type MergeKey<T> = keyof T;
declare global {
    interface Array<T> {
        mergeWith<U>(otherArray: U[], mergeKey: MergeKey<T & U>): Array<T | U>;
    }
}
declare function mergeWith<T, U>(this: T[], otherArray: U[], mergeKey: MergeKey<T & U>): Array<T | U>;
export { mergeWith };