Web3 问题：React 应用程序未编译

Question

我在编译时遇到了 React 应用程序的问题。 请在下面找到问题并截图。

ERROR in ./node_modules/web3-providers-http/lib/index.js 30:11-26
Module not found: Error: Can't resolve 'http' in '/Users/rohit/Downloads/Personal/web3/react-minting-website/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 }
 @ ./node_modules/web3-core-requestmanager/lib/index.js 56:16-46
 @ ./node_modules/web3-core/lib/index.js 23:23-58
 @ ./node_modules/web3/lib/index.js 32:11-31
 @ ./src/index.js 10:0-24 14:13-17

经过审查，我发现问题与 web3 相关的依赖项有关：

https://www.npmjs.com/package/web3
https://www.npmjs.com/package/@web3-react/core
https://www.npmjs.com/package/@web3-react/injected-connector

有人可以帮助我吗？我正在使用 LTS 版本，这些是什么稳定版本？

请提出建议。

Answer 1

随着 webpack 规模的增长，他们删除了 webpack5 中的 polyfill。看起来您正在使用 create-react-app (CRA) 并且 webpack 配置未在 CRA 中向用户公开。您可以使用eject 公开它。你可能在 package.json 中有这个脚本：

   "eject": "react-scripts eject"

所以运行npm run eject。不建议这样做，因为这意味着您将不再受益于 CRA 的更新。

您可以使用rewire 或craco 处理弹出。

获得 webpack 配置后，您需要将 resolve 属性添加到 webpack 配置并安装所有需要的包：

resolve: {
    extensions: [".js", ".css"],
    alias: {
      // add as many aliases as you like!
      // optional
      components: path.resolve(__dirname, "src/components"),
    },
    fallback: {
      // path: require.resolve("path-browserify"),
      fs: false,
      assert: require.resolve("assert/"),
      os: require.resolve("os-browserify/browser"),
      constants: require.resolve("constants-browserify"),
      stream: require.resolve("stream-browserify"),
      crypto: require.resolve("crypto-browserify"),
      http: require.resolve("stream-http"),
      https: require.resolve("https-browserify"),
    },
  },

我有webpac5 Boilerplate。如果你愿意，你可以使用它：

webpack5 boilerplate github repo