Contactually's environmental variable management CLI. It updates your local .env as well as runs the commands for your staging and production values.

yarn add --dev env-manager-cli

envManager.js

import envManager from 'env-manager-cli'

envManager({
  stagingCommand: (key, value) => `heroku config:set ${key}=${value} test`,
  productionCommand: (key, value) => `heroku config:set ${key}=${value} prod`
})

package.json

  "scripts": {
    "env:set": "node ./envManager",
  },

now running yarn env:set will result in the following prompt

• envFilePath: String Optional this is the path to your local .env file. The default is "./.env"
• stagingCommand: Function a function which accepts a key and value, and returns the staging update command. This will be logged and executed in the terminal
• productionCommand: Function a function which accepts a key and value, and returns the production update command. This will be logged and executed in the terminal