config.js

const dotenv = require('dotenv');

dotenv.config({ silent: true });

const {
  PORT = 3000,
  SLACK_BASE_URL = 'https://slack.com/api',
  DATABASE_URL,
  SLACK_VERIFICATION_TOKEN,
  SLACK_ACCESS_TOKEN,
  NODE_ENV,
  SLACK_APP_DISPLAY_NAME = 'Yellow Poll',
  SLACK_MESSAGE_BAR_COLOR = '#ffd100',
  SLACK_MESSAGE_ICON_EMOJIS = 'bar_chart',
} = process.env;

const defaults = {
  SLACK_VERIFICATION_TOKEN: null,
  SLACK_ACCESS_TOKEN: null,
};

// Alert to fill the necessary environment variables
Object.keys(defaults).forEach((key) => {
  if (!process.env[key]) {
    throw new Error(
      `Please enter a custom ${key} in .env on the root directory`
    );
  }
});

module.exports = {
  PORT,
  SLACK_BASE_URL,
  DATABASE_URL,
  SLACK_VERIFICATION_TOKEN,
  SLACK_ACCESS_TOKEN,
  NODE_ENV,
  SLACK_APP_DISPLAY_NAME,
  SLACK_MESSAGE_BAR_COLOR,
  SLACK_MESSAGE_ICON_EMOJIS,
};