diff --git a/.changeset/friendly-crews-dream.md b/.changeset/friendly-crews-dream.md
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--- /dev/null
+++ b/.changeset/friendly-crews-dream.md
@@ -0,0 +1,2 @@
+---
+---
diff --git a/packages/firestore/exp/test/shim.ts b/packages/firestore/exp/test/shim.ts
new file mode 100644
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--- /dev/null
+++ b/packages/firestore/exp/test/shim.ts
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+/**
+ * @license
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import * as legacy from '@firebase/firestore-types';
+import * as exp from '../';
+
+import {
+  addDoc,
+  arrayRemove,
+  arrayUnion,
+  clearIndexedDbPersistence,
+  collection,
+  collectionGroup,
+  deleteDoc,
+  deleteField,
+  disableNetwork,
+  doc,
+  DocumentReference as DocumentReferenceExp,
+  enableIndexedDbPersistence,
+  enableMultiTabIndexedDbPersistence,
+  enableNetwork,
+  FieldPath as FieldPathExp,
+  getDoc,
+  getDocFromCache,
+  getDocFromServer,
+  getQuery,
+  getQueryFromCache,
+  getQueryFromServer,
+  increment,
+  initializeFirestore,
+  onSnapshot,
+  onSnapshotsInSync,
+  parent,
+  queryEqual,
+  refEqual,
+  runTransaction,
+  serverTimestamp,
+  setDoc,
+  snapshotEqual,
+  terminate,
+  updateDoc,
+  waitForPendingWrites,
+  writeBatch
+} from '../../exp/index.node';
+import { UntypedFirestoreDataConverter } from '../../src/api/user_data_reader';
+import { isPartialObserver, PartialObserver } from '../../src/api/observer';
+import { isPlainObject } from '../../src/util/input_validation';
+
+export { GeoPoint, Blob, Timestamp } from '../index.node';
+
+/* eslint-disable @typescript-eslint/no-explicit-any */
+
+// This module defines a shim layer that implements the legacy API on top
+// of the experimental SDK. This shim is used to run integration tests against
+// both SDK versions.
+
+export class FirebaseFirestore implements legacy.FirebaseFirestore {
+  constructor(private readonly _delegate: exp.FirebaseFirestore) {}
+
+  app = this._delegate.app;
+
+  settings(settings: legacy.Settings): void {
+    initializeFirestore(this.app, settings);
+  }
+
+  enablePersistence(settings?: legacy.PersistenceSettings): Promise<void> {
+    return settings?.synchronizeTabs
+      ? enableMultiTabIndexedDbPersistence(this._delegate)
+      : enableIndexedDbPersistence(this._delegate);
+  }
+
+  collection(collectionPath: string): CollectionReference<legacy.DocumentData> {
+    return new CollectionReference(collection(this._delegate, collectionPath));
+  }
+
+  doc(documentPath: string): DocumentReference<legacy.DocumentData> {
+    return new DocumentReference(doc(this._delegate, documentPath));
+  }
+
+  collectionGroup(collectionId: string): Query<legacy.DocumentData> {
+    return new Query(collectionGroup(this._delegate, collectionId));
+  }
+
+  runTransaction<T>(
+    updateFunction: (transaction: legacy.Transaction) => Promise<T>
+  ): Promise<T> {
+    return runTransaction(this._delegate, t =>
+      updateFunction(new Transaction(t))
+    );
+  }
+
+  batch(): legacy.WriteBatch {
+    return new WriteBatch(writeBatch(this._delegate));
+  }
+
+  clearPersistence(): Promise<void> {
+    return clearIndexedDbPersistence(this._delegate);
+  }
+
+  enableNetwork(): Promise<void> {
+    return enableNetwork(this._delegate);
+  }
+
+  disableNetwork(): Promise<void> {
+    return disableNetwork(this._delegate);
+  }
+
+  waitForPendingWrites(): Promise<void> {
+    return waitForPendingWrites(this._delegate);
+  }
+
+  onSnapshotsInSync(observer: {
+    next?: (value: void) => void;
+    error?: (error: Error) => void;
+    complete?: () => void;
+  }): () => void;
+  onSnapshotsInSync(onSync: () => void): () => void;
+  onSnapshotsInSync(arg: any): () => void {
