refactor: remove null comparisons

packages/runtime-test/src/nodeOps.ts

@@ -139,7 +139,7 @@ function setText(node: TestText, text: string) {
 
 function insert(child: TestNode, parent: TestElement, ref?: TestNode | null) {
   let refIndex
-  if (ref != null) {
+  if (ref) {
     refIndex = parent.children.indexOf(ref)
     if (refIndex === -1) {
       console.error('ref: ', ref)
@@ -168,7 +168,7 @@ function insert(child: TestNode, parent: TestElement, ref?: TestNode | null) {
 
 function remove(child: TestNode, logOp: boolean = true) {
   const parent = child.parentNode
-  if (parent != null) {
+  if (parent) {
     if (logOp) {
       logNodeOp({
         type: NodeOpTypes.REMOVE,