I have this typescript data in a config file:

const filtersTracking = {
  [SEARCH_TYPE_ARTICLES]: {
    orderBy: {
        category: 'Suche Filter Rechtstipps',
        action: 'Sortierung Auswahl',
    },
    practiceAreas: {
      category: 'Suche Filter Rechtstipps',
      action: 'Rechtsgebiet Auswahl',
    },
    ratingAverage: {
      category: 'Suche Filter Rechtstipps',
      action: 'Bewertung Sterne',
    },
    ratingCount: {
      category: 'Suche Filter Rechtstipps',
      action: 'Anzahl Bewertungen',
    },
    publicationYear: {
      category: 'Suche Filter Rechtstipps',
      action: 'Publikation',
    },
    isGuide: {
      category: 'Suche Filter Rechtstipps',
      action: 'Ratgeber',
    },
    hasVideo: {
      category: 'Suche Filter Rechtstipps',
      action: 'Video',
    },
    internationalLaws: {
      category: 'Suche Filter Rechtstipps',
      action: 'Internationales Recht',
    },
  },
}

what I am trying to do is to get 'category' and 'action' data, I have tried following methods but none worked for me:

1. filtersTracking[SEARCH_TYPE_ARTICLES][key]
2. filtersTracking[SEARCH_TYPE_ARTICLES].key
3. filtersTracking[SEARCH_TYPE_ARTICLES].[key]

here 'key' is a dynamic variable and I am getting the data key(e.g 'orderBy' or 'practiceArea') inside 'key'.

public function(key) {
console.log(filtersTracking[SEARCH_TYPE_ARTICLES][key])
}