diff --git a/packages/firebase/src/index.rn.ts b/packages/firebase/src/index.rn.ts
index b1e4c6dc083..c6e3c6f11bc 100644
--- a/packages/firebase/src/index.rn.ts
+++ b/packages/firebase/src/index.rn.ts
@@ -20,7 +20,10 @@ import { name, version } from '../package.json';
 
 import '../auth';
 import '../database';
+// TODO(b/158625454): Storage doesn't actually work by default in RN (it uses
+//  `atob`). We should provide a RN build that works out of the box.
 import '../storage';
+import '../firestore';
 
 firebase.registerVersion(name, version, 'rn');
 
diff --git a/packages/firestore/index.node.memory.ts b/packages/firestore/index.node.memory.ts
index d491d2a8dc1..1cfd55f8977 100644
--- a/packages/firestore/index.node.memory.ts
+++ b/packages/firestore/index.node.memory.ts
@@ -35,7 +35,7 @@ export function registerFirestore(instance: FirebaseNamespace): void {
     instance,
     (app, auth) => new Firestore(app, auth, new MemoryComponentProvider())
   );
-  instance.registerVersion(name, version);
+  instance.registerVersion(name, version, 'node');
 }
 
 registerFirestore(firebase);
diff --git a/packages/firestore/index.rn.memory.ts b/packages/firestore/index.rn.memory.ts
new file mode 100644
index 00000000000..803e7be3c73
--- /dev/null
+++ b/packages/firestore/index.rn.memory.ts
@@ -0,0 +1,42 @@
+/**
+ * @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 firebase from '@firebase/app';
+import { FirebaseNamespace } from '@firebase/app-types';
+
+import { Firestore } from './src/api/database';
+import { MemoryComponentProvider } from './src/core/component_provider';
+import { configureForFirebase } from './src/platform/config';
+
+import './register-module';
+import './src/platform_rn/rn_init';
+
+import { name, version } from './package.json';
+
+/**
+ * Registers the memory-only Firestore build for ReactNative with the components
+ * framework.
+ */
+export function registerFirestore(instance: FirebaseNamespace): void {
+  configureForFirebase(
+    instance,
+    (app, auth) => new Firestore(app, auth, new MemoryComponentProvider())
+  );
+  instance.registerVersion(name, version, 'rn');
+}
+
+registerFirestore(firebase);
diff --git a/packages/firestore/index.rn.ts b/packages/firestore/index.rn.ts
new file mode 100644
index 00000000000..3130be10374
--- /dev/null
+++ b/packages/firestore/index.rn.ts
@@ -0,0 +1,41 @@
+/**
+ * @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 firebase from '@firebase/app';
+import { FirebaseNamespace } from '@firebase/app-types';
+
+import { Firestore } from './src/api/database';
+import { IndexedDbComponentProvider } from './src/core/component_provider';
+import { configureForFirebase } from './src/platform/config';
+
+import './register-module';
+import './src/platform_rn/rn_init';
+
+import { name, version } from './package.json';
+
+/**
+ * Registers the main Firestore ReactNative build with the components framework.
+ * Persistence can be enabled via `firebase.firestore().enablePersistence()`.
+ */
+export function registerFirestore(instance: FirebaseNamespace): void {
+  configureForFirebase(
+    instance,
+    (app, auth) => new Firestore(app, auth, new IndexedDbComponentProvider())
+  );
+  instance.registerVersion(name, version, 'rn');
+}
+
+registerFirestore(firebase);
diff --git a/packages/firestore/memory/package.json b/packages/firestore/memory/package.json
index ac0df500a26..04a27eb839a 100644
--- a/packages/firestore/memory/package.json
+++ b/packages/firestore/memory/package.json
@@ -3,6 +3,7 @@
   "description": "A memory-only build of the Cloud Firestore JS SDK.",
   "main": "../dist/index.memory.node.cjs.js",
   "main-esm2017": "../dist/index.memory.node.esm2017.js",
+  "react-native": "../dist/index.memory.rn.esm2017.js",
   "browser": "../dist/index.memory.cjs.js",
   "module": "../dist/index.memory.esm.js",
   "esm2017": "../dist/index.memory.esm2017.js",
diff --git a/packages/firestore/package.json b/packages/firestore/package.json
index ba3e332455b..7018bf88ba4 100644
--- a/packages/firestore/package.json
+++ b/packages/firestore/package.json
@@ -41,6 +41,7 @@
   },
   "main": "dist/index.node.cjs.js",
   "main-esm2017": "dist/index.node.esm2017.js",
+  "react-native": "dist/index.rn.esm2017.js",
   "browser": "dist/index.cjs.js",
   "module": "dist/index.esm.js",
   "esm2017": "dist/index.esm2017.js",
diff --git a/packages/firestore/rollup.config.es2017.js b/packages/firestore/rollup.config.es2017.js
index fcabdabe0b1..9ef6e4fd326 100644
--- a/packages/firestore/rollup.config.es2017.js
+++ b/packages/firestore/rollup.config.es2017.js
@@ -100,6 +100,31 @@ const browserBuilds = [
   }
 ];
 
