import type { ChainExecution } from "./types.js";
/** Error thrown to suspend execution at a gate step (frees the worker). */
export declare class GateSuspendError extends Error {
    readonly stepId: string;
    readonly executionId: string;
    constructor(stepId: string, executionId: string);
}
export declare function getPendingApprovals(getExecution: (id: string) => ChainExecution | undefined): Array<{
    executionId: string;
    stepId: string;
    chainName: string;
    prompt: string;
    startedAt: string;
}>;
export declare function approveGate(executionId: string, stepId: string, approved: boolean): boolean;
export declare function waitForApproval(executionId: string, stepId: string, timeoutHours: number, onTimeout: "skip" | "error" | "approve"): Promise<string>;
export declare function getGateResult(key: string): string | undefined;
export declare function deleteGateResult(key: string): void;
export declare function setGateResult(key: string, value: string): void;
export declare function hasGateResult(key: string): boolean;
export declare function setGateTimer(key: string, timer: ReturnType<typeof setTimeout>): void;
/** Remove all gate entries whose key starts with the given executionId. */
export declare function cleanupGates(executionId: string): void;
/** Purge gate entries older than 1 hour. */
export declare function purgeExpiredGates(): void;