Package Exports

@swc/jest

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (@swc/jest) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

@swc/jest

swc binding for the jest

Installation

# if you use npm
npm i -D jest @swc/core @swc/jest
# if you use yarn
yarn add -D jest @swc/core @swc/jest

Usage

jest.config.js:

module.exports = {
  transform: {
    '^.+\\.(t|j)sx?$': '@swc/jest',
  },
}

It will load swc configuration from .swcrc in default. You also can custom it:

const fs = require('fs')

const config = JSON.parse(fs.readFileSync(`${__dirname}/.swcrc`, 'utf-8'))

module.exports = {
  transform: {
    '^.+\\.(t|j)sx?$': ['@swc/jest', { ...config, /* custom configuration in jest */ }],
  },
}

Q & A

Q: Jest use CommonJS in default. But I want to use ESM.

A: Setup Jest following this Guide.

For JavaScript, it need to configure package.json:

{
  // ...
  "type": "module"
}

For TypeScript, it need some configuration in jest.config.js:

module.exports = {
  // ...
  extensionsToTreatAsEsm: ['.ts', '.tsx'],
}

Run test with --experimental-vm-modules:

cross-env NODE_OPTIONS=--experimental-vm-modules jest

# or
node --experimental-vm-modules ./node_modules/jest/bin/jest.js

License

MIT