declare type ValidationMessage = string;
declare type ValidationSuccess = [];
declare type ValidationErr = [ValidationMessage, ...ValidationMessage[]];
export declare type ValidationInfo = ValidationSuccess | ValidationErr;
export declare type Validator<T = any> = (_: T) => ValidationInfo;
export declare const isValidationSuccess: (info: ValidationInfo) => info is [];
export declare const isValidationErr: (info: ValidationInfo) => info is ValidationErr;
declare type Predicate<T = any> = (_: T) => boolean;
export declare const validator: <T = any>(predicate: Predicate<T>) => (message: string) => Validator<T>;
export {};