* - `'busy'`: Emitted when the number of workers created in the pool has reached the maximum size expected and are executing at least one task.
* - `'error'`: Emitted when an uncaught error occurs.
* - `'taskError'`: Emitted when an error occurs while executing a task.
* - `'busy'`: Emitted when the number of workers created in the pool has reached the maximum size expected and are executing at least one task.
* - `'error'`: Emitted when an uncaught error occurs.
* - `'taskError'`: Emitted when an error occurs while executing a task.