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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.
24.8.0
[jest-circus]
Bind to Circus events via an optional event handler on any custom env (#8344)[expect]
Improve report when matcher fails, part 15 (#8281)[jest-cli]
Update --forceExit
and "did not exit for one second" message colors (#8329)[expect]
Improve report when matcher fails, part 16 (#8306)[jest-runner]
Pass docblock pragmas to TestEnvironment constructor (#8320)[docs]
Add DynamoDB guide (#8319)[expect]
Improve report when matcher fails, part 17 (#8349)[expect]
Improve report when matcher fails, part 18 (#8356)[expect]
Improve report when matcher fails, part 19 (#8367)[jest-each]
Fix bug with placeholder values (#8289)[jest-snapshot]
Inline snapshots: do not indent empty lines (#8277)[@jest/runtime, @jest/transform]
Allow custom transforms for JSON dependencies (#8278)[jest-core]
Make detectOpenHandles
imply runInBand
(#8283)[jest-haste-map]
Fix the mapper
option which was incorrectly ignored (#8299)[jest-jasmine2]
Fix describe return value warning being shown if the describe function throws (#8335)[jest-environment-jsdom]
Re-declare global prototype of JSDOMEnvironment (#8352)[jest-snapshot]
Handle arrays when merging snapshots (#7089)[expect]
Extract names of async and generator functions (#8362)[jest-runtime]
Fix virtual mocks not being unmockable after previously being mocked (#8396)[jest-transform]
Replace special characters in transform cache filenames to support Windows (#8353)[jest-config]
Allow exactly one project (#7498)[expect]
Fix label and add opposite assertion for toEqual tests (#8288)[docs]
Mention Jest MongoDB Preset (#8318)[@jest/reporters]
Migrate away from istanbul-api
(#8294)[*]
Delete obsolete emails tag from header comment in test files (#8377)[expect]
optimize compare nodes (#8368)[docs]
Fix typo in MockFunctionAPI.md (#8406)[LICENSE]
Follow copyright header guidelines and delete For Jest software (#8428)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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