Tsconfig

Add a tsconfig.json with these settings:

{
  "compilerOptions": {
    "target": "ES2020",
    "module": "ESNext",
    "moduleResolution": "bundler",
    "strict": true,
    "noEmit": true,
    "types": ["chrome", "vitest/globals"],
    "lib": ["ES2020", "DOM", "DOM.Iterable"]
  },
  "include": ["src"]
}

Key options:

• "moduleResolution": "bundler" — required for Vite to resolve ES modules correctly
• "types": ["chrome"] — enables IntelliSense and type checking for Chrome extension APIs (chrome.storage, chrome.runtime, etc.); remove if not building a Chrome extension
• "noEmit": true — lets TypeScript do type checking without conflicting with Vite's compilation
• "target": "ES2020" — enables async/await, optional chaining, and other modern syntax
• "strict": true — catches bugs early and enforces consistent coding patterns

Install the Chrome types package if building a Chrome extension:

pnpm add --save-dev @types/chrome