/** A regular expression matching illegal consonant forms. */
export declare const ILLEGAL_CONSONANT_FORMS: RegExp;
/**
 * Checks whether a consonant form is phonotactically legal.
 *
 * @param consonantForm The consonant form to check.
 * @returns A boolean indicating whether the consonant form is legal.
 */
export declare function isLegalConsonantForm(consonantForm: string): boolean;