import firebase from 'firebase/compat/app';
import { Observable } from 'rxjs';

export declare type OrderByDirection = firebase.firestore.OrderByDirection;
export declare type WhereFilterOp = firebase.firestore.WhereFilterOp;
export declare type DocumentReference<M> = firebase.firestore.DocumentReference;
export declare type CollectionReference<M> =
  firebase.firestore.CollectionReference;
export declare type DocumentData = firebase.firestore.DocumentData;
export declare type DocumentSnapshot<T extends DocumentData> =
  | DocumentSnapshotExists<T>
  | DocumentSnapshotDoesNotExist;
export declare type AsyncType<M> = Observable<M>;

export interface DocumentSnapshotExists<T extends DocumentData>
  extends firebase.firestore.DocumentSnapshot {
  readonly exists: true;
  data(options?: firebase.firestore.SnapshotOptions): T;
}

export interface DocumentSnapshotDoesNotExist
  extends firebase.firestore.DocumentSnapshot {
  readonly exists: false;
  data(options?: firebase.firestore.SnapshotOptions): undefined;
  get(
    fieldPath: string | firebase.firestore.FieldPath,
    options?: firebase.firestore.SnapshotOptions
  ): undefined;
}

export interface QueryDocumentSnapshot<T extends DocumentData>
  extends firebase.firestore.QueryDocumentSnapshot {
  data(options?: firebase.firestore.SnapshotOptions): T;
}