FIX: 6to5 was renamed to Babel

I can't believe they just pulled the old gem and broke people deploying
our site to production. I get it, your name changed, but don't break
other people's apps with no deprecations.

Gemfile

@@ -107,7 +107,7 @@ gem 'ember-rails'
 gem 'ember-source', '1.9.0.beta.4'
 gem 'handlebars-source', '2.0.0'
 gem 'barber'
-gem '6to5'
+gem 'babel-transpiler'
 
 gem 'message_bus'
 gem 'rails_multisite', path: 'vendor/gems/rails_multisite'

Gemfile.lock

@@ -6,10 +6,6 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    6to5 (0.5.0)
-      6to5-source (>= 1.14, < 4)
-      execjs (~> 2.0)
-    6to5-source (3.3.7)
     CFPropertyList (2.2.8)
     actionmailer (4.1.9)
       actionpack (= 4.1.9)
@@ -45,6 +41,10 @@ GEM
       activerecord (>= 2.3.0)
       rake (>= 0.8.7)
     arel (5.0.1.20140414130214)
+    babel-source (4.6.6)
+    babel-transpiler (0.6.0)
+      babel-source (>= 4.0, < 5)
+      execjs (~> 2.0)
     barber (0.5.0)
       ember-source
       execjs
@@ -456,10 +456,10 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  6to5
   actionpack-action_caching
   active_model_serializers (~> 0.8.0)
   annotate
+  babel-transpiler
   barber
   better_errors
   binding_of_caller

lib/es6_module_transpiler/tilt/es6_module_transpiler_template.rb

@@ -1,7 +1,22 @@
 require 'execjs'
-require '6to5'
+require 'babel/transpiler'
 
 module Tilt
+
+  class Console
+    def initialize(prefix=nil)
+      @prefix = prefix || ''
+    end
+
+    def log(msg)
+      Rails.logger.info("#{@prefix}#{msg}")
+    end
+
+    def error(msg)
+      Rails.logger.error("#{@prefix}#{msg}")
+    end
+  end
+
   class ES6ModuleTranspilerTemplate < Tilt::Template
     self.default_mime_type = 'application/javascript'
 
@@ -15,7 +30,7 @@ module Tilt
 
     def self.create_new_context
       ctx = V8::Context.new(timeout: 5000)
-      ctx.eval("var self = this; #{File.read(ES6to5::Source.path)}")
+      ctx.eval("var self = this; #{File.read(Babel::Transpiler.script_path)}")
       ctx.eval("module = {}; exports = {};");
       ctx.load("#{Rails.root}/lib/es6_module_transpiler/support/es6-module-transpiler.js")
       ctx
@@ -64,6 +79,7 @@ module Tilt
 
       klass = self.class
       klass.protect do
+        klass.v8['console'] = Console.new("BABEL: #{scope.logical_path}: ")
         @output = klass.v8.eval(generate_source(scope))
       end
 
@@ -118,7 +134,7 @@ module Tilt
 
     def generate_source(scope)
       js_source = ::JSON.generate(data, quirks_mode: true)
-      js_source = "to5.transform(#{js_source}, {ast: false, whitelist: ['es6.constants', 'es6.properties.shorthand', 'es6.arrowFunctions', 'es6.blockScoping']})['code']"
+      js_source = "babel.transform(#{js_source}, {ast: false, whitelist: ['es6.constants', 'es6.properties.shorthand', 'es6.arrowFunctions', 'es6.blockScoping']})['code']"
       "new module.exports.Compiler(#{js_source}, '#{module_name(scope.root_path, scope.logical_path)}', #{compiler_options}).#{compiler_method}()"
     end