Don't skip ChainExpression in isMemberExpression (#18652)

changelog_unreleased/typescript/18652.md

@@ -0,0 +1,22 @@
+#### Fix inconsistent formatting of class superClass (#18652 by @fisker)
+
+<!-- prettier-ignore -->
+```tsx
+// Input
+class ALongLongLongLongLongLongLongLongLongLongLongLongClassName
+  extends foo.bar.Baz {}
+class ALongLongLongLongLongLongLongLongLongLongLongLongClassName
+  extends foo.bar.Baz! {}
+
+// Prettier stable
+class ALongLongLongLongLongLongLongLongLongLongLongLongClassName
+  extends foo.bar.Baz {}
+class ALongLongLongLongLongLongLongLongLongLongLongLongClassName extends (foo
+  .bar.Baz!) {}
+
+// Prettier main
+class ALongLongLongLongLongLongLongLongLongLongLongLongClassName
+  extends foo.bar.Baz {}
+class ALongLongLongLongLongLongLongLongLongLongLongLongClassName
+  extends (foo.bar.Baz!) {}
+```