Example ember-loader configuration to add handlebar helper loading.

helper-initializer.js

// src/initializers/helper.js
exports.name = 'helper';
exports.initialize = function(container, app) {
  Object.keys(app.HELPERS).forEach(function(key) {
    Ember.Handlerbars.helper(key.replace(/\//g, '-'), app.HELPERS[key]);
  });
};

webpack.config.js

module.exports = {
  ember: {
    // typeOrder currently has to specify all the types you want to include in
    // your application automatically.
    typeOrder: [
      'component',
      'model',
      'template',
      'initializer',
      'helper',
      'router',
      'controller',
      'route',
      'view',
      'style',
      'css',
      'less',
      'sass',
      'stylus'
    ],

    types: {
      helper: {
        store: function(params) {
          var match = /^helpers\/(.*)$|^(.*)[-_/]helper$/.exec(params.name);
          if (match) {
            module.HELPERS = module.HELPERS || {};
            module.HELPERS[match[1] || match[2]] = params.fullpath;
            return module;
          }
        },

        extend: function(merged, auto, manual) {
          merged.HELPERS = auto.HELPERS || {};
          return Ember.$.extend(merged.HELPERS, auto.HELPERS, manual.HELPERS);
        },
      },
    },
  },
};