[zachrose]

Yes, this very much describes my experience of working on a gigantic Backbone app while using Elm at home. Work has gotten harder because I’m (rightfully) paranoid about mutation and unable to trust the (fallible) conventions of OO JavaScript.

[skosch]

Similar situation here – I've found that using Typescript and declaring (most) variables const already goes a long way, although the peace of mind still isn't quite the same.