jest-watcher
Advanced tools
Package description
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.
Changelog
26.1.0
[jest-mock] Export Mock, MockInstance, SpyInstance types (#10138)[jest-config] Support config files exporting (async) functions (#10001)[jest-cli, jest-core] Add --selectProjects CLI argument to filter test suites by project name (#8612)[jest-cli, jest-init] Add coverageProvider to jest --init prompts (#10044)[jest-console] getConsoleOutput to receive global stack trace config and use it to format stack trace (#10081)[jest-jasmine2] Stop adding : after an error that has no message (#9990)[jest-diff] Control no diff message color with commonColor in diff options (#9997)[jest-snapshot] Fix TypeScript compilation (#10008)[docs] Correct confusing filename in enableAutomock example (#10055)[jest-core] 🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉 (#10000)[jest-core, jest-reporters, jest-test-result, jest-types] Cleanup displayName type (#10049)[jest-runtime] Jest-internal sandbox escape hatch (#9907)[jest-fake-timers] Update now param type to support Date in addition to number. (#10169)[docs] Add param to setSystemTime docs and remove preceding period from it and getRealSystemTime (#10169)[jest-snapshot, jest-util] Replace make-dir with fs.mkdir (#10136)[docs] Added parcel-bundler documentation inside readme.md file[jest-core, jest-transform, jest-haste-map] Improve Jest startup time and test runtime, particularly when running with coverage, by caching micromatch and avoiding recreating RegExp instances (#10131)FAQs
Unknown package
The npm package jest-watcher receives a total of 19,847,048 weekly downloads. As such, jest-watcher popularity was classified as popular.
We found that jest-watcher demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 5 open source maintainers collaborating on the project.
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