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.

What are jest-haste-map's main functionalities?

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);
});

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Changelog

Source

24.9.0

Features

[expect] Highlight substring differences when matcher fails, part 1 (#8448)
[expect] Highlight substring differences when matcher fails, part 2 (#8528)
[expect] Improve report when mock-spy matcher fails, part 1 (#8640)
[expect] Improve report when mock-spy matcher fails, part 2 (#8649)
[expect] Improve report when mock-spy matcher fails, part 3 (#8697)
[expect] Improve report when mock-spy matcher fails, part 4 (#8710)
[expect] Throw matcher error when received cannot be jasmine spy (#8747)
[expect] Improve report when negative CalledWith assertion fails (#8755)
[expect] Improve report when positive CalledWith assertion fails (#8771)
[expect] Display equal values for ReturnedWith similar to CalledWith (#8791)
[expect, jest-snapshot] Change color from green for some args in matcher hints (#8812)
[jest-snapshot] Highlight substring differences when matcher fails, part 3 (#8569)
[jest-core] Improve report when snapshots are obsolete (#8665)
[jest-cli] Improve chai support (with detailed output, to match jest exceptions) (#8454)
[*] Manage the global timeout with --testTimeout command line argument. (#8456)
[pretty-format] Render custom displayName of memoized components (#8546)
[jest-validate] Allow maxWorkers as part of the jest.config.js (#8565)
[jest-runtime] Allow passing configuration objects to transformers (#7288)
[@jest/core, @jest/test-sequencer] Support async sort in custom testSequencer (#8642)
[jest-runtime, @jest/fake-timers] Add jest.advanceTimersToNextTimer (#8713)
[@jest-transform] Extract transforming require logic within jest-core into @jest-transform (#8756)
[jest-matcher-utils] Add color options to matcherHint (#8795)
[jest-circus/jest-jasmine2] Give clearer output for Node assert errors (#8792)
[jest-runner] Export all types in the type signature of jest-runner (#8825)

Fixes

[jest-cli] Detect side-effect only imports when running --onlyChanged or --changedSince (#8670)
[jest-cli] Allow --maxWorkers to work with % input again (#8565)
[babel-plugin-jest-hoist] Expand list of whitelisted globals in global mocks (#8429)
[jest-core] Make watch plugin initialization errors look nice (#8422)
[jest-snapshot] Prevent inline snapshots from drifting when inline snapshots are updated (#8492)
[jest-haste-map] Don't throw on missing mapper in Node crawler (#8558)
[jest-core] Fix incorrect passWithNoTests warning (#8595)
[jest-snapshots] Fix test retries that contain snapshots (#8629)
[jest-mock] Fix incorrect assignments when restoring mocks in instances where they originally didn't exist (#8631)
[expect] Fix stack overflow when matching objects with circular references (#8687)
[jest-haste-map] Workaround a node >=12.5.0 bug that causes the process not to exit after tests have completed and cancerous memory growth (#8787)

Chore & Maintenance

[docs] Replace FlowType with TypeScript in CONTRIBUTING.MD code conventions
[jest-leak-detector] remove code repeat (#8438)
[docs] Add example to jest.requireActual (#8482)
[docs] Add example to jest.mock for mocking ES6 modules with the factory parameter (#8550)
[docs] Add information about using jest.doMock with ES6 imports (#8573)
[docs] Fix variable name in custom-matcher-api code example (#8582)
[docs] Fix example used in custom environment docs (#8617)
[docs] Updated react tutorial to refer to new package of react-testing-library (@testing-library/react) (#8753)
[docs] Updated imports of react-testing-library to @testing-library/react in website (#8757)
[jest-core] Add getVersion (moved from jest-cli) (#8706)
[docs] Fix MockFunctions example that was using toContain instead of toContainEqual (#8765)
[*] Make sure copyright header comment includes license (#8783)
[*] Check copyright and license as one joined substring (#8815)
[docs] Fix WatchPlugins jestHooks.shouldRunTestSuite example that receives an object (#8784)
[*] Enforce LF line endings (#8809)
[pretty-format] Delete obsolete link and simplify structure in README (#8824)
[docs] Fix broken transform link on webpack page (#9155)

Performance

[jest-watcher] Minor optimization for JestHook (#8746)
[@jest/reporters] Prevent runaway CPU usage with --notify on macOS (#8831)

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Last updated on 16 Aug 2019

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