/**
 * @file Utilities - extRegex
 * @module ext-regex/utils/extRegex
 */
import type { Options } from '../interfaces/index.mjs';
/**
 * Creates a regular expression matching the given file extension, `ext`.
 *
 * If the given file extension does not begin with a dot character (`'.'`), it
 * will be formatted before being converted to a regular expression pattern. The
 * resulting regular expression will match the formatted file extension instead.
 *
 * Throws `ERR_INVALID_ARG_TYPE` if the given file extension is not a string.
 *
 * @see {@linkcode errnode.ERR_INVALID_ARG_TYPE}
 *
 * @param {string} ext - File extension to evaluate
 * @param {Options?} [options] - Regular expression options
 * @return {RegExp} Regular expression matching `ext`
 * @throws {errnode.NodeError<TypeError>} If `ext` is not a string
 */
declare const extRegex: (ext: string, options?: Options) => RegExp;
export default extRegex;