Remove function option

Author: ahangarha

lib/generators/react/component_generator.rb

@@ -65,12 +65,6 @@ class ComponentGenerator < ::Rails::Generators::NamedBase
                    default: false,
                    desc: 'Output coffeescript based component'
 
-      class_option :function,
-                   type: :boolean,
-                   default: false,
-                   aliases: '--func',
-                   desc: 'Output function based component'
-
       REACT_PROP_TYPES = {
         'node' =>        'PropTypes.node',
         'bool' =>        'PropTypes.bool',
@@ -132,8 +126,6 @@ def create_component_file
           'js.jsx.coffee'
         elsif options[:ts]
           'js.jsx.tsx'
-        elsif options[:function]
-          'func.jsx'
         elsif options[:es6] || webpacker?
           'es6.jsx'
         else