Jest Setup for TypeScript with ts-jest
Install and configure ts-jest for a TypeScript project.
Jest Setup for TypeScript with ts-jest is a free TypeScript Academy lesson on CoddyKit. This is lesson 1 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the TypeScript Academy learning path, and your progress syncs across the web and the CoddyKit app. The TypeScript Academy course includes 4 lessons in total.
Welcome
Installing ts-jest
npm install --save-dev jest ts-jest @types/jest typescriptjest.config.ts
export default {
preset: 'ts-jest',
testEnvironment: 'node',
globals: { 'ts-jest': { tsconfig: 'tsconfig.json' } },
};tsconfig for Tests
{ "extends": "./tsconfig.json", "compilerOptions": { "types": ["jest"] } }Running Tests
npx jest
npx jest --watch
npx jest --coverageVitest Alternative
npm install --save-dev vitest
// vitest.config.ts: { test: { environment: 'node' } }SWC Transform for Speed
npm install --save-dev @swc/core @swc/jest
// jest.config.ts: transform: { "^.+\.[tj]s$": ["@swc/jest"] }Path Aliases in Tests
{ moduleNameMapper: { '^@/(.*)$': '<rootDir>/src/$1' } }Test File Naming
Type Checking in Tests
// ts-jest: { diagnostics: false } — disable type checking for speedESM Support
NODE_OPTIONS=--experimental-vm-modules npx jestQuick Check
Recap
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Write and run real code in your browser, get instant help from a 24/7 AI tutor, and pick up where you left off on the web or in the app.
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Frequently Asked Questions
Is the “Jest Setup for TypeScript with ts-jest” lesson free?
Yes — the full text of “Jest Setup for TypeScript with ts-jest” is free to read here on the web. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the TypeScript Academy course, upgrade to CoddyKit PRO. The TypeScript Academy course includes 4 lessons in total.
What will I learn in “Jest Setup for TypeScript with ts-jest”?
Install and configure ts-jest for a TypeScript project. You practise TypeScript Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start TypeScript Academy?
No prior experience is required. TypeScript Academy on CoddyKit is structured for beginners through advanced learners, so you can start here or from the beginning and move at your own pace. This is lesson 1 of 4.
How long does the “Jest Setup for TypeScript with ts-jest” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this TypeScript Academy lesson?
Yes. Every TypeScript Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- Jest Setup for TypeScript with ts-jest
- Writing Type-Safe Unit Tests
- Mocking Modules and Functions in TypeScript
- Type Testing with expectTypeOf and tsd