i tried to Polyfill modules in webpack 5 but not working (Reactjs)-CodePudding

Hi guys am a newbie in React when i start my project i get the Wepback V5 Error Message

Resolve updated : https://github.com/facebook/create-react-app/issues/11756#issuecomment-1001162736

This What am using!

Os: Win11
Node : v16
React:v17
React-script : v5
Webpack:v5

This Error Message Contains

Crypto
Http
Https
Stream

Error Output

Compiled with problems:X

ERROR in ./node_modules/eth-lib/lib/bytes.js 9:193-227

Module not found: Error: Can't resolve 'crypto' in 'C:\Users\PC\Desktop\Portfolio\portfolio_app\node_modules\eth-lib\lib'

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


ERROR in ./node_modules/web3-eth-accounts/lib/index.js 31:74-91

Module not found: Error: Can't resolve 'crypto' in 'C:\Users\PC\Desktop\Portfolio\portfolio_app\node_modules\web3-eth-accounts\lib'

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


ERROR in ./node_modules/web3-eth-accounts/node_modules/eth-lib/lib/bytes.js 7:193-227

Module not found: Error: Can't resolve 'crypto' in 'C:\Users\PC\Desktop\Portfolio\portfolio_app\node_modules\web3-eth-accounts\node_modules\eth-lib\lib'

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

Image Contain Output

Webpack5 Error Message

CodePudding user response：

i resolve this errors but my app not render. If you interesting to clear this errors you can paste code right into your-project/node_modules/react-scripts/config/webpack.config.js but this chages can be overwritten after rebuilding your app. Find in module.exports object resolve and write fallback,in your case it's "crypto": require.resolve("crypto-browserify") . And install dependency npm install crypto-browserify.

resolve: {
//   fallback: {
//     "fs": false,
//     "tls": false,
//     "net": false,
//     "http": require.resolve("stream-http"),
//     "https": false,
//     "zlib": require.resolve("browserify-zlib") ,
//     "path": require.resolve("path-browserify"),
//     "stream": require.resolve("stream-browserify"),
//     "util": require.resolve("util/"),
       "crypto": require.resolve("crypto-browserify")}

Or you can add fallback using react-app-rewired as was descirebed in github https://github.com/facebook/create-react-app/issues/11756 Install react-app-rewired,create config-overrides.js file in root of your project. My code in file

module.exports = function override (config, env) {
console.log('override')
let loaders = config.resolve
loaders.fallback = {
    "fs": false,
    "tls": false,
    "net": false,
    "http": require.resolve("stream-http"),
    "https": false,
    "zlib": require.resolve("browserify-zlib") ,
    "path": require.resolve("path-browserify"),
    "stream": require.resolve("stream-browserify"),
    "util": require.resolve("util/"),
    "crypto": require.resolve("crypto-browserify")
}

return config

}

In package.json change scripts from 'start': 'react-scripts start' to 'start': 'react-app-rewired start'. Then start project npm run start or yarn start

CodePudding user response：

This looks like a new issue with many packages including web3 as these are not compatible with Webpack v5 without adding fallbacks for the polyfils.

Issue noted here: https://github.com/facebook/create-react-app/issues/11756

I solved this issue by adding the fallback to my webpack.config.js file;

module.exports = {
    resolve: {
        fallback: {
            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'),
            stream: require.resolve('stream-browserify'),
        },
    },
};

but also need but got compilation errors on the build process:

FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory" error

this was resolved by adding to my .env file;

GENERATE_SOURCEMAP=false

hope this helps.