/**
* @module Checks for required environment variables and terminates the process if they are missing.
*/
const dotenvVariables = [
  'NODE_ENV',
  'PORT',
  'SERVICE_NAME'
];
const missingDotenvVariables = [];

dotenvVariables.forEach(variable => {
  if (!process.env[variable]) {
    missingDotenvVariables.push(`${variable}`);
  }
});

if (missingDotenvVariables.length) {
  console.error(`Following dotenv variables are missing: ${missingDotenvVariables}`);
  process.exit(-1);
}