Testing with Jest
Transformer

Testing with Jest

react-native-esbuild/jest is a Jest (opens in a new tab) transformer.

It can replace babel-jest (opens in a new tab) and supports the React Native testing environment.

Setup

Requirements: Jest>=27

# using npm
npm install -D @react-native-esbuild/jest
 
# using yarn
yarn add -D @react-native-esbuild/jest

Open your jest.config.js and set @react-native-esbuild/jest as transformer.

// Many react-native npm modules unfortunately don't pre-compile their source code before publishing.
// If you have npm dependencies that have to be transformed you can add the package name to list. 
const TRANSFORM_PACKAGES = [
  'react-native',
  'jest-react-native',
  '@react-native',
  '@react-native-community',
  '@react-navigation',
  // ...
];
 
/**
 * @type {import('jest').Config}
 */
module.exports = {
  preset: 'react-native',
  transform: {
    '^.+\\.(t|j)sx?$': '@react-native-esbuild/jest',
  },
  transformIgnorePatterns: [
    `node_modules/(?!${TRANSFORM_PACKAGES.join('|')})/`,
  ],
};
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