Move the getBabelRegisterConfig function to the one file that uses it

Reviewed By: rubennorte

Differential Revision: D7788532

fbshipit-source-id: 1d08d159574247366492c036f5c530c982ec67b3

packages/metro/src/babel-bridge.js

@@ -47,8 +47,6 @@ function resolvePlugins7(plugins: Array<any>) {
 }
 
 module.exports = {
-  getBabelRegisterConfig: getBabelRegisterConfig7,
-
   externalHelpersPlugin: externalHelpersPlugin7,
   inlineRequiresPlugin: inlineRequiresPlugin7,
   makeHMRConfig: makeHMRConfig7,
@@ -112,51 +110,3 @@ function getPreset(name: string) {
   //$FlowFixMe: TODO t26372934 this has to be dynamic
   return require(name);
 }
-
-function getBabelRegisterConfig7() {
-  // from: metro/packages/metro-babel-register/babel-register.js
-  // (dont use babel-register anymore, it obsoleted with babel 7)
-
-  /**
-   * 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.
-   *
-   * @format
-   */
-  'use strict';
-
-  require('metro-babel-register/src/node-polyfills');
-
-  var _only = [];
-
-  const PLUGINS = [
-    'transform-flow-strip-types',
-    'proposal-object-rest-spread',
-    'proposal-class-properties',
-  ];
-
-  function config(onlyList: Array<string>) {
-    /* $FlowFixMe(>=0.70.0 site=react_native_fb) This comment suppresses an
-     * error found when Flow v0.70 was deployed. To see the error delete this
-     * comment and run Flow. */
-    _only = _only.concat(onlyList);
-    return {
-      presets: [],
-      /* $FlowFixMe(>=0.70.0 site=react_native_fb) This comment suppresses an
-       * error found when Flow v0.70 was deployed. To see the error delete
-       * this comment and run Flow. */
-      plugins: PLUGINS.map(pluginName =>
-        // $FlowFixMe TODO t26372934 plugin require
-        require(`@babel/plugin-${pluginName}`),
-      ),
-      only: _only,
-      retainLines: true,
-      sourceMaps: 'inline',
-      babelrc: false,
-    };
-  }
-
-  return config;
-}

packages/metro/src/lib/polyfills/__tests__/require-test.js

@@ -14,11 +14,58 @@
 
 const fs = require('fs');
 
-const {getBabelRegisterConfig} = require('../../../babel-bridge');
 const {transformSync} = require('@babel/core');
 
 const babelConfig = getBabelRegisterConfig();
 
+function getBabelRegisterConfig() {
+  // from: metro/packages/metro-babel-register/babel-register.js
+  // (dont use babel-register anymore, it obsoleted with babel 7)
+
+  /**
+   * 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.
+   *
+   * @format
+   */
+  'use strict';
+
+  require('metro-babel-register/src/node-polyfills');
+
+  var _only = [];
+
+  const PLUGINS = [
+    'transform-flow-strip-types',
+    'proposal-object-rest-spread',
+    'proposal-class-properties',
+  ];
+
+  function config(onlyList: Array<string>) {
+    /* $FlowFixMe(>=0.70.0 site=react_native_fb) This comment suppresses an
+     * error found when Flow v0.70 was deployed. To see the error delete this
+     * comment and run Flow. */
+    _only = _only.concat(onlyList);
+    return {
+      presets: [],
+      /* $FlowFixMe(>=0.70.0 site=react_native_fb) This comment suppresses an
+       * error found when Flow v0.70 was deployed. To see the error delete
+       * this comment and run Flow. */
+      plugins: PLUGINS.map(pluginName =>
+        // $FlowFixMe TODO t26372934 plugin require
+        require(`@babel/plugin-${pluginName}`),
+      ),
+      only: _only,
+      retainLines: true,
+      sourceMaps: 'inline',
+      babelrc: false,
+    };
+  }
+
+  return config;
+}
+
 describe('require', () => {
   const moduleSystemCode = (() => {
     const {only, ...config} = babelConfig([]);