Add go snippet support (#709)

common/deps.ts

@@ -59,6 +59,7 @@ export { toml as tomlLanguage } from "@codemirror/legacy-modes/mode/toml?externa
 export { xml as xmlLanguage } from "@codemirror/legacy-modes/mode/xml?external=@codemirror/language&target=es2022";
 export { json as jsonLanguage } from "@codemirror/legacy-modes/mode/javascript?external=@codemirror/language&target=es2022";
 export { htmlLanguage } from "@codemirror/lang-html";
+export { go as goLanguage } from "@codemirror/legacy-modes/mode/go?external=@codemirror/language&target=es2022";
 
 export { Language, StreamLanguage } from "@codemirror/language";
 

common/languages.ts

@@ -24,6 +24,7 @@ import {
   typescriptLanguage,
   xmlLanguage,
   yamlLanguage,
+  goLanguage,
 } from "./deps.ts";
 import {
   extendedMarkdownLanguage,
@@ -83,6 +84,8 @@ export const builtinLanguages: Record<string, Language> = {
   "objective-c++": StreamLanguage.define(objectiveCppLanguage),
   "objectivec++": StreamLanguage.define(objectiveCppLanguage),
   "dart": StreamLanguage.define(dartLanguage),
+  "go": StreamLanguage.define(goLanguage),
+  "golang": StreamLanguage.define(goLanguage),
   "query": LRLanguage.define({
     name: "query",
     parser: highlightingQueryParser,