TypeScript support in Next.js - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the first step to add TypeScript support in a new Next.js project?

Create a Next.js project normally, then add a tsconfig.json file or rename a page file to .tsx. Next.js will detect TypeScript and install necessary packages automatically.

beginner

How does Next.js handle TypeScript configuration by default?

Next.js provides a default tsconfig.json with recommended settings optimized for Next.js apps, so you don't need to configure it manually unless you want custom settings.

beginner

What file extensions are used for TypeScript files in Next.js?

Use .ts for plain TypeScript files and .tsx for files that include JSX (React components).

intermediate

Can you use TypeScript with Next.js API routes?

Yes, Next.js API routes support TypeScript. You can write your API handler files with .ts extensions and use type annotations for request and response objects.

intermediate

How does Next.js improve developer experience when using TypeScript?

Next.js automatically type checks your code during development and build. It also supports fast refresh with TypeScript and provides helpful error messages to catch mistakes early.

What happens when you add a tsconfig.json file to a Next.js project?

A Next.js installs TypeScript packages and configures the project automatically.

B Next.js ignores the file and continues with JavaScript.

C You must manually install TypeScript packages.

D The project stops working until you remove the file.

Next.js detects the tsconfig.json and installs required TypeScript packages automatically.

Which file extension should you use for React components written in TypeScript in Next.js?

A .jsx

B .ts

C .js

D .tsx

Use .tsx for files that contain JSX syntax, like React components.

Does Next.js support TypeScript in API route files?

A Yes, with .ts files.

B No, API routes must be JavaScript.

C Yes, but only with .js files.

D Only if you disable JavaScript support.

Next.js supports TypeScript in API routes using .ts files.

What benefit does Next.js provide when using TypeScript during development?

A No benefits, you must run separate tools.

B It disables JavaScript support.

C Automatic type checking and helpful error messages.

D Slower builds without error messages.

Next.js automatically type checks your code and shows clear errors to improve development.

If you want to customize TypeScript settings in Next.js, what should you do?

A You cannot customize TypeScript settings.

B Edit the default <code>tsconfig.json</code> created by Next.js.

C Create a JavaScript config file instead.

D Rename files to .js.

You can edit the tsconfig.json file to add or change TypeScript settings as needed.

Explain how to start using TypeScript in a new Next.js project and what happens behind the scenes.

Think about the simple steps and automatic setup Next.js provides.

Describe the advantages of using TypeScript with Next.js for both pages and API routes.

Focus on how TypeScript helps catch mistakes and improves coding confidence.