How to do remove an entire document collection in angularfire firestore

Question

I just changed my code as below and it is working. Bulk delete is possible in google cloud-firestore.

async deleteMembersOfGroup(clubId: string, groupId: string) {
    //path of the collection
    const path = "club/" + clubId + "/group/" + groupId + "/group-members";

//query snapshot
    const qry: firebase.firestore.QuerySnapshot = await this.afs.collection(path).ref.get();

    const batch = this.afs.firestore.batch();

//looping through docs in the collection to delete docs as a bulk operation
    qry.forEach(doc => {
      console.log('deleting....', doc.id);
      batch.delete(doc.ref);
    });

//finally commit
    batch.commit().then(res => console.log('committed batch.'))
    .catch(err => console.error('error committing batch.', err));
  }