use-vite

Use Vite as the build system and Vitest as the test tool.

ESM Configuration

Use ESM syntax in vite.config.js. Add "type": "module" to package.json so all *.js files are interpreted as ESM. If a file must stay CJS, use the .cjs extension.

Do not use the CJS build of Vite's Node API — it is deprecated and removed in Vite 6. Reference: https://vite.dev/guide/troubleshooting.html#vite-cjs-node-api-deprecated

vite-plugin-checker

Add vite-plugin-checker to run TypeScript type checking alongside the build:

1. Install:

pnpm add --save-dev vite-plugin-checker

1. Add to vite.config.js:

import { defineConfig } from 'vite';
import checker from 'vite-plugin-checker';

export default defineConfig({
  plugins: [
    checker({
      typescript: true,
    }),
  ],
});

Type errors appear in the browser overlay and terminal during development. The build fails if TypeScript errors are present — no separate type-check script needed.