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Switch to ESM Jest config in docs #42144

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merged 3 commits into from
Mar 28, 2023
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Switch to ESM Jest config in docs #42144

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Switch to ESM Jest config in docs
karlhorky Oct 29, 2022
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Remove semicolon
karlhorky Oct 29, 2022
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Merge branch 'canary' into patch-1
shuding Mar 28, 2023
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10 changes: 5 additions & 5 deletions docs/testing.md
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Original file line number Diff line number Diff line change
Expand Up @@ -304,11 +304,11 @@ To set up Jest, install `jest`, `jest-environment-jsdom`, `@testing-library/reac
npm install --save-dev jest jest-environment-jsdom @testing-library/react @testing-library/jest-dom
```

Create a `jest.config.js` file in your project's root directory and add the following:
Create a `jest.config.mjs` file in your project's root directory and add the following:

```jsx
// jest.config.js
const nextJest = require('next/jest')
// jest.config.mjs
import nextJest from 'next/jest.js'

const createJestConfig = nextJest({
// Provide the path to your Next.js app to load next.config.js and .env files in your test environment
Expand All @@ -317,15 +317,15 @@ const createJestConfig = nextJest({

// Add any custom config to be passed to Jest
/** @type {import('jest').Config} */
const customJestConfig = {
const config = {
// Add more setup options before each test is run
// setupFilesAfterEnv: ['<rootDir>/jest.setup.js'],

testEnvironment: 'jest-environment-jsdom',
}

// createJestConfig is exported this way to ensure that next/jest can load the Next.js config which is async
module.exports = createJestConfig(customJestConfig)
export default createJestConfig(config)
```

Under the hood, `next/jest` is automatically configuring Jest for you, including:
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