Events that can currently be listened to:
'full': Emitted when the pool is dynamic and the number of workers created has reached the maximum size expected.'ready': Emitted when the number of workers created in the pool has reached the maximum size expected and are ready.'ready': Emitted when the number of workers created in the pool has reached the minimum size expected and are ready.'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.Protected Readonly fileProtected Readonly numberProtected Readonly optsProtected promiseProtected workerReadonly workerProtected fullProtected maxProtected minPrivate readyPrivate startingProtected typePrivate utilizationProtected workerProtected afterProtected beforeProtected checkProtected createProtected createProtected createProtected destroyProtected internalProtected isProtected sendProtected setupProtected worker