import { It } from "./Iterable";
/**
 * Base-type for helper collections
 * T is the object-type the helper wraps
 * TWrapper is the helper-type which wraps the objects of type T
 */
export declare abstract class Collection<T extends object, TWrapper, TId> extends It<TWrapper> {
    private readonly _cache;
    private readonly _wrapper;
    constructor(_cache: WeakMap<T, TWrapper>, _wrapper: (item: T) => TWrapper);
    abstract has(id: TId): boolean;
    protected _getWrapper(item: T): TWrapper;
}