Parse translate filters from JS files.

config/initializers/gettext_rails_i18n_patch.rb

 require 'gettext_i18n_rails/haml_parser'
+require 'gettext_i18n_rails_js/parser/javascript'
+
+VUE_TRANSLATE_REGEX = /{{ ([^{]*)( \| translate) }}/
+VUE_TRANSLATE_PLURAL_REGEX = /{{ ([^{]*)( \| translate-plural\((.*), (.*)\)) }}/
 
 module GettextI18nRails
   class HamlParser
@@ -9,14 +13,37 @@ module GettextI18nRails
     # If we found a content like "{{ 'Stage' | translate }}"
     # in a HAML file we convert it to "= _('Stage')", that way
     # it can be processed by the "rake gettext:find" script.
+    # Overwrites: https://github.com/grosser/gettext_i18n_rails/blob/8396387a431e0f8ead72fc1cd425cad2fa4992f2/lib/gettext_i18n_rails/haml_parser.rb#L9
     def self.convert_to_code(text)
       # {{ 'Stage' | translate }} => = _('Stage')
-      text.gsub!(/{{ (.*)( \| translate) }}/, "= _(\\1)")
+      text.gsub!(VUE_TRANSLATE_REGEX, "= _(\\1)")
 
       # {{ 'user' | translate-plural('users', users.size) }} => = n_('user', 'users', users.size)
-      text.gsub!(/{{ (.*)( \| translate-plural\((.*), (.*)\)) }}/, "= n_(\\1, \\3, \\4)")
+      text.gsub!(VUE_TRANSLATE_PLURAL_REGEX, "= n_(\\1, \\3, \\4)")
 
       old_convert_to_code(text)
     end
   end
 end
+
+module GettextI18nRailsJs
+  module Parser
+    module Javascript
+      protected
+
+      # Overwrites: https://github.com/webhippie/gettext_i18n_rails_js/blob/46c58db6d2053a4f5f36a0eb024ea706ff5707cb/lib/gettext_i18n_rails_js/parser/javascript.rb#L46
+      def collect_for(value)
+        ::File.open(value) do |f|
+          f.each_line.each_with_index.collect do |line, idx|
+            line.gsub!(VUE_TRANSLATE_REGEX, "__(\\1)")
+            line.gsub!(VUE_TRANSLATE_PLURAL_REGEX, "n__(\\1, \\3, \\4)")
+
+            line.scan(invoke_regex).collect do |function, arguments|
+              yield(function, arguments, idx + 1)
+            end
+          end.inject([], :+).compact
+        end
+      end
+    end
+  end
+end