/**
 * Key derivation utilities for circuit breaker isolation
 */
import type { CircuitBreakerConfig, ResilienceContext } from './types.js';
/**
 * Derive a circuit breaker key from ResilienceContext
 *
 * Priority order:
 * 1. Explicit key in circuit breaker config
 * 2. Derived from workflowId:stepId
 * 3. Fallback to global:unknown for missing values
 *
 * @param context - The resilience context containing workflow and step IDs
 * @param config - Optional circuit breaker config with explicit key
 * @returns A string key for circuit isolation
 */
export declare function deriveKey(context?: ResilienceContext, config?: CircuitBreakerConfig): string;
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