/**
 * A map variant that maps keys to values and, in contrast to regular maps, also
 * vice versa. Mostly this is an abstraction over two individual maps with all
 * the bookkeeping taken care of. The API should be fairly self-explanatory - it
 * is essentially equal to that of a regular map, just with every operation
 * duplicated to support both key- and value-oriented approaches. Use this
 * module by importing from `@sirpepe/shed/BiMap`.
 */
export declare class BiMap<K, V> {
    private byKey;
    private byVal;
    constructor(values?: Iterable<[K, V]>);
    set(key: K, val: V): void;
    hasKey(key: K): boolean;
    hasVal(val: V): boolean;
    getByKey(key: K): V | undefined;
    getByVal(val: V): K | undefined;
    deleteByKey(key: K): void;
    deleteByVal(val: V): void;
    clear(): void;
    keys(): Iterable<K>;
    values(): Iterable<V>;
    entries(): Iterable<[K, V]>;
    get size(): number;
    get [Symbol.iterator](): () => IterableIterator<[K, V]>;
}