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
@@ -1563,9 +1563,13 @@
       parseConcept();
       return;
     case tok::kw_requires: {
-      bool ParsedClause = parseRequires();
-      if (ParsedClause)
-        return;
+      if (Style.isCpp()) {
+        bool ParsedClause = parseRequires();
+        if (ParsedClause)
+          return;
+      } else {
+        nextToken();
+      }
       break;
     }
     case tok::kw_enum:
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
@@ -323,6 +323,7 @@
   verifyFormat("var struct = 2;");
   verifyFormat("var union = 2;");
   verifyFormat("var interface = 2;");
+  verifyFormat("var requires = {};");
   verifyFormat("interface = 2;");
   verifyFormat("x = interface instanceof y;");
   verifyFormat("interface Test {\n"