import type { Canvas } from '../../interfaces/canvas';
import { CollabAction, CollabActionSerialized } from './collab-action';
import { CollabTimestamp } from './primitives';
/**
 * A collaboration engine, which manages collaboration for a diagram.
 * @private
 */
export declare class CollabEngine {
    /**
     * Canvas that this collaboration engine belongs to.
     * @private
     */
    readonly canvas: Canvas;
    /**
     * The local replica ID.
     */
    readonly replicaId: string;
    /**
     * Event handler for when we request to send a message to the server.
     */
    onSend?: (message: CollabActionSerialized) => void;
    /**
     * Whether we have joined (or are joining) a room on the server.
     */
    isInRoom: boolean;
    constructor(canvas: Canvas);
    /**
     * Returns a fresh timestamp, suitable for use by new CollabActions.
     */
    freshTimestamp(): CollabTimestamp;
    /**
     * Returns a fresh unique ID, suitable for use by new CollabActions.
     */
    freshId(): string;
    /**
     * Performs the action - immediately locally, and eventually for remote collaborators.
     */
    doCollaboratively(action: CollabAction): void;
    /**
     * Processes a message received from the server.
     *
     * The message is assumed to be non-redundant (in particular, not one of
     * our own messages) and delivered after all prior messages on the server.
     */
    receive(message: CollabActionSerialized): void;
}