mongoose-helpers-setup-db/examples/express/config/db/index.js

returns a function that will return a mongoose connection promise when called

'use strict'

/**
 * module dependencies
 */
var fileExists = require( 'file-exists' )
var path = require( 'path' )

/**
 * module variables
 */
var config_path = path.join( __dirname, 'config.json' )

if ( !fileExists.sync( config_path ) ) {
  throw new Error(
    'config {} ( %path ) does not exist. copy the example that’s in the same directory without the .example suffix'
      .replace( '%path', config_path )
  )
}

module.exports = require( './config.json' )