add option to merge settings (#3464)

.changeset/mean-jokes-tan.md

@@ -0,0 +1,8 @@
+---
+'firebase': patch
+'@firebase/firestore': patch
+'@firebase/firestore-types': patch
+---
+feat: Added `merge` option to `firestore.settings()`, which merges the provided settings with
+settings from a previous call. This allows adding settings on top of the settings that were applied
+by `@firebase/testing`.

packages/firebase/index.d.ts

@@ -7891,10 +7891,18 @@ declare namespace firebase.firestore {
     /**
      * Whether to skip nested properties that are set to `undefined` during
      * object serialization. If set to `true`, these properties are skipped
-     * and not written to Firestore. If set `false` or omitted, the SDK throws
-     * an exception when it encounters properties of type `undefined`.
+     * and not written to Firestore. If set to `false` or omitted, the SDK
+     * throws an exception when it encounters properties of type `undefined`.
      */
     ignoreUndefinedProperties?: boolean;
+
+    /**
+     * Whether to merge the provided settings with the existing settings. If
+     * set to `true`, the settings are merged with existing settings. If
+     * set to `false` or left unset, the settings replace the existing
+     * settings.
+     */
+    merge?: boolean;
   }
 
   /**

packages/firestore-types/index.d.ts

@@ -30,6 +30,7 @@ export interface Settings {
   cacheSizeBytes?: number;
   experimentalForceLongPolling?: boolean;
   ignoreUndefinedProperties?: boolean;
+  merge?: boolean;
 }
 
 export interface PersistenceSettings {

packages/firestore/src/api/database.ts

@@ -160,7 +160,7 @@ class FirestoreSettings {
 
   readonly cacheSizeBytes: number;
 
-  readonly forceLongPolling: boolean;
+  readonly experimentalForceLongPolling: boolean;
 
   readonly ignoreUndefinedProperties: boolean;
 
@@ -263,7 +263,7 @@ class FirestoreSettings {
       'experimentalForceLongPolling',
       settings.experimentalForceLongPolling
     );
-    this.forceLongPolling =
+    this.experimentalForceLongPolling =
       settings.experimentalForceLongPolling ?? DEFAULT_FORCE_LONG_POLLING;
   }
 
@@ -274,7 +274,8 @@ class FirestoreSettings {
       this.timestampsInSnapshots === other.timestampsInSnapshots &&
       this.credentials === other.credentials &&
       this.cacheSizeBytes === other.cacheSizeBytes &&
-      this.forceLongPolling === other.forceLongPolling &&
+      this.experimentalForceLongPolling ===
+        other.experimentalForceLongPolling &&
       this.ignoreUndefinedProperties === other.ignoreUndefinedProperties
     );
   }
@@ -361,6 +362,12 @@ export class Firestore implements firestore.FirebaseFirestore, FirebaseService {
     validateExactNumberOfArgs('Firestore.settings', arguments, 1);
     validateArgType('Firestore.settings', 'object', 1, settingsLiteral);
 
+    if (settingsLiteral.merge) {
+      settingsLiteral = { ...this._settings, ...settingsLiteral };
+      // Remove the property from the settings once the merge is completed
+      delete settingsLiteral.merge;
+    }
+
     const newSettings = new FirestoreSettings(settingsLiteral);
     if (this._firestoreClient && !this._settings.isEqual(newSettings)) {
       throw new FirestoreError(
@@ -516,7 +523,7 @@ export class Firestore implements firestore.FirebaseFirestore, FirebaseService {
       this._persistenceKey,
       this._settings.host,
       this._settings.ssl,
-      this._settings.forceLongPolling
+      this._settings.experimentalForceLongPolling
     );
   }
 
@@ -681,6 +688,11 @@ export class Firestore implements firestore.FirebaseFirestore, FirebaseService {
   _areTimestampsInSnapshotsEnabled(): boolean {
     return this._settings.timestampsInSnapshots;
   }
+
+  // Visible for testing.
+  _getSettings(): firestore.Settings {
+    return this._settings;
+  }
 }
 
 /**

packages/firestore/test/integration/api/database.test.ts

@@ -1266,7 +1266,7 @@ apiDescribe('Database', (persistence: boolean) => {
     });
   });
 
-  it('calling terminate mutiple times should proceed', async () => {
+  it('calling terminate multiple times should proceed', async () => {
     await withTestDoc(persistence, async docRef => {
       const firestore = docRef.firestore;
       await firestore.terminate();

packages/firestore/test/unit/api/database.test.ts

@@ -19,10 +19,12 @@ import {
   collectionReference,
   documentReference,
   documentSnapshot,
+  newTestFirestore,
   query,
   querySnapshot
 } from '../../util/api_helpers';
 import { expectEqual, expectNotEqual, keys } from '../../util/helpers';
+import { expect } from 'chai';
 
 describe('CollectionReference', () => {
   it('support equality checking with isEqual()', () => {
@@ -153,3 +155,31 @@ describe('SnapshotMetadata', () => {
     );
   });
 });
+
+describe('Settings', () => {
+  it('replaces settings by default', () => {
+    // Use a new instance of Firestore in order to configure settings.
+    const firestoreClient = newTestFirestore();
+    firestoreClient.settings({ host: 'other.host' });
+    firestoreClient.settings({ ignoreUndefinedProperties: true });
+
+    expect(firestoreClient._getSettings().ignoreUndefinedProperties).to.be.true;
+    // Expect host to be replaced with default host.
+    expect(firestoreClient._getSettings().host).to.equal(
+      'firestore.googleapis.com'
+    );
+  });
+
+  it('can merge settings', () => {
+    // Use a new instance of Firestore in order to configure settings.
+    const firestoreClient = newTestFirestore();
+    firestoreClient.settings({ host: 'other.host' });
+    firestoreClient.settings({
+      ignoreUndefinedProperties: true,
+      merge: true
+    });
+
+    expect(firestoreClient._getSettings().ignoreUndefinedProperties).to.be.true;
+    expect(firestoreClient._getSettings().host).to.equal('other.host');
+  });
+});

packages/firestore/test/util/api_helpers.ts

@@ -65,6 +65,18 @@ export function firestore(): Firestore {
   return FIRESTORE;
 }
 
+export function newTestFirestore(): Firestore {
+  return new Firestore(
+    {
+      projectId: 'new-project',
+      database: '(default)'
+    },
+    new Provider('auth-internal', new ComponentContainer('default')),
+    offlineComponentProvider,
+    onlineComponentProvider
+  );
+}
+
 export function collectionReference(path: string): CollectionReference {
   const firestoreClient = firestore();
   // eslint-disable-next-line @typescript-eslint/no-floating-promises