Coffee generator template fixed for Webpack syntax

Author: ViXP

lib/generators/react/component_generator.rb

@@ -130,9 +130,7 @@ def component_name
       def file_header
         if webpacker?
           if options[:coffee]
-            %|import React from 'react'\n|
-            %|import PropTypes from 'prop-types'\n|
-            %|export default |
+            %|import React from 'react'\nimport PropTypes from 'prop-types'\n|
           else
             %|var React = require("react")\n|
           end

lib/generators/templates/component.js.jsx.coffee

@@ -1,5 +1,5 @@
 <%= file_header %>
-class @<%= component_name %> extends React.Component
+export default class @<%= component_name %> extends React.Component
 <% if attributes.size > 0 -%>
   @propTypes =
 <% attributes.each do |attribute| -%>
@@ -17,5 +17,4 @@ class @<%= component_name %> extends React.Component
 <% else -%>
     `<div />`
 <% end -%>
-
-<%= file_footer %>
+<%= file_footer %>