webpack handlebars 出现警告 require.extensions is not supported by webpack. Use a loader instead.

警告信息：

WARNING in ./node_modules/handlebars/lib/index.js 22:38-56
require.extensions is not supported by webpack. Use a loader instead.
 @ ./src/app.js 5:0-41 6:15-33

WARNING in ./node_modules/handlebars/lib/index.js 23:2-20
require.extensions is not supported by webpack. Use a loader instead.
 @ ./src/app.js 5:0-41 6:15-33

WARNING in ./node_modules/handlebars/lib/index.js 24:2-20
require.extensions is not supported by webpack. Use a loader instead.
 @ ./src/app.js 5:0-41 6:15-33

解决方法：

在webpack.config.js的配置中，增加以下修改信息：

resolve: {
      alias: {
        'handlebars': 'handlebars/dist/handlebars.js'
      }
    }