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To install TypeScript definitions for Bun’s built-in APIs in your project, install @types/bun.
terminal
bun add -d @types/bun # dev dependency
Below is the full set of recommended compilerOptions for a Bun project. With this tsconfig.json, you can use top-level await, extensioned or extensionless imports, and JSX.
tsconfig.json
{  "compilerOptions": {  // Environment setup & latest features  "lib": ["ESNext"],  "target": "ESNext",  "module": "Preserve",  "moduleDetection": "force",  "jsx": "react-jsx",  "allowJs": true,   // 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  } }
Refer to Ecosystem > TypeScript for a complete guide to TypeScript support in Bun.