How to pass context to anonymous function?

There are some function, thats do something long work and its provides callback.

someFunc: function(argument, callback, context) {
  // do something long

  // call callback function
  callback(context);
}

In application I use this function

someFunc('bla-bla', function (context) {
  // do something with this scope
  context.anotherFunc();
}, this);

How to implement callback function without passing context parameter?

Need some like this:

someFunc('bla-bla', function () {
  // do something with this scope
  this.anotherFunc();
}, this);