Common Type Errors

I'm having the type error __ #

Check your terminal to see if we've provided a dedicated error message for your use-case! We've encoded a few tips in the type errors.

Unbound record field reduce/Unbound record field handle #

This means you've passed self to a helper function of your render, and it used it like so: <div onClick=(self.reduce click)/>. This is because the record can't be found in the scope of the file. Just annotate it: <div onClick=(self.ReasonReact.reduce click)/>.

Something about callbacks passed to reduce (or handle) having incompatible types between them #

You've probably passed self.reduce to a helper function that uses this reduce reference twice. For complex reasons this doesn't type; you'd have to pass in the whole self to the helper.