30 lines
847 B
Plaintext
30 lines
847 B
Plaintext
---
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title: Detect when code is executed with Bun
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sidebarTitle: Detect Bun
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mode: center
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---
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Check `process.versions.bun` to detect whether code is running in Bun. This works in both JavaScript and TypeScript without extra type definitions.
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```ts
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if (process.versions.bun) {
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// this code will only run when the file is run with Bun
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}
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```
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---
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Alternatively, check for the `Bun` global, the same way you'd check for `window` to detect a browser.
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<Note>
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In TypeScript, this check is a type error unless `@types/bun` is installed. Install it with `bun add -d @types/bun`.
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If you're using TypeScript 6.0 or later, you also need `"types": ["bun"]` in your `compilerOptions`. See [TypeScript 6
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and 7](/typescript-6) for details.
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</Note>
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```ts
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if (typeof Bun !== "undefined") {
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// this code will only run when the file is run with Bun
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}
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```
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