feat(compiler): Add file dependencies

lib/compiler.js

@@ -33,11 +33,15 @@ class HtmlWebpackChildCompiler {
      * @type {Promise<{[templatePath: string]: { content: string, hash: string, entry: WebpackChunk }}>}
      */
     this.compilationPromise;
-
     /**
      * @type {Date}
      */
     this.compilationStarted;
+    /**
+     * All file dependencies of the child compiler
+     * @type {string[]}
+     */
+    this.fileDependencies = [];
   }
 
   /**
@@ -120,6 +124,10 @@ class HtmlWebpackChildCompiler {
         const compiledTemplates = entries
           ? extractHelperFilesFromCompilation(mainCompilation, childCompilation, outputOptions.filename, entries)
           : [];
+        // Extract file dependencies
+        if (entries) {
+          this.fileDependencies = extractFileDependenciesFilesFromCompilation(entries);
+        }
         // Reject the promise if the childCompilation contains error
         if (childCompilation && childCompilation.errors && childCompilation.errors.length) {
           const errorDetails = childCompilation.errors.map(error => error.message + (error.error ? ':\n' + error.error : '')).join('\n');
@@ -181,6 +189,21 @@ function extractHelperFilesFromCompilation (mainCompilation, childCompilation, f
   return helperContents;
 }
 
+/**
+ * Return all file dependencies from the given set of entries.
+ * @param {WebpackChunk[]} entries
+ * @returns {string[]}
+ */
+function extractFileDependenciesFilesFromCompilation (entries) {
+  const fileDependencies = new Map();
+  entries.forEach((entry) => {
+    entry.entryModule.buildInfo.fileDependencies.forEach((fileDependency) => {
+      fileDependencies.set(fileDependency, true);
+    });
+  });
+  return Array.from(fileDependencies.keys());
+}
+
 /**
  * @type {WeakMap<WebpackCompiler, HtmlWebpackChildCompiler>}}
  */