jest-haste-map
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Package description
The jest-haste-map npm package is a utility for building a Haste map, which is a mapping from module names to file paths. It is used by Jest to quickly resolve module dependencies for tests by keeping an in-memory map of all available modules. It can handle duplicate module names and provides a way to query the map for a specific module.
Building a Haste Map
This code sample demonstrates how to create a new HasteMap instance with a configuration object, build the map, and then use it to get the module name for a specific file.
const HasteMap = require('jest-haste-map');
const config = {
// These options are required:
roots: ['/path/to/project'],
extensions: ['js', 'json'],
platforms: ['ios', 'android'],
// You can provide additional options:
computeSha1: true,
// other options...
};
const hasteMap = new HasteMap(config);
hasteMap.build().then(map => {
console.log(map.hasteFS.getModuleName('/path/to/project/file.js'));
});Querying the Haste Map
This code sample shows how to query the built Haste map for the path of a module given its name, platform, and whether it supports the native platform.
hasteMap.build().then(map => {
const modulePath = map.moduleMap.getModule('moduleName', 'platform', 'supportsNativePlatform');
console.log(modulePath);
});Metro is a JavaScript bundler for React Native applications. It includes a Haste map implementation similar to jest-haste-map, but it is tailored specifically for React Native and includes additional features for bundling and transforming code.
Webpack is a powerful module bundler for JavaScript applications. While it does not use a Haste map, it provides a similar functionality through its own resolution mechanism, which can handle complex dependency graphs and offers a wide range of plugins for different tasks.
Browserify is a tool for bundling JavaScript files for usage in the browser. Like webpack, it does not use a Haste map, but it allows developers to require modules in the browser by bundling up all dependencies. It's simpler than webpack and may be more suitable for smaller projects.
Changelog
29.4.0
[expect, @jest/expect-utils] Support custom equality testers (#13654)[jest-config, jest-worker] Use os.availableParallelism if available to calculate number of workers to spawn (#13738)[@jest/globals, jest-mock] Add jest.replaceProperty() that replaces property value (#13496)[jest-haste-map] ignore Sapling vcs directories (.sl/) (#13674)[jest-resolve] Support subpath imports (#13705, #13723, #13777)[jest-runtime] Add jest.isolateModulesAsync for scoped module initialization of asynchronous functions (#13680)[jest-runtime] Add jest.isEnvironmentTornDown function (#13741)[jest-test-result] Added skipped and focused status to FormattedTestResult (#13700)[jest-transform] Support for asynchronous createTransformer (#13762)[jest-environment-node] Fix non-configurable globals (#13687)[@jest/expect-utils] toMatchObject should handle Symbol properties (#13639)[jest-mock] Fix mockReset and resetAllMocks undefined return value(#13692)[jest-resolve] Add global paths to require.resolve.paths (#13633)[jest-resolve] Correct node core module detection when using node: specifiers (#13806)[jest-runtime] Support WASM files that import JS resources (#13608)[jest-runtime] Use the scriptTransformer cache in jest-runner (#13735)[jest-runtime] Enforce import assertions when importing JSON in ESM (#12755 & #13805)[jest-snapshot] Make sure to import babel outside of the sandbox (#13694)[jest-transform] Ensure the correct configuration is passed to preprocessors specified multiple times in the transform option (#13770)FAQs
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We found that jest-haste-map demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 2 open source maintainers collaborating on the project.
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