把手js未加载require js

Question

我正在尝试将Handlebars.js与require.js一起升级。当我使用最新的handlebars.js（handlebars-v4.0.12）时，require（版本2.3.6）未加载Handlebars。

require.config({
 paths : {
    jquery : '../assets/js/libs/jquery-3.3.1.min',
    underscore : '../assets/js/libs/underscore-min',
    backbone : '../assets/js/libs/backbone-min',
    handlebars : '../assets/js/libs/handlebars-v4.0.12',
},
shim : {
    'backbone' : {
        deps : [ 'underscore', 'jquery' ],
        exports : 'Backbone'
    },
    'underscore' : {
        exports : '_'
    },
    'handlebars' : {
        exports : 'Handlebars'
    },
},
});