/**
 * Pause Signal Detector
 *
 * Detects pause signals from pipeline step execution results.
 * Supports both tool-based signals (PauseSignal with __pause: true)
 * and return-value signals (PauseRequest with pause: true).
 */
import { type PauseSignal, type PauseMetadata } from './types';
/**
 * Result of pause detection.
 */
export interface DetectedPause {
    /** The normalized pause signal */
    signal: PauseSignal;
    /** Pause metadata for checkpoint storage */
    metadata: PauseMetadata;
    /** TTL override if specified */
    ttlMs?: number;
}
/**
 * Detect pause signal from step execution result.
 *
 * Checks for both tool-based PauseSignal (with __pause: true marker)
 * and return-value PauseRequest (with pause: true marker).
 *
 * For agent steps, the result may contain tool call results.
 * We need to check if any tool result is a pause signal.
 *
 * @param result - Step execution result (could be any shape)
 * @returns DetectedPause if pause signal found, null otherwise
 *
 * @example
 * // Tool-based pause (from request_human_input tool)
 * const result = { __pause: true, prompt: 'Approve?' };
 * detectPauseSignal(result); // => { signal: {...}, metadata: {...} }
 *
 * // Return-value pause (from function step)
 * const result = { pause: true, prompt: 'Select option' };
 * detectPauseSignal(result); // => { signal: {...}, metadata: {...} }
 *
 * // Normal result (no pause)
 * const result = { data: 'processed' };
 * detectPauseSignal(result); // => null
 */
export declare function detectPauseSignal(result: unknown): DetectedPause | null;
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