import type { RuntimeAdapter } from '../../types';
/**
 * Default runtime adapter using real Node.js APIs.
 * Used when no custom adapter is provided to `run()`.
 */
export declare function createDefaultRuntime(): RuntimeAdapter;
/**
 * Creates a test runtime adapter with instant sleep, deterministic time,
 * and predictable random values. Override any method as needed.
 *
 * @example
 * ```typescript
 * const runtime = createTestRuntime();
 * const result = await run({ definition, runtime }, input);
 * ```
 *
 * @example
 * ```typescript
 * // Control specific behavior
 * const runtime = createTestRuntime({
 *   now: () => '2025-01-01T00:00:00.000Z',
 *   randomUUID: () => 'test-uuid-1234',
 * });
 * ```
 */
export declare function createTestRuntime(overrides?: Partial<RuntimeAdapter>): RuntimeAdapter;
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