how to differentiate two variables with same name?

[scil]

there are two variables named n. how could I differentiate them?

function (e, t, n) {  // n

    function b(e, t, n) {  // n
        return n
    }

  }

[marijnh]

You'll have to resolve the scopes yourself, or use some library that does that. Acorn doesn't have that functionality.