Type Alias DeepOptional<T>

DeepOptional: {
[K in keyof T]?: T[K] extends object ? DeepOptional<T[K]> : T[K]
}

Makes all properties in a nested object optional recursively.

Critical for partial update operations, configuration merging, and scenarios where deep object structures need incremental updates.

Type Parameters

T

Example

interface Config { api: { url: string; timeout: number; }; ui: { theme: string; }; }
function updateConfig(partial: DeepOptional<Config>): void
updateConfig({ api: { timeout: 5000 } }); // Only timeout is required