Start GraphQL support

src-web/components/Editor/extensions.ts

@@ -32,6 +32,7 @@ import {
   rectangularSelection,
 } from '@codemirror/view';
 import { tags as t } from '@lezer/highlight';
+import { graphqlLanguageSupport } from 'cm6-graphql';
 import { debouncedAutocompletionDisplay } from './autocomplete';
 import { twig } from './twig/extension';
 import { url } from './url/extension';
@@ -77,6 +78,7 @@ export const myHighlightStyle = HighlightStyle.define([
 // ]);
 
 const syntaxExtensions: Record<string, LanguageSupport> = {
+  'application/graphql+json': graphqlLanguageSupport(),
   'application/json': json(),
   'application/javascript': javascript(),
   'text/html': html(),