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Cannot read property '$vm' of undefined

See original GitHub issue

code like these:

const Vue = require('vue');
const VueRouter = require('vue-router');
const App = require('./app.vue');

Vue.use(VueRouter);
Vue.use(VueResource);
let app = Vue.extend(App);

Vue.http.post( '/url').then((res)=> {}, (err)=> {});

the webpack loader config like this:

  loaders: [
      {
        test: /\.vue$/, loader: 'vue-loader'
      },
      {
        test: /\.js$/, loader: 'babel-loader'
      }
    ]

babel config: { "presets": ["es2015","stage-2"] }

and then the error:** Uncaught TypeError: Cannot read property ‘$vm’ of undefined**

error code part:

function Http(url, options) {

        var client = Client,
            request,
            promise;

        Http.interceptors.forEach(function (handler) {
            client = interceptor(handler, this.$vm)(client);
        }, this);

        options = _.isObject(url) ? url : _.extend({ url: url }, options);
        request = _.merge({}, Http.options, this.$options, options);
        promise = client(request).bind(this.$vm).then(function (response) {

            return response.ok ? response : Promise.reject(response);
        }, function (response) {

            if (response instanceof Error) {
                _.error(response);
            }

            return Promise.reject(response);
        });

        if (request.success) {
            promise.success(request.success);
        }

        if (request.error) {
            promise.error(request.error);
        }

        return promise;
    }