How can I write to a global variable in Aurelia?

Question

I'm writing an Aurelia application and I have registered an instance of a class inside the aurelia container. Now, when I authenticate a user, that instance has to be modified. How do I modify the original instance from anywhere in my code?

Answer 1

If you want to follow the dependency injection pattern, you need to inject that instance into any class that wants to modify the instance.

import { inject } from 'aurelia-framework'
import { MyClass } from './my-class';

@inject(MyClass)
export class MyViewModel {
    constructor(MyClass) {
        this.myClass = MyClass;
    }
    somethingSpecial() {
        this.myClass.foo = 'bar';
    }
}

Answer 2

How do I modify the original instance from anywhere in my code

Best that put the instance in a module. And then also expose functions that modify the instance. eg

let foo = {}

export function getFoo(){return foo}
export function setFoo(bar){ /* do something */}