/**
 * It register the pattern extension to the Faker instance.
 *
 * @param fake Faker instance
 *
 * @example
 * ```ts
 * import fake from '@micra/faker';
 * import {pattern} from '@micra/faker/extensions/pattern';
 *
 * fake.extend({pattern});
 * ```
 */
export declare function pattern(fake: Faker.Instance): (pattern?: string) => string;