esbuild preprocessor for Jest
npm install es-jestESM/React/TypeScript preprocessor for Jest, powered by esbuild.
``bash`
npm install es-jest --save-dev
Add preset to Jest config:
`json
{
"jest": {
"preset": "es-jest"
}
}
// alternatively, specifying the files to transform:
{
"jest": {
"transform": {
"\\.[jt]sx?$": "es-jest"
},
}
}
// you can also provide a custom esbuild config:
{
"jest": {
"transform": {
"\\.[jt]sx?$": ["es-jest", { "jsx": "automatic" }]
},
}
}
`
Write your tests with ES modules:
`js
import path from 'path'
test('parses extname', () => {
expect(path.extname('foo.md')).toBe('.md')
})
``
Happy testing!