1. /**

  2.  * Copyright (c) Meta Platforms, Inc. and affiliates.

  3.  *

  4.  * This source code is licensed under the MIT license found in the

  5.  * LICENSE file in the root directory of this source tree.

  6.  */

  7. 

  8. 'use strict';

  9. 

  10. const helperModuleImports = require('@babel/helper-module-imports');

  11. 

  12. module.exports = function autoImporter(babel) {

  13.   function getAssignIdent(path, file, state) {

  14.     if (state.id) {

  15.       return state.id;

  16.     }

  17.     state.id = helperModuleImports.addDefault(path, 'shared/assign', {

  18.       nameHint: 'assign',

  19.     });

  20.     return state.id;

  21.   }

  22. 

  23.   return {

  24.     pre: function () {

  25.       // map from module to generated identifier

  26.       this.id = null;

  27.     },

  28. 

  29.     visitor: {

  30.       CallExpression: function (path, file) {

  31.         if (/shared(\/|\\)assign/.test(file.filename)) {

  32.           // Don't replace Object.assign if we're transforming shared/assign

  33.           return;

  34.         }

  35.         if (path.get('callee').matchesPattern('Object.assign')) {

  36.           // generate identifier and require if it hasn't been already

  37.           const id = getAssignIdent(path, file, this);

  38.           path.node.callee = id;

  39.         }

  40.       },

  41. 

  42.       MemberExpression: function (path, file) {

  43.         if (/shared(\/|\\)assign/.test(file.filename)) {

  44.           // Don't replace Object.assign if we're transforming shared/assign

  45.           return;

  46.         }

  47.         if (path.matchesPattern('Object.assign')) {

  48.           const id = getAssignIdent(path, file, this);

  49.           path.replaceWith(id);

  50.         }

  51.       },

  52.     },

  53.   };

  54. };
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