import { Schema, Document } from "mongoose";
import HookErrorCallback from "../interfaces/HookErrorCallback";
export declare type RequiredIfDefinitionType<T extends Document = any> = {
    message?: string;
    validator: (instance: T) => Promise<boolean> | boolean;
};
export declare type RequiredIfFuncOptions<T extends Document = any> = {
    /**
     * Error callback
     */
    errorCb?: HookErrorCallback;
};
/**
 * Project model from mass assignment
 * @param schema mongoose schem
 * @param options options
 */
export default function RequiredIf<T extends Document = any>(schema: Schema<any>, options: RequiredIfFuncOptions<T>): Promise<void>;