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perf(@angular/build): add persistent caching of JavaScript transforma…
…tions When caching is enabled for the Angular CLI, the JavaScript transformer within the application build system will now perform persistent caching of its output. This allows for improved warm build times by removing the need to run the Angular linker and build optimizer steps against unchanged third-party code within each build. This does not affect hot rebuilds that would take place during watch mode since the outputs are already cached within memory. The on-disk storage of the cached data is handled by the `lmdb` package which provides fast key/value storage and built-in off-thread compression. This package is currently used by such projects as Gatsby and parcel for their respective caching subsystems. Warm production build of a new 18.0.0-rc.2 project with disabled caching: ``` Application bundle generation complete. [3.698 seconds] ``` With enabled caching: ``` Application bundle generation complete. [2.277 seconds] ```
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packages/angular/build/src/tools/esbuild/lmdb-cache-store.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| /** | ||
| * @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 { RootDatabase, open } from 'lmdb'; | ||
| import { Cache, CacheStore } from './cache'; | ||
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| export class LmbdCacheStore implements CacheStore<unknown> { | ||
| readonly #cacheFileUrl; | ||
| #db: RootDatabase | undefined; | ||
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| constructor(readonly cachePath: string) { | ||
| this.#cacheFileUrl = cachePath; | ||
| } | ||
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| #ensureCacheFile(): RootDatabase { | ||
| this.#db ??= open({ | ||
| path: this.#cacheFileUrl, | ||
| compression: true, | ||
| }); | ||
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| return this.#db; | ||
| } | ||
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| // eslint-disable-next-line @typescript-eslint/no-explicit-any | ||
| async get(key: string): Promise<any> { | ||
| const db = this.#ensureCacheFile(); | ||
| const value = db.get(key); | ||
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| return value; | ||
| } | ||
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| has(key: string): boolean { | ||
| return this.#ensureCacheFile().doesExist(key); | ||
| } | ||
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| async set(key: string, value: unknown): Promise<this> { | ||
| const db = this.#ensureCacheFile(); | ||
| await db.put(key, value); | ||
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| return this; | ||
| } | ||
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| createCache<V = unknown>(namespace: string): Cache<V> { | ||
| return new Cache(this, namespace); | ||
| } | ||
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| async close() { | ||
| try { | ||
| await this.#db?.close(); | ||
| } catch { | ||
| // Failure to close should not be fatal | ||
| } | ||
| } | ||
| } |
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