merge-anything

concatArrays: <T>(originVal: unknown, newVal: T) => T;

merge: <T, Tn extends unknown[]>(object: T, ...otherObjects: Tn) => Merge<T, Tn>;

mergeAndCompare: <T, Tn extends unknown[]>(
    compareFn: (prop1: unknown, prop2: unknown, propName: string | symbol) => any,
    object: T,
    ...otherObjects: Tn
) => Merge<T, Tn>;

mergeAndConcat: <T, Tn extends unknown[]>(
    object: T,
    ...otherObjects: Tn
) => Merge<T, Tn>;

type Merge<T, Ts extends unknown[]> = T extends Record<
    string | number | symbol,
    unknown
>
    ? Ts extends Record<string | number | symbol, unknown>[]
        ? PrettyPrint<Assign<T, Ts>>
        : Pop<Ts>
    : Pop<Ts>;