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jest-haste-map

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    jest-haste-map


Version published
Weekly downloads
32M
decreased by-1.67%
Maintainers
2
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4.94 MB
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Package description

What is jest-haste-map?

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

29.7.0

Features

  • [create-jest] Add npm init / yarn create initialiser for Jest projects (#14465)
  • [jest-validate] Allow deprecation warnings for unknown options (#14499)

Fixes

  • [jest-resolver] Replace unmatched capture groups in moduleNameMapper with empty string instead of undefined (#14507)
  • [jest-snapshot] Allow for strings as well as template literals in inline snapshots (#14465)
  • [@jest/test-sequencer] Calculate test runtime if perStats.duration is missing (#14473)

Performance

  • [@jest/create-cache-key-function] Cache access of NODE_ENV and BABEL_ENV (#14455)

Chore & Maintenance

  • [jest-cli] Move internal config initialisation logic to the create-jest package (#14465)

FAQs

Last updated on 12 Sep 2023

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