import type { MeldClone, MeldReadState, MeldState, MeldUpdate, Write } from '@m-ld/m-ld';
import type { BackendLevel } from '../lib/index.js';
import { Subdomain, SubdomainSpec } from '../data/Subdomain.js';
type JsonMeldUpdate = Omit<MeldUpdate, 'trace'>;
export interface SubdomainUpdate extends JsonMeldUpdate {
    /**
     * The number of times this update has been emitted. A number greater than one
     * indicates a timeout or restart has lead to uncertainty whether the update
     * was processed.
     */
    '@emitCount': number;
}
export declare function tickKey(tick: number): string;
/**
 * Mediates access to the given clone.
 *
 * Updates may be emitted by the `update` event, {@link #poll} and {@link #write},
 * which emit disjoint sets of updates under normal operation.
 */
export declare class SubdomainClone extends Subdomain {
    private readonly _clone;
    private readonly queueStore;
    private _state;
    private events;
    private _closing;
    constructor(spec: SubdomainSpec, _clone: MeldClone, backend: BackendLevel);
    on(eventName: 'echo', listener: (sdu: SubdomainUpdate) => void): this;
    on(eventName: 'update', listener: (sdu: SubdomainUpdate) => void): this;
    on(eventName: 'lockRelease', listener: () => void): this;
    once(eventName: string, listener: (...args: any[]) => void): this;
    /** Getter omits state, which is managed by this class */
    get clone(): Omit<MeldClone, keyof MeldState>;
    get state(): MeldReadState;
    private enqueue;
    private doAndStayLocked;
    get tick(): number;
    /**
     * Report the update queue, incrementing the dequeue count.
     * LOCKS the state until a `lockRelease` event.
     */
    poll(): AsyncGenerator<SubdomainUpdate>;
    /**
     * LOCKS the state until a `lockRelease` event.
     */
    write(request?: Write): Promise<SubdomainUpdate | null>;
    get locked(): boolean;
    unlock(): Promise<void>;
    close(): Promise<void>;
}
export {};