check_envs.js

function isNonEmptyString(value) {
  return typeof value === "string" && value.length > 0;
}

/**
 * If targetEnv is empty/not set, set it to the first alias that has contains a value
 * @param {string} targetEnv the name of the env that aliases should map to
 * @param {string[]} aliases aliases for targetEnv
 * @returns targetEnv's value or the first non empty alias value
 */
function aliasEnv(targetEnv, aliases) {
  targetEnv = targetEnv.toUpperCase();
  aliases = aliases.map((alias) => alias.toUpperCase());
  if (
    typeof process.env[targetEnv] === "string" &&
    process.env[targetEnv].length > 0
  ) {
    return process.env[targetEnv];
  } else {
    for (const alias of aliases) {
      const value = process.env[alias];
      if (typeof value === "string" && value.length > 0) {
        process.env[targetEnv] = value;
        return value;
      }
    }
  }
  // Nothing found, all empty
  return undefined;
}

/**
 * Check if all envs exist and print errors otherwise.
 * @param {{name: string, aliases: string[], description: string, whereToGetIt: string?}[]} envsWithDescriptions
 * @returns array of error messages
 */
function checkAllEnvsExist(envsWithDescriptions) {
  let errorMessages = [];

  for (const {
    name,
    aliases,
    description,
    whereToGetIt,
  } of envsWithDescriptions) {
    const value = aliasEnv(name, aliases);
    if (!isNonEmptyString(value)) {
      const aliasMessage =
        aliases.length > 0 ? " (Aliases: " + aliases.join(", ") + ")" : "";
      const whereToGetItText = whereToGetIt
        ? "\n└ You can request it here: " + whereToGetIt
        : "";
      const errrorMessage = `
Environment variable ${name}${aliasMessage} is not set.
└ Description: ${description}${whereToGetItText}
`;
      errorMessages.push(errrorMessage);
    }
  }
  return errorMessages;
}

module.exports.checkAllEnvsExist = checkAllEnvsExist;