import { Type } from './lang';
export declare class PolyfillMap<K, V> implements Map<K, V> {
    [Symbol.toStringTag]: any;
    ks: K[];
    vs: V[];
    get size(): number;
    clear(): void;
    delete(key: K): boolean;
    forEach(callbackfn: (value: V, key: K, map: Map<K, V>) => void, thisArg?: PolyfillMap<K, V>): void;
    get(key: K): V | undefined;
    has(key: K): boolean;
    set(key: K, value: V): this;
    [Symbol.iterator](): IterableIterator<[K, V]>;
    entries(): IterableIterator<[K, V]>;
    keys(): IterableIterator<K>;
    values(): IterableIterator<V>;
    /**
     * return -1 if not found
     * */
    private getIndex;
}
export declare function polyfillMap<K, V>(): Type<Map<K, V>>;