feat(@angular-devkit/build-angular): remove inlining of assets in css (#12027)

BREAKING CHANGE: Assets under 10Kib are not longer inlined in css

Author: alan-agius4

packages/angular_devkit/build_angular/src/angular-cli-files/models/webpack-configs/styles.ts

@@ -53,8 +53,6 @@ export function getStylesConfig(wco: WebpackConfigOptions) {
   const extraPlugins: any[] = [];
   const cssSourceMap = buildOptions.sourceMap;
 
-  // Maximum resource size to inline (KiB)
-  const maximumInlineSize = 10;
   // Determine hashing format.
   const hashFormat = getOutputHashFormat(buildOptions.outputHashing as string);
   // Convert absolute resource URLs to account for base-href and deploy-url.
@@ -134,18 +132,7 @@ export function getStylesConfig(wco: WebpackConfigOptions) {
               return `/${baseHref}/${deployUrl}/${url}`.replace(/\/\/+/g, '/');
             }
           }
-        },
-        {
-          // TODO: inline .cur if not supporting IE (use browserslist to check)
-          filter: (asset: PostcssUrlAsset) => {
-            return maximumInlineSize > 0 && !asset.hash && !asset.absolutePath.endsWith('.cur');
-          },
-          url: 'inline',
-          // NOTE: maxSize is in KB
-          maxSize: maximumInlineSize,
-          fallback: 'rebase',
-        },
-        { url: 'rebase' },
+        }
       ]),
       PostcssCliResources({
         deployUrl: loader.loaders[loader.loaderIndex].options.ident == 'extracted' ? '' : deployUrl,
@@ -196,7 +183,7 @@ export function getStylesConfig(wco: WebpackConfigOptions) {
 
     if (chunkNames.length > 0) {
       // Add plugin to remove hashes from lazy styles.
-      extraPlugins.push(new RemoveHashPlugin({ chunkNames, hashFormat}));
+      extraPlugins.push(new RemoveHashPlugin({ chunkNames, hashFormat }));
     }
   }
 
@@ -216,7 +203,8 @@ export function getStylesConfig(wco: WebpackConfigOptions) {
   const baseRules: webpack.Rule[] = [
     { test: /\.css$/, use: [] },
     {
-      test: /\.scss$|\.sass$/, use: [{
+      test: /\.scss$|\.sass$/,
+      use: [{
         loader: 'sass-loader',
         options: {
           implementation: dartSass,
@@ -229,7 +217,8 @@ export function getStylesConfig(wco: WebpackConfigOptions) {
       }]
     },
     {
-      test: /\.less$/, use: [{
+      test: /\.less$/,
+      use: [{
         loader: 'less-loader',
         options: {
           sourceMap: cssSourceMap,
@@ -239,7 +228,8 @@ export function getStylesConfig(wco: WebpackConfigOptions) {
       }]
     },
     {
-      test: /\.styl$/, use: [{
+      test: /\.styl$/,
+      use: [{
         loader: 'stylus-loader',
         options: {
           sourceMap: cssSourceMap,
@@ -251,7 +241,9 @@ export function getStylesConfig(wco: WebpackConfigOptions) {
 
   // load component css as raw strings
   const rules: webpack.Rule[] = baseRules.map(({ test, use }) => ({
-    exclude: globalStylePaths, test, use: [
+    exclude: globalStylePaths,
+    test,
+    use: [
       { loader: 'raw-loader' },
       {
         loader: 'postcss-loader',
@@ -306,16 +298,17 @@ export function getStylesConfig(wco: WebpackConfigOptions) {
   }
 
   if (buildOptions.extractCss) {
-    // extract global css from js files into own css file
     extraPlugins.push(
-      new MiniCssExtractPlugin({ filename: `[name]${hashFormat.extract}.css` }));
-    // suppress empty .js files in css only entry points
-    extraPlugins.push(new SuppressExtractedTextChunksWebpackPlugin());
+      // extract global css from js files into own css file
+      new MiniCssExtractPlugin({ filename: `[name]${hashFormat.extract}.css` }),
+      // suppress empty .js files in css only entry points
+      new SuppressExtractedTextChunksWebpackPlugin(),
+    );
   }
 
   return {
     entry: entryPoints,
     module: { rules },
-    plugins: [].concat(extraPlugins as any)
+    plugins: extraPlugins
   };
 }

packages/angular_devkit/build_angular/test/browser/styles_spec_large.ts

@@ -278,62 +278,6 @@ describe('Browser Builder styles', () => {
     });
   });
 
