/** @category AST Utilities */
import type { DocumentNode } from '../language/ast';
/**
 * Provided a collection of ASTs, presumably each from different files,
 * concatenate the ASTs together into batched AST, useful for validating many
 * GraphQL source files which together represent one conceptual application.
 * @param documents - Document ASTs to concatenate.
 * @returns A document AST containing all definitions from the provided documents.
 * @example
 * ```ts
 * import { parse } from 'graphql/language';
 * import { concatAST } from 'graphql/utilities';
 *
 * const document = concatAST([parse('type Query { a: String }'), parse('type User { id: ID }')]);
 *
 * document.definitions.length; // => 2
 * ```
 */
export declare function concatAST(
  documents: ReadonlyArray<DocumentNode>,
): DocumentNode;