angular/tools/postinstall-patches.js

/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

try {
  require.resolve('shelljs');
} catch (e) {
  // We are in an bazel managed external node_modules repository
  // and the resolve has failed because node did not preserve the symlink
  // when loading the script.
  // This can be fixed using the --preserve-symlinks-main flag which
  // is introduced in node 10.2.0
  console.warn(
      `Running postinstall-patches.js script in an external repository requires --preserve-symlinks-main node flag introduced in node 10.2.0. ` +
      `Current node version is ${process.version}. Node called with '${process.argv.join(' ')}'.`);
  process.exit(0);
}

const {set, cd, sed, echo, ls, rm} = require('shelljs');
const {readFileSync, writeFileSync} = require('fs');
const path = require('path');
const log = console.info;

// COMMENTED OUT BECAUSE WE CURRENTLY REQUIRE NO PATCHES
// UNCOMMENT TO REENABLE PATCHING AND LOG OUTPUT
//
log('===== about to run the postinstall-patches.js script     =====');
// fail on first error
set('-e');
// print commands as being executed
set('-v');
// jump to project root
cd(path.join(__dirname, '../'));

/* EXAMPLE PATCH:
// https://github.com/ReactiveX/rxjs/pull/3302
// make node_modules/rxjs compilable with Typescript 2.7
// remove when we update to rxjs v6
log('\n# patch: reactivex/rxjs#3302 make node_modules/rxjs compilable with Typescript 2.7');
sed('-i', '(\'response\' in xhr)', '(\'response\' in (xhr as any))',
    'node_modules/rxjs/src/observable/dom/AjaxObservable.ts');
*/

// Workaround https://github.com/bazelbuild/rules_nodejs/issues/1033
// TypeScript doesn't understand typings without "declare module" unless
// they are actually resolved by the @types default mechanism
log('\n# patch: @types/babel__* adding declare module wrappers');
ls('node_modules/@types').filter(f => f.startsWith('babel__')).forEach(pkg => {
  const modName = '@' + pkg.replace('__', '/');
  const typingsFile = `node_modules/@types/${pkg}/index.d.ts`;
  // Only add the patch if it is not already there.
  if (readFileSync(typingsFile, 'utf8').indexOf('/*added by tools/postinstall_patches.js*/') ===
      -1) {
    const insertPrefix = `/*added by tools/postinstall_patches.js*/ declare module "${modName}" { `;
    sed('-i', `(// Type definitions for ${modName})`, insertPrefix + '$1', typingsFile);
    echo('}').toEnd(typingsFile);
  }
});

log('\n# patch: use local version of @angular/* and zone.js in Starlark files from dev-infra');

const ngDevPatches = new Map();
const captureNgDevPatches = (files, patches) =>
    patches.forEach(p => _captureNgDevPatch(p[0], p[1], files));
const _captureNgDevPatch = (search, replace, files) => {
  for (const fileName of files) {
    const patches = ngDevPatches.get(fileName);
    const currentPatches = (patches !== null && patches !== undefined) ? patches : [];
    ngDevPatches.set(fileName, [...currentPatches, [search, replace]]);
  }
};

// Patches for the component benchmark rule.
captureNgDevPatches(
    [
      'node_modules/@angular/build-tooling/bazel/benchmark/component_benchmark/component_benchmark.bzl',
    ],
    [
      ['@npm//@angular/platform-browser', '@angular//packages/platform-browser'],
      ['@npm//@angular/core', '@angular//packages/core'],
      ['@npm//zone.js', '//packages/zone.js/dist:zone'],
      [
        'load\\("@npm//@angular/bazel:index.bzl", "ng_module"\\)',
        'load\("@angular//tools:defaults.bzl", "ng_module"\)'
      ],
    ]);

// Patches for the app bundling
captureNgDevPatches(
    [
      'node_modules/@angular/build-tooling/bazel/app-bundling/index.bzl',
      'node_modules/@angular/build-tooling/bazel/app-bundling/esbuild.config-tmpl.mjs',
    ],
    [
      // The app bundle config accesses the linker entry-point as well, so we need
      // to request it as well.
      [
        '"@npm//@angular/compiler-cli"',
        '"@angular//packages/compiler-cli", "@angular//packages/compiler-cli/linker/babel"'
      ],
      // When these entry-points are consumed from sources within Bazel, the package exports
      // are not available and explicit imports (as per ECMAScript module) are needed.
      // This can be removed when devmode&prodmode is combined/ESM is used everywhere.
      [
        `from '@angular/compiler-cli/linker/babel'`,
        `from '@angular/compiler-cli/linker/babel/index.js'`
      ],
      [
        `from '@angular/compiler-cli/private/tooling'`,
        `from '@angular/compiler-cli/private/tooling.js'`
      ],
    ]);

// Patches for angular linker
captureNgDevPatches(
    [
      'node_modules/@angular/build-tooling/shared-scripts/angular-linker/BUILD.bazel',
      'node_modules/@angular/build-tooling/shared-scripts/angular-linker/esbuild-plugin.mjs',
    ],
    [
      [
        '"@npm//@angular/compiler-cli"',
        '"@angular//packages/compiler-cli", "@angular//packages/compiler-cli/linker/babel"'
      ],
      [
        `from '@angular/compiler-cli/linker/babel'`,
        `from '@angular/compiler-cli/linker/babel/index.js'`
      ],
    ]);

// Apply the captured patches for the `@angular/build-tooling` package.
for (const [fileName, patches] of ngDevPatches.entries()) {
  for (const patch of patches) {
    sed('-i', patch[0], patch[1], fileName);
  }
}

// TODO: Remove when https://github.com/bazelbuild/rules_nodejs/pull/3517 is available.
sed('-i', 'private rootDirsRelative;', 'rootDirsRelative(fileName: string): string;',
    'node_modules/@bazel/concatjs/internal/tsc_wrapped/compiler_host.d.ts');

log('\n# patch: delete d.ts files referring to rxjs-compat');
// more info in https://github.com/angular/angular/pull/33786
rm('-rf', [
  'node_modules/rxjs/add/',
  'node_modules/rxjs/observable/',
  'node_modules/rxjs/operator/',
  // rxjs/operators is a public entry point that also contains files to support legacy deep import
  // paths, so we need to preserve index.* and package.json files that are required for module
  // resolution.
  'node_modules/rxjs/operators/!(index.*|package.json)',
  'node_modules/rxjs/scheduler/',
  'node_modules/rxjs/symbol/',
  'node_modules/rxjs/util/',
  'node_modules/rxjs/internal/Rx.d.ts',
  'node_modules/rxjs/AsyncSubject.*',
  'node_modules/rxjs/BehaviorSubject.*',
  'node_modules/rxjs/InnerSubscriber.*',
  'node_modules/rxjs/interfaces.*',
  'node_modules/rxjs/Notification.*',
  'node_modules/rxjs/Observable.*',
  'node_modules/rxjs/Observer.*',
  'node_modules/rxjs/Operator.*',
  'node_modules/rxjs/OuterSubscriber.*',
  'node_modules/rxjs/ReplaySubject.*',
  'node_modules/rxjs/Rx.*',
  'node_modules/rxjs/Scheduler.*',
  'node_modules/rxjs/Subject.*',
  'node_modules/rxjs/SubjectSubscription.*',
  'node_modules/rxjs/Subscriber.*',
  'node_modules/rxjs/Subscription.*',
]);

log('===== finished running the postinstall-patches.js script =====');