Initializing databases with Bookshelf

a.js

var i = 0;

module.exports = ++i;

b.js

require('./a'); // 1
require('./a'); // 1
require('./a'); // 1

db.js

var Bookshelf = require('bookshelf');

module.exports = Bookshelf.initialize({
  client: 'pg',
  connection: {
    host: 'localhost',
    user: 'Ben',
    database: 'valet_io_auction'
  }
});

a.js and b.js are an illustration of how module caching works in Node. Once a particular module has been required, its value will be cached for any future requires in the same context, including from other files.