import { ExecutionResult, GraphQLError, GraphQLFormattedError } from "graphql";
import { CompileQuery } from "./types";
export declare function isAsyncIterator<T = unknown>(val: unknown): val is AsyncIterableIterator<T>;
/**
 * Create a compileQuery function using graphql-js
 * @returns CompileQuery
 */
export declare function makeCompileQuery(): CompileQuery;
export declare function isExecutionResult(val: unknown): val is ExecutionResult;
/**
 * Validate whether an operation does not exist
 * or operationName is missing. Even though
 * execution will realize this, we need to provide
 * this hint mainly for handlers to avoid execution
 * @param operation
 * @param operationName
 */
export declare function validateOperationName(operation: string | undefined, operationName: string | null | undefined): GraphQLError[];
/**
 * Given a GraphQLError, format it according to the rules described by the
 * Response Format, Errors section of the GraphQL Specification.
 */
export declare function formatError(error: GraphQLError): GraphQLFormattedError;