Socket
Socket
Sign inDemoInstall

babel-jest

Package Overview
Dependencies
7
Maintainers
3
Versions
279
Alerts
File Explorer

Advanced tools

Install Socket

Detect and block malicious and high-risk dependencies

Install

babel-jest

Jest plugin to use babel for transformation.


Version published
Weekly downloads
21M
decreased by-15.06%
Maintainers
3
Created
Weekly downloads
 

Package description

What is babel-jest?

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.

What are babel-jest's main functionalities?

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']
}

Other packages similar to babel-jest

Readme

Source

babel-jest

Babel jest plugin

Usage

If you are already using jest-cli, add babel-jest and it will automatically compile JavaScript code using Babel.

yarn add --dev babel-jest @babel/core

If you would like to write your own preprocessor, uninstall and delete babel-jest and set the config.transform option to your preprocessor.

Setup

Note: this step is only required if you are using babel-jest with additional code preprocessors.

To explicitly define babel-jest as a transformer for your JavaScript code, map .js files to the babel-jest module. Typescript files are also supported.

"transform": {
  "\\.[jt]sx?$": "babel-jest"
},

FAQs

Package last updated on 20 Feb 2024

Did you know?

Socket

Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.

Install

Related posts

SocketSocket SOC 2 Logo

Product

  • Package Alerts
  • Integrations
  • Docs
  • Pricing
  • FAQ
  • Roadmap

Packages

Stay in touch

Get open source security insights delivered straight into your inbox.


  • Terms
  • Privacy
  • Security

Made with ⚡️ by Socket Inc