import { type DeliveryQueue, type QueueEditSession, type QueuedCommand, type QueuedMessage, type QueueLane } from "./queue-state.ts";
export type QueueModes = Record<QueueLane, "all" | "one-at-a-time">;
/** Attachments always keep a row in message form. */
export declare function itemCommand<T>(item: Pick<QueuedMessage<T>, "text" | "images">): QueuedCommand | undefined;
/** Only the contiguous same-lane head is dispatchable. */
export declare function headDeliveryBatch<T>(timeline: readonly QueuedMessage<T>[]): QueuedMessage<T>[];
export declare function laneIsHeld<T>(queue: DeliveryQueue<T>, edit: QueueEditSession<T> | undefined, modes: QueueModes, lane: QueueLane): boolean;
export declare function takeMessageBatch<T>(queue: DeliveryQueue<T>, edit: QueueEditSession<T> | undefined, modes: QueueModes, lane: QueueLane): QueuedMessage<T>[];
export declare function shouldHoldFailedRun(paused: boolean, hasRows: boolean): boolean;
export declare function canRecoverCompaction(errorHold: boolean, overflow: boolean, failed: boolean): boolean;
/** Recovery never releases an explicit user pause. Shared by TUI and headless. */
export declare class QueueRunHold {
    paused: boolean;
    errorHold: boolean;
    pause(): void;
    resume(): void;
    failed(hasRows: boolean): void;
    recovered(): void;
    compacted(overflow: boolean, failed: boolean): void;
}