus Schoutsen <balloob@gmail.com>
Date: Sat, 23 May 2020 13:53:26 -0700
Subject: [PATCH] Exclude packages rollup (#6007)

---
 build-scripts/rollup-plugins/ignore-plugin.js | 51 +++++++++++++++++++
 build-scripts/rollup.js                       | 19 +++++--
 2 files changed, 65 insertions(+), 5 deletions(-)
 create mode 100644 build-scripts/rollup-plugins/ignore-plugin.js

diff --git a/build-scripts/rollup-plugins/ignore-plugin.js b/build-scripts/rollup-plugins/ignore-plugin.js
new file mode 100644
index 0000000000..4c6a7e61c0
--- /dev/null
+++ b/build-scripts/rollup-plugins/ignore-plugin.js
@@ -0,0 +1,51 @@
+const path = require("path");
+
+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",
+    resolveId(importee, importer) {
+      // Only use ignore to intercept imports that we don't control
+      // inside node_module dependencies.
+      if (
+        importee.endsWith("commonjsHelpers.js") ||
+        importee.endsWith("?commonjs-proxy") ||
+        !importer ||
+        !importer.includes("/node_modules/")
+      ) {
+        return null;
+      }
+      let fullPath;
+      try {
+        fullPath = importee.startsWith(".")
+          ? path.resolve(importee, importer)
+          : require.resolve(importee);
+      } catch (err) {
+        console.error("Error in ignore plugin", { importee, importer }, err);
+        throw err;
+      }
+
+      return files.some((toIgnorePath) => fullPath.startsWith(toIgnorePath))
+        ? fullPath
+        : null;
+    },
+
+    load(id) {
+      return files.some((toIgnorePath) => id.startsWith(toIgnorePath))
+        ? {
+            code: "",
+          }
+        : null;
+    },
+  };
+};
diff --git a/build-scripts/rollup.js b/build-scripts/rollup.js
index 7f7739990c..c27cee625a 100644
--- a/build-scripts/rollup.js
+++ b/build-scripts/rollup.js
@@ -11,8 +11,10 @@ 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"];
 
@@ -39,11 +41,18 @@ const createRollupConfig = ({
       // Some entry points contain no JavaScript. This setting silences a warning about that.
       // https://rollupjs.org/guide/en/#preserveentrysignatures
       preserveEntrySignatures: false,
-      external:
-        bundle.ignorePackages({ latestBuild }) +
-        bundle.emptyPackages({ latestBuild }),
       plugins: [
-        resolve({ extensions, preferBuiltins: false, browser: true }),
+        ignore({
+          files: bundle
+            .ignorePackages({ latestBuild })
+            .concat(bundle.emptyPackages({ latestBuild })),
+        }),
+        resolve({
+          extensions,
+          preferBuiltins: false,
+          browser: true,
+          rootDir: paths.polymer_dir,
+        }),
         commonjs({
           namedExports: {
             "js-yaml": ["safeDump", "safeLoad"],
@@ -57,7 +66,7 @@ const createRollupConfig = ({
         }),
         string({
           // Import certain extensions as strings
-          include: ["**/*.css"],
+          include: [path.join(paths.polymer_dir, "node_modules/**/*.css")],
         }),
         replace(
           bundle.definedVars({ isProdBuild, latestBuild, defineOverlay })