new.target.js

// Constructor function
// Not to be used as normal function
function Person(id, name) {

  // Was this called using new?
  if (!new.target)
    throw "Error: use 'new Person()'";

  this.id = id;
  this.name = name;
}

// Expect error here
let result = Person(1, "Brendan");

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Output
----------------------------------
 throw "Error: use 'new Person()'";
    ^
Error: use 'new Person()'