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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.
25.2.0
[jest-config]
Support ESM config files with .js
extension (#9573).[jest-runtime]
Override module.createRequire
to return a Jest-compatible require
function (#9469)[jest-haste-map]
[BREAKING] Remove mapper
option (#9581)[*]
Support array of paths for moduleNameMapper
aliases (#9465)[jest-reporters]
Adds ability to pass options to the istanbul-reporter through coverageReporters
(#9572)[jest-runtime]
Require stack when a module cannot be resolved (#9681)[jest-transform]
writeCacheFile
no longer calls fsync
(#9695)[expect]
Handle readonly properties correctly (#9575)[jest-cli]
Set coverageProvider
correctly when provided in config (#9562)[jest-cli]
Allow specifying .cjs
and .mjs
config files by --config
CLI option (#9578)[jest-cli]
Update yargs to fix CLI flag overriding (#9519)[jest-config]
Treat setupFilesAfterEnv
like setupFiles
when normalizing configs against presets (#9495)[jest-config]
Support .mjs
config files on Windows as well (#9558)[jest-config]
Verify rootDir
and all roots
are directories (#9569)[jest-config]
Ensure pattern of replacePosixSep
is a string (#9546)[jest-haste-map]
Fix crash on unix based systems without find (#9579)[jest-jasmine2]
Fix --testNamePattern
matching with concurrent
tests (#9090)[jest-matcher-utils]
Fix diff highlight of symbol-keyed object. (#9499)[@jest/reporters]
Notifications should be fire&forget rather than having a timeout (#9567)[jest-resolve]
Fix module identity preservation with symlinks and browser field resolution (#9511)[jest-resolve]
Do not confuse directories with files (#8912)[jest-resolve]
moduleNameMapper
should take precedence over Node core modules (#9563)[jest-runtime]
Reset isolateModules
if it fails (#9541)[jest-runtime]
Yarn PnP errors displayed to the user (#9681)[jest-snapshot]
Downgrade semver to v6 to support node 8 (#9451)[jest-snapshot]
Properly indent new snapshots in the presences of existing ones (#9523)[jest-transform]
Correct sourcemap behavior for transformed and instrumented code (#9460)[jest-transform]
Allow instrumentation of transformed files with weird file extensions (#9589)[@jest/types]
Make ConfigGlobals
an interface to allow for declaration merging. (#9570)[pretty-format]
Export OldPlugin
type (#9491)[docs]
Warn about unexpected behavior / bug of node-notifier when using the notify
options.[docs]
Grammatical corrections to Async docs page. (#9679)[jest-resolver]
Use resolve
package to implement custom module resolution (#9520)[jest-runtime]
Move execution of setupFiles
to jest-runner
(#9596)[jest-runtime]
Update anchor link in helpers
(#9616)[@jest/reporters]
Remove unused dependencies and type exports (#9462)[website]
Update pictures of reports when matchers fail (#9214)[jest-haste-map]
Reduce number of lstat
calls in node crawler (#9514)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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