clang-format: [JS/TypeScript] Support "enum" as property name.

Before:
  enum: string
  [];

After:
  enum: string[];

llvm-svn: 256546
diff --git a/clang/unittests/Format/FormatTestJS.cpp b/clang/unittests/Format/FormatTestJS.cpp
index 9bfd587..56b493d 100644
--- a/clang/unittests/Format/FormatTestJS.cpp
+++ b/clang/unittests/Format/FormatTestJS.cpp
@@ -762,6 +762,7 @@
 TEST_F(FormatTestJS, InterfaceDeclarations) {
   verifyFormat("interface I {\n"
                "  x: string;\n"
+               "  enum: string[];\n"
                "}\n"
                "var y;");
   // Ensure that state is reset after parsing the interface.