refactor(@angular-devkit/build-angular): remove support for Stylus

The usage of Stylus in the CLI is minimal and this package never reached version 1.

BREAKING CHANGE:

Deprecated support for Stylus has been removed. The Stylus package has never reached a stable version and its usage in the Angular CLI is minimal. It's recommended to migrate to another CSS preprocessor that the Angular CLI supports.

docs/design/build-system-overview.dot

@@ -8,7 +8,6 @@ digraph G {
   "*.css" -> "postcss-loader with postcss-import, ./postcss-cli-resources.ts, autoprefixer";
   "*.scss\|sass" -> "sass-loader" -> "postcss-loader with postcss-import, ./postcss-cli-resources.ts, autoprefixer";
   "*.less" -> "less-loader" -> "postcss-loader with postcss-import, ./postcss-cli-resources.ts, autoprefixer";
-  "*.styl" -> "stylus-loader" -> "postcss-loader with postcss-import, ./postcss-cli-resources.ts, autoprefixer";
   "postcss-loader with postcss-import, ./postcss-cli-resources.ts, autoprefixer" -> "raw-loader, ./optimize-css-webpack-plugin.ts"  [label="component style?"];
   "raw-loader" -> "./optimize-css-webpack-plugin.ts"
   "postcss-loader with postcss-import, ./postcss-cli-resources.ts, autoprefixer" -> "style-loader, ./raw-css-loader.ts, and mini-css-extract-plugin" [label="global style?"];

docs/design/build-system.md

@@ -54,8 +54,8 @@ This is used for conditional loading of code at build time.
 Two types of stylesheets are used in the build system: global stylesheets and component stylesheets.
 Global stylesheets are injected into the `index.html` file, while component stylesheets are loaded directly into compiled Angular components.
 
-The build system supports plain CSS stylesheets as well as the Sass, LESS and Stylus CSS pre-processors.
+The build system supports plain CSS stylesheets as well as the Sass and LESS CSS pre-processors.
-Stylesheet processing functionality is provided by `sass-loader`, `less-loader`, `stylus-loader`, `postcss-loader`, `postcss-import`, augmented in the build system by custom webpack plugins.
+Stylesheet processing functionality is provided by `sass-loader`, `less-loader`, `postcss-loader`, `postcss-import`, augmented in the build system by custom webpack plugins.
 
 ### Assets
 

package.json

@@ -204,8 +204,6 @@
     "source-map-loader": "4.0.0",
     "source-map-support": "0.5.21",
     "spdx-satisfies": "^5.0.0",
-    "stylus": "0.59.0",
-    "stylus-loader": "7.0.0",
     "symbol-observable": "4.0.0",
     "tar": "^6.1.6",
     "terser": "5.15.0",

packages/angular_devkit/build_angular/BUILD.bazel

@@ -170,8 +170,6 @@ ts_library(
         "@npm//semver",
         "@npm//source-map-loader",
         "@npm//source-map-support",
-        "@npm//stylus",
-        "@npm//stylus-loader",
         "@npm//terser",
         "@npm//text-table",
         "@npm//tree-kill",

packages/angular_devkit/build_angular/package.json

@@ -57,8 +57,6 @@
     "semver": "7.3.7",
     "source-map-loader": "4.0.0",
     "source-map-support": "0.5.21",
-    "stylus": "0.59.0",
-    "stylus-loader": "7.0.0",
     "terser": "5.15.0",
     "text-table": "0.2.0",
     "tree-kill": "1.2.2",

packages/angular_devkit/build_angular/src/builders/browser-esbuild/schema.json

@@ -72,7 +72,7 @@
               "input": {
                 "type": "string",
                 "description": "The file to include.",
-                "pattern": "\\.(?:css|scss|sass|less|styl)$"
+                "pattern": "\\.(?:css|scss|sass|less)$"
               },
               "bundleName": {
                 "type": "string",
@@ -91,7 +91,7 @@
           {
             "type": "string",
             "description": "The file to include.",
-            "pattern": "\\.(?:css|scss|sass|less|styl)$"
+            "pattern": "\\.(?:css|scss|sass|less)$"
           }
         ]
       }

