Reactjs react服务器端渲染babel配置

我正在尝试服务器渲染react应用程序，我使用预设环境配置了babel，以允许使用导入语句，但它似乎不起作用，当我启动服务器时，出现以下错误：

SyntaxError:无法在模块外使用导入语句

package.json：

"babel": {
    "presets": [
      "react",
      "env",
      "stage-2"
    ]
  }, 

"devDependencies": {
    "babel-eslint": "^7.2.3",
    "eslint": "^3.19.0",
    "eslint-plugin-react": "^6.10.3",
    "jest": "^19.0.2"
  },
  "dependencies": {
    "babel-cli": "^6.24.1",
    "babel-loader": "^7.0.0",
    "babel-polyfill": "^6.23.0",
    "babel-preset-env": "^1.4.0",
    "babel-preset-react": "^6.24.1",
    "babel-preset-stage-2": "^6.24.1",
    "ejs": "^2.5.6",
    "express": "^4.15.2",
    "pm2": "^2.4.6",
    "react": "^15.5.4",
    "react-dom": "^15.5.4",
    "webpack": "^2.5.0"

server.js：

app.use("/", (req,res)=>{
  const initialContent = serverRender();
  res.render("index",{initialContent}); 
});

serverRender.js：

import React from "react";
import ReactDOMServer from  "react-dom/server";
import App from "./components/app";

const serverRender =()=>{
  return ReactDOMServer.renderToString(<App/>);
};

export default serverRender;

从“React”导入React；
从“react dom/server”导入ReactDOMServer；
从“/components/App”导入应用程序；
const serverRender=（）=>{
返回ReactDOMServer.renderToString（）；
};
导出默认服务器渲染；

我正在服务器端使用babel。我的包中有那些与babel相关的包

"scripts": {  
    "babel-node": "babel-node ",     
    "start": "nodemon --exec npm run babel-node -- ./app.js",
  },

  "devDependencies": {
    "babel-polyfill": "^6.26.0",
    "babel-cli": "^6.26.0",
    "babel-eslint": "^8.2.2",
    "babel-plugin-transform-runtime": "^6.23.0",
    "babel-preset-env": "^1.7.0",
    "babel-preset-latest": "^6.24.1",
    "babel-register": "^6.26.0",
  }

对于预设，我创建了.babelrc文件

{
  "presets": ["env"],

  "plugins": [
    [
      "transform-runtime",
      {
        "polyfill": false,
        "regenerator": true
      }
    ],   
  ]
 }

希望能有帮助