import type { JavaSet } from './JavaSet';
import type { Collection } from './Collection';
import type { JavaIterator } from './JavaIterator';
import type { HashMap } from './HashMap';
import { JavaObject } from '../../java/lang/JavaObject';
export declare class HashMapKeySet<K, V> extends JavaObject implements JavaSet<K> {
    protected readonly _map: HashMap<K, V>;
    constructor(map: HashMap<K, V>);
    size(): number;
    isEmpty(): boolean;
    contains(key: any): boolean;
    iterator(): JavaIterator<K>;
    toArray(): Array<unknown>;
    toArray<U>(a: Array<U>): Array<U>;
    add(e: K | null): boolean;
    remove(e: any): boolean;
    containsAll(c: Collection<any> | null): boolean;
    addAll(c: Collection<K> | null): boolean;
    removeAll(c: Collection<any> | null): boolean;
    retainAll(c: Collection<any> | null): boolean;
    clear(): void;
    [Symbol.iterator](): Iterator<K, any, undefined>;
    transpilerCanonicalName(): string;
}
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