diff --git a/local-cli/server/middleware/getDevToolsMiddleware.js b/local-cli/server/middleware/getDevToolsMiddleware.js
index 515e11ed8..3f13fe3ab 100644
--- a/local-cli/server/middleware/getDevToolsMiddleware.js
+++ b/local-cli/server/middleware/getDevToolsMiddleware.js
@@ -8,11 +8,11 @@
  */
 'use strict';
 
-const child_process = require('child_process');
-const execFile = require('child_process').execFile;
 const fs = require('fs');
-const path = require('path');
 const launchChrome = require('../util/launchChrome');
+const path = require('path');
+
+const {exec} = require('child_process');
 
 function launchChromeDevTools(port) {
   var debuggerURL = 'http://localhost:' + port + '/debugger-ui';
@@ -20,25 +20,25 @@ function launchChromeDevTools(port) {
   launchChrome(debuggerURL);
 }
 
-function escapePath(path) {
-  return '"' + path + '"'; // " Can escape paths with spaces in OS X, Windows, and *nix
+function escapePath(pathname) {
+  return '"' + pathname + '"'; // " Can escape paths with spaces in OS X, Windows, and *nix
 }
 
-function launchDevTools(options, isChromeConnected) {
+function launchDevTools({port, projectRoots}, isChromeConnected) {
   // Explicit config always wins
   var customDebugger = process.env.REACT_DEBUGGER;
   if (customDebugger) {
-    var projects = options.projectRoots.map(escapePath).join(' ');
+    var projects = projectRoots.map(escapePath).join(' ');
     var command = customDebugger + ' ' + projects;
     console.log('Starting custom debugger by executing: ' + command);
-    child_process.exec(command, function (error, stdout, stderr) {
+    exec(command, function (error, stdout, stderr) {
       if (error !== null) {
         console.log('Error while starting custom debugger: ' + error);
       }
     });
   } else if (!isChromeConnected()) {
     // Dev tools are not yet open; we need to open a session
-    launchChromeDevTools(options.port);
+    launchChromeDevTools(port);
   }
 }
 
diff --git a/local-cli/server/middleware/openStackFrameInEditorMiddleware.js b/local-cli/server/middleware/openStackFrameInEditorMiddleware.js
index 682f3aa48..b94598f21 100644
--- a/local-cli/server/middleware/openStackFrameInEditorMiddleware.js
+++ b/local-cli/server/middleware/openStackFrameInEditorMiddleware.js
@@ -10,11 +10,11 @@
 
 const launchEditor = require('../util/launchEditor');
 
-module.exports = function(args) {
+module.exports = function({projectRoots}) {
   return function(req, res, next) {
     if (req.url === '/open-stack-frame') {
-      var frame = JSON.parse(req.rawBody);
-      launchEditor(frame.file, frame.lineNumber, args['projectRoots']);
+      const frame = JSON.parse(req.rawBody);
+      launchEditor(frame.file, frame.lineNumber, projectRoots);
       res.end('OK');
     } else {
       next();