Admin 发布的文章

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Copy</title>
</head>
<body>
  <button onclick="copyText(new Date().toLocaleString())">Copy</button>
  <script>
    function copyText(text) {
      if (!navigator.clipboard) {
        return;
      }
      navigator.clipboard.writeText(text).then(()=>{
        console.log('Async: Copying to clipboard was successful!');
      }, (error)=>{
        console.error('Async: Could not copy text: ', error);
      })
    }
  </script>
</body>
</html>

Bug描述

  • react 17 引入 @cosmjs/amino运行，报错如下：

    Compiled with problems:X

ERROR in ./node_modules/cipher-base/index.js 3:16-43

Module not found: Error: Can't resolve 'stream' in '/Users/eason/Desktop/untitled folder/react17-cosmjs-conflect2/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/hash-base/node_modules/safe-buffer/index.js 4:13-30

Module not found: Error: Can't resolve 'buffer' in '/Users/eason/Desktop/untitled folder/react17-cosmjs-conflect2/node_modules/hash-base/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 }

ERROR in ./node_modules/libsodium/dist/modules/libsodium.js 49:23-46

Module not found: Error: Can't resolve 'path' in '/Users/eason/Desktop/untitled folder/react17-cosmjs-conflect2/node_modules/libsodium/dist/modules'

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/readable-stream/lib/_stream_readable.js 46:13-37

Module not found: Error: Can't resolve 'buffer' in '/Users/eason/Desktop/untitled folder/react17-cosmjs-conflect2/node_modules/readable-stream/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: { "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 }

ERROR in ./node_modules/readable-stream/lib/_stream_writable.js 70:13-37

Module not found: Error: Can't resolve 'buffer' in '/Users/eason/Desktop/untitled folder/react17-cosmjs-conflect2/node_modules/readable-stream/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: { "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 }

ERROR in ./node_modules/readable-stream/lib/internal/streams/buffer_list.js 74:15-32

Module not found: Error: Can't resolve 'buffer' in '/Users/eason/Desktop/untitled folder/react17-cosmjs-conflect2/node_modules/readable-stream/lib/internal/streams'

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 }

ERROR in ./node_modules/ripemd160/index.js 3:13-37

Module not found: Error: Can't resolve 'buffer' in '/Users/eason/Desktop/untitled folder/react17-cosmjs-conflect2/node_modules/ripemd160'

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 }

ERROR in ./node_modules/safe-buffer/index.js 2:13-30

Module not found: Error: Can't resolve 'buffer' in '/Users/eason/Desktop/untitled folder/react17-cosmjs-conflect2/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 }

ERROR in ./node_modules/string_decoder/node_modules/safe-buffer/index.js 4:13-30

Module not found: Error: Can't resolve 'buffer' in '/Users/eason/Desktop/untitled folder/react17-cosmjs-conflect2/node_modules/string_decoder/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 }

复现步骤

  1. 新建react项目

    npx create-react-app react17-cosmjs-conflect

  2. 安装@cosmjs/amino

    npm i @cosmjs/amino

  3. 在/src/index.js引入@cosmjs/stargate

    import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';
import reportWebVitals from './reportWebVitals';

import {decodeBech32Pubkey} from '@cosmjs/amino'
console.log(decodeBech32Pubkey)

ReactDOM.render(
  <React.StrictMode>
    <App />
  </React.StrictMode>,
  document.getElementById('root')
);
reportWebVitals();

  4. 运行

    npm run start
  5. 报错如开篇所示

Bug原因

npx create-react-app命令创建的React17默认调用的是webpack5，相比webpack4，精简了很多自带的包，需要手动安装才行

解决方法1

将react-scripts由默认的5.0.0改为4.0.3，npm i [email protected]即可

解决方法2

  1. 将react 17的webpack config从node_modules里暴露出来，如果提示git uncommitted就先commit一下

    npm run eject

  2. 安装这4个包：

    npm i stream-browserify buffer path-browserify crypto-browserify crypto-browserify

  3. 根据报错提示配置 /config/webpack.config.js

    搜索“resolve:”，在resolve内添加fallback节点，内容如下

    fallback: {
  "stream": require.resolve("stream-browserify"),
  "buffer": require.resolve("buffer/"),
  "path": require.resolve("path-browserify"),
  "crypto": require.resolve("crypto-browserify")
}

  4. 这时候再npm run start运行就没有error了，但是有40个warning，都是关于cosmjs缺少source map的，如果不想看到这个错误，可以在跟resolve节点同级的地方添加以下属性，搜索“resolve:”，在上一行放：

    ignoreWarnings: [/Failed to parse source map/],

提示：如果没有将webpack config从node_modules里暴露出来，直接在项目根目录创建webpack.config.js文件去配置无法解决此bug

  1. install package

    yarn add react-router-dom

  2. in scr/App.tsx

    import { BrowserRouter as Router, Routes, Route } from 'react-router-dom'
import MainPage from './pages/MainPage/MainPage'
import User from './pages/User/User'
import HomePage from './pages/HomePage/HomePage'
export default function App() {
    return (
        <Router>
            <Routes>
          <Route path='/' element={<MainPage />}>
            <Route index element={<HomePage />} />
            <Route path='user' element={<User />} />
          </Route>
        </Routes>
        </Router>
    )
}

  3. in src/pages/MainPage/MainPage.tsx

    import { Outlet } from "react-router-dom"
export default function App() {
    return (
        <div>
            <div>Navigator</div>
            <Outlet context={{username: 'Tommy'}} />
        </div>
    )
}

  4. in src/pages/User/User.tsx

    import { useOutletContext } from "react-router-dom"
export default function App() {
    const context: any = useOutletContext()
    return (
        <div>
            <div>context.username</div>
        </div>
    )
}

npm i cheerio

const fs = require("fs");
const cheerio = require("cheerio");
fs.readFile("./yt.html", "utf-8", (err, data) => {
  if (err) throw err; // /user/brhm8900/videos
  const $ = cheerio.load(data);
  $("#video-title").each(function () {
    const title = $(this).text();
    if ($(this).text().indexOf("S06E") > -1) {
      console.log($(this).attr("href"));
    }
  });
});

'use strict';
exports.main = async (event, context) => {
    let headers = event.headers
    delete headers.host
    const res = await uniCloud.httpclient.request(event.queryStringParameters.url, {
        method: event.httpMethod,
        headers: headers,
        content: event.body,
        rejectUnauthorized: false,
        followRedirect: true
    })
    return {
        // mpserverlessComposedResponse: true, // https://uniapp.dcloud.io/uniCloud/http?id=integrationresponse
        statusCode: res.status,
        headers: res.headers,
        body: res.data.toString()
    }
}
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