Revert "Add a new babel transformer for inlining regenerator-runtime per file"

Summary:
This reverts commit e7c1cf5b7d.

Fixes #14838.

Test using the steps in #14838.
Closes https://github.com/facebook/react-native/pull/15584

Reviewed By: jeanlauliac

Differential Revision: D5670640

Pulled By: mjesun

fbshipit-source-id: e7c4c4cfdd0d3142561847aefb35b8a8b33e5ffa

babel-preset/configs/main.js

@@ -32,7 +32,6 @@ const getPreset = (src, options) => {
     'transform-flow-strip-types',
     'transform-react-jsx',
     'transform-regenerator',
-    require('../transforms/transform-regenerator-runtime-insertion'),
     [
       'transform-es2015-modules-commonjs',
       {strict: false, allowTopLevelThis: true},

babel-preset/transforms/transform-regenerator-runtime-insertion.js

@@ -1,109 +0,0 @@
-/**
- * Copyright (c) 2013-present, Facebook, Inc.
- * All rights reserved.
- *
- * This source code is licensed under the BSD-style license found in the
- * LICENSE file in the root directory of this source tree. An additional grant
- * of patent rights can be found in the PATENTS file in the same directory.
- *
- */
-
-'use strict';
-
-const babel = require('babel-core');
-const t = babel.types;
-
-const NAME = 'regenerator-runtime';
-const REGENERATOR_NOT_NEEDED = 'NOT_NEEDED';
-const REGENERATOR_NEEDED = 'NEEDED';
-const REGENERATOR_ALREADY_REQUIRED = 'ALREADY_REQUIRED';
-
-function flagState(state) {
-  if (state !== REGENERATOR_ALREADY_REQUIRED) {
-    state.regeneratorRequired = REGENERATOR_NEEDED;
-  }
-}
-
-function checkRequire(node, state) {
-  const method = node.callee.name;
-  const args = node.arguments;
-
-  if (
-    method === 'require' &&
-    t.isStringLiteral(args[0]) &&
-    args[0].value.startsWith(NAME)
-  ) {
-    state.regeneratorRequired = REGENERATOR_ALREADY_REQUIRED;
-  }
-}
-
-function checkFunction(node, state) {
-  // Method is neither a generator nor an async function; skip.
-  if (!node.generator && !node.async) {
-    return;
-  }
-
-  // This will only set the status to needed if it hasn't already been required.
-  if (state.regeneratorRequired === REGENERATOR_NOT_NEEDED) {
-    state.regeneratorRequired = REGENERATOR_NEEDED;
-  }
-}
-
-const isGeneratorRequired = {
-  CallExpression(path, state) {
-    checkRequire(path.node, state);
-  },
-
-  FunctionDeclaration(path, state) {
-    checkFunction(path.node, state);
-  },
-
-  ClassMethod(path, state) {
-    checkFunction(path.node, state);
-  },
-
-  ArrowFunctionExpression(path, state) {
-    checkFunction(path.node, state);
-  },
-
-  FunctionExpression(path, state) {
-    checkFunction(path.node, state);
-  },
-
-  YieldExpression(path, state) {
-    flagState(state);
-  },
-
-  AwaitExpression(path, state) {
-    flagState(state);
-  },
-};
-
-/**
- * Adds a "const regeneratorRuntime = require('regenerator-runtime') to each
- * file that does not include regenerator-runtime, but requires it because it
- * contains async/await or generators.
- */
-module.exports = function() {
-  return {
-    visitor: {
-      Program(path, state) {
-        state.regeneratorRequired = REGENERATOR_NOT_NEEDED;
-        path.traverse(isGeneratorRequired, state);
-
-        if (state.regeneratorRequired === REGENERATOR_NEEDED) {
-          path.node.body.unshift(
-            t.variableDeclaration('const', [
-              t.variableDeclarator(
-                t.identifier('regeneratorRuntime'),
-                t.callExpression(t.identifier('require'), [
-                  t.stringLiteral(NAME),
-                ])
-              )
-            ])
-          );
-        }
-      },
-    },
-  };
-};

package.json

@@ -73,7 +73,6 @@
     ],
     "unmockedModulePathPatterns": [
       "node_modules/react/",
-      "node_modules/regenerator-runtime/",
       "Libraries/Renderer",
       "promise",
       "source-map",