export interface Validator {
    validator: ValidatorFunction;
    options?: ValidatorOptions;
}
export declare type ValidatorFunction<T = any> = (value: T) => void | boolean | Error;
export declare type ValidatorFunctionS = (value: string) => void | boolean | Error;
export interface ValidatorOptions {
    /**
     * Validate the value as string.
     * If true, the value will be coerced to string and then be validated.
     */
    asString?: boolean;
}