Redundant node script to check envvars are set correctly.

check-envvars.js

const fs = require('fs');
const path = require('path');
const dotenv = require('dotenv');
const chalk = require('chalk');

/**
 * Parse env file into object.
 *
 * @param {string} path - Absolute path to env file.
 * @returns {object} - Object containing all env vars from file.
 */
const parseFile = path => {
  const content = fs.readFileSync(path);

  return dotenv.parse(content);
};

/**
 * Check that all envvars are defined.
 *
 * @param {string} reference - The absolute path to the reference env file.
 * @param {string} actual - The absolute path to the actual env file.
 */
const checkEnvvars = (reference, actual) => {
  // Throw if .env doesn't exist
  if (!fs.existsSync(actual)) {
    console.log(chalk.red(`${actual} does not exist`));
    process.exit(1);
  }

  const requiredVars = Object.keys(parseFile(reference));
  const actualVars = parseFile(actual);

  const missingVars = requiredVars.filter(varName => !actualVars[varName]);

  if (missingVars.length > 0) {
    console.log(
      chalk.red(
        `Missing the following vars in ${path.basename(actual)}: ${missingVars}`
      )
    );

    process.exit(1);
  }
};

checkEnvvars(
  path.join(__dirname, '..', '.env.sample'),
  path.join(__dirname, '..', '.env')
);