A brief walkthrough on how to upgrade Vite from JavaScript to TypeScript. The tutorial assumes that you have already created a React project with Vite in JavaScript. To use TypeScript in React (with Vite), install TypeScript and its dependencies into your application using the command line:
npm install typescript @types/react @types/react-dom --save-dev
Add two TypeScript configuration files; one for the browser environment and one for the Node environment:
touch tsconfig.json tsconfig.node.json
In the TypeScript file for the browser environment include the following configuration:
{"compilerOptions": {"target": "ESNext","useDefineForClassFields": true,"lib": ["DOM", "DOM.Iterable", "ESNext"],"allowJs": false,"skipLibCheck": true,"esModuleInterop": false,"allowSyntheticDefaultImports": true,"strict": true,"forceConsistentCasingInFileNames": true,"module": "ESNext","moduleResolution": "Node","resolveJsonModule": true,"isolatedModules": true,"noEmit": true,"jsx": "react-jsx"},"include": ["src"],"references": [{ "path": "./tsconfig.node.json" }]}
Then In the TypeScript file for the Node environment include some more configuration:
{"compilerOptions": {"composite": true,"module": "ESNext","moduleResolution": "Node","allowSyntheticDefaultImports": true},"include": ["vite.config.ts"]}
Next, rename all JavaScript files (.jsx) to TypeScript files (.tsx).
mv src/main.jsx src/main.tsxmv src/App.jsx src/App.tsx
And in your index.html file, reference the new TypeScript file instead of a JavaScript file:
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8" /><link rel="icon" type="image/svg+xml" href="/vite.svg" /><meta name="viewport" content="width=device-width, initial-scale=1.0" /><title>Vite + React</title></head><body><div id="root"></div><script type="module" src="/src/main.tsx"></script></body></html>
Restart your development server on the command line. You may encounter compile errors in the browser and editor/IDE. If you don't see any errors in your editor/IDE when opening the renamed TypeScript files (e.g. src/App.tsx), try installing a TypeScript plugin for your editor or a TypeScript extension for your IDE. Usually you should see red lines under all the values where TypeScript definitions are missing. That's it. You should have a running TypeScript in Vite project now.
