const is undefined using mobx and typescript

Question

I have the following code

export const NavViews = {
    test: "test1",
    test2: "test2"
} as const;

When I do

export class MainViewsStore {

     @computed
     get isLandingPage() {
        return this.primaryView === NavViews.test;
     }
}

When I call the code this._mainViewsStore.isLandingPage, it's false even though this.primaryView === NavViews.test

I'm using mobx and typescript. The NavViews.test is undefined. Has anyone seen a situation like that before?