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jest-watcher

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jest-watcher

Delightful JavaScript Testing.


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5
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Package description

What is jest-watcher?

The jest-watcher package is a part of the Jest ecosystem and is used to implement custom watch plugins for Jest. It provides an API to create plugins that can hook into Jest's watch mode, allowing developers to add custom watch behaviors to their test suites.

What are jest-watcher's main functionalities?

Custom Watch Plugins

This feature allows developers to create custom watch plugins that can react to file changes, determine if a test suite should run, and more. The code sample shows a basic structure of a custom watch plugin.

class MyCustomPlugin {
  apply(jestHooks) {
    jestHooks.onFileChange(({ projects }) => {
      console.log('Files changed:', projects[0].changedFiles);
    });
    jestHooks.shouldRunTestSuite(() => true);
  }
}

module.exports = MyCustomPlugin;

Interactive Watch Plugins

This feature allows the creation of interactive watch plugins that can provide custom interactive CLI interfaces during Jest's watch mode. The code sample demonstrates how to implement an interactive behavior that filters tests based on a pattern.

class MyInteractivePlugin {
  run(globalConfig, updateConfigAndRun) {
    // Implement interactive behavior here
    updateConfigAndRun({
      testNamePattern: 'pattern to filter tests'
    });
    return Promise.resolve();
  }
}

module.exports = MyInteractivePlugin;

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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

Package last updated on 12 Sep 2023

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