packages/angular_devkit/build_angular/src/builders/browser/schema.json

@@ -72,7 +72,7 @@
               "input": {
                 "type": "string",
                 "description": "The file to include.",
-                "pattern": "\\.(?:css|scss|sass|less|styl)$"
+                "pattern": "\\.(?:css|scss|sass|less)$"
               },
               "bundleName": {
                 "type": "string",
@@ -91,7 +91,7 @@
           {
             "type": "string",
             "description": "The file to include.",
-            "pattern": "\\.(?:css|scss|sass|less|styl)$"
+            "pattern": "\\.(?:css|scss|sass|less)$"
           }
         ]
       }

packages/angular_devkit/build_angular/src/builders/browser/specs/styles_spec.ts

@@ -13,8 +13,8 @@ import { dirname } from 'path';
 import { browserBuild, createArchitect, host } from '../../../testing/test-utils';
 
 describe('Browser Builder styles', () => {
-  const extensionsWithImportSupport = ['css', 'scss', 'less', 'styl'];
+  const extensionsWithImportSupport = ['css', 'scss', 'less'];
-  const extensionsWithVariableSupport = ['scss', 'less', 'styl'];
+  const extensionsWithVariableSupport = ['scss', 'less'];
   const imgSvg = `
     <svg width="100" height="100" xmlns="http://www.w3.org/2000/svg">
       <circle cx="50" cy="50" r="40" stroke="green" stroke-width="4" fill="yellow" />
@@ -223,9 +223,6 @@ describe('Browser Builder styles', () => {
       if (ext === 'scss') {
         variableAssignment = '$primary-color:';
         variablereference = '$primary-color';
-      } else if (ext === 'styl') {
-        variableAssignment = '$primary-color =';
-        variablereference = '$primary-color';
       } else if (ext === 'less') {
         variableAssignment = '@primary-color:';
         variablereference = '@primary-color';

packages/angular_devkit/build_angular/src/builders/browser/tests/options/bundle-budgets_spec.ts

@@ -13,7 +13,7 @@ import { Type } from '../../schema';
 import { BASE_OPTIONS, BROWSER_BUILDER_INFO, describeBuilder } from '../setup';
 
 describeBuilder(buildWebpackBrowser, BROWSER_BUILDER_INFO, (harness) => {
-  const CSS_EXTENSIONS = ['css', 'scss', 'less', 'styl'];
+  const CSS_EXTENSIONS = ['css', 'scss', 'less'];
   const BUDGET_NOT_MET_REGEXP = /Budget .+ was not met by/;
 
   describe('Option: "bundleBudgets"', () => {

packages/angular_devkit/build_angular/src/builders/browser/tests/options/inline-style-language_spec.ts

@@ -58,29 +58,6 @@ describeBuilder(buildWebpackBrowser, BROWSER_BUILDER_INFO, (harness) => {
           harness.expectFile('dist/main.js').content.toContain('color: green');
         });
 
-        // Stylus currently does not function due to the sourcemap logic within the `stylus-loader`
-        // which tries to read each stylesheet directly from disk. In this case, each stylesheet is
-        // virtual and cannot be read from disk. This issue affects data URIs in general.
-        // xit('supports Stylus inline component styles when set to "stylus"', async () => {
-        //   harness.useTarget('build', {
-        //     ...BASE_OPTIONS,
-        //     inlineStyleLanguage: InlineStyleLanguage.Stylus,
-        //     aot,
-        //   });
-
-        //   await harness.modifyFile('src/app/app.component.ts', (content) =>
-        //     content.replace(
-        //       '__STYLE_MARKER__',
-        //       '$primary = green;\\nh1 { color: $primary; }',
-        //     ),
-        //   );
-
-        //   const { result } = await harness.executeOnce();
-
-        //   expect(result?.success).toBe(true);
-        //   harness.expectFile('dist/main.js').content.toContain('color: green');
-        // });
-
         it('supports Less inline component styles when set to "less"', async () => {
           harness.useTarget('build', {
             ...BASE_OPTIONS,

