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+# 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](https://facebook.github.io/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 :
+
+```bash
+npm install jest-haste-map --save-dev
+```
+
+with yarn :
+
+```bash
+yarn add jest-haste-map --dev
+```
+
+## usage
+
+`jest-haste-map` is compatible with both `ES modules` and `CommonJS`
+
+### simple usage
+
+```javascript
+const map = new HasteMap.default({
+  // options
+});
+```
+
+### Example usage (get all files with .js extension in the project)
+
+```javascript
+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](https://github.com/jestjs/jest/tree/main/packages/jest-haste-map)