+    return onSnapshotsInSync(this._delegate, arg);
+  }
+
+  terminate(): Promise<void> {
+    return terminate(this._delegate);
+  }
+
+  INTERNAL = {
+    delete: () => terminate(this._delegate)
+  };
+}
+
+export class Transaction implements legacy.Transaction {
+  constructor(private readonly _delegate: exp.Transaction) {}
+
+  get<T>(documentRef: DocumentReference<T>): Promise<DocumentSnapshot<T>> {
+    return this._delegate
+      .get(documentRef._delegate)
+      .then(result => new DocumentSnapshot(result));
+  }
+
+  set<T>(
+    documentRef: DocumentReference<T>,
+    data: T,
+    options?: legacy.SetOptions
+  ): Transaction {
+    if (options) {
+      this._delegate.set(documentRef._delegate, unwrap(data), options);
+    } else {
+      this._delegate.set(documentRef._delegate, unwrap(data));
+    }
+    return this;
+  }
+
+  update(
+    documentRef: DocumentReference<any>,
+    data: legacy.UpdateData
+  ): Transaction;
+  update(
+    documentRef: DocumentReference<any>,
+    field: string | FieldPath,
+    value: any,
+    ...moreFieldsAndValues: any[]
+  ): Transaction;
+  update(
+    documentRef: DocumentReference<any>,
+    dataOrField: any,
+    value?: any,
+    ...moreFieldsAndValues: any[]
+  ): Transaction {
+    if (arguments.length === 2) {
+      this._delegate.update(documentRef._delegate, unwrap(dataOrField));
+    } else {
+      this._delegate.update(
+        documentRef._delegate,
+        unwrap(dataOrField),
+        unwrap(value),
+        ...unwrap(moreFieldsAndValues)
+      );
+    }
+
+    return this;
+  }
+
+  delete(documentRef: DocumentReference<any>): Transaction {
+    this._delegate.delete(documentRef._delegate);
+    return this;
+  }
+}
+
+export class WriteBatch implements legacy.WriteBatch {
+  constructor(private readonly _delegate: exp.WriteBatch) {}
+
+  set<T>(
+    documentRef: DocumentReference<T>,
+    data: T,
+    options?: legacy.SetOptions
+  ): WriteBatch {
+    if (options) {
+      this._delegate.set(documentRef._delegate, unwrap(data), options);
+    } else {
+      this._delegate.set(documentRef._delegate, unwrap(data));
+    }
+    return this;
+  }
+
+  update(
+    documentRef: DocumentReference<any>,
+    data: legacy.UpdateData
+  ): WriteBatch;
+  update(
+    documentRef: DocumentReference<any>,
+    field: string | FieldPath,
+    value: any,
+    ...moreFieldsAndValues: any[]
+  ): WriteBatch;
+  update(
+    documentRef: DocumentReference<any>,
+    dataOrField: any,
+    value?: any,
+    ...moreFieldsAndValues: any[]
+  ): WriteBatch {
+    if (arguments.length === 2) {
+      this._delegate.update(documentRef._delegate, unwrap(dataOrField));
+    } else {
+      this._delegate.update(
+        documentRef._delegate,
+        unwrap(dataOrField),
+        unwrap(value),
+        ...unwrap(moreFieldsAndValues)
+      );
+    }
+
+    return this;
+  }
+
+  delete(documentRef: DocumentReference<any>): WriteBatch {
+    this._delegate.delete(documentRef._delegate);
+    return this;
+  }
+
+  commit(): Promise<void> {
+    return this._delegate.commit();
+  }
+}
+
+export class DocumentReference<T = legacy.DocumentData>
+  implements legacy.DocumentReference<T> {
+  constructor(readonly _delegate: exp.DocumentReference<T>) {}
+
+  readonly id = this._delegate.id;
+  readonly firestore = new FirebaseFirestore(this._delegate.firestore);
+  readonly path = this._delegate.path;
+
+  get parent(): legacy.CollectionReference<T> {
+    return new CollectionReference<T>(parent(this._delegate));
+  }
+
+  collection(
+    collectionPath: string
+  ): legacy.CollectionReference<legacy.DocumentData> {
+    return new CollectionReference(collection(this._delegate, collectionPath));
+  }
+
+  isEqual(other: DocumentReference<T>): boolean {
+    return refEqual(this._delegate, other._delegate);
