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chore(resolver): reuse cached lookup of package.json files (#11969)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,132 @@ | ||
| /** | ||
| * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| */ | ||
|
|
||
| import {dirname, resolve} from 'path'; | ||
| import * as fs from 'graceful-fs'; | ||
| import type {Config} from '@jest/types'; | ||
| import {tryRealpath} from 'jest-util'; | ||
|
|
||
| export function clearFsCache(): void { | ||
| checkedPaths.clear(); | ||
| checkedRealpathPaths.clear(); | ||
| packageContents.clear(); | ||
| } | ||
|
|
||
| enum IPathType { | ||
| FILE = 1, | ||
| DIRECTORY = 2, | ||
| OTHER = 3, | ||
| } | ||
| const checkedPaths = new Map<string, IPathType>(); | ||
| function statSyncCached(path: string): IPathType { | ||
| const result = checkedPaths.get(path); | ||
| if (result != null) { | ||
| return result; | ||
| } | ||
|
|
||
| let stat; | ||
| try { | ||
| stat = fs.statSync(path); | ||
| } catch (e: any) { | ||
| if (!(e && (e.code === 'ENOENT' || e.code === 'ENOTDIR'))) { | ||
| throw e; | ||
| } | ||
| } | ||
|
|
||
| if (stat) { | ||
| if (stat.isFile() || stat.isFIFO()) { | ||
| checkedPaths.set(path, IPathType.FILE); | ||
| return IPathType.FILE; | ||
| } else if (stat.isDirectory()) { | ||
| checkedPaths.set(path, IPathType.DIRECTORY); | ||
| return IPathType.DIRECTORY; | ||
| } | ||
| } | ||
|
|
||
| checkedPaths.set(path, IPathType.OTHER); | ||
| return IPathType.OTHER; | ||
| } | ||
|
|
||
| const checkedRealpathPaths = new Map<string, string>(); | ||
| function realpathCached(path: Config.Path): Config.Path { | ||
| let result = checkedRealpathPaths.get(path); | ||
|
|
||
| if (result != null) { | ||
| return result; | ||
| } | ||
|
|
||
| result = tryRealpath(path); | ||
|
|
||
| checkedRealpathPaths.set(path, result); | ||
|
|
||
| if (path !== result) { | ||
| // also cache the result in case it's ever referenced directly - no reason to `realpath` that as well | ||
| checkedRealpathPaths.set(result, result); | ||
| } | ||
|
|
||
| return result; | ||
| } | ||
|
|
||
| export type PkgJson = Record<string, unknown>; | ||
|
|
||
| const packageContents = new Map<string, PkgJson>(); | ||
| export function readPackageCached(path: Config.Path): PkgJson { | ||
| let result = packageContents.get(path); | ||
|
|
||
| if (result != null) { | ||
| return result; | ||
| } | ||
|
|
||
| result = JSON.parse(fs.readFileSync(path, 'utf8')) as PkgJson; | ||
|
|
||
| packageContents.set(path, result); | ||
|
|
||
| return result; | ||
| } | ||
|
|
||
| // adapted from | ||
| // https://github.com/lukeed/escalade/blob/2477005062cdbd8407afc90d3f48f4930354252b/src/sync.js | ||
| // to use cached `fs` calls | ||
| export function findClosestPackageJson( | ||
| start: Config.Path, | ||
| ): Config.Path | undefined { | ||
| let dir = resolve('.', start); | ||
| if (!isDirectory(dir)) { | ||
| dir = dirname(dir); | ||
| } | ||
|
|
||
| while (true) { | ||
| const pkgJsonFile = resolve(dir, './package.json'); | ||
| const hasPackageJson = isFile(pkgJsonFile); | ||
|
|
||
| if (hasPackageJson) { | ||
| return pkgJsonFile; | ||
| } | ||
|
|
||
| const prevDir = dir; | ||
| dir = dirname(dir); | ||
|
|
||
| if (prevDir === dir) { | ||
| return undefined; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /* | ||
| * helper functions | ||
| */ | ||
| export function isFile(file: Config.Path): boolean { | ||
| return statSyncCached(file) === IPathType.FILE; | ||
| } | ||
|
|
||
| export function isDirectory(dir: Config.Path): boolean { | ||
| return statSyncCached(dir) === IPathType.DIRECTORY; | ||
| } | ||
|
|
||
| export function realpathSync(file: Config.Path): Config.Path { | ||
| return realpathCached(file); | ||
| } |
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