diff --git a/.github/scripts/compare-types/packages/installations/config.ts b/.github/scripts/compare-types/packages/installations/config.ts
new file mode 100644
index 0000000000..4ec85fb7a7
--- /dev/null
+++ b/.github/scripts/compare-types/packages/installations/config.ts
@@ -0,0 +1,93 @@
+/**
+ * Known differences between the firebase-js-sdk @firebase/installations public
+ * API and the @react-native-firebase/installations modular API.
+ *
+ * Each entry must have a `name` (the export name) and a `reason` explaining
+ * why the difference exists. Any difference NOT listed here will cause CI to
+ * fail so that new drift is caught and deliberately acknowledged.
+ *
+ * Sections:
+ *  nameMapping     — exports that exist in both packages but under different names
+ *  missingInRN     — firebase-js-sdk exports absent from RN Firebase
+ *  extraInRN       — RN Firebase exports not present in the firebase-js-sdk
+ *  differentShape  — exports present in both but with differing signatures/members
+ */
+
+import type { PackageConfig } from '../../src/types';
+
+const config: PackageConfig = {
+  // ---------------------------------------------------------------------------
+  // Name mapping
+  // ---------------------------------------------------------------------------
+  nameMapping: {},
+
+  // ---------------------------------------------------------------------------
+  // Missing in RN Firebase
+  // ---------------------------------------------------------------------------
+  missingInRN: [
+    {
+      name: 'IdChangeCallbackFn',
+      reason:
+        'The firebase-js-sdk exports this type alias for the callback passed to ' +
+        '`onIdChange`. RN Firebase does not export it; the callback is typed inline. ' +
+        '`onIdChange` itself is present but throws at runtime (unsupported).',
+    },
+    {
+      name: 'IdChangeUnsubscribeFn',
+      reason:
+        'The firebase-js-sdk exports this type alias for the unsubscribe return of ' +
+        '`onIdChange`. RN Firebase does not export it; the return type is inline `() => void`. ' +
+        '`onIdChange` itself is present but throws at runtime (unsupported).',
+    },
+  ],
+
+  // ---------------------------------------------------------------------------
+  // Extra in RN Firebase
+  // ---------------------------------------------------------------------------
+  extraInRN: [
+    {
+      name: 'Statics',
+      reason:
+        'RN Firebase exposes a `Statics` interface (e.g. `SDK_VERSION`) for package ' +
+        'version and static metadata. The firebase-js-sdk does not expose an equivalent ' +
+        'named type in its public installations API.',
+    },
+    {
+      name: 'FirebaseInstallationsTypes',
+      reason:
+        'RN Firebase exports the deprecated `FirebaseInstallationsTypes` namespace for ' +
+        'backwards compatibility with the namespaced API. The firebase-js-sdk has no ' +
+        'equivalent; it only exposes the modular API.',
+    },
+  ],
+
+  // ---------------------------------------------------------------------------
+  // Different shape
+  // ---------------------------------------------------------------------------
+  differentShape: [
+    {
+      name: 'getInstallations',
+      reason:
+        'The optional `app` parameter is typed as `ReactNativeFirebase.FirebaseApp` in RN Firebase ' +
+        'and as `FirebaseApp` from `@firebase/app` in the firebase-js-sdk. Both represent the app ' +
+        'instance; the RN type comes from the React Native Firebase app package.',
+    },
+    {
+      name: 'Installations',
+      reason:
+        'The `app` property is typed as `ReactNativeFirebase.FirebaseApp` in RN Firebase ' +
+        'and as `FirebaseApp` from `@firebase/app` in the firebase-js-sdk. Both represent ' +
+        'the app instance; the RN type comes from the React Native Firebase app package.',
+    },
+    {
+      name: 'onIdChange',
+      reason:
+        'RN Firebase exposes `onIdChange` with the same signature as the firebase-js-sdk ' +
+        'for API compatibility, but it is not implemented: it throws at runtime with a message ' +
+        'that the method is unsupported. The JS SDK supports ID change callbacks; the native ' +
+        'RN implementations do not yet provide this.',
+    },
+  ],
+};
+
+export default config;
diff --git a/.github/scripts/compare-types/packages/installations/installations-js-sdk.d.ts b/.github/scripts/compare-types/packages/installations/installations-js-sdk.d.ts
new file mode 100644
index 0000000000..9d815fd1da
--- /dev/null
+++ b/.github/scripts/compare-types/packages/installations/installations-js-sdk.d.ts
@@ -0,0 +1,85 @@
+/**
+ * The Firebase Installations Web SDK.
