/**
 * Approval Poller
 *
 * SDK-internal handler for await_approval steps.
 * Automatically polls for approval status until completion, error, or timeout.
 *
 * Features:
 * - Respects pollInterval from the server
 * - Stops polling when expiresAt is reached
 * - Supports cancellation via AbortController
 */
import type { AwaitApprovalStep, WireResponse } from "../protocol";
export interface PollerConfig {
    /** Function to send a poll action and get response */
    sendPoll: (signal?: AbortSignal) => Promise<WireResponse>;
    /** Called when polling completes (success or error) */
    onComplete: (response: WireResponse) => void;
    /** Called on polling errors */
    onError: (error: Error) => void;
    /** AbortSignal for cancellation */
    signal?: AbortSignal;
}
export interface ApprovalPollerResult {
    /** Whether polling completed successfully */
    completed: boolean;
    /** Final response (if completed) */
    response?: WireResponse;
    /** Error (if failed) */
    error?: Error;
    /** Reason for stopping */
    reason: "completed" | "expired" | "cancelled" | "error";
}
/**
 * Poll for approval status until completion, expiration, or cancellation.
 *
 * @param step - The await_approval step from the server
 * @param config - Polling configuration
 * @returns Result of the polling operation
 */
export declare function pollForApproval(step: AwaitApprovalStep, config: PollerConfig): Promise<ApprovalPollerResult>;
/**
 * Create an AbortController-based poller that can be cancelled.
 */
export declare function createApprovalPoller(step: AwaitApprovalStep, sendPoll: (signal?: AbortSignal) => Promise<WireResponse>): {
    start: () => Promise<ApprovalPollerResult>;
    cancel: () => void;
};