import { MessageFunctionType, Result } from '../types';
export interface IsNumericErrors {
    TARGET_ARGUMENT_NOT_A_STRING: MessageFunctionType;
}
export declare const IS_NUMERIC_ERRORS: IsNumericErrors;
/**
 * Checks whether the `target` string contains only numbers
 *
 * ### Example
 * ```
 * expect(isNumeric('123').value).toBeTruthy()
 * ```
 * @param target The target
 * @param options The options
 */
export declare function isNumeric(target: string, options?: any): Result<boolean | undefined>;