packages/angular_devkit/build_angular/src/builders/extract-i18n/index.ts

@@ -224,7 +224,7 @@ export async function execute(
         module: {
           rules: [
             {
-              test: /\.(css|scss|sass|styl|less)$/,
+              test: /\.(css|scss|sass|less)$/,
               loader: require.resolve('./empty-loader'),
             },
           ],

packages/angular_devkit/build_angular/src/builders/karma/schema.json

@@ -76,7 +76,7 @@
               "input": {
                 "type": "string",
                 "description": "The file to include.",
-                "pattern": "\\.(?:css|scss|sass|less|styl)$"
+                "pattern": "\\.(?:css|scss|sass|less)$"
               },
               "bundleName": {
                 "type": "string",
@@ -95,7 +95,7 @@
           {
             "type": "string",
             "description": "The file to include.",
-            "pattern": "\\.(?:css|scss|sass|less|styl)$"
+            "pattern": "\\.(?:css|scss|sass|less)$"
           }
         ]
       }

packages/angular_devkit/build_angular/src/webpack/configs/styles.ts

@@ -101,13 +101,6 @@ export function getStylesConfig(wco: WebpackConfigOptions): Configuration {
     extraPlugins.push(new RemoveHashPlugin({ chunkNames: noInjectNames, hashFormat }));
   }
 
-  if (globalStylePaths.some((p) => p.endsWith('.styl'))) {
-    wco.logger.warn(
-      'Stylus usage is deprecated and will be removed in a future major version. ' +
-        'To opt-out of the deprecated behaviour, please migrate to another stylesheet language.',
-    );
-  }
-
   const sassImplementation = new SassWorkerImplementation();
   const sassTildeUsageMessage = new Set<string>();
 
@@ -366,22 +359,6 @@ export function getStylesConfig(wco: WebpackConfigOptions): Configuration {
         },
       ],
     },
-    {
-      extensions: ['styl'],
-      use: [
-        {
-          loader: require.resolve('stylus-loader'),
-          options: {
-            sourceMap: cssSourceMap,
-            stylusOptions: {
-              compress: false,
-              sourceMap: { comment: false },
-              paths: includePaths,
-            },
-          },
-        },
-      ],
-    },
   ];
 
   return {

packages/angular_devkit/build_angular/src/webpack/plugins/any-component-style-budget-checker.ts

@@ -47,7 +47,7 @@ export class AnyComponentStyleBudgetChecker {
             return;
           }
 
-          const cssExtensions = ['.css', '.scss', '.less', '.styl', '.sass'];
+          const cssExtensions = ['.css', '.scss', '.less', '.sass'];
 
           const componentStyles = Object.keys(compilation.assets)
             .filter((name) => cssExtensions.includes(path.extname(name)))

packages/angular_devkit/build_angular/src/webpack/plugins/css-optimizer-plugin.ts

@@ -52,7 +52,7 @@ export class CssOptimizerPlugin {
 
           logger.time('optimize css assets');
           for (const assetName of Object.keys(compilationAssets)) {
-            if (!/\.(?:css|scss|sass|less|styl)$/.test(assetName)) {
+            if (!/\.(?:css|scss|sass|less)$/.test(assetName)) {
               continue;
             }
 

tests/legacy-cli/e2e/tests/build/styles/include-paths.ts

@@ -18,17 +18,6 @@ export default async function () {
       @import 'variables';
       h2 { background-color: $primary-color; }
       `,
-    'src/style-paths/variables.styl': '$primary-color = green',
-    'src/styles.styl': `
-      @import 'variables'
-      h3
-        color: $primary-color
-      `,
-    'src/app/app.component.styl': `
-      @import 'variables'
-      h4
-        background-color: $primary-color
-      `,
     'src/style-paths/variables.less': '@primary-color: #ADDADD;',
     'src/styles.less': `
       @import 'variables';
@@ -43,17 +32,14 @@ export default async function () {
   await replaceInFile(
     'src/app/app.component.ts',
     `'./app.component.css\'`,
-    `'./app.component.scss'` + (esbuild ? '' : `, './app.component.styl', './app.component.less'`),
+    `'./app.component.scss'` + (esbuild ? '' : `, './app.component.less'`),
   );
 
