面对同样的问题，这里有一个解决方案:

删除package-lock。Json从项目文件夹和NPM卸载webpack 将react-script从5降级为4.0.3 确保包锁。Json被删除/删除 使用npm Install webpack@4.44.2安装webpack 最后，使用终端运行npm install

Create React App刚刚发布了v5，现在实现了Webpack v5。这将完全打破许多库，其中包括web3作为必需的节点核心库腻子将会丢失。

为了快速解决这个问题，你可以在package.json中修改这个:

"react-scripts": "^5.0.0"

这个

"react-scripts": "4.0.3"

在这之后:

rm -r node_modules

rm package-lock.json

npm install

我在create-react-app中遇到了这个问题

"react": "^17.0.2",
"react-dom": "^17.0.2",
"react-scripts": "5.0.0",
"web-vitals": "^2.1.2"

我通过将react-scripts更改为4.0.3版本来解决这个问题。

当从webpack v4升级到v5时，我也得到了这些错误。 通过对webpack.config.js进行以下更改来解决

添加的决心。回退财产

删除节点属性

{
resolve: {
  modules: [...],
  fallback: {
    "fs": false,
    "tls": false,
    "net": false,
    "path": false,
    "zlib": false,
    "http": false,
    "https": false,
    "stream": false,
    "crypto": false,
    "crypto-browserify": require.resolve('crypto-browserify'), //if you want to use this module also don't forget npm i crypto-browserify 
  } 
},
entry: [...],
output: {...},
module: {
  rules: [...]
},
plugins: [...],
optimization: {
  minimizer: [...],
},
// node: {
//   fs: 'empty',
//   net: 'empty',
//   tls: 'empty'
// },
}

从v4升级到v5 => https://webpack.js.org/migrate/5/#clean-up-configuration

我从express导入路由器时得到这个错误 import {Router} from 'express';

修正后解决 import {Router} from '@angular/ Router ';

你需要React => v17 React脚本=> v5 webpack => v5

解决问题

1)安装

"fs": "^2.0.0",  // npm i fs
"assert": "^2.0.0",  // npm i assert
"https-browserify": "^1.0.0", // npm i https-browserify
"os": "^0.1.2", // npm i os
"os-browserify": "^0.3.0", // npm i os-browserify
"react-app-rewired": "^2.1.9", //npm i react-app-rewired
"stream-browserify": "^3.0.0", // stream-browserify
"stream-http": "^3.2.0", //stream-http

2)在根目录下创建config-override .js 图像

3)在config-override .js中添加配置

const webpack = require('webpack');
module.exports = function override(config, env) {
    config.resolve.fallback = {
        url: require.resolve('url'),
        fs: require.resolve('fs'),
        assert: require.resolve('assert'),
        crypto: require.resolve('crypto-browserify'),
        http: require.resolve('stream-http'),
        https: require.resolve('https-browserify'),
        os: require.resolve('os-browserify/browser'),
        buffer: require.resolve('buffer'),
        stream: require.resolve('stream-browserify'),
    };
    config.plugins.push(
        new webpack.ProvidePlugin({
            process: 'process/browser',
            Buffer: ['buffer', 'Buffer'],
        }),
    );

    return config;
}

3)更改packages.json

"scripts": {
  "start": "react-app-rewired start",
  "build": "react-app-rewired build",
  "test": "react-app-rewired test",
  "eject": "react-app-rewired eject"
}

问题解决了:)