import type { ApolloClient } from '@apollo/client';
import type { ApolloElementElement, Constructor } from '@apollo-elements/core/types';
import type * as C from '@apollo-elements/core';
type ControllerElementConstructor = Constructor<ApolloElementElement<any, any> & {
    shouldSubscribe?(options?: Partial<ApolloClient.SubscribeOptions>): boolean;
    controller: C.ApolloQueryController<any, any> | C.ApolloSubscriptionController<any, any>;
}>;
/**
 * Mixin which prevents query or subscription operations from fetching until their required variables are set.
 * @param superclass An element which implements either `ApolloQueryInterface` or `ApolloSubscriptionInterface`.
 */
declare function ValidateVariablesMixinImpl<B extends ControllerElementConstructor>(superclass: B): B;
export declare const ValidateVariablesMixin: typeof ValidateVariablesMixinImpl;
export {};