flags--;

src/compiler/commandLineParser.ts

@@ -56,14 +56,6 @@ namespace ts {
             category: Diagnostics.Command_line_Options,
             description: Diagnostics.Stylize_errors_and_messages_using_color_and_context_experimental
         },
-        {
-            name: "diagnosticStyle",
-            type: createMapFromTemplate({
-                auto: DiagnosticStyle.Auto,
-                pretty: DiagnosticStyle.Pretty,
-                simple: DiagnosticStyle.Simple,
-            }),
-        },
         {
             name: "preserveWatchOutput",
             type: "boolean",