jest-haste-map

jest-haste-map is a module used by Jest, a popular JavaScript testing framework, to create a fast lookup of files in a project. It helps Jest efficiently locate and track changes in files during testing, making it particularly useful for large projects with many files.

why jest-haste-map ?

Parallel crawling and analysis: jest-haste-map crawls the entire project, extracts dependencies, and analyzes files in parallel across worker processes.This can significantly improve the performance of the map building process.
Cached file system: jest-haste-map keeps a cache of the file system in memory and on disk. This allows for fast file related operations, such as resolving module imports and checking for changes.
Minimal work: jest-haste-map only does the minimal amount of work necessary when files change. (If you are using watchman (recommended for large projects), Jest will ask watchman for changed files instead of crawling the file system. This is very fast even if you have tens of thousands of files.)
File system watching: jest-haste-map can watch the file system for changes. This is useful for building interactive tools, such as watch mode.

Installation

with npm :

npm install jest-haste-map --save-dev

with yarn :

yarn add jest-haste-map --dev

usage

jest-haste-map is compatible with both ES modules and CommonJS

simple usage

const map = new HasteMap.default({
  // options
});

Example usage (get all files with .js extension in the project)

import HasteMap from 'jest-haste-map';
import os from 'os';
import {dirname} from 'path';
import {fileURLToPath} from 'url';

const root = dirname(fileURLToPath(import.meta.url));

const map = new HasteMap.default({
  id: 'myproject', //Used for caching.
  extensions: ['js'], // Tells jest-haste-map to only crawl .js files.
  maxWorkers: os.availableParallelism(), //Parallelizes across all available CPUs.
  platforms: [], // This is only used for React Native, you can leave it empty.
  roots: [root], // Can be used to only search a subset of files within `rootDir`
  retainAllFiles: true,
  rootDir: root, //The project root.
});

const {hasteFS} = await map.build();

const files = hasteFS.getAllFiles();

console.log(files);

options

Option	Type	Required	Default Value
cacheDirectory	string	No	`os.tmpdir()`
computeDependencies	boolean	No	`true`
computeSha1	boolean	No	`false`
console	Console	No	-
dependencyExtractor	string \| null	No	`null`
enableSymlinks	boolean	No	`false`
extensions	Array<string>	Yes	-
forceNodeFilesystemAPI	boolean	Yes	-
hasteImplModulePath	string	Yes	-
hasteMapModulePath	string	Yes	-
id	string	Yes	-
ignorePattern	HasteRegExp	No	-
maxWorkers	number	Yes	-
mocksPattern	string	No	-
platforms	Array<string>	Yes	-
resetCache	boolean	No	-
retainAllFiles	boolean	Yes	-
rootDir	string	Yes	-
roots	Array<string>	Yes	-
skipPackageJson	boolean	Yes	-
throwOnModuleCollision	boolean	Yes	-
useWatchman	boolean	No	`true`

For more, you can check github

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