A small script to check missing envs from application.

check-envs.js

/**
 * Tool to check all the environment files for the missing variables.
 credit: Marko Markovich
 */
const fs = require('fs');
const dotenv = require('dotenv');
const glob = require('glob');
// eslint-disable-next-line import/no-extraneous-dependencies
const chalk = require('chalk');

const envFiles = glob.sync('.env*');
const maxLen = envFiles.reduce((acc, cur) => Math.max(acc, cur.length), 0);

const envs = envFiles.map(f => {
  const config = dotenv.parse(fs.readFileSync(f));
  const keys = Object.keys(config);
  return { file: f, keys, config };
});

const allKeys = envs
  .reduce((acc, cur) => acc.concat(cur.keys.filter(f => !acc.includes(f))), [])
  .sort((a, b) => (a.toUpperCase() < b.toUpperCase() ? -1 : 1));

envs.forEach(env => {
  console.log(
    chalk.green.bold(`
Checking ${env.file} ... `),
  );
  allKeys.forEach(key => {
    if (!env.keys.includes(key)) {
      const foundIn = envs
        .map(env2 =>
          env2.keys.includes(key)
            ? `${env2.file.padEnd(maxLen, ' ')}: ${env2.config[key]}`
            : false,
        )
        .filter(ff => ff);
      console.log(`
${chalk.yellow(env.file)} is missing ${chalk.red(key)} found in`);
      foundIn.forEach(found => console.log(`     ${found}`));
    }
  });
});