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Maciek Grzybek
Maciek Grzybek

Posted on • Updated on

Setup Next.js with Typescript , Jest and React Testing Library

#react #typescript #testing #nextjs

Why?

Next.js is a super cool React framework, that gives you an amazing developer experience. In this episode, I'll show you how to set it up with Typescript, Jest and React Testing Library.

Setup

To set up the project we'll need to follow these steps:

  • to create Next app, from your terminal run 
npx create-next-app
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  • install typescript as well as react and node types 
npm install typescript @types/react @types/node -D
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  • install jest, react testing library, babel-jest, @testing-library/jest-dom and types for jest 
npm i jest @testing-library/react @types/jest babel-jest @testing-library/jest-dom @testing-library/user-event @testing-library/dom -D
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  • create config files for typescript and babel 
touch tsconfig.json
touch .babelrc
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  • add to the babel config file 
{
  "presets": ["next/babel"]
}
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  • create jest.config.js and jest.setup.ts files 
// jest.config.js
module.exports = {
  setupFilesAfterEnv: ['<rootDir>/jest.setup.ts'],
  testPathIgnorePatterns: ['<rootDir>/.next/', '<rootDir>/node_modules/'],
};
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// jest.setup.ts
import '@testing-library/jest-dom';
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  • start the app so next can configure typescript 
npm run dev
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BONUS

If you're going to use CSS modules, make sure you also include these steps:

npm i identity-obj-proxy -D
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  • update jest.config.js file to look like this 
module.exports = {
  setupFilesAfterEnv: ['<rootDir>/jest.setup.ts'],
  testPathIgnorePatterns: ['<rootDir>/.next/', '<rootDir>/node_modules/'],
  moduleNameMapper: {
    '\\.(scss|sass|css)$': 'identity-obj-proxy',
  },
};
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Now we are good to go, you can start changing your component from .js to .tsx and building your awesome app.

Top comments (8)

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kastinpl profile image
KASTIN.pl •

it's good to mention also one more thing: if you use a tsconfig.json -> compilerOptions.baseUrl config for absolute paths feature, you have to add:

moduleDirectories: ['node_modules', 'src']
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to your jest.config.js

source: stackoverflow.com/a/51174924/3999031

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spences10 profile image
Scott Spence •

Brillsies!!!

This helped me, thank you 🙏

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maciekgrzybek profile image
Maciek Grzybek •

Glad I could help :)

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matthew_inamdar profile image
Matt Inamdar •

Exactly what I was looking for. Amazing!

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arthur322 profile image
Arthur Conrado de Lima •

Thank you a lot! Awesome! đź‘Źđź‘Źđź‘Ź

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maciekgrzybek profile image
Maciek Grzybek •

Glad I could help :)

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dhaiwat10 profile image
Dhaiwat Pandya •

Thank you so much!

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minmaxdata profile image
Karen McAdams •

looking for a solution that uses SWC and not babel

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