Sometimes you have to use other values in a variable when your application is in production as if when you are debugging it.
For example you have to use another web service URL.
Here is how can do it:
var webApiUrl;
if (process.env.NODE_ENV === "production") {
// use in production
webApiUrl = "http://myapp.online/awesome-app/api";
}
else {
// use on debugging
webApiUrl = "/api";
}
If you do it like me and use Webpack, you can start the debug mode with webpack -d and the production mode with webpack -p.