Method emitChangedEvent

packages/context/src/binding.ts:638–641

* Emit a `changed` event * @param operation - Operation that makes changes

(operation: string)

   * @param operation - Operation that makes changes
   */
  private emitChangedEvent(operation: string) {
    const event: BindingEvent = {binding: this, operation, type: 'changed'};
    this.emit('changed', event);
  }

  /**
   * Tag the binding with names or name/value objects. A tag has a name and