/**
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @format
 * @flow strict-local
 */

'use strict';

const traverse = require('@babel/traverse').default;
const nullthrows = require('nullthrows');

/**
 * Select unused names for "metroImportDefault" and "metroImportAll", by
 * calling "generateUid".
 */
function generateImportNames(ast: BabelNode): {
  importAll: string,
  importDefault: string,
} {
  let importDefault;
  let importAll;

  traverse(ast, {
    Program(path) {
      importAll = path.scope.generateUid('$$_IMPORT_ALL');
      importDefault = path.scope.generateUid('$$_IMPORT_DEFAULT');

      path.stop();
    },
  });

  return {
    importAll: nullthrows(importAll),
    importDefault: nullthrows(importDefault),
  };
}

module.exports = generateImportNames;