TypeScript 3.5 focused heavily on speed. The type-checker was optimized to be much faster, especially in "editor scenarios" like the Playground, where code completion lists are generated in real-time.
let data: DeepReadonly<ApiResponse>; data.user.settings.theme = "dark"; // Error: Cannot assign to 'theme' ts playground 35
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Adult reports often highlight the cast as the primary metric of quality. Entries in this series typically feature a mix of: TypeScript 3