Boolean

Specifies if the property is required. By default all properties are not required. Setting a property required will result in instantiation throwing if the property is omitted.

import { ObservableObject } from "can/everything";

class MyMap extends ObservableObject {
  static props = {
    propertyName: {
      type: String,
      required: true
    }
  };
}

const firstMap = new MyMap({ propertyName: "a value" }); // does not throw

const secondMap = new MyMap({}); // throws