+ * This SDK does not work in a Node.js environment.
+ *
+ * @packageDocumentation
+ */
+
+import { FirebaseApp } from '@firebase/app';
+
+/**
+ * Deletes the Firebase Installation and all associated data.
+ * @param installations - The `Installations` instance.
+ *
+ * @public
+ */
+export declare function deleteInstallations(installations: Installations): Promise<void>;
+
+/* Excluded from this release type: _FirebaseInstallationsInternal */
+
+/**
+ * Creates a Firebase Installation if there isn't one for the app and
+ * returns the Installation ID.
+ * @param installations - The `Installations` instance.
+ *
+ * @public
+ */
+export declare function getId(installations: Installations): Promise<string>;
+
+/**
+ * Returns an instance of {@link Installations} associated with the given
+ * {@link @firebase/app#FirebaseApp} instance.
+ * @param app - The {@link @firebase/app#FirebaseApp} instance.
+ *
+ * @public
+ */
+export declare function getInstallations(app?: FirebaseApp): Installations;
+
+/**
+ * Returns a Firebase Installations auth token, identifying the current
+ * Firebase Installation.
+ * @param installations - The `Installations` instance.
+ * @param forceRefresh - Force refresh regardless of token expiration.
+ *
+ * @public
+ */
+export declare function getToken(installations: Installations, forceRefresh?: boolean): Promise<string>;
+
+/**
+ * An user defined callback function that gets called when Installations ID changes.
+ *
+ * @public
+ */
+export declare type IdChangeCallbackFn = (installationId: string) => void;
+
+/**
+ * Unsubscribe a callback function previously added via {@link IdChangeCallbackFn}.
+ *
+ * @public
+ */
+export declare type IdChangeUnsubscribeFn = () => void;
+
+/**
+ * Public interface of the Firebase Installations SDK.
+ *
+ * @public
+ */
+export declare interface Installations {
+    /**
+     * The {@link @firebase/app#FirebaseApp} this `Installations` instance is associated with.
+     */
+    app: FirebaseApp;
+}
+
+/**
+ * Sets a new callback that will get called when Installation ID changes.
+ * Returns an unsubscribe function that will remove the callback when called.
+ * @param installations - The `Installations` instance.
+ * @param callback - The callback function that is invoked when FID changes.
+ * @returns A function that can be called to unsubscribe.
+ *
+ * @public
+ */
+export declare function onIdChange(installations: Installations, callback: IdChangeCallbackFn): IdChangeUnsubscribeFn;
+
+export { }
\ No newline at end of file
diff --git a/.github/scripts/compare-types/src/registry.ts b/.github/scripts/compare-types/src/registry.ts
index 30aac48c24..3a063657e8 100644
--- a/.github/scripts/compare-types/src/registry.ts
+++ b/.github/scripts/compare-types/src/registry.ts
@@ -50,5 +50,23 @@ function rnDist(packageName: string): string {
 }
 
 export const packages: PackageEntry[] = [
-
+  {
+    name: 'installations',
+    firebaseSdkTypesPath: path.join(
+      SCRIPT_DIR,
+      'packages',
+      'installations',
+      'installations-js-sdk.d.ts',
+    ),
+    rnFirebaseModularFiles: [
+      path.join(rnDist('installations'), 'types', 'installations.d.ts'),
+      path.join(rnDist('installations'), 'modular.d.ts'),
+    ],
+    rnFirebaseSupportFiles: [
+      path.join(rnDist('installations'), 'types', 'namespaced.d.ts'),
+      path.join(rnDist('installations'), 'types', 'internal.d.ts'),
+    ],
+    config: require(path.join(SCRIPT_DIR, 'packages', 'installations', 'config'))
+    .default as PackageConfig,
+  },
 ];
diff --git a/.github/scripts/compare-types/tsconfig.json b/.github/scripts/compare-types/tsconfig.json
index 82fc8523ad..e4fab5729c 100644
--- a/.github/scripts/compare-types/tsconfig.json
+++ b/.github/scripts/compare-types/tsconfig.json
@@ -7,7 +7,7 @@
     "esModuleInterop": true,
     "resolveJsonModule": true,
     "outDir": "dist",
-    "rootDir": "src"
+    "rootDir": "."
