import type { CustomGraphiQLProps, GraphQLParams } from './interfaces.js';
/**
 * When express-graphql receives a request which does not Accept JSON, but does
 * Accept HTML, it may present GraphiQL, the in-browser GraphQL explorer IDE.
 *
 * When shown, it will be pre-populated with the result of having executed the
 * requested query.
 */
export declare function renderGraphiQL(data: GraphQLParams, props: CustomGraphiQLProps, polyfill?: boolean): string;