/**
 * Copyright (c) 2015-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @flow strict
 */

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.
 */
export function concatAST(asts: $ReadOnlyArray<DocumentNode>): DocumentNode {
  const batchDefinitions = [];
  for (let i = 0; i < asts.length; i++) {
    const definitions = asts[i].definitions;
    for (let j = 0; j < definitions.length; j++) {
      batchDefinitions.push(definitions[j]);
    }
  }
  return {
    kind: 'Document',
    definitions: batchDefinitions,
  };
}