A synchronous start function returns void or a CleanupFn. It runs immediately and gets passed the newly created job as its first argument.
The type the job will end up returning
The type of this the function accepts, if using two-argument start(). Defaults to void (for one-argument start()).
this
A synchronous start function returns void or a CleanupFn. It runs immediately and gets passed the newly created job as its first argument.