Revert D6210177: react-native: BundleSegments

Differential Revision: D6210177

fbshipit-source-id: 8cb4ee37cd03698e9f3980a9819269086a9d6eab

Libraries/Utilities/BundleSegments.js

@@ -1,54 +0,0 @@
-/**
- * Copyright (c) 2015-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.
- *
- * @flow
- * @format
- * @providesModule BundleSegments
- */
-
-'use strict';
-
-let segmentLoaders = new Map();
-
-/**
- * Ensure that a bundle segment is ready for use, for example requiring some of
- * its module. We cache load promises so as to avoid calling `fetchBundle` twice
- * for the same bundle. We assume that once a segment is fetched/loaded, it is
- * never gettting removed during this instance of the JavaScript VM.
- */
-async function loadForModule(moduleID: number): Promise<void> {
-  const {segmentId} = (require: $FlowFixMe).unpackModuleId(moduleID);
-  if (segmentId === 0) {
-    return;
-  }
-  let segmentLoader = segmentLoaders.get(segmentId);
-  if (segmentLoader != null) {
-    return await segmentLoader;
-  }
-  // FIXME: `fetchBundle` should be renamed `fetchSegment`.
-  const {fetchBundle} = global;
-  if (fetchBundle == null) {
-    throw new Error(
-      'When bundle splitting is enabled, the `global.fetchBundle` function ' +
-        'must be provided to be able to load particular bundle segments.',
-    );
-  }
-  segmentLoader = new Promise((resolve, reject) => {
-    fetchBundle(segmentId, error => {
-      if (error != null) {
-        reject(error);
-        return;
-      }
-      resolve();
-    });
-  });
-  segmentLoaders.set(segmentId, segmentLoader);
-  return await segmentLoader;
-}
-
-module.exports = {loadForModule};