Get result of last statement in JavaScript Code

Given is a file with JavaScript-Code. For example:

1 + 1;
3 + 3;

I want to receive the value of the last expression (which is 6 in this case).

This could be achieved via

node --print "1 + 1; 3 + 3;"

But I cannot pass the code as a string because the code can contain quotes which conflict with the quotes around the code (e.g. node -p "1 + 1; aFunction("string")").

Unfortunately, node's --print parameter cannot deal with files.

Another approach would be to modify the source file. I could use the eval-Function which has the desired behaviour that eval("1 + 1; 3 + 3") returns 6. Unfortunately, I run into the same conflicts with the quotes.

I hope I could make my point clear. I'm looking forward to your answers.