diff --git a/.babelrc b/.babelrc
index 82b89979..203a80b0 100644
--- a/.babelrc
+++ b/.babelrc
@@ -6,6 +6,9 @@
       }
     }]
   ],
+  "plugins": [
+    "transform-inline-environment-variables"
+  ],
   "env": {
     "test": {
       "plugins": [
diff --git a/.eslintrc.js b/.eslintrc.js
index 6630ad49..98df0bbf 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -30,7 +30,7 @@ module.exports = {
         "ecmaVersion": 2017
     },
     "env":{
-        "commonjs": true,
+        "node": true,
         "es6": true,
         "browser": true,
         "jest": true,
diff --git a/package.json b/package.json
index 208e0e02..4ba069b8 100644
--- a/package.json
+++ b/package.json
@@ -23,6 +23,7 @@
     "timers": "fake"
   },
   "devDependencies": {
+    "babel-plugin-transform-inline-environment-variables": "^0.2.0",
     "babel-plugin-transform-remove-console": "^6.8.5",
     "babel-preset-env": "^1.6.1",
     "codecov": "^3.0.0",
diff --git a/resources/assets/src/js/admin/common.js b/resources/assets/src/js/admin/common.js
index 0b326dc3..12544c40 100644
--- a/resources/assets/src/js/admin/common.js
+++ b/resources/assets/src/js/admin/common.js
@@ -51,7 +51,7 @@ async function sendFeedback() {
     }
 }
 
-if (typeof require !== 'undefined' && typeof module !== 'undefined') {
+if (process.env.NODE_ENV === 'test') {
     module.exports = {
         sendFeedback,
         initTables
diff --git a/resources/assets/src/js/admin/customize.js b/resources/assets/src/js/admin/customize.js
index bbf32d5b..711f82df 100644
--- a/resources/assets/src/js/admin/customize.js
+++ b/resources/assets/src/js/admin/customize.js
@@ -25,6 +25,6 @@ async function submitColor() {
 
 $('#color-submit').click(submitColor);
 
-if (typeof require !== 'undefined' && typeof module !== 'undefined') {
+if (process.env.NODE_ENV === 'test') {
     module.exports = submitColor;
 }
diff --git a/resources/assets/src/js/admin/players.js b/resources/assets/src/js/admin/players.js
index edd86c43..ba3fec8b 100644
--- a/resources/assets/src/js/admin/players.js
+++ b/resources/assets/src/js/admin/players.js
@@ -191,7 +191,7 @@ async function deletePlayer(pid) {
     }
 }
 
-if (typeof require !== 'undefined' && typeof module !== 'undefined') {
+if (process.env.NODE_ENV === 'test') {
     module.exports = {
         changeOwner,
         showNicknameInSwal,
diff --git a/resources/assets/src/js/admin/plugins.js b/resources/assets/src/js/admin/plugins.js
index 822ed534..f6f10c37 100644
--- a/resources/assets/src/js/admin/plugins.js
+++ b/resources/assets/src/js/admin/plugins.js
@@ -67,7 +67,7 @@ async function deletePlugin(name) {
     }
 }
 
-if (typeof require !== 'undefined' && typeof module !== 'undefined') {
+if (process.env.NODE_ENV === 'test') {
     module.exports = {
         deletePlugin,
         enablePlugin,
diff --git a/resources/assets/src/js/admin/tables.js b/resources/assets/src/js/admin/tables.js
index 97485622..d153d770 100644
--- a/resources/assets/src/js/admin/tables.js
+++ b/resources/assets/src/js/admin/tables.js
@@ -271,7 +271,7 @@ function initPluginsTable() {
   });
 }
 
-if (typeof require !== 'undefined' && typeof module !== 'undefined') {
+if (process.env.NODE_ENV === 'test') {
     module.exports = {
         initUsersTable,
         initPlayersTable,
diff --git a/resources/assets/src/js/admin/update.js b/resources/assets/src/js/admin/update.js
index 6c7193b3..3d885f43 100644
--- a/resources/assets/src/js/admin/update.js
+++ b/resources/assets/src/js/admin/update.js
@@ -101,7 +101,7 @@ async function checkForUpdates() {
     }
 }
 