   await updateJsonFile('angular.json', (workspaceJson) => {
     const appArchitect = workspaceJson.projects['test-project'].architect;
     appArchitect.build.options.styles = [{ input: 'src/styles.scss' }];
     if (!esbuild) {
-      appArchitect.build.options.styles.push(
+      appArchitect.build.options.styles.push({ input: 'src/styles.less' });
-        { input: 'src/styles.styl' },
-        { input: 'src/styles.less' },
-      );
     }
     appArchitect.build.options.stylePreprocessorOptions = {
       includePaths: ['src/style-paths'],
@@ -64,9 +50,7 @@ export default async function () {
   await expectFileToMatch('dist/test-project/styles.css', /h1\s*{\s*color: red;\s*}/);
   await expectFileToMatch('dist/test-project/main.js', /h2.*{.*color: red;.*}/);
   if (!esbuild) {
-    // These checks are for the less and stylus files
+    // These checks are for the less files
-    await expectFileToMatch('dist/test-project/styles.css', /h3\s*{\s*color: #008000;\s*}/);
-    await expectFileToMatch('dist/test-project/main.js', /h4.*{.*color: #008000;.*}/);
     await expectFileToMatch('dist/test-project/styles.css', /h5\s*{\s*color: #ADDADD;\s*}/);
     await expectFileToMatch('dist/test-project/main.js', /h6.*{.*color: #ADDADD;.*}/);
   }
@@ -77,8 +61,6 @@ export default async function () {
 
     await expectFileToMatch('dist/test-project/styles.css', /h1\s*{\s*color: red;\s*}/);
     await expectFileToMatch('dist/test-project/main.js', /h2.*{.*color: red;.*}/);
-    await expectFileToMatch('dist/test-project/styles.css', /h3\s*{\s*color: #008000;\s*}/);
-    await expectFileToMatch('dist/test-project/main.js', /h4.*{.*color: #008000;.*}/);
     await expectFileToMatch('dist/test-project/styles.css', /h5\s*{\s*color: #ADDADD;\s*}/);
     await expectFileToMatch('dist/test-project/main.js', /h6.*{.*color: #ADDADD;.*}/);
   }

tests/legacy-cli/e2e/tests/build/styles/stylus.ts

@@ -1,51 +0,0 @@
-import {
-  writeMultipleFiles,
-  deleteFile,
-  expectFileToMatch,
-  replaceInFile,
-} from '../../../utils/fs';
-import { expectToFail } from '../../../utils/utils';
-import { ng } from '../../../utils/process';
-import { updateJsonFile } from '../../../utils/project';
-
-export default function () {
-  // TODO(architect): Delete this test. It is now in devkit/build-angular.
-
-  return writeMultipleFiles({
-    'src/styles.styl': `
-      @import './imported-styles.styl';
-      body { background-color: blue; }
-    `,
-    'src/imported-styles.styl': 'p { background-color: red; }',
-    'src/app/app.component.styl': `
-        .outer {
-          .inner {
-            background: #fff;
-          }
-        }
-      `,
-  })
-    .then(() => deleteFile('src/app/app.component.css'))
-    .then(() =>
-      updateJsonFile('angular.json', (workspaceJson) => {
-        const appArchitect = workspaceJson.projects['test-project'].architect;
-        appArchitect.build.options.styles = [{ input: 'src/styles.styl' }];
-      }),
-    )
-    .then(() =>
-      replaceInFile('src/app/app.component.ts', './app.component.css', './app.component.styl'),
-    )
-    .then(() => ng('build', '--source-map', '--configuration=development'))
-    .then(() =>
-      expectFileToMatch('dist/test-project/styles.css', /body\s*{\s*background-color: #00f;\s*}/),
-    )
-    .then(() =>
-      expectFileToMatch('dist/test-project/styles.css', /p\s*{\s*background-color: #f00;\s*}/),
-    )
-    .then(() =>
-      expectToFail(() => expectFileToMatch('dist/test-project/styles.css', '"mappings":""')),
-    )
-    .then(() =>
-      expectFileToMatch('dist/test-project/main.js', /.outer.*.inner.*background:\s*#[fF]+/),
-    );
-}