Sails.js log transport depend on environment

I have a Sails.js project that I would like to add LogEntries support for event logging. However I would like to use LogEntries only in some environments.

For example, in development I don't want to fill the logs with development garbage.

// config/log.js

var logentries = require('le_node');
var log = (sails.config.environment === 'development') ? sails.log : logentries.logger({
  token: 'YOUR_TOKEN'
});

module.exports.log = {
  log: {
    custom: log
  }
}

But with this I get an error that the sails is not defined. This is because sails object is not available in configuration files such as config/log.js. So how can use a custom log transport depending on the environment in this case?

In the end what seems correct was not modify the config/log.js file directly but to modify the environment configuration file:

// config/env/production.js

var logentries = require('le_node');
var log = logentries.logger({
  token: 'YOUR_TOKEN'
});

module.exports.log = {
  log: {
    custom: log
  }
}

This way only the production environment will have the custom logging.