code: function envVars(config) {
    const configuration = Object.assign({}, config);
    if (process.env.AMQP_URL && !configuration.host) {
      configuration.host = process.env.AMQP_URL;
    }
  
    if (process.env.LOCAL_QUEUE && !configuration.consumerSuffix) {
      configuration.consumerSuffix = process.env.LOCAL_QUEUE;
    }
  
    if (process.env.AMQP_DEBUG && !configuration.transport) {
      configuration.transport = console;
    }
  
    return configuration;
  }
docs: deprecated env vars to configure the module