Move error overlay middleware (#2216)

packages/react-error-overlay/middleware.js

@@ -0,0 +1,23 @@
+/**
+ * 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.
+ */
+'use strict';
+
+const launchEditor = require('react-dev-utils/launchEditor');
+
+module.exports = function createLaunchEditorMiddleware() {
+  return function launchEditorMiddleware(req, res, next) {
+    // Keep this in sync with react-error-overlay
+    if (req.url.startsWith('/__open-stack-frame-in-editor')) {
+      launchEditor(req.query.fileName, req.query.lineNumber);
+      res.end();
+    } else {
+      next();
+    }
+  };
+};

packages/react-error-overlay/package.json

@@ -27,7 +27,8 @@
   ],
   "author": "Joe Haddad <timer150@gmail.com>",
   "files": [
-    "lib/"
+    "lib/",
+    "middleware.js"
   ],
   "dependencies": {
     "anser": "1.2.5",

packages/react-error-overlay/src/components/frame.js

@@ -277,6 +277,7 @@ function createFrame(
       .indexOf(' ') !== -1;
     if (!isInternalWebpackBootstrapCode) {
       onSourceClick = () => {
+        // Keep this in sync with react-error-overlay/middleware.js
         fetch(
           '/__open-stack-frame-in-editor?fileName=' +
             window.encodeURIComponent(sourceFileName) +