节点JS环境变量和Heroku部署

我有一个使用dotenv包的项目将我的环境变量加载到我的NodeJS应用程序中 我使用以下行

I have a project using the dotenv package to load my environment variables in my NodeJS application I use the following line

var dotenv = require('dotenv').load({ silent: true }); 

//Example of use
username: process.env.CONVERSATION_USERNAME

我现在正计划在Heroku上部署此应用程序.但是，出于某些明显的安全原因，我不想提交.env文件.

I am now planning to deploy this application on Heroku. However, for some obvious security reasons i don't want to commit my .env file.

我是NodeJS的新手，我想知道是否有办法说如果.env文件不存在，请从Heroku加载环境变量"

I'm new to NodeJS and I would like to know if there is a way to say "If the .env file doesn't exists, load the environment variable from Heroku"

谢谢， 阿列克西