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jest-watcher
Advanced tools
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.
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;
Mocha-watch is a watch mode for Mocha testing framework. It provides similar functionality to jest-watcher by re-running tests when file changes are detected. However, it is tailored for Mocha and does not offer the same plugin API for extending watch behavior.
Karma is a test runner that works with multiple testing frameworks like Jasmine, Mocha, and QUnit. It can watch files and re-run tests on changes, similar to jest-watcher. Karma is more of a full-fledged test runner with a focus on running tests in different browsers, whereas jest-watcher is specifically for creating watch plugins in Jest.
AVA is a test runner with built-in watch mode functionality. It automatically re-runs tests when it detects changes. AVA's watch mode is not plugin-based like jest-watcher, but it offers a simple and fast out-of-the-box solution for watching tests without the need for additional configuration.
29.4.0
[expect, @jest/expect-utils]
Support custom equality testers (#13654)[jest-config, jest-worker]
Use os.availableParallelism
if available to calculate number of workers to spawn (#13738)[@jest/globals, jest-mock]
Add jest.replaceProperty()
that replaces property value (#13496)[jest-haste-map]
ignore Sapling vcs directories (.sl/
) (#13674)[jest-resolve]
Support subpath imports (#13705, #13723, #13777)[jest-runtime]
Add jest.isolateModulesAsync
for scoped module initialization of asynchronous functions (#13680)[jest-runtime]
Add jest.isEnvironmentTornDown
function (#13741)[jest-test-result]
Added skipped
and focused
status to FormattedTestResult
(#13700)[jest-transform]
Support for asynchronous createTransformer
(#13762)[jest-environment-node]
Fix non-configurable globals (#13687)[@jest/expect-utils]
toMatchObject
should handle Symbol
properties (#13639)[jest-mock]
Fix mockReset
and resetAllMocks
undefined
return value(#13692)[jest-resolve]
Add global paths to require.resolve.paths
(#13633)[jest-resolve]
Correct node core module detection when using node:
specifiers (#13806)[jest-runtime]
Support WASM files that import JS resources (#13608)[jest-runtime]
Use the scriptTransformer
cache in jest-runner
(#13735)[jest-runtime]
Enforce import assertions when importing JSON in ESM (#12755 & #13805)[jest-snapshot]
Make sure to import babel
outside of the sandbox (#13694)[jest-transform]
Ensure the correct configuration is passed to preprocessors specified multiple times in the transform
option (#13770)FAQs
Delightful JavaScript Testing.
The npm package jest-watcher receives a total of 25,366,237 weekly downloads. As such, jest-watcher popularity was classified as popular.
We found that jest-watcher demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 5 open source maintainers collaborating on the project.
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