请指教：webpack 打包 node.js 写的服务程序后，运行报错，找不到‘./streams’

[dpbug_cn]

用node.js + koa2 编写了服务器代码，运行成功，与前端调试成功，准备用webpack打包后上线。入口文件为app.js打包生成文件为index.js，运行生成后的index.js（命令行方式：node index.js），提示错误如下：

webpack://myserver/./node_modules/raw-body/node_modules/iconv-lite/lib/index.js?:144
        __webpack_require__(/*! ./streams */ "?0f43")(iconv);
                                                     ^

TypeError: __webpack_require__(...) is not a function
    at eval (webpack://myserver/./node_modules/raw-body/node_modules/iconv-lite/lib/index.js?:144:54)
    at Object../node_modules/raw-body/node_modules/iconv-lite/lib/index.js (E:\myserver\dist\index.js:5089:1)
    at __webpack_require__ (E:\myserver\dist\index.js:8730:42)
    at eval (webpack://myserver/./node_modules/raw-body/index.js?:17:13)
    at Object../node_modules/raw-body/index.js (E:\myserver\dist\index.js:4968:1)
    at __webpack_require__ (E:\myserver\dist\index.js:8730:42)
    at eval (webpack://myserver/./node_modules/co-body/lib/json.js?:7:13)
    at Object../node_modules/co-body/lib/json.js (E:\myserver\dist\index.js:1526:1)
    at __webpack_require__ (E:\myserver\dist\index.js:8730:42)
    at eval (webpack://myserver/./node_modules/co-body/lib/any.js?:8:14)

webpack打包过程中有3个warning，均为“require(变量)”导致（Critical dependency: the request of a dependency is an expression），也没再管它，反正生成了index.js文件。提示缺少的npm包均已安装，上述的streams包也存在于node_modules目录下，不知道该怎么解决了，请各位大神不吝指教，谢谢！！！

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