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pnpm 9.5 Introduces Catalogs: Shareable Dependency Version Specifiers
pnpm 9.5 introduces a Catalogs feature, enabling shareable dependency version specifiers, reducing merge conflicts and improving support for monorepos.
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
26.6.2
[jest-core]
Add findRelatedTests
and nonFlagArgs
in allowed config options for updateConfigAndRun
in watch plugins (#10659)[babel-plugin-jest-hoist]
Preserve order of hoisted mock nodes within containing block (#10536)[babel-plugin-jest-hoist]
Hoist pure constants to support experimental JSX transform in hoisted mocks (#10723)[babel-preset-jest]
Update babel-preset-current-node-syntax
to support top level await (#10747)[expect]
Revert "Fix objectContaining
to work recursively into sub-objects (#10508)" (#10766)[jest-circus, jest-jasmine2]
fix: don't assume stack
is always a string (#10697)[jest-config]
Fix bug introduced in watch mode by PR #10678 (#10692)[jest-config]
Throw correct error for missing preset modules (#10737)[jest-resolve-dependencies]
Resolve mocks as dependencies (#10713)[jest-runtime]
Handle file URLs in dynamic imports (#10744)[jest-runtime, babel-jest]
Pass more ESM options to @jest/transform
(#10752)[jest-runtime]
Properly inject extraGlobals
into the runtime (#10758)[jest-transform]
Link to ESM docs on syntax errors (#10748)[docs]
Add docs for using mocks in TypeScript (#10415)[eslint-config-fb-strict]
Move package from this repo to fbjs
repo (#10739)[examples]
Update TypeScript example to show use of newer Jest types (#10399)[jest-cli]
chore: standardize files and folder names (#10698)[jest-config]
Switch ts-node Register
type to Service
due to deprecation (#11210)FAQs
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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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