data_folder.js

var path = require('path');
var fs = require('fs');

var globSync = require('glob').sync;
var yaml = require('js-yaml');

module.exports = function(folder) {
  var files = globSync(path.join(folder, '**/*.yaml'));

  var data = {};

  files.forEach(function(filename) {
    var dataKey = path.basename(filename, path.extname(filename));

    if ( data[dataKey] ) {
      throw new Error('Attempted to add key ' + dataKey + ' to data hash, but that key already exists.');
    }

    var content = fs.readFileSync(filename, {encoding: 'utf8'});
    data[dataKey] = yaml.safeLoad(content);
  });

  return data;
};