   },
   "include": ["src/**/*.ts", "packages/**/*.ts"]
 }
diff --git a/packages/installations/__tests__/installations.test.ts b/packages/installations/__tests__/installations.test.ts
index 8c76b1cd84..1a0f08203c 100644
--- a/packages/installations/__tests__/installations.test.ts
+++ b/packages/installations/__tests__/installations.test.ts
@@ -109,6 +109,7 @@ describe('installations()', function () {
       const installations = getInstallations();
       installationsV9Deprecation(
         () => deleteInstallations(installations),
+        // @ts-expect-error Combines modular and namespace API
         () => installations.delete(),
         'delete',
       );
@@ -118,6 +119,7 @@ describe('installations()', function () {
       const installations = getInstallations();
       installationsV9Deprecation(
         () => getId(installations),
+        // @ts-expect-error Combines modular and namespace API
         () => installations.getId(),
         'getId',
       );
@@ -127,6 +129,7 @@ describe('installations()', function () {
       const installations = getInstallations();
       installationsV9Deprecation(
         () => getToken(installations),
+        // @ts-expect-error Combines modular and namespace API
         () => installations.getToken(),
         'getToken',
       );
diff --git a/packages/installations/lib/index.d.ts b/packages/installations/lib/index.d.ts
deleted file mode 100644
index 47b4434dc0..0000000000
--- a/packages/installations/lib/index.d.ts
+++ /dev/null
@@ -1,173 +0,0 @@
-/*
- * Copyright (c) 2016-present Invertase Limited & Contributors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this library 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 { ReactNativeFirebase } from '@react-native-firebase/app';
-
-/**
- * Firebase Installations package for React Native.
- *
- * #### Example 1
- *
- * Access the firebase export from the `installations` package:
- *
- * ```js
- * import { firebase } from '@react-native-firebase/installations';
- *
- * // firebase.installations().X
- * ```
- *
- * #### Example 2
- *
- * Using the default export from the `installations` package:
- *
- * ```js
- * import installations from '@react-native-firebase/installations';
- *
- * // installations().X
- * ```
- *
- * #### Example 3
- *
- * Using the default export from the `app` package:
- *
- * ```js
- * import firebase from '@react-native-firebase/app';
- * import '@react-native-firebase/installations';
- *
- * // firebase.installations().X
- * ```
- *
- * @firebase installations
- */
-export namespace FirebaseInstallationsTypes {
-  import FirebaseModule = ReactNativeFirebase.FirebaseModule;
-
-  export interface Statics {
-    SDK_VERSION: string;
-  }
-
-  /**
-   * The Firebase Installations service is available for the default app or a given app.
-   *
-   * #### Example 1
-   *
-   * Get the installations instance for the **default app**:
-   *
-   * ```js
-   * const installationsForDefaultApp = firebase.installations();
-   * ```
-   *
-   * #### Example 2
-   *
-   * Get the installations instance for a **secondary app**:
-   *˚
-   * ```js
-   * const otherApp = firebase.app('otherApp');
-   * const installationsForOtherApp = firebase.installations(otherApp);
-   * ```
-   *
-   */
-  export class Module extends FirebaseModule {
-    /**
-     * The current `FirebaseApp` instance for this Firebase service.
