export type QueuedInputLane = "steer" | "followUp";
export interface QueuedInputAdmission {
    /**
     * Resolves once every earlier admission in the same lane has queued, been handled, or failed,
     * or once the session lifetime ends, so closing or reloading the session never waits on a hook
     * that is itself waiting on that close. Returns undefined when nothing is pending, so an
     * uncontended submission queues without yielding.
     */
    waitForTurn(): Promise<void> | undefined;
    release(): void;
}
export declare const UNORDERED_ADMISSION: QueuedInputAdmission;
/**
 * Reserve a place in a session's steer or follow-up lane at submission time, so asynchronous
 * input hooks cannot reorder same-lane messages. Input submitted from inside an input hook
 * is not ordered: the hook may await it, and it would otherwise wait for the hook's own message.
 */
export declare function reserveQueuedInputAdmission(session: object, lane: QueuedInputLane, lifetime: AbortSignal): QueuedInputAdmission;
export declare function runInputHook<T>(hook: () => Promise<T>): Promise<T>;
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