When running a prod build, getting: Uncaught DOMException: Failed to execute 'createElement' on 'Document': The tag name provided ('[object Object]') is not a valid name.

[maxnachlinger]

First - preact and preact-compat are both awesome - my users really appreciate the smaller bundle sizes and the API enhancements preact brings are great! I also realise this very exception has been addressed here .

Unfortunately, I'm only seeing the above exception in a production build, which kinda exempts me from using preact/debug :) At any rate, my issue stems from using preact with preact-compat and react-day-picker. I've created a simple completely-non-fancy repo here https://github.com/maxnachlinger/daypicker-preact-issue to reproduce this issue.

In dev mode, everything is dazzling, but when I build for production I get a curious:

Uncaught DOMException: Failed to execute 'createElement' on 'Document': The tag name provided ('[object Object]') is not a valid name. at HTMLDocument.createElement (:1:1554)

error.

[jessicabyrne]

We're seeing this as well, it works in dev mode but in production preact isn't playing nicely with the datepicker (our preferred datepicker because of its smaller bundle size!)

[maxnachlinger]

Looks like the research in https://github.com/developit/preact-compat/issues/484 fixed my issue as well :)