TypeScript 6 and 7

How to configure Bun’s type definitions for TypeScript 6.0 and 7.0, which no longer auto-discover @types packages. Fix ‘Cannot find name Bun’ and other missing type errors after upgrading TypeScript.

TypeScript 6.0 changed how type definitions are discovered. If you’ve upgraded TypeScript and your editor no longer recognizes Bun, Request, or other globals from @types/bun, here’s how to fix it.

What changed

Starting in TypeScript 6.0, the types field in compilerOptions defaults to an empty array instead of including all @types/* packages. You now need to explicitly list the type packages you use.

Add "types": ["bun"] to your tsconfig

In your tsconfig.json, add "types": ["bun"] to compilerOptions:

tsconfig.json

{
  "compilerOptions": {
    "types": ["bun"], 
  },
}

The types array tells TypeScript to load type definitions from @types/bun. If you use other @types/* packages, include them too:

tsconfig.json

{
  "compilerOptions": {
    "types": ["bun", "react"],
  },
}

You still need @types/bun installed — the types option tells TypeScript which packages to include, but the package itself must exist in node_modules:

terminal

bun add -d @types/bun

Full recommended tsconfig.json

Here’s the full recommended tsconfig.json for a Bun project using TypeScript 6.0 or later:

tsconfig.json

{
  "compilerOptions": {
    // Environment setup & latest features
    "lib": ["ESNext"],
    "target": "ESNext",
    "module": "Preserve",
    "moduleDetection": "force",
    "jsx": "react-jsx",
    "allowJs": true,
    "types": ["bun"],

    // Bundler mode
    "moduleResolution": "bundler",
    "allowImportingTsExtensions": true,
    "verbatimModuleSyntax": true,
    "noEmit": true,

    // Best practices
    "strict": true,
    "skipLibCheck": true,
    "noFallthroughCasesInSwitch": true,
    "noUncheckedIndexedAccess": true,
    "noImplicitOverride": true,

    // Some stricter flags (disabled by default)
    "noUnusedLocals": false,
    "noUnusedParameters": false,
    "noPropertyAccessFromIndexSignature": false,
  },
}

Does this apply to TypeScript 7?

Yes. TypeScript 7 carries forward the same default. If you’re upgrading directly from TypeScript 5 to 7, the same fix applies — add "types": ["bun"] to your compilerOptions.