/**
 * @module
 *
 * MeekSet data collection.
 */
/**
 * Like WeakSet.
 *
 * @template T Value type.
 */
export declare class MeekSet<T extends WeakKey = WeakKey> {
    /**
     * Type string.
     */
    readonly [Symbol.toStringTag]: string;
    /**
     * Create a new MeekSet.
     *
     * @param iterable Initial values.
     */
    constructor(iterable?: Iterable<T> | null);
    /**
     * Iterator for values in this set.
     *
     * @returns Set iterator.
     */
    [Symbol.iterator](): SetIterator<T>;
    /**
     * Add a value to this set.
     *
     * @param value Value to add.
     * @returns This set.
     */
    add(value: T): this;
    /**
     * Clear this set.
     */
    clear(): void;
    /**
     * Delete a value from this set.
     *
     * @param value Value to delete.
     * @returns Whether the value was deleted.
     */
    delete(value: T): boolean;
    /**
     * New MeekSet containing the values in this set not in other set.
     *
     * @param other Other set.
     * @returns New MeekSet.
     */
    difference<U>(other: ReadonlySetLike<U>): MeekSet<T>;
    /**
     * Iterator for key-value pairs in this set.
     *
     * @returns Key-value iterator.
     */
    entries(): SetIterator<[T, T]>;
    /**
     * Call a function for each value in this set.
     *
     * @param callbackfn Callback function.
     * @param thisArg This argument.
     */
    forEach(callbackfn: (value: T, value2: T, set: MeekSet<T>) => void, thisArg?: any): void;
    /**
     * Has a value in this set.
     *
     * @param value Value to check.
     * @returns Whether the value is in this set.
     */
    has(value: T): boolean;
    /**
     * New MeekSet containing the values in both sets.
     *
     * @param other Other set.
     * @returns New MeekSet.
     */
    intersection<U extends WeakKey>(other: ReadonlySetLike<U>): MeekSet<T & U>;
    /**
     * Is every value in this set not in other set.
     *
     * @param other Other set.
     * @returns Whether every value in this set is not in other set.
     */
    isDisjointFrom(other: ReadonlySetLike<unknown>): boolean;
    /**
     * Is every value in this set in other set.
     *
     * @param other Other set.
     * @returns Whether every value in this set is in other set.
     */
    isSubsetOf(other: ReadonlySetLike<unknown>): boolean;
    /**
     * Is every value in other set in this set.
     *
     * @param other Other set.
     * @returns Whether every value in other set is in this set.
     */
    isSupersetOf(other: ReadonlySetLike<unknown>): boolean;
    /**
     * Iterator for keys in this set.
     *
     * @returns Key iterator.
     */
    keys(): SetIterator<T>;
    /**
     * The number of values in this set.
     * Can be greater than number of active keys.
     */
    get size(): number;
    /**
     * New MeekSet containing the values in either set but not both.
     *
     * @param other Other set.
     * @returns New MeekSet.
     */
    symmetricDifference<U extends WeakKey>(other: ReadonlySetLike<U>): MeekSet<T | U>;
    /**
     * New MeekSet containing all values from both sets.
     *
     * @param other Other set.
     * @returns New MeekSet.
     */
    union<U extends WeakKey>(other: ReadonlySetLike<U>): MeekSet<T | U>;
    /**
     * Iterator for values in this set.
     *
     * @returns Value iterator.
     */
    values(): SetIterator<T>;
}
/**
 * Readonly MeekSet.
 *
 * @template T Value type.
 */
export type ReadonlyMeekSet<T extends WeakKey> = Omit<MeekSet<T>, 'add' | 'clear' | 'delete'>;
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