[Code] Enabgle go language of the monaco editor. (#33476)

This change will make the code plugin have the ability in the
development mode to highlight the go source code and send
the go-to definition request to the lang server.

Author: Henry Wong

x-pack/plugins/code/public/monaco/monaco.ts

@@ -63,7 +63,7 @@ import lightTheme from '@elastic/eui/dist/eui_theme_light.json';
 // import 'monaco-editor/esm/vs/basic-languages/css/css.contribution.js';
 // import 'monaco-editor/esm/vs/basic-languages/dockerfile/dockerfile.contribution.js';
 // import 'monaco-editor/esm/vs/basic-languages/fsharp/fsharp.contribution.js';
-// import 'monaco-editor/esm/vs/basic-languages/go/go.contribution.js';
+import 'monaco-editor/esm/vs/basic-languages/go/go.contribution.js';
 // import 'monaco-editor/esm/vs/basic-languages/handlebars/handlebars.contribution.js';
 // import 'monaco-editor/esm/vs/basic-languages/html/html.contribution.js';
 // import 'monaco-editor/esm/vs/basic-languages/ini/ini.contribution.js';

x-pack/plugins/code/public/monaco/monaco_helper.ts

@@ -5,6 +5,7 @@
  */
 
 import { editor } from 'monaco-editor';
+import chrome from 'ui/chrome';
 import { ResizeChecker } from 'ui/resize_checker';
 import { EditorActions } from '../components/editor/editor';
 import { provideDefinition } from './definition/definition_provider';
@@ -43,6 +44,9 @@ export class MonacoHelper {
       this.monaco.languages.registerDefinitionProvider('java', definitionProvider);
       this.monaco.languages.registerDefinitionProvider('typescript', definitionProvider);
       this.monaco.languages.registerDefinitionProvider('javascript', definitionProvider);
+      if (chrome.getInjected('enableLangserversDeveloping', false) === true) {
+        this.monaco.languages.registerDefinitionProvider('go', definitionProvider);
+      }
       const codeEditorService = new EditorService();
       codeEditorService.setMonacoHelper(this);
       this.editor = monaco.editor.create(

x-pack/plugins/code/server/init.ts

@@ -133,14 +133,18 @@ async function initCodeNode(server: Server, serverOptions: ServerOptions, log: L
   log.info('Initializing Code plugin as code-node.');
   const queueIndex: string = server.config().get('xpack.code.queueIndex');
   const queueTimeout: number = server.config().get('xpack.code.queueTimeout');
+  const devMode: boolean = server.config().get('env.dev');
   const adminCluster = server.plugins.elasticsearch.getCluster('admin');
 
   // @ts-ignore
   const esClient: EsClient = adminCluster.clusterClient.client;
   const repoConfigController = new RepositoryConfigController(esClient);
 
+  server.injectUiAppVars('code', () => ({
+    enableLangserversDeveloping: devMode,
+  }));
   // Enable the developing language servers in development mode.
-  if (server.config().get('env.dev') === true) {
+  if (devMode === true) {
     LanguageServers.push(...LanguageServersDeveloping);
   }