Value referenced before definition

[AFatNiBBa]

If a Proxy is inside of its target, is used a special kind of circular reference in which the value will be defined, there could be a reference to that value before it has been defined
(In this case x[2])

const a = {};
a.b = a.c = new Proxy(a, {});
console.log(eval(uneval(a)).b) // undefinded

Generated Source:

((x = {}) => (
  x[1] = {
    b: x[2]
  },
  x[1].c = x[2] = new Proxy(
    x[1],
    {}
  ),
  x[1]
))()