diff --git a/packager.js b/packager.js
index 0c4a21c2..bd9ae8ee 100644
--- a/packager.js
+++ b/packager.js
@@ -24,6 +24,7 @@ const openStackFrameInEditorMiddleware = require('./openStackFrameInEditorMiddle
 const parseCommandLine = require('./parseCommandLine.js');
 const ReactPackager = require('./react-packager');
 const statusPageMiddleware = require('./statusPageMiddleware.js');
+const systraceProfileMiddleware = require('./systraceProfileMiddleware.js');
 const webSocketProxy = require('./webSocketProxy.js');
 
 var options = parseCommandLine([{
@@ -168,44 +169,6 @@ function loadRawBody(req, res, next) {
   });
 }
 
-function systraceProfileMiddleware(req, res, next) {
-  if (req.url !== '/systrace') {
-    next();
-    return;
-  }
-
-  console.log('Dumping profile information...');
-  var dumpName = '/tmp/dump_' + Date.now() + '.json';
-  var prefix = process.env.TRACE_VIEWER_PATH || '';
-  var cmd = path.join(prefix, 'trace2html') + ' ' + dumpName;
-  fs.writeFileSync(dumpName, req.rawBody);
-  childProcess.exec(cmd, function(error) {
-    if (error) {
-      if (error.code === 127) {
-        var response = '\n** Failed executing `' + cmd + '` **\n\n' +
-          'Google trace-viewer is required to visualize the data, You can install it with `brew install trace2html`\n\n' +
-          'NOTE: Your profile data was kept at:\n' + dumpName
-        console.log(response);
-        res.end(response);
-      } else {
-        console.error(error);
-        res.end('Unknown error: ' + error.message);
-      }
-      return;
-    } else {
-      childProcess.exec('rm ' + dumpName);
-      childProcess.exec('open ' + dumpName.replace(/json$/, 'html'), function(err) {
-        if (err) {
-          console.error(err);
-          res.end(err.message);
-        } else {
-          res.end();
-        }
-      });
-    }
-  });
-}
-
 function cpuProfileMiddleware(req, res, next) {
   if (req.url !== '/cpu-profile') {
     next();
diff --git a/systraceProfileMiddleware.js b/systraceProfileMiddleware.js
new file mode 100644
index 00000000..02b274c9
--- /dev/null
+++ b/systraceProfileMiddleware.js
@@ -0,0 +1,52 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+'use strict';
+
+const exec = require('child_process').exec;
+const fs = require('fs');
+const path = require('path');
+
+module.exports = function(req, res, next) {
+  if (req.url !== '/systrace') {
+    next();
+    return;
+  }
+
+  console.log('Dumping profile information...');
+  var dumpName = '/tmp/dump_' + Date.now() + '.json';
+  var prefix = process.env.TRACE_VIEWER_PATH || '';
+  var cmd = path.join(prefix, 'trace2html') + ' ' + dumpName;
+  fs.writeFileSync(dumpName, req.rawBody);
+  exec(cmd, function(error) {
+    if (error) {
+      if (error.code === 127) {
+        var response = '\n** Failed executing `' + cmd + '` **\n\n' +
+          'Google trace-viewer is required to visualize the data, ' +
+          'You can install it with `brew install trace2html`\n\n' +
+          'NOTE: Your profile data was kept at:\n' + dumpName;
+        console.log(response);
+        res.end(response);
+      } else {
+        console.error(error);
+        res.end('Unknown error: ' + error.message);
+      }
+      return;
+    } else {
+      exec('rm ' + dumpName);
+      exec('open ' + dumpName.replace(/json$/, 'html'), function(err) {
+        if (err) {
+          console.error(err);
+          res.end(err.message);
+        } else {
+          res.end();
+        }
+      });
+    }
+  });
+};