-  it('inlines resources', (done) => {
-    host.copyFile('src/spectrum.png', 'src/large.png');
-    host.writeMultipleFiles({
-      'src/styles.scss': `
-        h1 { background: url('./large.png'),
-                         linear-gradient(to bottom, #0e40fa 25%, #0654f4 75%); }
-        h2 { background: url('./small.svg'); }
-        p  { background: url(./small-id.svg#testID); }
-      `,
-      'src/app/app.component.css': `
-        h3 { background: url('../small.svg'); }
-        h4 { background: url("../large.png"); }
-      `,
-      'src/small.svg': imgSvg,
-      'src/small-id.svg': imgSvg,
-    });
-
-    const overrides = {
-      aot: true,
-      extractCss: true,
-      styles: [`src/styles.scss`],
-    };
-
-    runTargetSpec(host, browserTargetSpec, overrides).pipe(
-      tap((buildEvent) => expect(buildEvent.success).toBe(true)),
-      tap(() => {
-        const fileName = 'dist/styles.css';
-        const content = virtualFs.fileBufferToString(host.scopedSync().read(normalize(fileName)));
-        // Large image should not be inlined, and gradient should be there.
-        expect(content).toMatch(
-          /url\(['"]?large\.png['"]?\),\s+linear-gradient\(to bottom, #0e40fa 25%, #0654f4 75%\);/);
-        // Small image should be inlined.
-        expect(content).toMatch(/url\(\\?['"]data:image\/svg\+xml/);
-        // Small image with param should not be inlined.
-        expect(content).toMatch(/url\(['"]?small-id\.svg#testID['"]?\)/);
-      }),
-      tap(() => {
-        const fileName = 'dist/main.js';
-        const content = virtualFs.fileBufferToString(host.scopedSync().read(normalize(fileName)));
-        // Large image should not be inlined.
-        expect(content).toMatch(/url\((?:['"]|\\')?large\.png(?:['"]|\\')?\)/);
-        // Small image should be inlined.
-        expect(content).toMatch(/url\(\\?['"]data:image\/svg\+xml/);
-      }),
-      tap(() => {
-        expect(host.scopedSync().exists(normalize('dist/small.svg'))).toBe(false);
-        expect(host.scopedSync().exists(normalize('dist/large.png'))).toBe(true);
-        expect(host.scopedSync().exists(normalize('dist/small-id.svg'))).toBe(true);
-      }),
-      // TODO: find a way to check logger/output for warnings.
-      // if (stdout.match(/postcss-url: \.+: Can't read file '\.+', ignoring/)) {
-      //   throw new Error('Expected no postcss-url file read warnings.');
-      // }
-    ).toPromise().then(done, done.fail);
-  });
-
   it(`supports font-awesome imports`, (done) => {
     host.writeMultipleFiles({
       'src/styles.scss': `
@@ -407,8 +351,6 @@ describe('Browser Builder styles', () => {
         h3 { background: url('/assets/component-img-absolute.svg'); }
         h4 { background: url('../assets/component-img-relative.png'); }
       `,
-      // Use a small SVG for the absolute image to help validate that it is being referenced,
-      // because it is so small it would be inlined usually.
       'src/assets/global-img-absolute.svg': imgSvg,
       'src/assets/component-img-absolute.svg': imgSvg,
     });
@@ -427,12 +369,12 @@ describe('Browser Builder styles', () => {
         expect(styles).toContain(`url('global-img-relative.png')`);
         expect(main).toContain(`url('/assets/component-img-absolute.svg')`);
         expect(main).toContain(`url('component-img-relative.png')`);
-        expect(host.scopedSync().exists(normalize('dist/global-img-absolute.svg')))
-          .toBe(false);
+        expect(host.scopedSync().exists(normalize('dist/assets/global-img-absolute.svg')))
+          .toBe(true);
         expect(host.scopedSync().exists(normalize('dist/global-img-relative.png')))
           .toBe(true);
-        expect(host.scopedSync().exists(normalize('dist/component-img-absolute.svg')))
-          .toBe(false);
+        expect(host.scopedSync().exists(normalize('dist/assets/component-img-absolute.svg')))
+          .toBe(true);
         expect(host.scopedSync().exists(normalize('dist/component-img-relative.png')))
           .toBe(true);
       }),