babel-plugin-transform-inline-environment-variables does not seem to work with react-native

As the title says, babel-plugin-transform-inline-environment-variables doesn't seem to work with react-native. I'm not sure if it is supposed to work? My react-native version is: 0.48.2

The process.env.somevar is undefined. Do I need to clear some babel cache or something to get this working?

Start by reproducing the reported process.env.somevar result with React Native 0.48.2 and babel-plugin-transform-inline-environment-variables, checking the Babel configuration and cache behavior described in the issue. Done means determining whether the plugin is supported in this setup and documenting or fixing the cause so the variable is no longer undefined.

Written by the indexing model from the issue text.