/**
 * Creates a Metro serializer configuration with Hardened JavaScript.
 *
 * @param {LockdownSerializerOptions} [options={}] - Configuration options.
 *   Default is `{}`
 * @param {LockdownSerializerConfig} [userConfig={}] - User-provided serializer
 *   configuration. Default is `{}`
 * @returns {LockedDownSerializerConfig} Serializer configuration with Hardened
 *   JavaScript.
 */
export function lockdownSerializer({ hermesRuntime }?: LockdownSerializerOptions, userConfig?: LockdownSerializerConfig): LockedDownSerializerConfig;
/**
 * Asserts the alleged polyfills are valid for serialization by Metro.
 *
 * @param {unknown} polyfills - Array of polyfill paths
 * @returns {asserts polyfills is ReadonlyArray<string>}
 * @throws {TypeError} If required polyfills are invalid
 */
export function assertPolyfills(polyfills: unknown): asserts polyfills is ReadonlyArray<string>;
import type { LockdownSerializerOptions } from './lockdown-serializer.js';
import type { LockdownSerializerConfig } from './lockdown-serializer.js';
import type { LockedDownSerializerConfig } from './lockdown-serializer.js';
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