validate-env.js

require('./src/utils/logging');
const { join } = require('path');
const { config } = require('dotenv');
const { exists } = require('fs-extra');
const ValidationMessages = require('./validate-env-messages.json');

const REQUIRED_DOT_ENV_PROPS = ['TOKEN'];
function checkIfDotEnvExists() {
  const dotEnvFilePath = join(__dirname, '.env');
  return new Promise((resolve, reject) => {
    exists(dotEnvFilePath).then(
      (doesIt) =>
        doesIt ? resolve() : reject({ message: '.env file not found' })
    );
  });
}
function validateDotEnvFile() {
  return new Promise((resolve, reject) => {
    config();
    const missingProperties = [];
    REQUIRED_DOT_ENV_PROPS.forEach((p) => {
      const dotEnvProperty = process.env[p];
      if (typeof dotEnvProperty === 'undefined' || !dotEnvProperty) {
        missingProperties.push(p);
      }
    });
    const missingRecommendedProperties = Object.keys(ValidationMessages).reduce(
      (missing, current) => {
        const dotEnvProperty = process.env[current];
        if (typeof dotEnvProperty === 'undefined' || !dotEnvProperty) {
          missing.push(` - ${current}:: ${ValidationMessages[current]}`);
        }
        return missing;
      },
      []
    );
    missingProperties.length === 0
      ? resolve(
          missingRecommendedProperties.length
            ? missingRecommendedProperties
            : []
        )
      : reject({
          message: `Please add these valid properties to your .env file - ${missingProperties.join(
            ', '
          )}`,
        });
  });
}
function allGood(props) {
  if (props.length) {
    console.yellow(
      `Some of the recommended properties are not provided in .env file`
    );
    console.yellow(props.join('\n'));
  }
  console.green('All good... Attempting to spawn the bot');
}
function somethingsWrong(error) {
  console.red(`${error.message}\n`);
  // exit process with error code 1 to make sure the subsequent start task invocation is prevented
  process.exit(1);
}
checkIfDotEnvExists()
  .then(validateDotEnvFile)
  .then(allGood)
  .catch(somethingsWrong);