Remove console statements in release build

.babelrc

@@ -8,5 +8,10 @@
       "identifier": "m",
       "moduleName": "mithril"
     }]
-  ]
+  ],
+  "env": {
+    "production": {
+      "plugins": ["transform-remove-console"]
+    }
+  }
 }

package.json

@@ -25,6 +25,7 @@
   "devDependencies": {
     "babel-plugin-transform-react-jsx": "~6.8.0",
     "babel-plugin-transform-react-require": "~1.0.1",
+    "babel-plugin-transform-remove-console": "^6.8.0",
     "gulp": "~3.9.1",
     "gulp-autoprefixer": "~3.1.1",
     "gulp-preprocess": "~2.0.0",
@@ -63,7 +64,7 @@
     "build-js-dev": "gulp --target='cordova' --env=env-dev.json",
     "build-js-stage": "gulp --target='cordova' --env=env-stage.json",
     "build-js-prod": "gulp --target='cordova' --env=env-prod.json",
-    "build-js-release": "gulp --mode='release' --target='cordova' --env=env-prod.json",
+    "build-js-release": "BABEL_ENV=production gulp --mode='release' --target='cordova' --env=env-prod.json",
     "android-dev": "npm run build-js-dev && cordova run android",
     "android-stage": "npm run build-js-stage && cordova run android",
     "android-prod": "npm run build-js-prod && cordova run android",

yarn.lock

@@ -530,6 +530,12 @@ babel-plugin-transform-regenerator@^6.16.0:
     babel-types "^6.16.0"
     private "~0.1.5"
 
+babel-plugin-transform-remove-console@^6.8.0:
+  version "6.8.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-transform-remove-console/-/babel-plugin-transform-remove-console-6.8.0.tgz#c4162f01ee169491776e64093f4dad8d61125a90"
+  dependencies:
+    babel-runtime "^6.0.0"
+
 babel-plugin-transform-strict-mode@^6.18.0:
   version "6.18.0"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-strict-mode/-/babel-plugin-transform-strict-mode-6.18.0.tgz#df7cf2991fe046f44163dcd110d5ca43bc652b9d"