Merge branch 'js-load-specific-locales' into 'master'

Load only the currently needed JS locale file

Closes #38470

See merge request gitlab-org/gitlab-ce!14533

app/assets/javascripts/locale/index.js

 import Jed from 'jed';
-
 import sprintf from './sprintf';
 
-/**
-  This is required to require all the translation folders in the current directory
-  this saves us having to do this manually & keep up to date with new languages
-**/
-function requireAll(requireContext) { return requireContext.keys().map(requireContext); }
-
-const allLocales = requireAll(require.context('./', true, /^(?!.*(?:index.js$)).*\.js$/));
-const locales = allLocales.reduce((d, obj) => {
-  const data = d;
-  const localeKey = Object.keys(obj)[0];
-
-  data[localeKey] = obj[localeKey];
-
-  return data;
-}, {});
-
 const langAttribute = document.querySelector('html').getAttribute('lang');
 const lang = (langAttribute || 'en').replace(/-/g, '_');
-const locale = new Jed(locales[lang]);
+const locale = new Jed(window.translations || {});
 
 /**
   Translates `text`
-
   @param text The text to be translated
   @returns {String} The translated text
 **/

app/views/layouts/_head.html.haml

@@ -37,9 +37,9 @@
   - if content_for?(:library_javascripts)
     = yield :library_javascripts
 
+  = javascript_include_tag asset_path("locale/#{I18n.locale.to_s || I18n.default_locale.to_s}/app.js")
   = webpack_bundle_tag "webpack_runtime"
   = webpack_bundle_tag "common"
-  = webpack_bundle_tag "locale"
   = webpack_bundle_tag "main"
   = webpack_bundle_tag "raven" if current_application_settings.clientside_sentry_enabled
   = webpack_bundle_tag "test" if Rails.env.test?

config/application.rb

@@ -105,6 +105,7 @@ module Gitlab
     config.assets.precompile << "lib/ace.js"
     config.assets.precompile << "vendor/assets/fonts/*"
     config.assets.precompile << "test.css"
+    config.assets.precompile << "locale/**/app.js"
 
     # Version of your assets, change this if you want to expire all your assets
     config.assets.version = '1.0'

config/initializers/gettext_rails_i18n_patch.rb

@@ -39,3 +39,17 @@ module GettextI18nRailsJs
     end
   end
 end
+
+class PoToJson
+  # This is required to modify the JS locale file output to our import needs
+  # Overwrites: https://github.com/webhippie/po_to_json/blob/master/lib/po_to_json.rb#L46
+  def generate_for_jed(language, overwrite = {})
+    @options = parse_options(overwrite.merge(language: language))
+    @parsed ||= inject_meta(parse_document)
+
+    generated = build_json_for(build_jed_for(@parsed))
+    [
+      "window.translations = #{generated};"
+    ].join(" ")
+  end
+end

config/webpack.config.js

@@ -122,10 +122,6 @@ var config = {
           name: '[name].[hash].[ext]',
         }
       },
-      {
-        test: /locale\/\w+\/(.*)\.js$/,
-        loader: 'exports-loader?locales',
-      },
       {
         test: /monaco-editor\/\w+\/vs\/loader\.js$/,
         use: [
@@ -224,7 +220,7 @@ var config = {
 
     // create cacheable common library bundles
     new webpack.optimize.CommonsChunkPlugin({
-      names: ['main', 'locale', 'common', 'webpack_runtime'],
+      names: ['main', 'common', 'webpack_runtime'],
     }),
 
     // enable scope hoisting

lib/tasks/gitlab/assets.rake

@@ -3,8 +3,8 @@ namespace :gitlab do
     desc 'GitLab | Assets | Compile all frontend assets'
     task compile: [
       'yarn:check',
-      'rake:assets:precompile',
       'gettext:po_to_json',
+      'rake:assets:precompile',
       'webpack:compile',
       'fix_urls'
     ]