Socket.io ionic2汇总生成失败：捆绑产品失败：无法调用命名空间（'；io'；）

在新项目中升级ionic2后（从零开始）。。 无法使用套接字.io

import * as io from 'socket.io-client'; ... this.socket = io(url); .... 错误打印和配置如下所示：

[12:19:27]  bundle prod failed:  Cannot call a namespace ('io')
[12:19:27]  Error: Cannot call a namespace ('io')
    at error (/*****************/node_modules/rollup/dist/rollup.js:5404:12)
    at CallExpression.bind (/*****************/node_modules/rollup/dist/rollup.js:5837:5)
    at /*****************/node_modules/rollup/dist/rollup.js:5149:50
    at AssignmentExpression.eachChild (/*****************/node_modules/rollup/dist/rollup.js:5166:5)
    at AssignmentExpression.bind (/*****************/node_modules/rollup/dist/rollup.js:5149:7)
    at AssignmentExpression.bind (/*****************/node_modules/rollup/dist/rollup.js:5509:23)
    at /*****************/node_modules/rollup/dist/rollup.js:5149:50
    at ExpressionStatement.eachChild (/*****************/node_modules/rollup/dist/rollup.js:5166:5)
    at ExpressionStatement.bind (/*****************/node_modules/rollup/dist/rollup.js:5149:7)
    at BlockStatement.bind (/*****************/node_modules/rollup/dist/rollup.js:5615:9)
Error running ionic app script "build": Error: Cannot call a namespace ('io')

npm ERR! Linux 4.4.0-38-generic
npm ERR! argv "/.nvm/versions/node/v6.7.0/bin/node" "/.nvm/versions/node/v6.7.0/lib/node_modules/npm/bin/npm-cli.js" "run-script" "build"
npm ERR! node v6.7.0
npm ERR! npm  v3.10.3
npm ERR! code ELIFECYCLE
npm ERR! ionic-hello-world@ build: `ionic-app-scripts build`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the ionic-hello-world@ build script 'ionic-app-scripts build'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the ionic-hello-world package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     ionic-app-scripts build
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs ionic-hello-world
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls ionic-hello-world
npm ERR! There is likely additional logging output above.

package.json

    {
...
      "dependencies": {
        "@ionic/storage": "^1.0.3",
        "ionic-angular": "^2.0.0-rc.0",
        "ionic-native": "^2.0.3",
        "ionicons": "^3.0.0",
        "socket.io-client": "^1.5.0"
      },
      "devDependencies": {
        "@ionic/app-scripts": "latest",
        "typescript": "^2.0.3"
      },
...
      "cordovaPlugins": [
        "cordova-plugin-device",
        "cordova-plugin-console",
        "cordova-plugin-whitelist",
        "cordova-plugin-splashscreen",
        "cordova-plugin-statusbar",
        "ionic-plugin-keyboard"
      ],
      "cordovaPlatforms": []
    }

{
  "globalDependencies": {
    "socket.io-client": "registry:dt/socket.io-client#1.4.4+20160317120654"
  }
}

typings.json

    {
...
      "dependencies": {
        "@ionic/storage": "^1.0.3",
        "ionic-angular": "^2.0.0-rc.0",
        "ionic-native": "^2.0.3",
        "ionicons": "^3.0.0",
        "socket.io-client": "^1.5.0"
      },
      "devDependencies": {
        "@ionic/app-scripts": "latest",
        "typescript": "^2.0.3"
      },
...
      "cordovaPlugins": [
        "cordova-plugin-device",
        "cordova-plugin-console",
        "cordova-plugin-whitelist",
        "cordova-plugin-splashscreen",
        "cordova-plugin-statusbar",
        "ionic-plugin-keyboard"
      ],
      "cordovaPlatforms": []
    }

{
  "globalDependencies": {
    "socket.io-client": "registry:dt/socket.io-client#1.4.4+20160317120654"
  }
}

系统信息

• Cordova CLI:6.3.1
• 离子框架版本：2.0.0-beta.11
• 爱奥尼亚CLI版本：2.1.0-beta.3
• 爱奥尼亚应用程序库版本：2.1.0-beta.1
• OS:Distributor ID:Ubuntu说明：Ubuntu 16.04.1 LTS
• 节点版本：v6.7.0

---

解决方案：无通配符导入
从“socket.io客户端”导入io
反而
将*作为io从“socket.io客户端”导入语法

import io from 'socket.io-client'

…不是标准配置，您将出现运行时错误：
从“socket.io client”中将语法

import*保留为io

，然后在Typescript中将io强制转换为任意以调用默认方法：

    var ioFunc = (io as any).default ? (io as any).default : io;
    this.socket = ioFunc(url);