-if (typeof require !== 'undefined' && typeof module !== 'undefined') {
+if (process.env.NODE_ENV === 'test') {
     module.exports = {
         checkForUpdates,
         progressPolling,
diff --git a/resources/assets/src/js/admin/users.js b/resources/assets/src/js/admin/users.js
index f650e76a..31fea525 100644
--- a/resources/assets/src/js/admin/users.js
+++ b/resources/assets/src/js/admin/users.js
@@ -215,7 +215,7 @@ $('body').on('keypress', '.score', function(event){
     }
 });
 
-if (typeof require !== 'undefined' && typeof module !== 'undefined') {
+if (process.env.NODE_ENV === 'test') {
     module.exports = {
         changeUserPwd,
         changeBanStatus,
diff --git a/resources/assets/src/js/auth/captcha.js b/resources/assets/src/js/auth/captcha.js
index 3d819568..c501668d 100644
--- a/resources/assets/src/js/auth/captcha.js
+++ b/resources/assets/src/js/auth/captcha.js
@@ -10,6 +10,6 @@ function refreshCaptcha() {
 
 $('.captcha').click(refreshCaptcha);
 
-if (typeof require !== 'undefined' && typeof module !== 'undefined') {
+if (process.env.NODE_ENV === 'test') {
     module.exports = refreshCaptcha;
 }
diff --git a/resources/assets/src/js/common/cookie.js b/resources/assets/src/js/common/cookie.js
index 15600f30..d66c7cc0 100644
--- a/resources/assets/src/js/common/cookie.js
+++ b/resources/assets/src/js/common/cookie.js
@@ -59,6 +59,6 @@ var docCookies = {
   }
 };
 
-if (typeof require !== 'undefined' && typeof module !== 'undefined') {
+if (process.env.NODE_ENV === 'test') {
     module.exports = docCookies;
 }
diff --git a/resources/assets/src/js/common/i18n.js b/resources/assets/src/js/common/i18n.js
index 9a4aacba..6afc4554 100644
--- a/resources/assets/src/js/common/i18n.js
+++ b/resources/assets/src/js/common/i18n.js
@@ -48,7 +48,7 @@ function trans(key, parameters = {}) {
     return temp;
 }
 
-if (typeof require !== 'undefined' && typeof module !== 'undefined') {
+if (process.env.NODE_ENV === 'test') {
     module.exports = {
         trans,
         loadLocales,
diff --git a/resources/assets/src/js/common/notify.js b/resources/assets/src/js/common/notify.js
index bbc1eb5c..4018361a 100644
--- a/resources/assets/src/js/common/notify.js
+++ b/resources/assets/src/js/common/notify.js
@@ -69,7 +69,7 @@ function showModal(msg, title = 'Message', type = 'default', options = {}) {
     }).modal(options);
 }
 
-if (typeof require !== 'undefined' && typeof module !== 'undefined') {
+if (process.env.NODE_ENV === 'test') {
     module.exports = {
         showMsg,
         showModal,
diff --git a/resources/assets/src/js/common/texture-preview.js b/resources/assets/src/js/common/texture-preview.js
index 6cb9d897..2555bfbf 100644
--- a/resources/assets/src/js/common/texture-preview.js
+++ b/resources/assets/src/js/common/texture-preview.js
@@ -115,6 +115,6 @@ $('.fa-pause').click(function () {
 $('.fa-forward').click(() => MSP.setStatus('running',  ! MSP.getStatus('running')));
 $('.fa-repeat' ).click(() => MSP.setStatus('rotation', ! MSP.getStatus('rotation')));
 
-if (typeof require !== 'undefined' && typeof module !== 'undefined') {
+if (process.env.NODE_ENV === 'test') {
     module.exports = TexturePreview;
 }
diff --git a/resources/assets/src/js/common/utils.js b/resources/assets/src/js/common/utils.js
index f40a476c..619b1ef5 100644
--- a/resources/assets/src/js/common/utils.js
+++ b/resources/assets/src/js/common/utils.js
@@ -139,7 +139,7 @@ function url(relativeUri = '') {
     return blessing.base_url + relativeUri;
 }
 
-if (typeof require !== 'undefined' && typeof module !== 'undefined') {
+if (process.env.NODE_ENV === 'test') {
     module.exports = {
         url,
         fetch,
diff --git a/resources/assets/src/js/skinlib/index.js b/resources/assets/src/js/skinlib/index.js
index a285889f..a4ddb041 100644
--- a/resources/assets/src/js/skinlib/index.js
+++ b/resources/assets/src/js/skinlib/index.js
@@ -226,7 +226,7 @@ function updateBreadCrumb() {
     }
 }
 
