import { MessageFunctionType, Result } from '../types';
export interface IsEMailErrors {
    TARGET_ARGUMENT_NOT_A_STRING: MessageFunctionType;
}
export declare const IS_EMAIL_ERRORS: IsEMailErrors;
/**
 * IsEmail Options.
 */
export interface IsEmailOptions {
    require_display_name?: boolean;
    allow_display_name?: boolean;
    allow_utf8_local_part?: boolean;
    require_tld?: boolean;
    blacklisted_chars: string;
    ignore_max_length: boolean;
    host_blacklist: any[];
    domain_specific_validation: boolean;
    allow_ip_domain: boolean;
}
/**
 * Tests whether the `target` string is a valid email address
 *
 * ### Example
 * ```
 * expect(isEmail('foo@bar.com').value).toBeTruthy()
 * ```
 *
 * @param target The target
 * @param options The options
 */
export declare function isEmail(target: string, options?: IsEmailOptions): Result<boolean | undefined>;