Instantiate a class name from a variable [duplicate]

I have two classes: Foo and Bar and I have a dictionary (coming from reading a JSON file) that specifies if an entry is of class Foo or class Bar

myDict = {
  "Alice": "Foo",
  "Bob": "Bar"
}

What I’m currently doing is to use a conditional to either create a Foo or a Bar instance.

let instances = [];

for (const [name, className] of Object.entries(myDict)) {
  if (className == "Foo") {
    instances.push(new Foo(name));
  } 
  else if (className == "Bar") {
    instances.push(new Bar(name));      
  }
}

However, I expect the number of class types to increase in a future, meaning that I will create new classes (eg: Baz) but I don’t want to have to modify the code of the conditional to add new else cases.

Is there a better way?