+const reactNativeBuilds = [
+  // Persistence build
+  {
+    input: 'index.rn.ts',
+    output: {
+      file: pkg['react-native'],
+      format: 'es',
+      sourcemap: true
+    },
+    plugins: browserBuildPlugins,
+    external: resolveBrowserExterns
+  },
+  // Memory-only build
+  {
+    input: 'index.rn.memory.ts',
+    output: {
+      file: path.resolve('./memory', memoryPkg['react-native']),
+      format: 'es',
+      sourcemap: true
+    },
+    plugins: browserBuildPlugins,
+    external: resolveBrowserExterns
+  }
+];
+
 // MARK: Node builds
 
 const nodeBuildPlugins = [
@@ -145,4 +170,4 @@ const nodeBuilds = [
   }
 ];
 
-export default [...browserBuilds, ...nodeBuilds];
+export default [...browserBuilds, ...reactNativeBuilds, ...nodeBuilds];
diff --git a/packages/firestore/src/platform_browser/browser_platform.ts b/packages/firestore/src/platform_browser/browser_platform.ts
index 38133db4df5..70a2dc9655c 100644
--- a/packages/firestore/src/platform_browser/browser_platform.ts
+++ b/packages/firestore/src/platform_browser/browser_platform.ts
@@ -19,7 +19,7 @@ import { DatabaseId, DatabaseInfo } from '../core/database_info';
 import { Platform } from '../platform/platform';
 import { Connection } from '../remote/connection';
 import { JsonProtoSerializer } from '../remote/serializer';
-import { ConnectivityMonitor } from './../remote/connectivity_monitor';
+import { ConnectivityMonitor } from '../remote/connectivity_monitor';
 
 import { NoopConnectivityMonitor } from '../remote/connectivity_monitor_noop';
 import { BrowserConnectivityMonitor } from './browser_connectivity_monitor';
@@ -27,13 +27,10 @@ import { WebChannelConnection } from './webchannel_connection';
 import { debugAssert } from '../util/assert';
 
 // Implements the Platform API for browsers and some browser-like environments
-// (including ReactNative).
+// (including ReactNative, which has its own ReactNativePlatform that extends
+// from this class).
 export class BrowserPlatform implements Platform {
-  readonly base64Available: boolean;
-
-  constructor() {
-    this.base64Available = typeof atob !== 'undefined';
-  }
+  readonly base64Available = typeof atob !== 'undefined';
 
   get document(): Document | null {
     // `document` is not always available, e.g. in ReactNative and WebWorkers.
diff --git a/packages/firestore/src/platform_rn/rn_init.ts b/packages/firestore/src/platform_rn/rn_init.ts
new file mode 100644
index 00000000000..442a86d079c
--- /dev/null
+++ b/packages/firestore/src/platform_rn/rn_init.ts
@@ -0,0 +1,28 @@
+/**
+ * @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 { PlatformSupport } from '../platform/platform';
+import { ReactNativePlatform } from './rn_platform';
+
+/**
+ * This code needs to run before Firestore is used. This can be achieved in
+ * several ways:
+ *   1) Through the JSCompiler compiling this code and then (automatically)
+ *      executing it before exporting the Firestore symbols.
+ *   2) Through importing this module first in a Firestore main module
+ */
+PlatformSupport.setPlatform(new ReactNativePlatform());
diff --git a/packages/firestore/src/platform_rn/rn_platform.ts b/packages/firestore/src/platform_rn/rn_platform.ts
new file mode 100644
index 00000000000..2ce9d9bfbd9
--- /dev/null
+++ b/packages/firestore/src/platform_rn/rn_platform.ts
@@ -0,0 +1,36 @@
+/**
+ * @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 { BrowserPlatform } from '../platform_browser/browser_platform';
+import { base64 } from '@firebase/util';
+
+// Implements the Platform API for ReactNative.
+export class ReactNativePlatform extends BrowserPlatform {
+  readonly base64Available = true;
+
+  atob(encoded: string): string {
+    // WebSafe uses a different URL-encoding safe alphabet that doesn't match
+    // the encoding used on the backend.
+    return base64.decodeString(encoded, /* webSafe =*/ false);
+  }
+
+  btoa(raw: string): string {
+    // WebSafe uses a different URL-encoding safe alphabet that doesn't match
+    // the encoding used on the backend.
+    return base64.encodeString(raw, /* webSafe =*/ false);
+  }
+}