[TLLtchvL8KZ]

Doesn't seem to be mentioned yet but at least on my machine, it knows shellcheck is installed and as I save scripts I get red arrows at the side of "problems" and the description, for eg,

    Quotes/backslashes will be treated literally. Use an array. [SC2089]

At the bottom, I find it quite useful although I'm not sure how one would turn it off as I didn't turn it on.