export declare class BinaryTreeMap<V, K extends {
    [index: number]: number;
} = {
    [index: number]: number;
}> implements Map<K, V> {
    private _tree;
    clear(): void;
    delete(key: K): boolean;
    forEach(callbackfn: (value: V, key: K, map: Map<K, V>) => void, thisArg?: any): void;
    get(key: K): V | undefined;
    has(key: K): boolean;
    set(key: K, value: V): this;
    size: number;
    [Symbol.iterator](): IterableIterator<[K, V]>;
    entries(): IterableIterator<[K, V]>;
    keys(): IterableIterator<K>;
    values(): IterableIterator<V>;
    [Symbol.toStringTag]: string;
}