-if (typeof require !== 'undefined' && typeof module !== 'undefined') {
+if (process.env.NODE_ENV === 'test') {
     module.exports = {
         initSkinlib,
         renderSkinlib,
diff --git a/resources/assets/src/js/skinlib/operations.js b/resources/assets/src/js/skinlib/operations.js
index 4aa41b9e..b0ba74ed 100644
--- a/resources/assets/src/js/skinlib/operations.js
+++ b/resources/assets/src/js/skinlib/operations.js
@@ -222,7 +222,7 @@ async function deleteTexture(tid) {
     }
 }
 
-if (typeof require !== 'undefined' && typeof module !== 'undefined') {
+if (process.env.NODE_ENV === 'test') {
     module.exports = {
         toggleLiked,
         addToCloset,
diff --git a/resources/assets/src/js/skinlib/upload.js b/resources/assets/src/js/skinlib/upload.js
index 9977ba95..1b2788aa 100644
--- a/resources/assets/src/js/skinlib/upload.js
+++ b/resources/assets/src/js/skinlib/upload.js
@@ -131,6 +131,6 @@ function upload() {
     });
 }
 
-if (typeof require !== 'undefined' && typeof module !== 'undefined') {
+if (process.env.NODE_ENV === 'test') {
     module.exports = upload;
 }
diff --git a/resources/assets/src/js/user/closet.js b/resources/assets/src/js/user/closet.js
index c14a961b..7981cd10 100644
--- a/resources/assets/src/js/user/closet.js
+++ b/resources/assets/src/js/user/closet.js
@@ -337,7 +337,7 @@ async function setTexture() {
     }
 }
 
-if (typeof require !== 'undefined' && typeof module !== 'undefined') {
+if (process.env.NODE_ENV === 'test') {
     module.exports = {
         setAsAvatar,
         renderCloset,
diff --git a/resources/assets/src/js/user/player.js b/resources/assets/src/js/user/player.js
index 954bff41..c78caa7f 100644
--- a/resources/assets/src/js/user/player.js
+++ b/resources/assets/src/js/user/player.js
@@ -204,7 +204,7 @@ async function addNewPlayer() {
     }
 }
 
-if (typeof require !== 'undefined' && typeof module !== 'undefined') {
+if (process.env.NODE_ENV === 'test') {
     module.exports = {
         addNewPlayer,
         clearTexture,
diff --git a/resources/assets/src/js/user/profile.js b/resources/assets/src/js/user/profile.js
index e94b3f7a..814ad99f 100644
--- a/resources/assets/src/js/user/profile.js
+++ b/resources/assets/src/js/user/profile.js
@@ -181,7 +181,7 @@ async function deleteAccount() {
     }
 }
 
-if (typeof require !== 'undefined' && typeof module !== 'undefined') {
+if (process.env.NODE_ENV === 'test') {
     module.exports = {
         changeEmail,
         deleteAccount,
diff --git a/resources/assets/src/js/user/sign.js b/resources/assets/src/js/user/sign.js
index 27ff443e..37626e56 100644
--- a/resources/assets/src/js/user/sign.js
+++ b/resources/assets/src/js/user/sign.js
@@ -36,6 +36,6 @@ async function sign() {
     }
 }
 
-if (typeof require !== 'undefined' && typeof module !== 'undefined') {
+if (process.env.NODE_ENV === 'test') {
     module.exports = sign;
 }
diff --git a/yarn.lock b/yarn.lock
index d7a41151..290daf8a 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -685,6 +685,10 @@ babel-plugin-transform-exponentiation-operator@^6.22.0:
     babel-plugin-syntax-exponentiation-operator "^6.8.0"
     babel-runtime "^6.22.0"
 
+babel-plugin-transform-inline-environment-variables@^0.2.0:
+  version "0.2.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-transform-inline-environment-variables/-/babel-plugin-transform-inline-environment-variables-0.2.0.tgz#37dad411a819667fd69c33e72f7a14ea1a50ba98"
+
 babel-plugin-transform-regenerator@^6.22.0:
   version "6.26.0"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-regenerator/-/babel-plugin-transform-regenerator-6.26.0.tgz#e0703696fbde27f0a3efcacf8b4dca2f7b3a8f2f"