解决：意外的令牌导出？

Question

如何解决此错误：Unexpected token export？

webpack配置：

    module: {
      loaders: [{
        test: /\.js$/,
        exclude: /(node_modules|bower_components)/,
        loader: 'babel-loader?presets[]=es2015'
      }]
    }

src文件：

import {PerspectiveCamera} from 'three/build/three.modules';