import { DocumentNode } from "graphql";
import { DiagnosticsResult } from "../utils/DiagnosticError.js";
/**
 * Ensure that all fields on `Subscription` return an AsyncIterable and transform
 * the return type of subscription fields to not treat AsyncIterable as as list type.
 */
export declare function validateAsyncIterable(doc: DocumentNode): DiagnosticsResult<DocumentNode>;