Class property in Typescript is initialized in the constructor, but is undefined in a member function

I'm encountering a recurring problem while developing an Electron application using Typescript. The backend has a set of controllers, with the AppController managing file system interactions and WindowController handling basic window functions. Here's a simplified version of the code:

AppController.ts

export class AppController {

  windowCtrl: WindowController

  constructor() {
    this.windowCtrl = new WindowController(Init Details);

    this.windowCtrl.windowEvents.on('window:get-parent-directory',
    () => {
      console.log('reached this point');
    });
  }
}

WindowController.ts

export class WindowController {

  public windowEvents: EventEmitter;

  constructor(Init Details) {
    this.windowEvents = new EventEmitter();
    ipcMain.on('get-parent', getParentDirectory);
  }

  getParentDirectory() {
    this.windowEvents.emit('window:get-parent-directory');
  }
}

The windowEvents event emitter serves as the communication bridge between classes through messages. I've used EventEmitters in Angular before and checked Node documentation to avoid mistakes. Despite my research efforts, I keep facing issues like not initializing it in the constructor. Similar problems arose when working with BrowserWindow instances from Electron. Initializing in the constructor works, but accessing it within member functions returns undefined.

Any suggestions?

Answer №1

If you are confident in the accuracy of your code, but encounter inexplicable instances of undefined, it could be due to running into the issue of a circular dependency.

Your project-building tool may have detected two modules that rely on each other, either directly or indirectly. In order to address this conflict, one module may need to be temporarily designated as undefined.

To determine if this is indeed the problem, static analysis can be utilized. For example, TSLint's tslint-no-circular-imports rule offers a solution. Additionally, there exists a Webpack plugin that serves the same purpose.

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