The import tells you that some of the expressions in a file might be functions, but not which ones. For each definition, you have to read the entire expression to tell whether it's a function or evaluated immediately, and what its arity is. No thanks! Reading the entire file just to find out its API is no fun.

I like the direction typescript is going, where you can easily see not only the arity but the type of each parameter, without reading the function body. This is more skimmable.