-- `onlineHandler` (optional) - A function that will listen for online event on each worker
-- `messageHandler` (optional) - A function that will listen for message event on each worker
-- `errorHandler` (optional) - A function that will listen for error event on each worker
-- `exitHandler` (optional) - A function that will listen for exit event on each worker
-- `startWorkers` (optional) - Start the minimum number of workers at pool creation.
- Default: `true`
+- `onlineHandler` (optional) - A function that will listen for online event on each worker.
+ Default: `() => {}`
+- `messageHandler` (optional) - A function that will listen for message event on each worker.
+ Default: `() => {}`
+- `errorHandler` (optional) - A function that will listen for error event on each worker.
+ Default: `() => {}`
+- `exitHandler` (optional) - A function that will listen for exit event on each worker.
+ Default: `() => {}`
+