Modern JavaScript development often benefits from using Node.js with TypeScript, leveraging its type safety and enhanced tooling for scalability. This is further amplified by integrating a robust bundler, testing framework, and automatic reloading. This article guides you through setting up a Node.js project with TypeScript, Rollup, Jest, and Nodemon for a streamlined development experience.
Simplifying the Node.js TypeScript Setup
Configuring a Node.js project with TypeScript can be complex, involving multiple tools and configurations. This often leads to a cumbersome workflow. This article presents a simplified approach using the latest tools, addressing common setup challenges:
- TypeScript: Provides type safety.
- Rollup (with esbuild): A fast and efficient bundler.
- Jest: A comprehensive testing framework.
- Nodemon: Enables automatic application reloading during development.
-
Simplified Imports: Eliminates the need to specify
.js
extensions in import statements.
This configuration streamlines the development process, making it more efficient and maintainable.
Getting Started: Prerequisites
Before you begin, ensure you have:
- Node.js installed.
- A foundational understanding of TypeScript and Node.js.
Project Setup: A Step-by-Step Guide
Let's create a basic Node.js project with TypeScript:
-
Project Directory: Create a new project directory and navigate to it:
mkdir my-ts-app cd my-ts-app
-
Package Initialization: Initialize a
package.json
file:npm init -y
-
Dependency Installation: Install the required dependencies:
npm install --save-dev typescript ts-node @types/node tslib ts-jest rollup rollup-plugin-esbuild nodemon jest @rollup/plugin-node-resolve @rollup/plugin-commonjs
-
TypeScript Configuration (
tsconfig.json
): Configure TypeScript for the Node.js environment:{ "compilerOptions": { "target": "ESNext", "module": "ESNext", "outDir": "./dist", "strict": true, "esModuleInterop": true, "moduleResolution": "node", "skipLibCheck": true, "resolveJsonModule": true, "declaration": true, "sourceMap": true }, "include": ["src/**/*"], "exclude": ["node_modules", "dist", "tests"] }
-
Rollup Configuration (
rollup.config.js
): Configure Rollup for production builds:import resolve from '@rollup/plugin-node-resolve'; import commonjs from '@rollup/plugin-commonjs'; import esbuild from 'rollup-plugin-esbuild'; export default { input: './src/index.ts', output: { dir: 'dist', format: 'esm', sourcemap: true, banner: '#!/usr/bin/env node' }, plugins: [ resolve(), commonjs(), esbuild({ target: 'esnext', sourceMap: true, minify: true }) ] };
-
Jest Configuration (
jest.config.js
): Configure Jest for testing:/** @type {import('ts-jest').JestConfigWithTsJest} **/ export default { testEnvironment: "node", transform: { "^.+.tsx?$": ["ts-jest",{}] } };
-
Nodemon Configuration (
nodemon.json
): Configure Nodemon for automatic reloading:{ "watch": ["src"], "ext": "ts,json", "ignore": ["src/**/*.spec.ts"], "exec": "npm start" }
-
Create Source Files: Create
src/index.ts
andsrc/functions/addition.ts
(example files provided in original prompt). -
Create Test Files: Create test files (e.g.,
tests/functions/addition.spec.ts
). -
Project Structure: Your project should have a structure similar to the one outlined in the original prompt.
Running the Application
-
Build:
npm run build
-
Run:
npm start
-
Develop (with auto-reload):
npm run dev
-
Test:
npm test
Conclusion
This setup provides a streamlined and efficient environment for developing Node.js applications with TypeScript. Remember to adjust the configurations to fit your specific project needs. This is a foundation for building robust and scalable applications.
The above is the detailed content of A Complete Node.js TypeScript Setup with Rollup, Jest, and Nodemon. For more information, please follow other related articles on the PHP Chinese website!

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