Get out of the circular!

circular.js

class Initialisation {
    constructor() {        
        this.aFunctionThatThrowsImmediately();
        this.aFunctionThatThrowsLater();
    }

    // Fake stuff to show the return values of module
    aFunctionThatThrowsImmediately() {
        console.log(this.errorCallback()); // error thrown, but platform not set
    }
    aFunctionThatThrowsLater() {
        setTimeout(() => {
            console.log(this.errorCallback()); // error found: platform-arbitrary-id
        }, 1000);
    }

    async getPlatform () {
        return "platform-arbitrary-id";
    }
    
    // Set a default no-op errorCallback (in case error is thrown)
    errorCallback() {
        return "error thrown, but platform not set"
    }

    // Expose a setter for platform
    setErrorCallback(errorCallback) {
        this.errorCallback = errorCallback;
    }
}

class Error {
    constructor(getPlatform) {
        this.setPlatform(getPlatform);
    }
    async setPlatform(getPlatform) {
        this.platform = await getPlatform();
    }
    onError() {
        return `error found: ${this.platform}`;
    }
}

const initInstance = new Initialisation();
const errorInstance = new Error(initInstance.getPlatform);
initInstance.setErrorCallback(errorInstance.onError.bind(errorInstance));