Should be able to specify reaction onError at initialization

[adamabeshouse]

It's not possible to add a custom error handler to an autorun in a way that handles if the error is thrown on initialization and first run.

https://jsfiddle.net/akz7rz1p/1/

A fix would be to be able to specify the error handler at initialization of the reaction.

[mweststrate]

Love the idea. Will consider adding it to the next major, where autorun etc will receive a map with options

[adamabeshouse]

awesome, thanks!

[mweststrate]

Closing as this will be added to mobx4