/**
 * Map that stringifies the key objects in order to leverage
 * the javascript native Map and preserve key uniqueness.
 */
export declare abstract class StringifyingMap<K, V> {
    private map;
    private keyMap;
    has(key: K): boolean;
    get(key: K): V | undefined;
    set(key: K, value: V): StringifyingMap<K, V>;
    /**
     * Puts new key/value if key is absent.
     * @param key key
     * @param defaultValue default value factory
     */
    putIfAbsent(key: K, defaultValue: () => V): boolean;
    keys(): IterableIterator<K>;
    keyList(): K[];
    values(): IterableIterator<V>;
    valueList(): V[];
    delete(key: K): boolean;
    clear(): void;
    size(): number;
    get length(): number;
    forEach(callbackfn: (value: V, key: string, map: Map<string, V>) => void, thisArg?: unknown): void;
    /**
     * Turns the `key` object to a primitive `string` for the underlying `Map`
     * @param key key to be stringified
     */
    protected abstract stringifyKey(key: K): string;
}