Index: lib/Format/UnwrappedLineParser.cpp
===================================================================
--- lib/Format/UnwrappedLineParser.cpp
+++ lib/Format/UnwrappedLineParser.cpp
@@ -1526,7 +1526,8 @@
   // class A {} n, m;
   // will end up in one unwrapped line.
   // This does not apply for Java.
-  if (Style.Language == FormatStyle::LK_Java)
+  if (Style.Language == FormatStyle::LK_Java ||
+      Style.Language == FormatStyle::LK_JavaScript)
     addUnwrappedLine();
 }
 
Index: unittests/Format/FormatTestJS.cpp
===================================================================
--- unittests/Format/FormatTestJS.cpp
+++ unittests/Format/FormatTestJS.cpp
@@ -521,6 +521,8 @@
                "    return 'y';\n"
                "  }\n"
                "}");
+  verifyFormat("class X {}\n"
+               "class Y {}");
 }
 
 TEST_F(FormatTestJS, Modules) {