Improve comment handling between if statement condition and the "body" (#17998)

changelog_unreleased/javascript/17998.md

@@ -0,0 +1,31 @@
+#### Improve comment handing inside if statement (#17998 by @fisker)
+
+<!-- prettier-ignore -->
+```jsx
+// Input
+if (foo) // comment
+{
+  doThing();
+} else // comment for else
+{
+  doSomethingElse();
+}
+
+// Prettier stable
+if (foo) {
+  // comment
+  doThing();
+} // comment for else
+else {
+  doSomethingElse();
+}
+
+// Prettier main
+if (foo) // comment
+{
+  doThing();
+} else // comment for else
+{
+  doSomethingElse();
+}
+```