babel/packages/babel-plugin-transform-es2015-parameters/test/fixtures/parameters/default-eval/expected.js

var x = "outside";

function outer() {
  var a = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : function () {
    return eval("x");
  };
  return function () {
    var x = "inside";
    return a();
  }();
}

outer();