webpack打包报错ERROR in js/app.5997574802e535cd2cca.js from UglifyJs Unexpected token: punc (() [js/app.

报错信息

ERROR in js/app.5997574802e535cd2cca.js from UglifyJs
Unexpected token: punc (() [js/app.5997574802e535cd2cca.js:45,8]

Build failed with

解决方案

增加.babelrc文件

{
    "presets": [
        ["es2015", {
            "modules": false}]
    ],
    "plugins": [
    ]
}