index.js

import falcor from 'falcor';
import HttpDataSource from 'falcor-http-datasource';
import _expandCache from 'falcor-expand-cache';
import _diff from 'deep-diff';

export default function(options, expandCache=_expandCache, diff=_diff) {
  const model     = options.model;
  const namespace = options.namespace || 'falcor';
  const source    = options.source    || '/model.json';

  const falcorModel = new falcor.Model({
    source: new HttpDataSource(source)
  });

  falcorModel._root.onChange = function() {
    const falcorCache   = expandCache(falcorModel.getCache());
    const falcorChanges = diff(model.tree.get([namespace]), falcorCache);
    falcorChanges.forEach(change => model.tree.set([namespace].concat(change.path), change.rhs));
  }

  return {
    init({name, controller}) {
    },
    services: {
      get(query) {
        return falcorModel.get(query)
      },
      call(functionPath, args, refPaths, thisPaths=[]) {
        return falcorModel.call(functionPath, args, refPaths, thisPaths)
      }
    }
  }
}