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node_modules/react-dev-utils/errorOverlayMiddleware.js

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+/**
+ * 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.
+ */
+'use strict';
+
+const launchEditor = require('./launchEditor');
+const launchEditorEndpoint = require('./launchEditorEndpoint');
+
+module.exports = function createLaunchEditorMiddleware() {
+  return function launchEditorMiddleware(req, res, next) {
+    if (req.url.startsWith(launchEditorEndpoint)) {
+      const lineNumber = parseInt(req.query.lineNumber, 10) || 1;
+      const colNumber = parseInt(req.query.colNumber, 10) || 1;
+      launchEditor(req.query.fileName, lineNumber, colNumber);
+      res.end();
+    } else {
+      next();
+    }
+  };
+};