import { type AppEvent, type AppEventPayloads, type AppEventType, type MessageId, type SessionId, type TurnId } from "./app-event.js";
/** Injectable time source so replay tests are deterministic. */
export interface Clock {
    now(): number;
}
export declare const systemClock: Clock;
export interface IdFactory {
    event(): string;
    message(): MessageId;
}
export declare function createCountingIdFactory(prefix?: string): IdFactory;
export declare function createRandomIdFactory(): IdFactory;
export declare class EventSequencer {
    readonly ids: IdFactory;
    private readonly clock;
    private seq;
    private sessionId;
    constructor(sessionId: SessionId, ids?: IdFactory, clock?: Clock);
    get current(): number;
    /** Start a fresh sequence (e.g. after /new remints the session id). */
    rebind(sessionId: SessionId): void;
    build<K extends AppEventType>(type: K, payload: AppEventPayloads[K], turnId?: TurnId | undefined): AppEvent<K, AppEventPayloads[K]>;
}