swc binding for the jest
# if you use npm
npm i -D jest @swc/core @swc/jest
# if you use yarn
yarn add -D jest @swc/core @swc/jestjest.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: 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.jsMIT
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