Type Alias MergeTypes<Target, Source>

MergeTypes: {
    [K in keyof Target | keyof Source]: K extends keyof Source
        ? K extends keyof Target
            ? MergePropertyValues<Target[K], Source[K]>
            : Source[K]
        : K extends keyof Target ? Target[K] : never
}

Smart merge type that properly handles nested object merging with support for Arrays, Maps, and Sets

Type Parameters

Target
Source

Example

type Result = MergeTypes<
  { a: number; nested: { x: string } },
  { b: string; nested: { y: number } }
>;
// Result: { a: number; b: string; nested: { x: string; y: number } }