refactor: add comments

Author: lmiller1990

src/stubs.ts

@@ -91,10 +91,8 @@ export function stubComponents(
   transformVNodeArgs((args, instance: ComponentInternalInstance | null) => {
     const [nodeType, props, children, patchFlag, dynamicProps] = args
     const type = nodeType as VNodeTypes
-    // args[0] can either be:
-    // 1. a HTML tag (div, span...)
-    // 2. An object of component options, such as { name: 'foo', render: [Function], props: {...} }
-    // Depending what it is, we do different things.
+
+    // stub transition by default via config.global.stubs
     if (type === Transition && stubs['transition']) {
       return [
         createTransitionStub({ name: 'transition-stub', props: undefined }),
@@ -103,6 +101,7 @@ export function stubComponents(
       ]
     }
 
+    // stub transition-group by default via config.global.stubs
     if (type === TransitionGroup && stubs['transition-group']) {
       return [
         createTransitionStub({
@@ -114,6 +113,10 @@ export function stubComponents(
       ]
     }
 
+    // args[0] can either be:
+    // 1. a HTML tag (div, span...)
+    // 2. An object of component options, such as { name: 'foo', render: [Function], props: {...} }
+    // Depending what it is, we do different things.
     if (
       isHTMLElement(type) ||
       isCommentOrFragment(type) ||