Index: lib/Format/TokenAnnotator.cpp
===================================================================
--- lib/Format/TokenAnnotator.cpp
+++ lib/Format/TokenAnnotator.cpp
@@ -2158,6 +2158,10 @@
                                                 tok::r_square, tok::r_brace) ||
                                    Left.Tok.isLiteral()))
       return false;
+    // JS methods can use some keywords as names (e.g. `delete()`).
+    if (Right.is(tok::l_paren) && Line.MustBeDeclaration &&
+        Left.Tok.getIdentifierInfo())
+      return false;
     if (Left.is(tok::exclaim) && Right.is(Keywords.kw_as))
       return true; // "x! as string"
   } else if (Style.Language == FormatStyle::LK_Java) {
Index: unittests/Format/FormatTestJS.cpp
===================================================================
--- unittests/Format/FormatTestJS.cpp
+++ unittests/Format/FormatTestJS.cpp
@@ -147,6 +147,18 @@
   verifyFormat("x = interface instanceof y;");
 }
 
+TEST_F(FormatTestJS, ReservedWordsMethods) {
+  verifyFormat(
+      "class X {\n"
+      "  delete() {\n"
+      "    x();\n"
+      "  }\n"
+      "  interface() {\n"
+      "    x();\n"
+      "  }\n"
+      "}\n");
+}
+
 TEST_F(FormatTestJS, CppKeywords) {
   // Make sure we don't mess stuff up because of C++ keywords.
   verifyFormat("return operator && (aa);");