export type IdOf<T> = (x: T) => string;
export type Diff<X, Y> = {
    distinctXs: X[];
    distinctYs: Y[];
    commonXs: X[];
    commonYs: Y[];
};
export declare function diffArrays<X, Y>(idOfX: IdOf<X>, idOfY: IdOf<Y>, xs: X[], ys: Y[]): Diff<X, Y>;