import type { WorkflowActivityObserver, WorkflowActivityPublisher, WorkflowActivitySnapshotFrame, WorkflowActivitySubscription, WorkflowEvent, WorkflowObservationDiagnostic } from "./workflow-events.js";
export declare class WorkflowActivityHub {
    private readonly runDelivery;
    constructor(runDelivery?: (operation: () => Promise<void>) => Promise<void>);
    private cursor;
    private availability;
    private roots;
    private observers;
    private failures;
    private disposed;
    private dispatch?;
    private pendingDispatches;
    bindDispatcher(dispatch: (event: WorkflowEvent, isCurrent: () => boolean) => Promise<void>): void;
    private emit;
    getSnapshotFrame(): WorkflowActivitySnapshotFrame;
    observeWorkflowActivity(observer: WorkflowActivityObserver): WorkflowActivitySubscription;
    private disposeLease;
    private enqueue;
    private deliver;
    private broadcast;
    private advance;
    registerWorkflowActivityPublisher(): WorkflowActivityPublisher;
    dispose(): void;
    diagnostics(): readonly WorkflowObservationDiagnostic[];
    private record;
}
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