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---
name: Install TypeScript declarations for Bun
---
To install TypeScript definitions for Bun's built-in APIs in your project, install `bun-types`.
```sh
$ bun add -d bun-types # dev dependency
```
---
Then include `"bun-types"` in the `compilerOptions.types` in your `tsconfig.json`:
```json-diff
{
"compilerOptions": {
+ "types": ["bun-types"]
}
}
```
---
Unfortunately, setting a value for `"types"` means that TypeScript will ignore other global type definitions, including `lib: ["dom"]`. If you need to add DOM types into your project, add the following [triple-slash directives](https://www.typescriptlang.org/docs/handbook/triple-slash-directives.html) at the top of any TypeScript file in your project.
```ts
/// <reference lib="dom" />
/// <reference lib="dom.iterable" />
```
---
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.
```jsonc
{
"compilerOptions": {
// add Bun type definitions
"types": ["bun-types"],
// enable latest features
"lib": ["esnext"],
"module": "esnext",
"target": "esnext",
// if TS 5.x+
"moduleResolution": "bundler",
"noEmit": true,
"allowImportingTsExtensions": true,
"moduleDetection": "force",
// if TS 4.x or earlier
// "moduleResolution": "nodenext",
"jsx": "react-jsx", // support JSX
"allowJs": true, // allow importing `.js` from `.ts`
"esModuleInterop": true, // allow default imports for CommonJS modules
// best practices
"strict": true,
"forceConsistentCasingInFileNames": true,
"skipLibCheck": true
}
}
```
---
Refer to [Ecosystem > TypeScript](/docs/runtime/typescript) for a complete guide to TypeScript support in Bun.
|
