如何修复炼金术 web3 的错误 - Webpack < 5

Question

interact.js

require('dotenv').config();
const alchemyKey = process.env.REACT_APP_ALCHEMY_KEY;
import { createAlchemyWeb3 } from "@alch/alchemy-web3";
const web3 = createAlchemyWeb3(alchemyKey);
const contractABI = require('../contract-abi.json')
const contractAddress = "My_Contract_address";
export const mintNFT = async(url, name, description) => {
//error handling
if (url.trim() === "" || (name.trim() === "" || description.trim() === "")) { 
return {
success: false,
status: "❗Please make sure all fields are completed before minting.",
}
}
const tokenURI = "ipfs://My_URI"
window.contract = await new web3.eth.Contract(contractABI, contractAddress);
//set up your Ethereum transaction
const transactionParameters = {
to: contractAddress, // Required except during contract publications.
from: window.ethereum.selectedAddress, // must match user's active address.
'data': window.contract.methods.mintPublic(window.ethereum.selectedAddress, tokenURI).encodeABI()//make call to NFT smart contract 
};
//sign the transaction via Metamask
try {
const txHash = await window.ethereum
.request({
method: 'eth_sendTransaction',
params: [transactionParameters],
});
return {
success: true,
status: "✅ Check out your transaction on Etherscan: https://rinkeby.etherscan.io/tx/" + txHash
}
} catch (error) {
return {
success: false,
status: "😥 Something went wrong: " + error.message
}
}
}
export const connectWallet = async () => {
if (window.ethereum) {
try {
const addressArray = await window.ethereum.request({
method: "eth_requestAccounts",
});
const obj = {
status: "👆🏽 Write a message in the text-field above.",
address: addressArray[0],
};
return obj;
} catch (err) {
return {
address: "",
status: "😥 " + err.message,
};
}
} else {
return {
address: "",
status: (
<span>
<p>
{" "}
🦊{" "}
<a target="_blank" rel="noreferrer" href={`https://metamask.io/download.html`}>
You must install Metamask, a virtual Ethereum wallet, in your
browser.
</a>
</p>
</span>
),
};
}
};
export const getCurrentWalletConnected = async () => {
if (window.ethereum) {
try {
const addressArray = await window.ethereum.request({
method: "eth_accounts",
});
if (addressArray.length > 0) {
return {
address: addressArray[0],
status: "👆🏽 Write a message in the text-field above.",
};
} else {
return {
address: "",
status: "🦊 Connect to Metamask using the top right button.",
};
}
} catch (err) {
return {
address: "",
status: "😥 " + err.message,
};
}
} else {
return {
address: "",
status: (
<span>
<p>
{" "}
🦊{" "}
<a target="_blank" rel="noreferrer" href={`https://metamask.io/download.html`}>
You must install Metamask, a virtual Ethereum wallet, in your
browser.
</a>
</p>
</span>
),
};
}
};

我正在尝试将炼金术连接到我的前端react原生网站。但是我得到了这个错误：

Compiled with problems:X
ERROR in ./node_modules/@alch/alchemy-web3/node_modules/eth-lib/lib/bytes.js 7:193-227
Module not found: Error: Can't resolve 'crypto' in '/Users/keyesbruh/Documents/Programming/nft-project/node_modules/@alch/alchemy-web3/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/@alch/alchemy-web3/node_modules/web3-eth-accounts/lib/index.js 31:74-91
Module not found: Error: Can't resolve 'crypto' in '/Users/keyesbruh/Documents/Programming/nft-project/node_modules/@alch/alchemy-web3/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/@alch/alchemy-web3/node_modules/web3-providers-http/lib/index.js 30:11-26
Module not found: Error: Can't resolve 'http' in '/Users/keyesbruh/Documents/Programming/nft-project/node_modules/@alch/alchemy-web3/node_modules/web3-providers-http/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: { "http": require.resolve("stream-http") }'
- install 'stream-http'
If you don't want to include a polyfill, you can use an empty module like this:
resolve.fallback: { "http": false }

