ES5 compressor

Gemfile

@@ -9,7 +9,6 @@ gem 'bootstrap-datepicker-rails'
 gem 'faker'
 gem 'jquery-rails'
 
-
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '~> 5.1.5'
 # Use postgresql as the database for Active Record

Gemfile.lock

@@ -70,7 +70,6 @@ GEM
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
-    libv8 (3.16.14.19)
     listen (3.1.5)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
@@ -80,8 +79,6 @@ GEM
       nokogiri (>= 1.5.9)
     mail (2.7.0)
       mini_mime (>= 0.1.1)
-    materialize-sass (0.100.2)
-      sass (~> 3.3)
     method_source (0.9.0)
     mini_mime (1.0.0)
     mini_portile2 (2.3.0)
@@ -90,6 +87,7 @@ GEM
     nio4r (2.2.0)
     nokogiri (1.8.2)
       mini_portile2 (~> 2.3.0)
+    parslet (1.8.2)
     pg (1.0.0)
     puma (3.11.2)
     rack (2.0.4)
@@ -122,7 +120,6 @@ GEM
     rb-fsevent (0.10.2)
     rb-inotify (0.9.10)
       ffi (>= 0.5.0, < 2)
-    ref (2.0.0)
     ruby_dep (1.5.0)
     sass (3.5.5)
       sass-listen (~> 4.0.0)
@@ -147,12 +144,10 @@ GEM
       actionpack (>= 4.0)
       activesupport (>= 4.0)
       sprockets (>= 3.0.0)
-    therubyracer (0.12.3)
-      libv8 (~> 3.16.14.15)
-      ref
     thor (0.20.0)
     thread_safe (0.3.6)
     tilt (2.0.8)
+    trollop (2.1.2)
     turbolinks (5.1.0)
       turbolinks-source (~> 5.1)
     turbolinks-source (5.1.0)
@@ -166,6 +161,10 @@ GEM
     websocket-driver (0.6.5)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.3)
+    yarn (0.1.1)
+      parslet (>= 1.2)
+      rack (>= 1.3)
+      trollop (>= 1.16)
 
 PLATFORMS
   ruby
@@ -179,17 +178,16 @@ DEPENDENCIES
   jbuilder (~> 2.5)
   jquery-rails
   listen (>= 3.0.5, < 3.2)
-  materialize-sass
   pg (>= 0.18, < 2.0)
   puma (~> 3.7)
   rails (~> 5.1.5)
   sass-rails (~> 5.0)
   spring
   spring-watcher-listen (~> 2.0.0)
-  therubyracer
   turbolinks (~> 5)
   tzinfo-data
   web-console (>= 3.3.0)
+  yarn
 
 BUNDLED WITH
    1.16.1