使用 express、create-react-app 和 babel-node 时我得到 "React not defined"

Question

我只是想通过 react 和 create-react-app 启用服务器端渲染。

我写了一个 server/index.js 文件，它应该 return 一个简单的反应组件作为一个字符串。

//require('import-export');
//require('babel-register')({ ignore: /\/(build|node_modules)\//, presets: ['react-app', 'es2015', 'react'] });
const express = require('express');
const morgan = require('morgan');
const path = require('path');
const fs = require('fs');
const index = require('./index.js');
const react = require('react');
const reactServerDom = require('react-dom/server');
const renderToString = reactServerDom.renderToString;
const ourComponent = require('../src/App.js');
const app = express();

// Setup logger
app.use(morgan(':remote-addr - :remote-user [:date[clf]] ":method :url HTTP/:http-version" :status :res[content-length] :response-time ms'));

// Serve static assets - NEEDS TO BE ACTIVATED LATER WHEN RENDERTOSTRING WORKS!
//app.use(express.static(path.resolve(__dirname, '..', 'build')));

app.get('/', (req, res) => {
  const filePath = path.resolve(__dirname, '..', 'build', 'index.html');
  let result = '';
  fs.readFile(filePath, 'utf8', function (err, data) {
    if (err) {
      return console.log(err);
    }
    const ReactApp = renderToString(react.createElement(ourComponent));
    result = data.replace('{{SSR}}', ReactApp);
    res.send(result);
  });
});

const port = 9007;

app.listen(port, () => {
  console.log(`App listening on port ${ port }`);
});

module.exports = app;

应该渲染的组件就是大家从create-react-app得到的sample组件：

import React, { Component } from 'react';
import logo from './logo.svg';
import './App.css';

class App extends Component {
  render() {
    return (
      <div className="App">
        <div className="App-header">
          <img src={logo} className="App-logo" alt="logo" />
          <h2>Welcome to React</h2>
        </div>
        <p className="App-intro">
          To get started, edit <code>src/App.js</code> and save to reload.
        </p>
      </div>
    );
  }
}

export default App;

在我的 package.json 中，我有以下命令使用命令 yarn server 或 npm [=41= 使用 babel-node 启动服务器] 服务器:

...
  "scripts": {
    "start": "react-scripts start",
    "server": "NODE_ENV=development babel-node --presets=es2015,react server/index.js",
    "build": "react-scripts build",
    "test": "react-scripts test --env=jsdom",
    "eject": "react-scripts eject"
  }
...

但我仍然收到以下错误：

$ NODE_ENV=development babel-node --presets=es2015,react server/index.js
/home/sonnenfeld/ssr-render/src/logo.svg:4
React.createElement(
^

ReferenceError: React is not defined

如果我从组件中删除 svg，我会收到另一个错误：

SyntaxError: /home/sonnenfeld/ssr-render/src/App.css: Unexpected token (1:0)
> 1 | .App {
    | ^
  2 |   text-align: center;
  3 | }
  4 |

我已经用babel-register尝试了babel hook，但是还是没有成功。

当使用带有 express 的 create-react-app 时，将我的 server.js 和所有依赖项转译为 vanilla javascript 的好方法是什么？

Answer 1

服务器端渲染真的很难。所以我完全切换到 next-js。

样式化组件的问题已通过官方解决方法解决https://www.styled-components.com/docs/advanced#server-side-rendering

使用 express、create-react-app 和 babel-node 时我得到 "React not defined"

I get "React not defined" when using express, create-react-app and babel-node

express

reactjs

babel-register

babel-node

create-react-app