Current Behavior

babel-plugin-dev-expression replaces all instances of __DEV__ with process.env.NODE_ENV !== 'production'. As the process variable may not be available outside of nodejs, it introduces an incompatibility with modern browsers.

Suggested solution(s)

There are several different ways we could approach fixing this:

1. Add an option to tsdx.config.js that allows users to opt out of babel-plugin-dev-expression, or replace with a different plugin.
2. Replace babel-plugin-dev-expression with another plugin that works in both browser and nodejs environments. I made a quick fork of babel-plugin-dev-expression that does just that.

Additional context

Affects these issues:
immer
an open issue in
babel-plugin-dev-expression