/**
 * Test isolation utilities for cross-runtime execution.
 *
 * Provides default cleanup hooks to reduce cross-test leakage,
 * especially in Bun where module caching and shared globals
 * can cause flakiness.
 *
 * @module
 */
type CleanupTask = () => void | Promise<void>;
/** Registers test cleanup. */
export declare function registerTestCleanup(task: CleanupTask): void;
/**
 * Comprehensive reset of ALL test state across the application.
 *
 * This function clears all known caches and singletons that can cause
 * test isolation issues when running tests in parallel. It should be
 * called at the start and end of each test to ensure clean state.
 *
 * Includes:
 * - Config state (_environmentConfig, runtimeConfig, configCache)
 * - Layout discovery cache
 * - SSR module caches
 * - React cache and compat hooks
 * - Snippet cache
 * - API handler state
 * - Reload notifier
 */
export declare function resetAllTestState(): Promise<void>;
export {};
//# sourceMappingURL=isolation.d.ts.map