import { MessageFunctionType, Result } from '../types';
export interface IsVariableWidthErrors {
    TARGET_ARGUMENT_NOT_A_STRING: MessageFunctionType;
}
export declare const IS_VARIABLE_WIDTH_ERRORS: IsVariableWidthErrors;
/**
 * Test whether the string contains
 * a mixture of full and half-width chars.
 *
 * ### Example
 * ```
 * expect(('Ｆｶﾀｶﾅﾞﾬ').value).toBeTruthy()
 * ```
 *
 * @param target The target string
 */
export declare function isVariableWidth(target: string): Result<boolean | undefined>;