-     */
-    app: ReactNativeFirebase.FirebaseApp;
-
-    /**
-     * Creates a Firebase Installation if there isn't one for the app and
-     * returns the Installation ID. The installation ID is a globally unique,
-     * stable, URL-safe base64 string identifier that uniquely identifies the app instance.
-     * NOTE: If the application already has an existing FirebaseInstanceID then the InstanceID identifier will be used.
-     *
-     * @return Firebase Installation ID, this is an url-safe base64 string of a 128-bit integer.
-     */
-    getId(): Promise<string>;
-
-    /**
-     * Retrieves (locally or from the server depending on forceRefresh value) a valid installation auth token.
-     * An existing token may be invalidated or expire, so it is recommended to fetch the installation auth token
-     * before any request to external servers (it will be refreshed automatically for firebase API calls).
-     * This method should be used with forceRefresh == YES when e.g. a request with the previously fetched
-     * installation auth token failed with “Not Authorized” error.
-     *
-     * @param forceRefresh Options to get an auth token either by force refreshing or not.
-     * @return Firebase Installation Authentication Token
-     */
-    getToken(forceRefresh?: boolean): Promise<string>;
-
-    /**
-     * Deletes the Firebase Installation and all associated data from the Firebase backend.
-     * This call may cause Firebase Cloud Messaging, Firebase Remote Config, Firebase Predictions,
-     * or Firebase In-App Messaging to not function properly. Fetching a new installations ID should
-     * reset all the dependent services to a stable state again. A network connection is required
-     * for the method to succeed. If it fails, the existing installation data remains untouched.
-     */
-    delete(): Promise<void>;
-
-    /**
-     * TODO implement id change listener for android.
-     *
-     * Sets a new callback that will get called when Installation ID changes.
-     * Returns an unsubscribe function that will remove the callback when called.
-     * Only the Android SDK supports sending ID change events.
-     *
-     * @android
-     */
-    // onIdChange(callback: (installationId: string) => void): () => void;
-  }
-}
-
-type InstallationsNamespace = ReactNativeFirebase.FirebaseModuleWithStaticsAndApp<
-  FirebaseInstallationsTypes.Module,
-  FirebaseInstallationsTypes.Statics
-> & {
-  firebase: ReactNativeFirebase.Module;
-  app(name?: string): ReactNativeFirebase.FirebaseApp;
-};
-
-declare const defaultExport: InstallationsNamespace;
-
-export const firebase: ReactNativeFirebase.Module & {
-  installations: typeof defaultExport;
-  app(
-    name?: string,
-  ): ReactNativeFirebase.FirebaseApp & { installations(): FirebaseInstallationsTypes.Module };
-};
-
-export * from './modular';
-
-export default defaultExport;
-
-/**
- * Attach namespace to `firebase.` and `FirebaseApp.`.
- */
-declare module '@react-native-firebase/app' {
-  namespace ReactNativeFirebase {
-    import FirebaseModuleWithStaticsAndApp = ReactNativeFirebase.FirebaseModuleWithStaticsAndApp;
-
-    interface Module {
-      installations: FirebaseModuleWithStaticsAndApp<
-        FirebaseInstallationsTypes.Module,
-        FirebaseInstallationsTypes.Statics
-      >;
-    }
-
-    interface FirebaseApp {
-      installations(): FirebaseInstallationsTypes.Module;
-    }
-  }
-}
diff --git a/packages/installations/lib/index.ts b/packages/installations/lib/index.ts
new file mode 100644
index 0000000000..c7492a400a
--- /dev/null
+++ b/packages/installations/lib/index.ts
@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2016-present Invertase Limited & Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this library 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.
