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docs(desktop): add type checking section to desktop configuration doc #3456

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17 changes: 16 additions & 1 deletion runtime/desktop/configuration.md
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
---
last_modified: 2026-06-30
last_modified: 2026-08-18
title: "Configuration"
description: "Configure deno desktop in deno.json: app metadata, icons, deep-link URL schemes, backend selection, output paths, error reporting, and the auto-update server."
---
Expand Down Expand Up @@ -272,3 +272,18 @@ Configuration is validated at the start of `deno desktop`:
- `app.deepLinks` entries must be valid, non-reserved URL schemes.

Errors are reported with the offending `deno.json` location.

## Type checking

By default, Deno type-checks code against the runtime's global scope (the
`deno.window` library), which does not include desktop-only types such as
[`Deno.BrowserWindow`](/api/deno/~/Deno.BrowserWindow). To get editor
completions from the language server, set `compilerOptions.lib` in `deno.json`:

```json title="deno.json"
{
"compilerOptions": {
"lib": ["deno.desktop", "deno.unstable", "node"]
}
}
```
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