import { Json, JsonValue } from './Json';
import { Id } from './Id';
import { PageList, PageOptions } from './PageList';
import { List } from './List';
import { Optional } from './Types';
export type FetchOptions = PageOptions;
export declare abstract class Gateway<Options = FetchOptions> {
    all(options?: Options): Promise<PageList<Json>>;
    byId(id: Id, options?: Options): Promise<Optional<Json>>;
    by(_key: string, _value: JsonValue, _options?: Options): Promise<PageList<Json>>;
    byIds(..._ids: Id[]): Promise<List<Json>>;
    search(q: JsonValue, options?: Options): Promise<PageList<Json>>;
    filter(options?: Options): Promise<PageList<Json>>;
    exists(id: Id, options?: Options): Promise<boolean>;
    add(item: Json, options?: Options): Promise<Json>;
    update(item: Json, options?: Options): Promise<Json>;
    remove(id: Id, options?: Options): Promise<boolean>;
}