I am trying to use a template header from file but due to the fact that it trims when loading from file it is removing the trailing new lines which I require due to microsoft/TypeScript#12307 (comment). I am also unable to specify a newline going the route with a single argument.

It would be good to either not trim the comment when loading from a file (though this would be a major breaking change as some users may depend on it) or maybe support adding newlines when using the template file?