/**
 * Format a phone number in the standard E.164 format. This is recommended for storing
 * phone numbers in a database.
 * @param phoneNumber the phone number to test; formatting does not matter
 * @returns a string in the standard E.164 format
 * @throws InvalidPhoneNumberError if the phone number is not valid
 */
export declare function formatStandard(phoneNumber: string): string;
/**
 * Format a phone number in the most common display format.
 * @param phoneNumber the phone number to test; formatting does not matter
 * @returns a string in the standard North American display format
 * @throws InvalidPhoneNumberError if the phone number is not valid
 */
export declare function formatFriendly(phoneNumber: string): string;
/**
 * Format a phone number in a common display format that is compact but still readable.
 * @param phoneNumber the phone number to test; formatting does not matter
 * @returns a string in the compact display format
 * @throws InvalidPhoneNumberError if the phone number is not valid
 */
export declare function formatCompact(phoneNumber: string): string;
export declare const standard: typeof formatStandard;
export declare const friendly: typeof formatFriendly;
export declare const compact: typeof formatCompact;