JavaScript New Function Only Has Access to Global Scope

new-function-no-local-scope.js

// The following code proves that functions created in `new Function()` cannot access local scope

// See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/Function for more details

let userDefinedFunction = function () {
  const foo = 'bar';
  const fn = () => { console.log(foo) };
  fn(); // This succeeds and prints 'bar'

  return new Function('props', `const f = ${fn.toString()}; return f(props);`) 
}
let fun = userDefinedFunction();

fun(); // Fails as new Function cannot access foo