/**
 * Checks if a string contains non-English (non-ASCII) characters.
 *
 * This function determines whether a string contains any characters outside
 * the ASCII range (0x00-0x7F).
 *
 * @param str - The string to check for non-English characters
 * @returns True if the string contains any non-English characters after
 *          removing special characters and whitespace, false otherwise.
 *          Also returns false if the input is empty, null, or becomes empty
 *          after removing special characters.
 */
export declare const containsNonEnglishCharacters: (str: string) => boolean;