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feat(@angular-devkit/build-angular): add initial watch support to esb…
…uild-based builder The experimental esbuild-based browser application builder now contains initial support for watching input files and rebuilding the application via the `--watch` option. This initial implemention is not yet optimized for incremental rebuilds and will perform a full rebuild upon detection of a change. Incremental rebuild support will be added in followup changes and will significantly improve the rebuild speed. The `chokidar` npm package is used to perform the file watching which allows for native file- system event based watching. Polling is also support via the `--poll` option for environments that require it.
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110 changes: 110 additions & 0 deletions
110
packages/angular_devkit/build_angular/src/builders/browser-esbuild/watcher.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| /** | ||
| * @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 | ||
| */ | ||
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| import { FSWatcher } from 'chokidar'; | ||
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| export class ChangedFiles { | ||
| readonly added = new Set<string>(); | ||
| readonly modified = new Set<string>(); | ||
| readonly removed = new Set<string>(); | ||
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| toDebugString(): string { | ||
| const content = { | ||
| added: Array.from(this.added), | ||
| modified: Array.from(this.modified), | ||
| removed: Array.from(this.removed), | ||
| }; | ||
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| return JSON.stringify(content, null, 2); | ||
| } | ||
| } | ||
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| export interface BuildWatcher extends AsyncIterableIterator<ChangedFiles> { | ||
| add(paths: string | string[]): void; | ||
| remove(paths: string | string[]): void; | ||
| close(): Promise<void>; | ||
| } | ||
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| export function createWatcher(options?: { | ||
| polling?: boolean; | ||
| interval?: number; | ||
| ignored?: string[]; | ||
| }): BuildWatcher { | ||
| const watcher = new FSWatcher({ | ||
| ...options, | ||
| disableGlobbing: true, | ||
| ignoreInitial: true, | ||
| }); | ||
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| const nextQueue: ((value?: ChangedFiles) => void)[] = []; | ||
| let currentChanges: ChangedFiles | undefined; | ||
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| watcher.on('all', (event, path) => { | ||
| switch (event) { | ||
| case 'add': | ||
| currentChanges ??= new ChangedFiles(); | ||
| currentChanges.added.add(path); | ||
| break; | ||
| case 'change': | ||
| currentChanges ??= new ChangedFiles(); | ||
| currentChanges.modified.add(path); | ||
| break; | ||
| case 'unlink': | ||
| currentChanges ??= new ChangedFiles(); | ||
| currentChanges.removed.add(path); | ||
| break; | ||
| default: | ||
| return; | ||
| } | ||
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| const next = nextQueue.shift(); | ||
| if (next) { | ||
| const value = currentChanges; | ||
| currentChanges = undefined; | ||
| next(value); | ||
| } | ||
| }); | ||
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| return { | ||
| [Symbol.asyncIterator]() { | ||
| return this; | ||
| }, | ||
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| async next() { | ||
| if (currentChanges && nextQueue.length === 0) { | ||
| const result = { value: currentChanges }; | ||
| currentChanges = undefined; | ||
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| return result; | ||
| } | ||
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| return new Promise((resolve) => { | ||
| nextQueue.push((value) => resolve(value ? { value } : { done: true, value })); | ||
| }); | ||
| }, | ||
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| add(paths) { | ||
| watcher.add(paths); | ||
| }, | ||
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| remove(paths) { | ||
| watcher.unwatch(paths); | ||
| }, | ||
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| async close() { | ||
| try { | ||
| await watcher.close(); | ||
| } finally { | ||
| let next; | ||
| while ((next = nextQueue.shift()) !== undefined) { | ||
| next(); | ||
| } | ||
| } | ||
| }, | ||
| }; | ||
| } |
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