jest-haste-map
Advanced tools
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
jest 18.0.0
See https://jestjs.io/blog/2016/12/15/2016-in-jest
pit and mockImpl. Use it or mockImplementation instead.--bail is used together with --watch.pretty-format is now merged into Jest.require('v8') now works properly in a test context.expect.any, expect.anything, expect.objectContaining, expect.arrayContaining, expect.stringMatching.snapshotSerializers, setupFiles, transform, testRunner and testResultsProcessor instead of using path.resolve.--testResultsProcessor is now exposed through the cli.--jsonOutputFile to --outputFile.jest-editor-support for vscode and Nuclide integration.test.concurrent unhandled promise rejections.testRegex to include test.js and spec.js files.babel-plugin-jest-hoist when using jest.mock with three arguments.JSON global in jest-environment-node now comes from the vm context instead of the parent context.FakeTimers.useTimers() is called.JEST_HIDE_USAGE.expect.assertions(number) which will ensure that a specified amount of assertions is made in one test..toMatchSnapshot(?string) feature to give snapshots a name.jest-react-native was deprecated and now forwards react-native..toMatchObject matcher.NaN% Failed in the OS notification when using --notify..toHaveProperty matcher.Map/Set comparisons.test.concurrent now works with --testNamePattern.FAQs
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The npm package jest-haste-map receives a total of 19,800,374 weekly downloads. As such, jest-haste-map popularity was classified as popular.
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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