import type { UnstampedMessageStreamEvent } from "#protocol/message.js";
import type { InputRequest } from "#shared/input.js";
/**
 * Channel state for showing a session's open requests one at a time. A typed
 * reply answers the first open request, so a channel that can only show text
 * shows that one and holds the rest until it is answered.
 */
export interface PromptQueueState {
    /** The request the channel last showed, which a typed reply answers. */
    shownPromptId?: string;
}
/**
 * Event handlers that call `show` with the request a typed reply answers now,
 * each time that request changes. They read which requests are open from the
 * session's own record of the events it published, so a request that closed
 * never shows, and one the channel failed to show is tried again on the next
 * event. `show` returns `false` when it could not show the request.
 */
export declare function promptQueueEvents<TChannel extends {
    state: PromptQueueState;
}>(show: (channel: TChannel, request: InputRequest) => Promise<boolean | void>): {
    "input.requested"(data: Extract<UnstampedMessageStreamEvent, {
        type: "input.requested";
    }>["data"], channel: TChannel): Promise<void>;
    "input.resolved"(data: Extract<UnstampedMessageStreamEvent, {
        type: "input.resolved";
    }>["data"], channel: TChannel): Promise<void>;
    "approval.settled"(data: Extract<UnstampedMessageStreamEvent, {
        type: "approval.settled";
    }>["data"], channel: TChannel): Promise<void>;
};