Correct way to package library

[leonardehrenfried]

I was trying to use the newest version of this library in my project but it seems that the UMD packaging doesn't work with webpack. I've received the following error:

WARNING in ./node_modules/lehrenfried-simple-opening-hours/dist/simple-opening-hours.js 3:24-31
Critical dependency: require function is used in a way in which dependencies cannot be statically extracted

When I set the tsc packaging to commonjs it works. Not sure if that is the right settings though.

Besides, the examples work with neither packaging.