Question

我收到此错误：

Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object.

尝试使用ReactDOMServer.renderToStaticMarkup时。

这是我的反应：

"use strict";
import React from 'react'

module.exports = () => {
    return (
        <div></div>
    );
};

这是我的节点服务器呈现代码：

"use strict";
const path = require('path');
const webpack = require('webpack');
const React = require('react'), ReactDOMServer = require('react-dom/server'),
DOM = React.DOM, body = DOM.body, div = DOM.div, script = DOM.script;
webpack({
    target: "node",
    entry: [
        path.resolve(__dirname, '../js', 'app.js'),
    ],
    module: {
        loaders: [
            {
                exclude: /node_modules/,
                loader: 'babel',
                test: /\.js$/,
            },
        ]
    },
    output: {filename: 'app.bundle.js', path: __dirname},
},() => {
    const App = React.createFactory(require('./app.bundle.js'));
    let html = ReactDOMServer.renderToStaticMarkup(body(null,
        div({
            id: 'root', dangerouslySetInnerHTML: {
                __html: ReactDOMServer.renderToString(App())
            }
        })
    ));
});

有没有人知道导致此错误的原因以及如何解决此问题？

提前致谢。

Answer 1

默认情况下，捆绑包与commonjs不兼容。当我在webpack docs中阅读时，您需要将libraryTarget:'commonjs2'添加到输出对象中才能执行此操作。

像这样：

output: {filename: 'app.bundle.js', path: __dirname,libraryTarget:'commonjs2'}

得到＆＃34;元素类型无效：期望一个字符串＆＃34;当尝试服务器端渲染反应时

1 个答案: