Add error func to schedule

[jorganisak]

crownheightsaid/mutual-aid-app#90

[mjmaurer]

thanks for the PR! could you add a little more context to why this is needed? does the current errfunc not work?

[jorganisak]

Sure!

The current errFunc works as expected without these changes for catching problems with polling. I added the passing of the errFunc to the schedule function to catch any problems that might happen in the function passed by the caller of pollWithInterval.

If an error happens in https://github.com/crownheightsaid/mutual-aid-app/blob/master/src/workers/airtable-sync/worker.js#L51, or any off the promises that are called after polling happens, it fails quietly and continues to poll.

Writing it out makes me think this PR could be a nice-to-have rather than something needed to deploy the code in crownheightsaid/mutual-aid-app#108

Or maybe we don't need it at all!

[mjmaurer]

I'd like to see if its possible to fix crownheightsaid/mutual-aid-app#108 without these changes. I think the current API before and after this change would be the same, but it's possible I'm missing something!

[jorganisak]

That sounds right to me 👍