[segmentio] Pull Request #4: Emit errors when the request fails

[SegmentDestinationsBot]

Migrated from #4 by @gnandretta

I believe @cristiandouce has been talking with your support team about the details of the issues we are experiencing, but we need a mechanism to detect when a request to segment (via analytics.js) fails. The callbacks that can be provided to methods like track, page, identify and so on, don't yield any information about the status of the request.

One solution we came up with is to emit errors when the request fails and it is implemented in this pull request. Unfortunately, in order for this to actually work, yields/send-json needs to be updated. A pull request has already been sent. .