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babel-jest
Advanced tools
[Babel](https://github.com/babel/babel) [jest](https://github.com/facebook/jest) plugin
The babel-jest package is a Jest plugin that makes it easy to use Babel to transform your JavaScript tests. It automatically hooks Babel into Jest and compiles files before running them, allowing you to use the latest JavaScript features and syntax in your test files.
Transforming test files with Babel
This configuration in Jest's setup file tells Jest to use babel-jest for transforming any files that match the regex pattern (in this case, any JavaScript files) before running the tests.
module.exports = {
transform: {
'^.+\\.js$': 'babel-jest'
}
};
Using modern JavaScript syntax in tests
With babel-jest, you can write tests using modern JavaScript features like async/await without worrying about compatibility issues.
test('async/await works', async () => {
const data = await fetchData();
expect(data).toBe('expected data');
});
Custom Babel configuration
babel-jest allows you to specify a custom Babel configuration to tailor the transformation process to your project's needs.
{
'presets': [['@babel/preset-env', { 'targets': { 'node': 'current' } }]],
'plugins': ['@babel/plugin-proposal-class-properties']
}
ts-jest is a TypeScript preprocessor with source map support for Jest. It allows you to use Jest to test projects written in TypeScript. It is similar to babel-jest but specifically tailored for TypeScript rather than general Babel transformations.
jest-transform-stub is a package that allows you to stub out resources, like images or styles, during testing with Jest. It is similar to babel-jest in that it transforms assets, but it focuses on non-JavaScript assets instead of JavaScript code.
jest-vue-preprocessor is a preprocessor for Jest to handle .vue files, allowing you to test Vue components. It is similar to babel-jest in the sense that it preprocesses files for testing, but it is specifically designed for Vue components.
If you are already using jest-cli
, just add babel-jest
and it will automatically compile JavaScript code using babel.
npm install --save babel-jest
If you would like to write your own preprocessor, uninstall and delete babel-jest and set the config.scriptPreprocessor option to your preprocessor.
jest 13.0.0
browser
config option to properly resolve npm packages with a browser field in package.json
if you are writing tests for client side appsjest-repl
.jest-cli
into jest-runtime
and jest-config
.--notify
.TestRunner
into SearchSource
and improved the "no tests found" message.jest.isMockFunction(jest.fn())
to test for mock functions.jest.mock('Module', implementation, {virtual: true})
.toMatchSnapshot()
.FAQs
Jest plugin to use babel for transformation.
The npm package babel-jest receives a total of 23,508,971 weekly downloads. As such, babel-jest popularity was classified as popular.
We found that babel-jest demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 3 open source maintainers collaborating on the project.
Did you know?
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