+  }
+
+  set(data: Partial<T>, options?: legacy.SetOptions): Promise<void> {
+    if (options) {
+      return setDoc(this._delegate, unwrap(data), options);
+    } else {
+      return setDoc(this._delegate, unwrap(data));
+    }
+  }
+
+  update(data: legacy.UpdateData): Promise<void>;
+  update(
+    field: string | FieldPath,
+    value: any,
+    ...moreFieldsAndValues: any[]
+  ): Promise<void>;
+  update(
+    dataOrField: any,
+    value?: any,
+    ...moreFieldsAndValues: any[]
+  ): Promise<void> {
+    if (arguments.length === 1) {
+      return updateDoc(this._delegate, unwrap(dataOrField));
+    } else {
+      return updateDoc(
+        this._delegate,
+        unwrap(dataOrField),
+        unwrap(value),
+        ...unwrap(moreFieldsAndValues)
+      );
+    }
+  }
+
+  delete(): Promise<void> {
+    return deleteDoc(this._delegate);
+  }
+
+  get(options?: legacy.GetOptions): Promise<DocumentSnapshot<T>> {
+    let snap: Promise<exp.DocumentSnapshot<T>>;
+    if (options?.source === 'cache') {
+      snap = getDocFromCache(this._delegate);
+    } else if (options?.source === 'server') {
+      snap = getDocFromServer(this._delegate);
+    } else {
+      snap = getDoc(this._delegate);
+    }
+    return snap.then(result => new DocumentSnapshot(result));
+  }
+
+  onSnapshot(observer: {
+    next?: (snapshot: DocumentSnapshot<T>) => void;
+    error?: (error: legacy.FirestoreError) => void;
+    complete?: () => void;
+  }): () => void;
+  onSnapshot(
+    options: legacy.SnapshotListenOptions,
+    observer: {
+      next?: (snapshot: DocumentSnapshot<T>) => void;
+      error?: (error: Error) => void;
+      complete?: () => void;
+    }
+  ): () => void;
+  onSnapshot(
+    onNext: (snapshot: DocumentSnapshot<T>) => void,
+    onError?: (error: Error) => void,
+    onCompletion?: () => void
+  ): () => void;
+  onSnapshot(
+    options: legacy.SnapshotListenOptions,
+    onNext: (snapshot: DocumentSnapshot<T>) => void,
+    onError?: (error: Error) => void,
+    onCompletion?: () => void
+  ): () => void;
+  onSnapshot(...args: any): () => void {
+    const options = extractSnapshotOptions(args);
+    const observer = wrapObserver<DocumentSnapshot<T>, exp.DocumentSnapshot<T>>(
+      args,
+      snap => new DocumentSnapshot(snap)
+    );
+    return onSnapshot(this._delegate, options, observer);
+  }
+
+  withConverter<U>(
+    converter: legacy.FirestoreDataConverter<U>
+  ): DocumentReference<U> {
+    return new DocumentReference<U>(
+      this._delegate.withConverter(
+        converter as UntypedFirestoreDataConverter<U>
+      )
+    );
+  }
+}
+
+export class DocumentSnapshot<T = legacy.DocumentData>
+  implements legacy.DocumentSnapshot<T> {
+  constructor(readonly _delegate: exp.DocumentSnapshot<T>) {}
+
+  readonly ref = new DocumentReference<T>(this._delegate.ref);
+  readonly id = this._delegate.id;
+  readonly metadata = this._delegate.metadata;
+
+  get exists(): boolean {
+    return this._delegate.exists();
+  }
+
+  data(options?: legacy.SnapshotOptions): T | undefined {
+    return wrap(this._delegate.data(options));
+  }
+
+  get(fieldPath: string | FieldPath, options?: legacy.SnapshotOptions): any {
+    return wrap(this._delegate.get(unwrap(fieldPath), options));
+  }
+
+  isEqual(other: DocumentSnapshot<T>): boolean {
+    return snapshotEqual(this._delegate, other._delegate);
+  }
+}
+
+export class QueryDocumentSnapshot<T = legacy.DocumentData>
+  extends DocumentSnapshot<T>
+  implements legacy.QueryDocumentSnapshot<T> {
+  constructor(readonly _delegate: exp.QueryDocumentSnapshot<T>) {
+    super(_delegate);
+  }
+
+  data(options?: legacy.SnapshotOptions): T {
+    return this._delegate.data(options);
+  }
+}
+
+export class Query<T = legacy.DocumentData> implements legacy.Query<T> {
