TypeScript NPM Package

Scaffold TypeScript npm packages using this template to bootstrap your next library.

This project includes:

• TypeScript
• Rollup
• Microsoft API Extractor
• TypeDoc

Versions of this template:

• Vite TypeScript library npm package
• Vite JavaScript library npm package
• Rollup JavaScript library npm package
• Rollup TypeScript library npm package

Getting Started

Begin via any of the following:

• Press the "Use this template" button

• Use degit to execute:

  degit github:jasonsturges/typescript-npm-package

• Use GitHub CLI to execute:

  gh repo create <name> --template="https://github.com/jasonsturges/typescript-npm-package"

• Simply git clone, delete the existing .git folder, and then:

  git init
  git add -A
  git commit -m "Initial commit"

Remember to use npm search <term> to avoid naming conflicts in the NPM Registery for your new package name.

Usage

The following tasks are available for npm run:

• dev: Run Rollup in watch mode to detect changes to files during development
• build: Run Rollup to build a production release distributable
• build:types: Run Microsoft API Extractor to rollup a types declaration (d.ts) file
• docs: Run TypeDoc for TSDoc generated documentation in the "docs/" folder
• clean: Remove all build artifacts

Development

While test driven development (TDD) would be a good approach to develop your library, also consider creating an app for prototyping and local testing of your library.

To test within the library, consider using Storybook. This approach runs a storybook script to load local source files for development.

Otherwise, follow these steps to test the package from another project:

From your library project, issue the npm link (or yarn link) command:

npm link

Start Rollup in watch mode:

npm run dev

Create a test app project, by doing the following:

To use your npm package library locally for development, create a new project in a separate folder:

mkdir test-app && cd test-app
npm init

Take the defaults from npm init; then, add TypeScript:

npm install typescript --save-dev

In the package.json of your test app, add the following two things:

• Set the type of your package to module
• Add a start script to execute your app

"type": "module",
"scripts": {
  "start": "tsc && node index.js",
},

Link to your library using the npm link <name> (or yarn link <name>) command - be sure the <name> matches your library's package.json name. For example:

npm link typescript-npm-package

Add a "tsconfig.json" file to your test app that includes a baseUrl and references the paths to your npm linked module. Again, be sure the paths name matches your library's package.json name. For example:

{
  "compilerOptions": {
    "target": "es6",
    "module": "esnext",
    "moduleResolution": "node",
    "strict": true,
    "esModuleInterop": true,
    "baseUrl": ".",
    "paths": {
      "typescript-npm-package": ["node_modules/typescript-npm-package/src"],
      "typescript-npm-package/*": ["node_modules/typescript-npm-package/src/*"]
    }
  }
}

Now, run your app via npm start.

As an example, if your library's "index.ts" file contained:

export const sayHi = () => {
  console.log("Hi");
};

...your test app would implement an import using your package name, such as:

import { sayHi } from "typescript-npm-package";

sayHi();

Development Cleanup

Once development completes, unlink both your library and test app projects.

From your test app project, unlink the library using npm unlink <name> (or yarn unlink <name>) command:

npm unlink typescript-npm-package

From your library project, issue the npm unlink (or yarn unlink) command:

npm unlink

Release Publishing

Update your package.json to next version number, and remember to tag a release.

Once ready to submit your package to the NPM Registry, execute the following tasks via npm (or yarn):

• npm run clean — Assure a clean build
• npm run build — Build the package
• npm run build:types — Build API Extractor d.ts declaration

Assure the proper npm login:

npm login

Submit your package to the registry:

npm publish --access public