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jest-watcher

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jest-watcher

Delightful JavaScript Testing.


Version published
Weekly downloads
21M
decreased by-19.25%
Maintainers
5
Install size
4.60 MB
Created
Weekly downloads
 

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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Package last updated on 20 Feb 2024

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