+  constructor(readonly _delegate: exp.Query<T>) {}
+
+  readonly firestore = new FirebaseFirestore(this._delegate.firestore);
+
+  where(
+    fieldPath: string | FieldPath,
+    opStr: legacy.WhereFilterOp,
+    value: any
+  ): Query<T> {
+    return new Query<T>(
+      this._delegate.where(unwrap(fieldPath), opStr, unwrap(value))
+    );
+  }
+
+  orderBy(
+    fieldPath: string | FieldPath,
+    directionStr?: legacy.OrderByDirection
+  ): Query<T> {
+    return new Query<T>(
+      this._delegate.orderBy(unwrap(fieldPath), directionStr)
+    );
+  }
+
+  limit(limit: number): Query<T> {
+    return new Query<T>(this._delegate.limit(limit));
+  }
+
+  limitToLast(limit: number): Query<T> {
+    return new Query<T>(this._delegate.limitToLast(limit));
+  }
+
+  startAt(...args: any[]): Query<T> {
+    if (args[0] instanceof DocumentSnapshot) {
+      return new Query(this._delegate.startAt(args[0]._delegate));
+    } else {
+      return new Query(this._delegate.startAt(...unwrap(args)));
+    }
+  }
+
+  startAfter(...args: any[]): Query<T> {
+    if (args[0] instanceof DocumentSnapshot) {
+      return new Query(this._delegate.startAfter(args[0]._delegate));
+    } else {
+      return new Query(this._delegate.startAfter(...unwrap(args)));
+    }
+  }
+
+  endBefore(...args: any[]): Query<T> {
+    if (args[0] instanceof DocumentSnapshot) {
+      return new Query(this._delegate.endBefore(args[0]._delegate));
+    } else {
+      return new Query(this._delegate.endBefore(...unwrap(args)));
+    }
+  }
+
+  endAt(...args: any[]): Query<T> {
+    if (args[0] instanceof DocumentSnapshot) {
+      return new Query(this._delegate.endAt(args[0]._delegate));
+    } else {
+      return new Query(this._delegate.endAt(...unwrap(args)));
+    }
+  }
+
+  isEqual(other: legacy.Query<T>): boolean {
+    return queryEqual(this._delegate, (other as Query<T>)._delegate);
+  }
+
+  get(options?: legacy.GetOptions): Promise<QuerySnapshot<T>> {
+    let query: Promise<exp.QuerySnapshot<T>>;
+    if (options?.source === 'cache') {
+      query = getQueryFromCache(this._delegate);
+    } else if (options?.source === 'server') {
+      query = getQueryFromServer(this._delegate);
+    } else {
+      query = getQuery(this._delegate);
+    }
+    return query.then(result => new QuerySnapshot(result));
+  }
+
+  onSnapshot(observer: {
+    next?: (snapshot: QuerySnapshot<T>) => void;
+    error?: (error: Error) => void;
+    complete?: () => void;
+  }): () => void;
+  onSnapshot(
+    options: legacy.SnapshotListenOptions,
+    observer: {
+      next?: (snapshot: QuerySnapshot<T>) => void;
+      error?: (error: Error) => void;
+      complete?: () => void;
+    }
+  ): () => void;
+  onSnapshot(
+    onNext: (snapshot: QuerySnapshot<T>) => void,
+    onError?: (error: Error) => void,
+    onCompletion?: () => void
+  ): () => void;
+  onSnapshot(
+    options: legacy.SnapshotListenOptions,
+    onNext: (snapshot: QuerySnapshot<T>) => void,
+    onError?: (error: Error) => void,
+    onCompletion?: () => void
+  ): () => void;
+  onSnapshot(...args: any): () => void {
+    const options = extractSnapshotOptions(args);
+    const observer = wrapObserver<QuerySnapshot<T>, exp.QuerySnapshot<T>>(
+      args,
+      snap => new QuerySnapshot(snap)
+    );
+    return onSnapshot(this._delegate, options, observer);
+  }
+
+  withConverter<U>(converter: legacy.FirestoreDataConverter<U>): Query<U> {
+    return new Query<U>(
+      this._delegate.withConverter(
+        converter as UntypedFirestoreDataConverter<U>
+      )
+    );
+  }
+}
+
+export class QuerySnapshot<T = legacy.DocumentData>
+  implements legacy.QuerySnapshot<T> {
+  constructor(readonly _delegate: exp.QuerySnapshot<T>) {}
+
+  readonly query = new Query(this._delegate.query);
