未找到 uws - 使用 SocketIO 的 VueJS答案

【问题标题】：uws not found - VueJS using SocketIO未找到 uws - 使用 SocketIO 的 VueJS
【发布时间】：2019-03-12 05:22:54
【问题描述】：

我正在尝试使用 SocketIO 构建一个 vue 应用程序。我在编译时遇到的第一个错误（ fs not found ）已经通过在我的 webpack.base.conf.js 文件中添加：node: { fs: 'empty' } 得到修复。

但我不知道如何解决第二个错误：

ERROR  Failed to compile with 1 errors                                 
This dependency was not found:
* uws in ./node_modules/engine.io/lib/server.js

【问题讨论】：

试过npm install？请分享nodejs、npm和uws版本
npm install 不会改变任何东西。版本：“uws”：“^99.0.0”，节点：v8.11.3 和 npm：5.6.0

标签： javascript node.js vue.js webpack fs

【解决方案1】：

import io from 'socket.io-client'

如果您不添加“-client”，则您正在使用服务器组件。这不起作用，因为浏览器上没有“fs”，只是在 nodejs 端。

要让 typescript 导入工作，您需要 npm install of @types/socket.io-client

更新：似乎，客户端不需要 uws 。我可以删除 uws 而不会遇到错误。如果需要，将重新检查...

【讨论】：

【解决方案2】：

似乎uws 软件包版本已被弃用，请参阅here

您可以安装其他稳定版本。试试下面

$ rm -rf ./node_modules/uws
$ npm install uws@10.148.1 --save

更新 1

目标和用途略有不同的新版本可在https://github.com/uNetworking/uWebSockets.js获得

由于已知的错误和问题，不建议使用旧版本。

【讨论】：

谢谢，它修复了错误。该应用程序启动但它不显示它。现在我得到这个错误： TypeError: exists is not a function。（在 'exists(filepath)' 中，'exists' 是未定义的）它不是来自我编写的文件。你知道如何解决这个问题吗？
@mp_weber 可以和package.json分享代码吗？
@mp_weber 如果您正在使用 fs.exists，您可以在此处参考更多信息nodejs.org/api/fs.html#fs_fs_exists_path_callback
我发布了我添加的最后一个代码和我的 package.json 。我通常不使用 fs.exists，但我的控制台现在说的有些不同。
@mp_weber 你能试试$ rm -rf ./node_modules && npm install吗？在 package.json 中保留 "uws": "10.148.1"

【解决方案3】：

package.json：

{
  "name": "chat",
  "version": "1.0.0",
  "description": "A Vue.js project",
  "author": "",
  "private": true,
  "scripts": {
    "dev": "node build/dev-server.js",
    "start": "node build/dev-server.js",
    "build": "node build/build.js",
    "unit": "cross-env BABEL_ENV=test karma start test/unit/karma.conf.js --single-run",
    "test": "npm run unit",
    "lint": "eslint --ext .js,.vue src test/unit/specs"
  },
  "dependencies": {
    "fs": "0.0.1-security",
    "socket.io": "^2.1.1",
    "socket.io-client": "^2.1.1",
    "uws": "^10.148.1",
    "vue": "^2.5.2",
    "vue-material": "^1.0.0-beta-10.2",
    "vue-router": "^3.0.1",
    "vue-socket.io": "^2.1.1-b"
  },
  "devDependencies": {
    "autoprefixer": "^7.1.5",
    "babel-core": "^6.26.0",
    "babel-eslint": "^8.0.1",
    "babel-loader": "^7.1.2",
    "babel-plugin-istanbul": "^4.1.5",
    "babel-plugin-transform-runtime": "^6.23.0",
    "babel-preset-env": "^1.6.0",
    "babel-preset-stage-2": "^6.24.1",
    "babel-register": "^6.26.0",
    "chai": "^4.1.2",
    "chalk": "^2.1.0",
    "connect-history-api-fallback": "^1.4.0",
    "copy-webpack-plugin": "^4.1.1",
    "cross-env": "^5.0.5",
    "css-loader": "^0.28.7",
    "cssnano": "^3.10.0",
    "eslint": "^4.9.0",
    "eslint-config-standard": "^10.2.1",
    "eslint-friendly-formatter": "^3.0.0",
    "eslint-loader": "^1.9.0",
    "eslint-plugin-html": "^3.2.2",
    "eslint-plugin-import": "^2.7.0",
    "eslint-plugin-node": "^5.2.0",
    "eslint-plugin-promise": "^3.6.0",
    "eslint-plugin-standard": "^3.0.1",
    "eventsource-polyfill": "^0.9.6",
    "express": "^4.16.3",
    "extract-text-webpack-plugin": "^3.0.0",
    "file-loader": "^1.1.5",
    "friendly-errors-webpack-plugin": "^1.6.1",
    "html-webpack-plugin": "^2.30.1",
    "http-proxy-middleware": "^0.17.4",
    "inject-loader": "^3.0.1",
    "karma": "^1.7.1",
    "karma-coverage": "^1.1.1",
    "karma-mocha": "^1.3.0",
    "karma-phantomjs-launcher": "^1.0.4",
    "karma-phantomjs-shim": "^1.5.0",
    "karma-sinon-chai": "^1.3.2",
    "karma-sourcemap-loader": "^0.3.7",
    "karma-spec-reporter": "0.0.31",
    "karma-webpack": "^2.0.5",
    "mocha": "^4.0.1",
    "opn": "^5.1.0",
    "optimize-css-assets-webpack-plugin": "^3.2.0",
    "ora": "^1.3.0",
    "phantomjs-prebuilt": "^2.1.15",
    "rimraf": "^2.6.2",
    "semver": "^5.4.1",
    "shelljs": "^0.7.8",
    "sinon": "^4.0.1",
    "sinon-chai": "^2.14.0",
    "sw-precache-webpack-plugin": "^0.11.4",
    "uglify-es": "^3.1.3",
    "url-loader": "^0.6.2",
    "vue-loader": "^13.3.0",
    "vue-style-loader": "^3.0.3",
    "vue-template-compiler": "^2.5.2",
    "webpack": "^3.7.1",
    "webpack-bundle-analyzer": "^2.9.0",
    "webpack-dev-middleware": "^1.12.0",
    "webpack-hot-middleware": "^2.19.1",
    "webpack-merge": "^4.1.0"
  },
  "engines": {
    "node": ">= 4.0.0",
    "npm": ">= 3.0.0"
  },
  "browserslist": [
    "> 1%",
    "last 2 versions",
    "not ie <= 8"
  ]
}

目前还没有太多代码。我添加的最后一件事是：

    <script>
    export default {
      data () {
        return {
          isConnected: false,
          socketMessage: ''
    } 
  },

  sockets: {
    connect () {
      // Fired when the socket connects.
      this.isConnected = true
    },

    disconnect () {
      this.isConnected = false
    },

    // Fired when the server sends something on the "messageChannel" channel.
    messageChannel (data) {
      this.socketMessage = data
    }
  },

  methods: {
    pingServer () {
      // Send the "pingServer" event to the server.
      this.$socket.emit('pingServer', 'PING!')
    }
  }
}
</script>

添加后我得到了所有错误。

【讨论】：