import { MessageFunctionType, Result } from '../types';
export interface IsFullWidthErrors {
    TARGET_ARGUMENT_NOT_A_STRING: MessageFunctionType;
}
export declare const IS_FULL_WIDTH_ERRORS: IsFullWidthErrors;
export declare const fullWidth: RegExp;
/**
 * Tests whether the `target` is full width
 *
 * ### Example
 * ```
 * expect(isFullWidth('３ー０　ａ＠ｃｏｍ').value).toBeTruthy()
 * ```
 *
 * @param target The target string
 */
export declare function isFullWidth(target: string): Result<boolean | undefined>;