I read from here that な at the end of a sentence could be used as a positive or negative imperative. https://japanese.stackexchange.com/a/33973/55298
It said that the dictionary form of a verb + な means negative imperative. And the masu stem of a verb + な means positive imperative.
How about the て form? I came across this sentence
does it means
it's very straightforward so laugh it off
it's very straightforward so don't laugh
Or does it means something else? And I wonder how can we tell which verb form other than the two mentioned above means positive or negative imperative when な is added. Thanks!