diff --git a/local-cli/util/log.js b/local-cli/util/log.js
index 018c5275a2197a..16bbbae58e7a64 100644
--- a/local-cli/util/log.js
+++ b/local-cli/util/log.js
@@ -8,8 +8,17 @@
  */
 'use strict';
 
+var _enabled = true;
+
+function disable() {
+  _enabled = false;
+}
+
 function log(stream, module) {
   return function() {
+    if (!_enabled) {
+      return;
+    }
     const message = Array.prototype.slice.call(arguments).join(' ');
     stream.write(module + ': ' + message + '\n');
   };
@@ -17,3 +26,4 @@ function log(stream, module) {
 
 module.exports.out = log.bind(null, process.stdout);
 module.exports.err = log.bind(null, process.stderr);
+module.exports.disable = disable;
diff --git a/packager/react-packager/src/Bundler/index.js b/packager/react-packager/src/Bundler/index.js
index 3ec53f3407dd05..75d89877d681e2 100644
--- a/packager/react-packager/src/Bundler/index.js
+++ b/packager/react-packager/src/Bundler/index.js
@@ -81,6 +81,10 @@ const validateOpts = declareOpts({
     type: 'number',
     required: false,
   },
+  silent: {
+    type: 'boolean',
+    default: false,
+  },
 });
 
 class Bundler {
@@ -352,8 +356,8 @@ class Bundler {
     const modulesByName = Object.create(null);
 
     if (!resolutionResponse) {
-      let onProgess;
-      if (process.stdout.isTTY) {
+      let onProgess = noop;
+      if (process.stdout.isTTY && !this._opts.silent) {
         const bar = new ProgressBar(
           'transformed :current/:total (:percent)',
           {complete: '=', incomplete: ' ', width: 40, total: 1},
diff --git a/packager/react-packager/src/Server/index.js b/packager/react-packager/src/Server/index.js
index fe49ebbb354d75..c52762f6c44c66 100644
--- a/packager/react-packager/src/Server/index.js
+++ b/packager/react-packager/src/Server/index.js
@@ -73,6 +73,10 @@ const validateOpts = declareOpts({
     type: 'string',
     required: false,
   },
+  silent: {
+    type: 'boolean',
+    default: false,
+  },
 });
 
 const bundleOpts = declareOpts({