office-addin-debugging. This starts up an Office add-in web app configured for debugging. By default it starts up a web server with the webpack serve --mode development command.webpack serve --mode development --config webpack.config.ie11.js command. Now the office-addin-debugging package does have a --web-server parameter where you are supposed to be able to pass a command that it will use instead of the default.web-server parameter, but this doesn't work. When I run this script I get the error:--options as an invalid parameter of the office-addin-debugging package and not part of the command line I wish to pass to the dev-server parameter.