/** Small namespaced extension/runtime documents. Domain histories use dedicated tables. */
export declare class DurableState<T> {
    readonly namespace: string;
    readonly scope: string;
    constructor(namespace: string, scope?: string);
    get(key: string): T | undefined;
    set(key: string, value: T): void;
    delete(key: string): boolean;
    entries(): Array<[string, T]>;
    [Symbol.iterator](): Iterator<[string, T]>;
    values(limit?: number, newestFirst?: boolean): T[];
    update<R>(key: string, operation: (value: T | undefined) => {
        value: T | undefined;
        result: R;
    }): R;
}