Playground 35 | Ts

let data: DeepReadonly<ApiResponse>; data.user.settings.theme = "dark"; // Error: Cannot assign to 'theme'

Paste your favorite type puzzle. See what breaks — or beautifully, finally, works. ts playground 35

Happy typing. — The TypeScript Playground Team let data: DeepReadonly&lt;ApiResponse&gt;; data

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Date: April 14, 2026 Author: TypeScript Team / Community Spotlight let data: DeepReadonly&lt