refactor(compiler-core): improve template type handling

packages/compiler-core/__tests__/parse.spec.ts

@@ -526,7 +526,6 @@ describe('compiler: parse', () => {
         tagType: ElementTypes.ELEMENT,
         codegenNode: undefined,
         props: [],
-
         isSelfClosing: false,
         children: [],
         loc: {
@@ -583,6 +582,24 @@ describe('compiler: parse', () => {
       })
     })
 
+    test('template element with directives', () => {
+      const ast = baseParse('<template v-if="ok"></template>')
+      const element = ast.children[0]
+      expect(element).toMatchObject({
+        type: NodeTypes.ELEMENT,
+        tagType: ElementTypes.TEMPLATE
+      })
+    })
+
+    test('template element without directives', () => {
+      const ast = baseParse('<template></template>')
+      const element = ast.children[0]
+      expect(element).toMatchObject({
+        type: NodeTypes.ELEMENT,
+        tagType: ElementTypes.ELEMENT
+      })
+    })
+
     test('native element with `isNativeTag`', () => {
       const ast = baseParse('<div></div><comp></comp><Comp></Comp>', {
         isNativeTag: tag => tag === 'div'