import type { Constructor, VariablesOf } from '@apollo-elements/core/types';
import type { ApolloElementElement, ControllerHost } from '@apollo-elements/core';
type MixinInstance<B extends Constructor<HTMLElement>> = B & {
    new <D = unknown, V = VariablesOf<D>>(): ControllerHost & ApolloElementElement<D, V>;
    documentType: 'document' | 'mutation' | 'query' | 'subscription';
    observedAttributes?: string[];
};
declare function ApolloElementMixinImplementation<B extends Constructor & {
    observedAttributes?: string[];
}>(superclass: B): MixinInstance<B>;
/**
 * `ApolloElementMixin`: class mixin for apollo custom elements.
 */
export declare const ApolloElementMixin: typeof ApolloElementMixinImplementation;
export {};