Modifications in the Blog for debugging shiny app

I am reading the blog for debugging shinyapp, and I see there are a few things that could be helpful.

I am a new user and feel that there are always new users who could use some additional details.
I will start listing them here as I see them

  1. shiny:: runApp(display.mode = "showcase")
    I am not sure how to run this, should I just type this in the console? When I type this in console, it runs the app but I do not see the code highlighted. what to do?

  2. Adding a file named "DESCRIPTION" in the app directory
    what should be the extension of this file ?

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