ERROR in ./node_modules/@alch/alchemy-web3/node_modules/web3-providers-http/lib/index.js 32:12-28
Module not found: Error: Can't resolve 'https' in '/Users/keyesbruh/Documents/Programming/nft-project/node_modules/@alch/alchemy-web3/node_modules/web3-providers-http/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: { "https": require.resolve("https-browserify") }'
- install 'https-browserify'
If you don't want to include a polyfill, you can use an empty module like this:
resolve.fallback: { "https": false }

ERROR in ./node_modules/assert/assert.js
Module build failed (from ./node_modules/source-map-loader/dist/cjs.js):
Error: ENOENT: no such file or directory, open '/Users/keyesbruh/Documents/Programming/nft-project/node_modules/assert/assert.js'

ERROR in ./node_modules/cipher-base/index.js 3:16-43
Module not found: Error: Can't resolve 'stream' in '/Users/keyesbruh/Documents/Programming/nft-project/node_modules/cipher-base'
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: { "stream": require.resolve("stream-browserify") }'
- install 'stream-browserify'
If you don't want to include a polyfill, you can use an empty module like this:
resolve.fallback: { "stream": false }

ERROR in ./node_modules/dotenv/lib/main.js 24:11-24
Module not found: Error: Can't resolve 'fs' in '/Users/keyesbruh/Documents/Programming/nft-project/node_modules/dotenv/lib'

ERROR in ./node_modules/dotenv/lib/main.js 26:13-28
Module not found: Error: Can't resolve 'path' in '/Users/keyesbruh/Documents/Programming/nft-project/node_modules/dotenv/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: { "path": require.resolve("path-browserify") }'
- install 'path-browserify'
If you don't want to include a polyfill, you can use an empty module like this:
resolve.fallback: { "path": false }

ERROR in ./node_modules/dotenv/lib/main.js 28:11-24
Module not found: Error: Can't resolve 'os' in '/Users/keyesbruh/Documents/Programming/nft-project/node_modules/dotenv/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: { "os": require.resolve("os-browserify/browser") }'
- install 'os-browserify'
If you don't want to include a polyfill, you can use an empty module like this:
resolve.fallback: { "os": false }

ERROR in ./node_modules/eth-lib/lib/bytes.js 9:193-227
Module not found: Error: Can't resolve 'crypto' in '/Users/keyesbruh/Documents/Programming/nft-project/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/xhr2-cookies/dist/xml-http-request.js 37:11-26
Module not found: Error: Can't resolve 'http' in '/Users/keyesbruh/Documents/Programming/nft-project/node_modules/xhr2-cookies/dist'
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: { "http": require.resolve("stream-http") }'
- install 'stream-http'
If you don't want to include a polyfill, you can use an empty module like this:
resolve.fallback: { "http": false }

ERROR in ./node_modules/xhr2-cookies/dist/xml-http-request.js 39:12-28
Module not found: Error: Can't resolve 'https' in '/Users/keyesbruh/Documents/Programming/nft-project/node_modules/xhr2-cookies/dist'
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: { "https": require.resolve("https-browserify") }'
- install 'https-browserify'
If you don't want to include a polyfill, you can use an empty module like this:
resolve.fallback: { "https": false }

ERROR in ./node_modules/xhr2-cookies/dist/xml-http-request.js 41:9-22
Module not found: Error: Can't resolve 'os' in '/Users/keyesbruh/Documents/Programming/nft-project/node_modules/xhr2-cookies/dist'
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: { "os": require.resolve("os-browserify/browser") }'
- install 'os-browserify'
If you don't want to include a polyfill, you can use an empty module like this:
resolve.fallback: { "os": false }

我以前在以下线程中解决了这个错误：错误：Webpack<5在安装web3并实现到React Native App.js 之后

但那是通过另一种方式导入web3。这个炼金术我不确定是否有其他方法可以进口。谢谢。

Answer 1

我最近也遇到了这个问题。从我的研究中，我发现这是Webpack的一个已知问题。我使用的是react脚本5.0.0版本。对我来说，最简单的解决方案是在项目中使用早期版本的react脚本，删除node_modules目录并重新运行npm install。

// package.json
{
...normal package.json attributes
"dependencies": {
...other dependencies,
"react-scripts": "4.0.3"
}
}