NgXs dynamic selector: TypeError: Cannot read property 'x' of undefined

Question

I'm trying to create a NgXs dynamic selector, but I get the runtime error when the selector is used:

TypeError: Cannot read property 'x' of undefined
    at my-state.state.ts:56
    at wrappedSelectorFn (ngxs-store.js:2136)
    at memoized (ngxs-store-internals.js:58)
    at memoized (ngxs-store-internals.js:58)
    at Store.selectSnapshot (ngxs-store.js:2343)
    ...

The selector code:

@State({ ... })
export class MyState {
    @Selector()
    static translations(lng: model.Language) {
        return createSelector([MyState], (state: MyStateModel) => {
            return state.translations[lng];
        });
    }
    ...
}

Answer 1

The reason is the @Selector() decorator, which is intended to be used only with lazy selectors, but not dynamics. I removed the decorator and the problem was solved.

@State({ ... })
export class MyState {
    // no decorators here
    static translations(lng: model.Language) {
        return createSelector([MyState], (state: MyStateModel) => {
            return state.translations[lng];
        });
    }
    ...
}