How does your code make use of eval()? If you're trying to evaluate strings one way I've been able to refactor eval() out of my code has been by using new Function() with a string that includes return plus whatever you're trying to evaluate. Consider this test:

var string = 'innerWidth * 2'

var result1 = eval(string)

var result2 = new Function('return ' + string)

console.log(result1)
console.log(result2())

The result of both should be the same. Normally 'innerWidth * 2' is just a string and would be handled as text, but when you run it through eval(string) or new Function('return ' + string) it should print a number equal to 2x your browser's width in the console.

Maybe using a trick like this can help you refactor eval() out of your code :D