import { FetchOptions, Gateway } from '../types/Gateway';
import { PageList } from '../types/PageList';
import { Json, JsonValue } from '../types/Json';
import { Id } from '../types/Id';
import { Optional } from '../types/Types';
export declare class InMemoryGateway extends Gateway {
    private readonly data;
    constructor(data: Promise<PageList<Json>>);
    all(options?: FetchOptions): Promise<PageList<Json>>;
    byId(id: Id): Promise<Optional<Json>>;
    by: (key: string, value: JsonValue) => Promise<PageList<Json>>;
    exists(id: Id): Promise<boolean>;
    add(item: Json): Promise<Json>;
    remove(id: Id): Promise<true>;
    update(item: Json): Promise<Json>;
}