getLikeInfo() {
this.firestore.getDocument({
path: ['Posts', this.postData.postId],
onComplete: (result) => {
let userDocument = result.data();
this.userLikeId = userDocument!['creatorId'];
},
});

I want access to the sub collection "PostLinks". I tried more and more thing, but none work. Can someone explain me how I can access on a sub collection?
I don't exactly know what framework/library your this.firestore comes from, but I think you're looking for something like:
this.firestore.getDocuments({
path: ['Posts', this.postData.postId, 'PostLikes'],
...