cp.js

var CSL = require('citeproc')

var styleAsText = <contents of style.csl>

// Load your list of references
const references = {
  item1: {
    id: 'item1',
    type: 'book',
    title: 'Stuff',
  },
}

// Create a CSL engine
var sys = {
  retrieveLocale: function (lang) {
    const locale = <contents of locale xml file>
    return locale
  },
  retrieveItem: function (id) {
      return references[id]
  }
}
const citeproc = new CSL.Engine(sys, styleAsText)

// Specify the references to cite
citeproc.updateItems(Object.keys(references))

// Generate the bibliography
var bib = citeproc.makeBibliography()
dump(bib[1].join('\n'))