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Update isolatedModules docs to match 5.0+ behavior #2951

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Oct 3, 2023
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Update isolatedModules docs to match 5.0+ behavior #2951

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874b1db
Update isolatedModules.md
iisaduan Oct 2, 2023
d7323ef
Update isolatedModules.md
iisaduan Oct 2, 2023
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8 changes: 5 additions & 3 deletions packages/tsconfig-reference/copy/en/options/isolatedModules.md
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Expand Up @@ -37,12 +37,14 @@ Single-file transpilers don't know whether `someType` produces a value or not, s

#### Non-Module Files

If `isolatedModules` is set, all implementation files must be _modules_ (which means it has some form of `import`/`export`). An error occurs if any file isn't a module:
If `isolatedModules` is set, namespaces are only allowed in _modules_ (which means it has some form of `import`/`export`). An error occurs if a namespace is found in a non-module file:

```ts twoslash
// @errors: 1208
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I wasn't sure if we should add that this error is now made by moduleDetection: "force"

// @errors: 1277
// @isolatedModules
function fn() {}
namespace Instantiated {
export const x = 1;
}
```

This restriction doesn't apply to `.d.ts` files.
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