TypeScript pick overlapping properties

pickOverlapping.ts

type Overlap<T, U> = { [K in keyof T & keyof U]: U[K] };

/**
 * Return an object with only the properties existing on both objects, values equal to what's on the latter object.
 */
export function pickOverlapping<T, U>(obj1: T, obj2: U): Overlap<T, U> {
    const ret: any = {};
    for (const k in obj2) {
        if (k in obj1) {
            ret[k] = obj2[k];
        }
    }
    return ret;
}