export declare type MapFunc<T, U> = (element: T) => U;
declare global {
    interface Map<K, V> {
        entries_to_array(this: Map<K, V>): [K, V][];
        entries_map_to_array<U>(this: Map<K, V>, fn: MapFunc<[K, V], U>): U[];
        keys_to_array(this: Map<K, V>): K[];
        keys_map_to_array<U>(this: Map<K, V>, fn: MapFunc<K, U>): U[];
        values_to_array(this: Map<K, V>): V[];
        values_map_to_array<U>(this: Map<K, V>, fn: MapFunc<V, U>): U[];
    }
}