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---
name: Detect when code is executed with Bun
---
The recommended way to conditionally detect when code is being executed with `bun` is to check for the existence of the `Bun` global.
This is similar to how you'd check for the existence of the `window` variable to detect when code is being executed in a browser.
```ts
if (typeof Bun !== "undefined") {
// this code will only run when the file is run with Bun
}
```
---
In TypeScript environments, the previous approach will result in a type error unless `bun-types` is globally installed. To avoid this, you can check `process.versions` instead.
```ts
if (process.versions.bun) {
// this code will only run when the file is run with Bun
}
```
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