import { getEnv } from "https://deno.land/x/udibo_react_app@0.19.0/mod.tsx";
A function that takes a string key representing an environment variable and returns its value.
If the code is running on the server, it uses the Deno.env.get function to retrieve the value of the environment variable.
Otherwise it retrieves it from the browser's app.env object. The app.env object is used for internal purposes only.