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Update extending.md

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Jarred Sumner
2023-05-21 01:20:21 -07:00
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@@ -85,7 +85,7 @@ typeof globalThis.describe; // "undefined"
typeof describe; // "function"
```
This works via a transpiler integration in Bun. This transpiler plugin is only enabled inside test files and when preloading scripts. If you try to use these functions otherwise, you will get an error.
This works via a transpiler integration in Bun. When `describe`, `expect`, `it`, etc are used in a test file, the transpiler auto-imports from `bun:test`. This transpiler plugin is only enabled inside test files and when preloading scripts. If you try to use Jest globals in other files, you will get an error.
Every `describe`, `test`, and `expect` is scoped to the current test file. Importing from `"bun:test"` creates a new scope. This means you can't use `describe` from one test file in another test file because belong to different scopes.