class ObservableObjecttype

type ObservableObject​.Listener

Type definition for a callback, or set of callbacks that can be passed to the ObservableObject.listen method.

type Listener<T extends ObservableObject> =
  | ((this: T, event: ObservableEvent) => Promise<void> | void)
  | {
      handler?: (object: T, event: ObservableEvent) => Promise<void> | void;
      unlinked?: (object: T) => void;
      init?: (object: T, stop: () => void) => void;
    };

Notes

• If a single function is provided, it will be called for all events emitted by the object.
• If an object is provided, the handler function will be called for all events, and the unlinked function will be called when the object is unlinked.
• The init function is called immediately, with the object and a callback to remove the listener.

Instance members

• handler
  A function that will be called for all events emitted by the object.
• unlinked
  A function that will be called when the object is unlinked.
• init
  A function that is called immediately, with both the object and a callback to remove the listener.

Related

• class ObservableObject
  The base class of all observable objects, which can be placed into a tree structure to enable event handling and data binding.