README.md

1. Environment

• WSL (Ubuntu 25.10)
• Node v25.9.0
• PNPM 10.30.3

2. Reference

• TypeScript
• TypeScript + Node.js プロジェクトのはじめかた2020

3. Run TypeScript

3-1. tsc

tsc converts TypeScript to JavaScript and run the file.

$ pnpm install typescript
$ pnpm tsc --noEmit
$ node ./lib/user_account.js
=> ID: 1, Name: User1

3-2. ts-node

ts-node directly runs TypeScript file.

$ pnpm dlx ts-node ./lib/user_account.ts
=> ID: 1, Name: User1

4. JEST install for Unit Test

4-1. Build a Node.js project

$ pnpm init

You will be asked some questions, but just keep tapping "Enter" key.

4-2. Install required packages

$ pnpm install --save-dev jest babel-jest babel-core @babel/core @babel/preset-env

4-3. Install a plugin with babel to convert JEST to CommonJS

$ pnpm install --save-dev jest babel-jest

4-4. Run a unittest

To execute all unit tests, run pnpm exec jest.

$ pnpm exec jest
 PASS  __tests__/hello.test.js (24.047 s)
  ✓ Hello (3 ms)

Test Suites: 1 passed, 1 total
Tests:       1 passed, 1 total
Snapshots:   0 total
Time:        48.781 s
Ran all test suites.

---

To execuate a unittest, run pnpm exec jest ./__test__/{filename}_test.js.

$ pnpm exec jest ./basic/__tests__/hello_test.js
PASS  basic/__tests__/hello_test.js (15.283 s)
 ✓ hello (2 ms)

Test Suites: 1 passed, 1 total
Tests:       1 passed, 1 total
Snapshots:   0 total
Time:        38.076 s
Ran all test suites matching /basic\/__tests__\/hello_test.js/i.