how to access environment variables in functions using Dart SDK

Using appwrite version 1.4.4 and running through the documentation and sample function I am not clear how this now works

It used to be "req.variables['VARIABLE_NAME']"

Now I see

process.env. VARIABLE_NAME Platform.environment['VARIABLE_NAME'] ??

TL;DR

The user is asking how to access environment variables in functions using Dart SDK. They mention trying to use "platform" but it wasn't recognized and will try again later. The user is using appwrite version 1.4.4 and is unsure how to access environment variables with the new version. The old way was "req.variables['VARIABLE_NAME']" but now it seems to be "process.env.VARIABLE_NAME" or "Platform.environment['VARIABLE_NAME']".