[platform]

react native packaging into an Android app. More specifically: the @react-native-community/cli followed by metro bundler.

Every single time I have to upgrade react-native, I have no problems with the code base,

but with these horrible 'put a js config file here', put 'node_modules' there, set environment variable this way -- kind of tools.

This is approximately equivalent in frustration, trying to build a Linux-kernel with a new network-interface driver in early 90s.

..may be even worth than that.