Porting over change with auxiliary files

lib/webpack-manifest-plugin/helpers.js

@@ -1,4 +1,4 @@
-const { dirname, join } = require('path');
+const { dirname, join, basename } = require('path');
 
 const generateManifest = (compilation, files, { generate, seed = {} }) => {
   let result;
@@ -62,8 +62,24 @@ const reduceAssets = (files, asset, moduleAssets, assetTypeModuleAssets) => {
   });
 };
 
-const reduceChunk = (files, chunk, options) =>
-  Array.from(chunk.files).reduce((prev, path) => {
+const reduceChunk = (files, chunk, options, auxiliaryFiles) => {
+  // auxiliary files contain things like images, fonts AND, most
+  // importantly, other files like .map sourcemap files
+  // we modify the auxiliaryFiles so that we can add any of these
+  // to the manifest that was not added by another method
+  // (sourcemaps files are not added via any other method)
+  Array.from(chunk.auxiliaryFiles || []).forEach((auxiliaryFile) => {
+    auxiliaryFiles[auxiliaryFile] = {
+      path: auxiliaryFile,
+      name: basename(auxiliaryFile),
+      isInitial: false,
+      isChunk: false,
+      isAsset: true,
+      isModuleAsset: true
+    };
+  });
+
+  return Array.from(chunk.files).reduce((prev, path) => {
     let name = chunk.name ? chunk.name : null;
     // chunk name, or for nameless chunks, just map the files directly.
     name = name
@@ -82,6 +98,7 @@ const reduceChunk = (files, chunk, options) =>
       isModuleAsset: false
     });
   }, files);
+};
 
 const standardizeFilePaths = (file) => {
   const result = Object.assign({}, file);

lib/webpack-manifest-plugin/hooks.js

@@ -51,8 +51,9 @@ const emitHook = function emit(
 
   emitCountMap.set(manifestFileName, emitCount);
 
+  const auxiliaryFiles = {};
   let files = Array.from(compilation.chunks).reduce(
-    (prev, chunk) => reduceChunk(prev, chunk, options),
+    (prev, chunk) => reduceChunk(prev, chunk, options, auxiliaryFiles),
     []
   );
 
@@ -66,6 +67,17 @@ const emitHook = function emit(
       typeof emitCountMap.get(join(compiler.options.output.path, name)) === 'undefined'
   );
 
+  // auxiliary files are "extra" files that are probably already included
+  // in other ways. Loop over files and remove any from auxiliaryFiles
+  files.forEach((file) => {
+    delete auxiliaryFiles[file.path];
+  });
+  // if there are any auxiliaryFiles left, add them to the files
+  // this handles, specifically, sourcemaps
+  Object.keys(auxiliaryFiles).forEach((auxiliaryFile) => {
+    files = files.concat(auxiliaryFiles[auxiliaryFile]);
+  });
+
   files = files.map((file) => {
     const changes = {
       // Append optional basepath onto all references. This allows output path to be reflected in the manifest.
@@ -119,16 +131,16 @@ const normalModuleLoaderHook = ({ moduleAssets, assetTypeModuleAssets }, loaderC
   // the "emitFile" callback is never called on asset modules
   // so, we create a different map that can be used later in the "emit" hook
   if (['asset', 'asset/inline', 'asset/resource', 'asset/source'].includes(module.type)) {
-      // This takes the userRequest (which is an absolute path) and turns it into
-      // a relative path to the root context. This is done so that the string
-      // will match asset.info.sourceFilename in the emit hook.
-      let sourceFilename = relative(loaderContext.rootContext, module.userRequest);
-      // at this point, Windows paths use \ in their paths
-      // but in the emit hook, asset.info.sourceFilename fill have UNIX slashes
-      sourceFilename = sourceFilename.replace(/\\/g, '/');
-      Object.assign(assetTypeModuleAssets, {
-        [sourceFilename]: basename(module.userRequest),
-      });
+    // This takes the userRequest (which is an absolute path) and turns it into
+    // a relative path to the root context. This is done so that the string
+    // will match asset.info.sourceFilename in the emit hook.
+    let sourceFilename = relative(loaderContext.rootContext, module.userRequest);
+    // at this point, Windows paths use \ in their paths
+    // but in the emit hook, asset.info.sourceFilename fill have UNIX slashes
+    sourceFilename = sourceFilename.replace(/\\/g, '/');
+    Object.assign(assetTypeModuleAssets, {
+      [sourceFilename]: basename(module.userRequest)
+    });
   }
 
   // eslint-disable-next-line no-param-reassign