Angular 10 Global is not defined at ../node_modules/socket.io-parser/is-buffer.js

問題描述：
Angular項目中使用了socketio-client庫，

{
    "dependencies": {
    ...
    "@feathersjs/socketio-client": "^4.4.3",
    ...
  },
}

使用：

import socketio from '@feathersjs/socketio-client'

@Injectable()
export class Socket {
  public socket: SocketIOClient.Socket
  public app: any

  constructor() {
    this.app = feathers()
      .configure(socketio(this.socket, {timeout: 20000}))
      .configure(authentication({path: '/login', storage: window.localStorage}))
  }
}

運行後報錯

global is not defined at Object…/node_modules/socket.io-parser/is-buffer.js

說在Object ./node_modules/socket.io-parser/is-buffer.js中沒有定義全局變量

解決辦法：
在polyfills.ts file中添加

// polyfills.ts
(window as any).global = window

參考：Global is not defined at …/node_modules/socket.io-parser/is-buffer.js