NodeJs pass parameter to callback function in 3rd party library

Question

There is some public library with code like this:

function SomeFunc(param1, param2, param3, onEnd) {
//does something
      log.ok("Finished processing: " + param1);
      onEnd();
};

Later, in my code, when I use this library I call a method with parameters

SomeFunc(value1, value2, value3, onEnd);

OnEnd is called when function finished tasks.

This is an implementation of OnEnd in my code that works fine

var onEnd = function() {
    console.log("Hello World");
};

As you can see, it works without parameters. What I want to achieve, is to pass a parameter to onEnd("Something_important") but I get an error:

TypeError: onEnd is not a function

I've tried following:

var onEnd =function(param) { }; 
onEnd("Something_important");