javascript – the easiest way to assign a function call to another with an extra argument

I have a function call like :

{
.
.
.
externals: (ctx, request, callback) => externalsHandler(ctx, request, callback, ('a', 'b'))
}

as you can see, I’m calling a function inside externals and passing all of its arguments plus one array

I want to know if there is an easier way to do that.

one thing i found working is:

externals: (...args) => externalsHandler(...args, ('a', 'b'))

Is there any way to write this simpler?