Generate commands for setting Heroku ENV from .env

create-heroku-env-update.js

// given .env file
// generate heroku env set commands to be run in heroku cli
// usage: node scripts/create-heroku-env-update.js .env app1,app2

const fs = require("fs");

const envFile = process.argv[2];
const env = fs.readFileSync(envFile, "utf8");

const envVars = env
  .split("\n")
  .filter((line) => line.length > 0 && !line.startsWith("#")) // remove empty lines and comments
  .map((line) => line.split("#")[0]); // remove in-line comments

if (envVars.length === 0) {
  console.error("No env vars found");
  process.exit(0);
}

// support multiple apps
const apps = process.argv[3] ? process.argv[3].split(",") : [];
if (apps.length === 0) {
  console.error("No apps specified");
  process.exit(0);
}

apps.forEach((app) => {
  console.log(`\n# ${app}`);
  envVars.forEach((envVar) => {
    console.log(`heroku config:set --app ${app} ${envVar} `);
  });
});