@swc/jest

[SWC][] binding for Jest.

Installation

``sh


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:

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

It will load the SWC configuration from .swcrc by default. You also can customize it:

`js
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

$3

A: Setup Jest following this Guide.

For JavaScript, edit package.json as follows:

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

For TypeScript, edit jest.config.js as follows:

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

Run test with --experimental-vm-modules:

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

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

$3

A: By default, the version supported by your Node runtime.

| Node version | Default jsc.target |
|--------------|----------------------|
| 12 | 'es2018' |
| 13 | 'es2019' |
| 14 | 'es2020' |
| 15 | 'es2021' |
| 16 | 'es2021' |
| 17 | 'es2022' |
| 18 | 'es2023' |
| 19 | 'es2023' |
| 20 | 'es2023' |

You can customize this by setting an explicit version in jest.config.js:

`js
module.exports = {
transform: {
"^.+\\.(t|j)sx?$": [
"@swc/jest",
{
jsc: {
target: "es2021",
},
},
],
},
}
``

License

MIT

[SWC]: https://swc.rs