diff --git a/clang/lib/Format/UnwrappedLineParser.cpp b/clang/lib/Format/UnwrappedLineParser.cpp
--- a/clang/lib/Format/UnwrappedLineParser.cpp
+++ b/clang/lib/Format/UnwrappedLineParser.cpp
@@ -1015,9 +1015,15 @@
     return;
   case tok::kw_for:
   case tok::kw_while:
+    if (Style.Language == FormatStyle::LK_JavaScript && Line->MustBeDeclaration)
+      // field/method declaration.
+      break;
     parseForOrWhileLoop();
     return;
   case tok::kw_do:
+    if (Style.Language == FormatStyle::LK_JavaScript && Line->MustBeDeclaration)
+      // field/method declaration.
+      break;
     parseDoWhile();
     return;
   case tok::kw_switch:
diff --git a/clang/unittests/Format/FormatTestJS.cpp b/clang/unittests/Format/FormatTestJS.cpp
--- a/clang/unittests/Format/FormatTestJS.cpp
+++ b/clang/unittests/Format/FormatTestJS.cpp
@@ -343,6 +343,14 @@
                "  x: 'x'\n"
                "};",
                "const Axis = {for: 'for', x:   'x'};");
+  verifyFormat("class KeywordNamedMethods {\n"
+               "  do() {\n"
+               "  }\n"
+               "  for() {\n"
+               "  }\n"
+               "  while() {\n"
+               "  }\n"
+               "}\n");
 }
 
 TEST_F(FormatTestJS, ReservedWordsMethods) {