What does the following type utility compute? type DeepPartial = T extends object ? { [K in keyof T]?: DeepPartial } : T;

Question

TypeScript Professional — Hard

What does the following type utility compute? type DeepPartial = T extends object ? { [K in keyof T]?: DeepPartial } : T;

Accepted Answer

The DeepPartial type utility in TypeScript recursively makes all properties and nested properties optional, applying Partial semantics at every depth level. This means that it allows for optional properties within objects and nested objects.