* fix: server side error handling
* fix: push only unknown 500 errors to sentry
* fix: use in-house onerror in favor of errorHandling middleware
* fix: split error template into dev and prod envs
* fix: check Error instance
* fix: error routes in test env
* fix: review comments
* Remove koa-onerror
Co-authored-by: Tom Moor <tom.moor@gmail.com>
This PR moves the entire project to Typescript. Due to the ~1000 ignores this will lead to a messy codebase for a while, but the churn is worth it – all of those ignore comments are places that were never type-safe previously.
closes#1282
