我正在使用craco的create-react-app，在升级到webpack 5时遇到了以下错误:

“缓冲”

Module not found: Error: Can't resolve 'buffer' in '/Users/therightstuff/my-project/node_modules/safe-buffer'

BREAKING CHANGE: webpack < 5 used to include polyfills for node.js core modules by default.
This is no longer the case. Verify if you need this module and configure a polyfill for it.

If you want to include a polyfill, you need to:
    - add a fallback 'resolve.fallback: { "buffer": require.resolve("buffer/") }'
    - install 'buffer'
If you don't want to include a polyfill, you can use an empty module like this:
    resolve.fallback: { "buffer": false }

这个问题通过安装npm install -D buffer来解决。

'fs'

Module not found: Error: Can't resolve 'fs' in '/Users/therightstuff/my-project/node_modules/line-navigator'

这个问题通过在craco配置craco.config.js中设置webpack回退来解决:

module.exports = {
    style: {
        postcssOptions: {
            plugins: [
            require('tailwindcss'),
            require('autoprefixer'),
            ],
        },
    },
    webpack: {
        configure: (webpackConfig, { env, paths }) => {
            // eslint-disable-next-line no-param-reassign
            webpackConfig.resolve.fallback = {
                fs: false,
            };
            return webpackConfig;
        },
    },
}

我想这里的大部分答案都能解决你的问题。然而，如果你的节点开发不需要Polyfills，那么我建议在Webpack模块配置中使用target: 'node'。这帮我解决了这个问题。

这里有一些关于答案的文档:https://webpack.js.org/concepts/targets/

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

我喜欢把事情简单化，在这里之前不需要运行npm run-script eject，所以我降级回react-scripts@4.0.3而不是5.0.0 到目前为止，Webpack仍然没有解决这个问题

可悲的是，因为这包括一堆退役的包裹。

我的环境是这样的:

React => v17 React脚本=> v5 Webpack => v5

要解决这个问题，请遵循下面的说明

1-安装以下软件包

yarn add fs assert https-browserify os os-browserify stream-browserify stream-http react-app-rewired

2-在项目根目录下package.json旁边创建config-coverrides.js

添加以下代码:

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-像下面这样修改packages.js

"脚本":{ “start”:“react-app-rewired start”， “build”:“react-app-rewired build”， “test”:“react-app-rewired test” "eject": "react-app-rewired eject" }，

我正在使用craco的create-react-app，在升级到webpack 5时遇到了以下错误:

“缓冲”

Module not found: Error: Can't resolve 'buffer' in '/Users/therightstuff/my-project/node_modules/safe-buffer'

BREAKING CHANGE: webpack < 5 used to include polyfills for node.js core modules by default.
This is no longer the case. Verify if you need this module and configure a polyfill for it.

If you want to include a polyfill, you need to:
    - add a fallback 'resolve.fallback: { "buffer": require.resolve("buffer/") }'
    - install 'buffer'
If you don't want to include a polyfill, you can use an empty module like this:
    resolve.fallback: { "buffer": false }

这个问题通过安装npm install -D buffer来解决。

'fs'

Module not found: Error: Can't resolve 'fs' in '/Users/therightstuff/my-project/node_modules/line-navigator'

这个问题通过在craco配置craco.config.js中设置webpack回退来解决:

module.exports = {
    style: {
        postcssOptions: {
            plugins: [
            require('tailwindcss'),
            require('autoprefixer'),
            ],
        },
    },
    webpack: {
        configure: (webpackConfig, { env, paths }) => {
            // eslint-disable-next-line no-param-reassign
            webpackConfig.resolve.fallback = {
                fs: false,
            };
            return webpackConfig;
        },
    },
}