Docs of cfn language are always templates

Author: kddejong

src/document/Document.ts

@@ -65,6 +65,11 @@ export class Document {
     }
 
     private detectCfnFileType(): CloudFormationFileType {
+        // If languageId is cloudformation, treat as template
+        if (this.languageId === 'cloudformation') {
+            return CloudFormationFileType.Template;
+        }
+
         if (!this.cachedParsedContent || typeof this.cachedParsedContent !== 'object') {
             return CloudFormationFileType.Unknown;
         }

tst/unit/document/Document.test.ts

@@ -166,6 +166,14 @@ describe('Document', () => {
 
     describe('CloudFormation detection', () => {
         describe('should detect CloudFormation templates', () => {
+            it('with languageId cloudformation', () => {
+                const content = '{}'; // Empty content
+                const textDocument = TextDocument.create('file:///test.json', 'cloudformation', 1, content);
+                const doc = new Document(textDocument);
+
+                expect(doc.cfnFileType).toBe(CloudFormationFileType.Template);
+            });
+
             it('with AWSTemplateFormatVersion', () => {
                 const content = '{"AWSTemplateFormatVersion": "2010-09-09"}';
                 const textDocument = TextDocument.create('file:///test.json', 'json', 1, content);