import type { DocumentNode } from '@apollo/client';
import type { Constructor, CustomElement } from '@apollo-elements/core/types';
declare function GraphQLScriptChildMixinImplementation<B extends Constructor<CustomElement & {
    document: DocumentNode | null;
    variables: unknown | null;
    error: Error | null;
}>>(superclass: B): B & Constructor<{
    getDOMVariables(): unknown | null;
    getDOMGraphQLDocument(): Promise<DocumentNode | null>;
}>;
/**
 * GraphQLScriptChildMixin implementation class.
 * This declaration allows types and documentation to propagate to subclasses.
 */
export declare class GraphQLScriptChildMixinImpl {
    /**
     * @summary Get a GraphQL DocumentNode from the element's GraphQL script child
     */
    protected getDOMGraphQLDocument(): Promise<DocumentNode | null>;
    /**
     * @summary Gets operation variables from the element's JSON script child
     */
    protected getDOMVariables(): unknown | null;
    /**
     * Initializes a `MutationObserver` which watches for changes the the element's children.
     * When a `<script type="application/graphql">` or `<script type="application/json">`
     * is appended, the mixin asynchrously sets the `document` or `variables`.
     */
    connectedCallback(): Promise<void>;
    /**
     * Disconnects the `MutationObserver`.
     */
    disconnectedCallback(): void;
}
/**
 * `GraphQLScriptChildMixin`
 *  @summary Allows elements to read their GraphQL document and variables from HTML.
 */
export declare const GraphQLScriptChildMixin: typeof GraphQLScriptChildMixinImplementation;
export {};