+  readonly metadata = this._delegate.metadata;
+  readonly size = this._delegate.size;
+  readonly empty = this._delegate.empty;
+
+  get docs(): Array<QueryDocumentSnapshot<T>> {
+    return this._delegate.docs.map(doc => new QueryDocumentSnapshot<T>(doc));
+  }
+
+  docChanges(options?: legacy.SnapshotListenOptions): Array<DocumentChange<T>> {
+    return this._delegate
+      .docChanges(options)
+      .map(docChange => new DocumentChange<T>(docChange));
+  }
+
+  forEach(
+    callback: (result: QueryDocumentSnapshot<T>) => void,
+    thisArg?: any
+  ): void {
+    this._delegate.forEach(snapshot => {
+      callback.call(thisArg, new QueryDocumentSnapshot(snapshot));
+    });
+  }
+
+  isEqual(other: QuerySnapshot<T>): boolean {
+    return snapshotEqual(this._delegate, other._delegate);
+  }
+}
+
+export class DocumentChange<T = legacy.DocumentData>
+  implements legacy.DocumentChange<T> {
+  constructor(private readonly _delegate: exp.DocumentChange<T>) {}
+  readonly type = this._delegate.type;
+  readonly doc = new QueryDocumentSnapshot<T>(this._delegate.doc);
+  readonly oldIndex = this._delegate.oldIndex;
+  readonly newIndex = this._delegate.oldIndex;
+}
+
+export class CollectionReference<T = legacy.DocumentData> extends Query<T>
+  implements legacy.CollectionReference<T> {
+  constructor(readonly _delegate: exp.CollectionReference<T>) {
+    super(_delegate);
+  }
+
+  readonly id = this._delegate.id;
+  readonly path = this._delegate.path;
+
+  get parent(): DocumentReference<legacy.DocumentData> | null {
+    const docRef = parent(this._delegate);
+    return docRef ? new DocumentReference<legacy.DocumentData>(docRef) : null;
+  }
+
+  doc(documentPath?: string): DocumentReference<T> {
+    if (documentPath !== undefined) {
+      return new DocumentReference<T>(doc(this._delegate, documentPath));
+    } else {
+      return new DocumentReference<T>(doc(this._delegate));
+    }
+  }
+
+  add(data: T): Promise<DocumentReference<T>> {
+    return addDoc(this._delegate, unwrap(data)).then(
+      docRef => new DocumentReference(docRef)
+    );
+  }
+
+  isEqual(other: CollectionReference<T>): boolean {
+    return refEqual(this._delegate, other._delegate);
+  }
+
+  withConverter<U>(
+    converter: legacy.FirestoreDataConverter<U>
+  ): CollectionReference<U> {
+    return new CollectionReference<U>(
+      this._delegate.withConverter(
+        converter as UntypedFirestoreDataConverter<U>
+      )
+    );
+  }
+}
+
+export class FieldValue implements legacy.FieldValue {
+  constructor(readonly _delegate: exp.FieldValue) {}
+
+  static serverTimestamp(): FieldValue {
+    return new FieldValue(serverTimestamp());
+  }
+
+  static delete(): FieldValue {
+    return new FieldValue(deleteField());
+  }
+
+  static arrayUnion(...elements: any[]): FieldValue {
+    return new FieldValue(arrayUnion(...unwrap(elements)));
+  }
+
+  static arrayRemove(...elements: any[]): FieldValue {
+    return new FieldValue(arrayRemove(...unwrap(elements)));
+  }
+
+  static increment(n: number): FieldValue {
+    return new FieldValue(increment(n));
+  }
+
+  isEqual(other: FieldValue): boolean {
+    return this._delegate.isEqual(other._delegate);
+  }
+}
+
+export class FieldPath implements legacy.FieldPath {
+  private readonly fieldNames: string[];
+
+  constructor(...fieldNames: string[]) {
+    this.fieldNames = fieldNames;
+  }
+
+  get _delegate(): FieldPathExp {
+    return new FieldPathExp(...this.fieldNames);
+  }
+
+  static documentId(): FieldPath {
+    return new FieldPath('__name__');
+  }
+
+  isEqual(other: FieldPath): boolean {
+    throw new Error('isEqual() is not supported in shim');
+  }
+}
+
+/**
+ * Takes document data that uses the firestore-exp API types and replaces them
+ * with the API types defined in this shim.
