While compiling there are no errors, compile fine. But when I call the method in the controller got an error. It looks like during the compilation class methods are missing.

If you need more information about the project config - please, ask - I will share. For now, I don't have any ideas on how to fix it. The similar code on other projects works fine.

TypeError: Cannot read properties of undefined (reading 'onOpenMessage') at WebSocket. (/Users/xxx/redqueen-middleware/src/controllers/websocket.ts:23:16) at WebSocket.onMessage (/Users/xxx/redqueen-middleware/node_modules/ws/lib/event-target.js:132:16) at WebSocket.emit (node:events:513:28) at Receiver.receiverOnMessage (/Users/xxx/redqueen-middleware/node_modules/ws/lib/websocket.js:1068:20) at Receiver.emit (node:events:513:28) at Receiver.dataMessage (/Users/xxx/redqueen-middleware/node_modules/ws/lib/receiver.js:517:14) at Receiver.getData (/Users/xxx/redqueen-middleware/node_modules/ws/lib/receiver.js:435:17) at Receiver.startLoop (/Users/xxx/redqueen-middleware/node_modules/ws/lib/receiver.js:143:22) at Receiver._write (/Users/xxx/redqueen-middleware/node_modules/ws/lib/receiver.js:78:10) at writeOrBuffer (node:internal/streams/writable:391:12) [ERROR] 16:46:06 TypeError: Cannot read properties of undefined (reading 'onOpenMessage')

Controller code

class WebsocketController {
  initWebsocket(websocket: WebSocket): void {
    //some code, works fine before calling method `onOpenMessage`
    this.onOpenMessage();
  }

  private onOpenMessage(): void {
    //some code
  }
}

export default new WebsocketController();

My tsconfig.json

{
  "compilerOptions": {
    "module": "commonjs",
    "declaration": false,
    "noImplicitAny": false,
    "removeComments": true,
    "noLib": false,
    "allowSyntheticDefaultImports": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "target": "es6",
    "esModuleInterop": true,
    "lib": [
      "dom",
      "es6",
      "esnext.asynciterable"
    ],
    "typeRoots": [
      "./custom_typings",
      "./node_modules/@types"
    ],
    "sourceMap": true,
    "allowJs": true,
    "outDir": "./build",
    "baseUrl": "./src",
    "resolveJsonModule": true
  },
  "include": [
    "src/**/*",
    "config/**/*"
  ],
  "exclude": [
    "node_modules",
    "**/*.spec.ts",
    "**/*.test.ts",
    "custom_typings"
  ]
}

Here is my server.ts

import express from 'express';
import expressWs from 'express-ws';
import winston from 'winston';

import WebsocketController from './controllers/websocket';

export default function initServer() {
  const app = express();
  const port = process.env.PORT;
  const router = express.Router();
  global.websocketsList = [];

  expressWs(app);

  router.ws('/ws-request', WebsocketController.initWebsocket);

  app.use('/', router);

  app.listen(port, () => {
    winston.info(`Middleware server start on port ${port}`);
  });
}

Converting method onOpenMessage from private to public does not give any result.

CodePudding user response：

1. You are trying to use the instance method as statis

2. You lost this reference

Create an instance and use anonymous function instead:

const wsController = new WebsocketController() 
router.ws('/ws-request', () => wsController.initWebsocket());

CodePudding user response：

You never instantiate the class. Should

const wsController = new WebsocketController() 
router.ws('/ws-request', wsController.initWebsocket);

Or:

Export the instance from the controller file:

exports.default = new WebsocketController()