Merge remote-tracking branch 'upstream/main'

frontend/node_modules/script-ext-html-webpack-plugin/lib/async-chunk-resource-hints.js

@@ -0,0 +1,45 @@
+'use strict';
+
+const CHUNK_OPTIONS = ['all', 'async'];
+
+const getPublicPath = require('./common.js').getPublicPath;
+const createResourceHint = require('./resource-hints.js').createResourceHint;
+const matches = require('./common.js').matches;
+
+const addAsyncChunkResourceHints = (chunks, options) => {
+  const getRef = generateRef(options);
+  const hints = [];
+  chunks
+    .filter(chunk => !isInitial(chunk))
+    .reduce(
+      (files, chunk) => files.concat(chunk.files),
+      [])
+    .forEach(file => {
+      if (optionsMatch(options.preload, file)) {
+        hints.push(createResourceHint('preload', getRef(file)));
+      } else if (optionsMatch(options.prefetch, file)) {
+        hints.push(createResourceHint('prefetch', getRef(file)));
+      }
+    });
+  return hints;
+};
+
+const isInitial = chunk =>
+  chunk.canBeInitial
+    ? chunk.canBeInitial()
+    : chunk.isInitial
+      ? chunk.isInitial()
+      : chunk.isInitial;
+
+const optionsMatch = (option, file) => {
+  return matches(option.chunks, CHUNK_OPTIONS) && matches(file, option.test);
+};
+
+const generateRef = options => {
+  const publicPath = getPublicPath(options);
+  return publicPath
+    ? file => publicPath + file
+    : file => file;
+};
+
+module.exports = addAsyncChunkResourceHints;