/**
 * Options used to pass to validation decorators.
 */
export interface ValidationOptions {
    /**
     * Specifies if validated value is an array and each of its item must be validated.
     */
    each?: boolean;
    /**
     * Error message used to be used on validation fail.
     * You can use "$value" to use value that was failed by validation.
     * You can use "$constraint1" and "$constraint2" keys in the message string,
     * and they will be replaced with constraint values if they exist.
     * Message can be either string, either a function that returns a string.
     * Second option allows to use values and custom messages depend of them.
     */
    message?: string | ((value?: any, constraint1?: any, constraint2?: any) => string);
    /**
     * Validation groups used for this validation.
     */
    groups?: string[];
    /**
     * Indicates if validation must be performed always, no matter of validation groups used.
     */
    always?: boolean;
}