+ */
+function wrap(value: any): any {
+  if (Array.isArray(value)) {
+    return value.map(v => wrap(v));
+  } else if (value instanceof FieldPathExp) {
+    return new FieldPath(...value._internalPath.toArray());
+  } else if (value instanceof DocumentReferenceExp) {
+    return new DocumentReference(value);
+  } else if (isPlainObject(value)) {
+    const obj: any = {};
+    for (const key in value) {
+      if (value.hasOwnProperty(key)) {
+        obj[key] = wrap(value[key]);
+      }
+    }
+    return obj;
+  } else {
+    return value;
+  }
+}
+
+/**
+ * Takes user data that uses API types from this shim and replaces them
+ * with the the firestore-exp API types.
+ */
+function unwrap(value: any): any {
+  if (Array.isArray(value)) {
+    return value.map(v => unwrap(v));
+  } else if (value instanceof FieldPath) {
+    return value._delegate;
+  } else if (value instanceof FieldValue) {
+    return value._delegate;
+  } else if (value instanceof DocumentReference) {
+    return value._delegate;
+  } else if (isPlainObject(value)) {
+    const obj: any = {};
+    for (const key in value) {
+      if (value.hasOwnProperty(key)) {
+        obj[key] = unwrap(value[key]);
+      }
+    }
+    return obj;
+  } else {
+    return value;
+  }
+}
+
+/**
+ * Creates an observer that can be passed to the firestore-exp SDK. The
+ * observer converts all observed values into the format expected by the shim.
+ *
+ * @param args The list of arguments from an `onSnapshot` call.
+ * @param wrapper The function that converts the firestore-exp type into the
+ * type used by this shim.
+ */
+function wrapObserver<ShimType, ExpType>(
+  args: any,
+  wrapper: (val: ExpType) => ShimType
+): PartialObserver<ExpType> {
+  let userObserver: PartialObserver<ShimType>;
+  if (isPartialObserver(args[0])) {
+    userObserver = args[0] as PartialObserver<ShimType>;
+  } else if (isPartialObserver(args[1])) {
+    userObserver = args[1];
+  } else if (typeof args[0] === 'function') {
+    userObserver = {
+      next: args[0],
+      error: args[1],
+      complete: args[2]
+    };
+  } else {
+    userObserver = {
+      next: args[1],
+      error: args[2],
+      complete: args[3]
+    };
+  }
+
+  return {
+    next: val => {
+      if (userObserver!.next) {
+        userObserver!.next(wrapper(val));
+      }
+    },
+    error: userObserver.error?.bind(userObserver),
+    complete: userObserver.complete?.bind(userObserver)
+  };
+}
+
+/**
+ * Iterates the list of arguments from an `onSnapshot` call and returns the
+ * first argument that may be an `SnapshotListenOptions` object. Returns an
+ * empty object if none is found.
+ */
+function extractSnapshotOptions(args: any): exp.SnapshotListenOptions {
+  for (const arg of args) {
+    if (typeof arg === 'object' && !isPartialObserver(arg)) {
+      return arg as exp.SnapshotListenOptions;
+    }
+  }
+  return {};
+}