How to document a list of string as parameter

[guoyunhe]

Should it be string[] or list(string) or anything else?

/// @param {string[]} $args - list of strings
@mixin join($args...) {
  // ...
}

[KittyGiraudel]

As far as I can remember, there is no way to type a list, so it would be @param {arglist} $args in your case.