transform-object-assign-require for Babel 7

diff.diff

diff --git a/scripts/babel/transform-object-assign-require.js b/scripts/babel/transform-object-assign-require.js
index 2d4d8203b..d98591c16 100644
--- a/scripts/babel/transform-object-assign-require.js
+++ b/scripts/babel/transform-object-assign-require.js
@@ -7,12 +7,16 @@
 
 'use strict';
 
+const {addDefault} = require('@babel/helper-module-imports');
+
 module.exports = function autoImporter(babel) {
   function getAssignIdent(path, file, state) {
     if (state.id) {
-      return state.id;
+      // Based on similar code in @babel/plugin-transform-runtime
+      // https://github.com/babel/babel/blob/a479540/packages/babel-plugin-transform-runtime/src/index.js#L69
+      return babel.types.cloneNode(state.id);
     }
-    state.id = file.addImport('object-assign', 'default', 'assign');
+    state.id = addDefault(path, 'object-assign', {nameHint: 'assign'});
     return state.id;
   }
 

transform-object-assign-require.js

/**
 * Copyright (c) 2013-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.
 */

'use strict';

const {addDefault} = require('@babel/helper-module-imports');

module.exports = function autoImporter(babel) {
  function getAssignIdent(path, file, state) {
    if (state.id) {
      // Based on similar code in @babel/plugin-transform-runtime
      // https://github.com/babel/babel/blob/a479540/packages/babel-plugin-transform-runtime/src/index.js#L69
      return babel.types.cloneNode(state.id);
    }
    state.id = addDefault(path, 'object-assign', {nameHint: 'assign'});
    return state.id;
  }

  return {
    pre: function() {
      // map from module to generated identifier
      this.id = null;
    },

    visitor: {
      CallExpression: function(path, file) {
        if (path.get('callee').matchesPattern('Object.assign')) {
          // generate identifier and require if it hasn't been already
          const id = getAssignIdent(path, file, this);
          path.node.callee = id;
        }
      },

      MemberExpression: function(path, file) {
        if (path.matchesPattern('Object.assign')) {
          const id = getAssignIdent(path, file, this);
          path.replaceWith(id);
        }
      },
    },
  };
};