How to construct subclasses of Immutable.Record?

Question

class Event extends Immutable.Record {
  constructor(text) {
    super({text: text, timestamp: Date.now()});
  }
}

Calling new Event()

Answer 1

Immutable.Record "Creates a new Class which produces Record instances.", in other words it's a function in itself which you pass the allowed keys and returns a class you can extend;

class Event extends Immutable.Record({text:'', timestamp:''}) {
  constructor(text) {
    super({text: text, timestamp: Date.now()});
  }
}

> new Event('started').toString()
Event { "text": "started", "timestamp": 1453376445769 }