declare global {
    interface Map<K, V> {
        toReadonly(): ReadonlyMap<K, V>;
    }
}
export declare class RuntimeReadonlyMap<K, V> implements ReadonlyMap<K, V> {
    private readonly _wrap;
    constructor(_wrap: Map<K, V>);
    forEach(callbackfn: (value: V, key: K, map: ReadonlyMap<K, V>) => void, thisArg?: any): void;
    get(key: K): V | undefined;
    has(key: K): boolean;
    get size(): number;
    entries(): MapIterator<[K, V]>;
    keys(): MapIterator<K>;
    values(): MapIterator<V>;
    [Symbol.iterator](): MapIterator<[K, V]>;
}