import type { WorkflowEvent } from '../core/types.ts';
/** Reason a workflow event tail terminated. */
export type StreamCloseReason = 'workflow-terminal' | 'client-closed' | 'reconnect-exhausted' | 'server-error';
export type WorkflowEventTailLifecycleOptions = {
    readonly bufferForIteration?: boolean;
    readonly onClose: (reason: StreamCloseReason) => void;
};
/**
 * Shared async-iterator lifecycle for client event tails. Transports own
 * connection mechanics; this owns buffering, close state, and wake-up handling.
 */
export declare class WorkflowEventTailLifecycle implements AsyncIterable<WorkflowEvent> {
    #private;
    constructor(options: WorkflowEventTailLifecycleOptions);
    get closed(): boolean;
    get closeReason(): StreamCloseReason | null;
    emit(event: WorkflowEvent, onEvent: (event: WorkflowEvent) => void): boolean;
    terminate(reason: StreamCloseReason): void;
    close(): void;
    [Symbol.asyncIterator](): AsyncIterator<WorkflowEvent>;
}