diff --git a/src/compat/firestore/interfaces.ts b/src/compat/firestore/interfaces.ts
index e865b16fd..6ee3405aa 100644
--- a/src/compat/firestore/interfaces.ts
+++ b/src/compat/firestore/interfaces.ts
@@ -1,63 +1,47 @@
 import { Subscriber } from 'rxjs';
 import firebase from 'firebase/compat/app';
-
-export type Settings =  firebase.firestore.Settings;
-export type CollectionReference<T = DocumentData> = firebase.firestore.CollectionReference<T>;
-export type DocumentReference<T = DocumentData> = firebase.firestore.DocumentReference<T>;
-export type PersistenceSettings = firebase.firestore.PersistenceSettings;
-export type DocumentChangeType = firebase.firestore.DocumentChangeType;
-export type SnapshotOptions = firebase.firestore.SnapshotOptions;
-export type FieldPath = firebase.firestore.FieldPath;
-export type Query<T = DocumentData> = firebase.firestore.Query<T>;
-
-export type SetOptions = firebase.firestore.SetOptions;
-export type DocumentData = firebase.firestore.DocumentData;
-
-export interface DocumentSnapshotExists<T> extends firebase.firestore.DocumentSnapshot {
-  readonly exists: true;
-  data(options?: SnapshotOptions): T;
+export declare type Settings = firebase.firestore.Settings;
+export declare type CollectionReference<T = DocumentData> = firebase.firestore.CollectionReference<T>;
+export declare type DocumentReference<T = DocumentData> = firebase.firestore.DocumentReference<T>;
+export declare type PersistenceSettings = firebase.firestore.PersistenceSettings;
+export declare type DocumentChangeType = firebase.firestore.DocumentChangeType;
+export declare type SnapshotOptions = firebase.firestore.SnapshotOptions;
+export declare type FieldPath = firebase.firestore.FieldPath;
+export declare type Query<T = DocumentData> = firebase.firestore.Query<T>;
+export declare type SetOptions = firebase.firestore.SetOptions;
+export declare type DocumentData = firebase.firestore.DocumentData;
+export interface DocumentSnapshotExists<T> extends firebase.firestore.DocumentSnapshot<T> {
+    readonly exists: true;
+    data(options?: SnapshotOptions): T;
 }
-
 export interface DocumentSnapshotDoesNotExist extends firebase.firestore.DocumentSnapshot {
-  readonly exists: false;
-  data(options?: SnapshotOptions): undefined;
-  get(fieldPath: string | FieldPath, options?: SnapshotOptions): undefined;
+    readonly exists: false;
+    data(options?: SnapshotOptions): undefined;
+    get(fieldPath: string | FieldPath, options?: SnapshotOptions): undefined;
 }
-
-export type DocumentSnapshot<T> = DocumentSnapshotExists<T> | DocumentSnapshotDoesNotExist;
-
-export interface QueryDocumentSnapshot<T> extends firebase.firestore.QueryDocumentSnapshot {
-  data(options?: SnapshotOptions): T;
+export declare type DocumentSnapshot<T> = DocumentSnapshotExists<T> | DocumentSnapshotDoesNotExist;
+export interface QueryDocumentSnapshot<T> extends firebase.firestore.QueryDocumentSnapshot<T> {
+    data(options?: SnapshotOptions): T;
 }
-
-export interface QuerySnapshot<T> extends firebase.firestore.QuerySnapshot {
-  readonly docs: QueryDocumentSnapshot<T>[];
+export interface QuerySnapshot<T> extends firebase.firestore.QuerySnapshot<T> {
+    readonly docs: QueryDocumentSnapshot<T>[];
 }
-
-export interface DocumentChange<T> extends firebase.firestore.DocumentChange {
-  readonly doc: QueryDocumentSnapshot<T>;
+export interface DocumentChange<T> extends firebase.firestore.DocumentChange<T> {
+    readonly doc: QueryDocumentSnapshot<T>;
 }
-
 export interface DocumentChangeAction<T> {
-  type: DocumentChangeType;
-  payload: DocumentChange<T>;
+    type: DocumentChangeType;
+    payload: DocumentChange<T>;
 }
-
 export interface Action<T> {
-  type: string;
-  payload: T;
+    type: string;
+    payload: T;
 }
-
 export interface Reference<T> {
-  onSnapshot: (options: firebase.firestore.SnapshotListenOptions, sub: Subscriber<any>) => any;
+    onSnapshot: (options: firebase.firestore.SnapshotListenOptions, sub: Subscriber<any>) => any;
 }
-
-// A convience type for making a query.
-// Example: const query = (ref) => ref.where('name', == 'david');
-export type QueryFn<T = DocumentData> = (ref: CollectionReference<T>) => Query<T>;
-
-export type QueryGroupFn<T = DocumentData> = (query: Query<T>) => Query<T>;
-
+export declare type QueryFn<T = DocumentData> = (ref: CollectionReference<T>) => Query<T>;
+export declare type QueryGroupFn<T = DocumentData> = (query: Query<T>) => Query<T>;
 /**
  * A structure that provides an association between a reference
  * and a query on that reference. Note: Performing operations
@@ -81,6 +65,7 @@ export type QueryGroupFn<T = DocumentData> = (query: Query<T>) => Query<T>;
  * });
  */
 export interface AssociatedReference<T = DocumentData> {
-  ref: CollectionReference<T>;
-  query: Query<T>;
+    ref: CollectionReference<T>;
+    query: Query<T>;
 }
+