+ *
+ */
+
+// Export types from types/installations (public/modular API; Statics re-exported via modular)
+export type { Installations } from './types/installations';
+export type { FirebaseInstallationsTypes } from './types/namespaced';
+
+// Export modular API functions
+export * from './modular';
+
+// Export namespaced API
+export * from './namespaced';
+export { default } from './namespaced';
diff --git a/packages/installations/lib/modular.ts b/packages/installations/lib/modular.ts
new file mode 100644
index 0000000000..474147fd94
--- /dev/null
+++ b/packages/installations/lib/modular.ts
@@ -0,0 +1,62 @@
+import { getApp } from '@react-native-firebase/app';
+import { MODULAR_DEPRECATION_ARG } from '@react-native-firebase/app/dist/module/common';
+import type { ReactNativeFirebase } from '@react-native-firebase/app';
+import type { Installations } from './types/installations';
+import type { InstallationsInternal, WithModularDeprecationArg } from './types/internal';
+
+export type { Statics } from './types/installations';
+
+/**
+ * Returns an instance of Installations associated with the given FirebaseApp instance.
+ */
+export function getInstallations(app?: ReactNativeFirebase.FirebaseApp): Installations {
+  if (app) {
+    return getApp(app.name).installations() as Installations;
+  }
+  return getApp().installations() as Installations;
+}
+
+/**
+ * Deletes the Firebase Installation and all associated data.
+ */
+export function deleteInstallations(installations: Installations): Promise<void> {
+  return (
+    (installations as InstallationsInternal).delete as WithModularDeprecationArg<
+      InstallationsInternal['delete']
+    >
+  ).call(installations, MODULAR_DEPRECATION_ARG);
+}
+
+/**
+ * Creates a Firebase Installation if there isn't one for the app and returns the Installation ID.
+ */
+export function getId(installations: Installations): Promise<string> {
+  return (
+    (installations as InstallationsInternal).getId as WithModularDeprecationArg<
+      InstallationsInternal['getId']
+    >
+  ).call(installations, MODULAR_DEPRECATION_ARG);
+}
+
+/**
+ * Returns a Firebase Installations auth token, identifying the current Firebase Installation.
+ */
+export function getToken(installations: Installations, forceRefresh?: boolean): Promise<string> {
+  return (
+    (installations as InstallationsInternal).getToken as WithModularDeprecationArg<
+      InstallationsInternal['getToken']
+    >
+  ).call(installations, forceRefresh, MODULAR_DEPRECATION_ARG);
+}
+
+/**
+ * Throw an error since react-native-firebase does not support this method.
+ *
+ * Sets a new callback that will get called when Installation ID changes. Returns an unsubscribe function that will remove the callback when called.
+ */
+export function onIdChange(
+  _installations: Installations,
+  _callback: (installationId: string) => void,
+): () => void {
+  throw new Error('onIdChange() is unsupported by the React Native Firebase SDK.');
+}
diff --git a/packages/installations/lib/modular/index.d.ts b/packages/installations/lib/modular/index.d.ts
deleted file mode 100644
index 8e493590ac..0000000000
--- a/packages/installations/lib/modular/index.d.ts
+++ /dev/null
@@ -1,41 +0,0 @@
-import { ReactNativeFirebase } from '@react-native-firebase/app';
-import { FirebaseInstallationsTypes } from '../index';
-
-import FirebaseInstallations = FirebaseInstallationsTypes.Module;
-/**
- * Returns an instance of Installations associated with the given FirebaseApp instance.
- */
-export declare function getInstallations(
-  app?: ReactNativeFirebase.FirebaseApp,
-): FirebaseInstallations;
-
-/**
- * Deletes the Firebase Installation and all associated data.
- */
-export declare function deleteInstallations(installations?: FirebaseInstallations): Promise<void>;
-
-/**
- * Creates a Firebase Installation if there isn't one for the app and returns the Installation ID.
- */
-export declare function getId(installations: FirebaseInstallations): Promise<string>;
-
-/**
- * Returns a Firebase Installations auth token, identifying the current Firebase Installation.
- */
-export declare function getToken(
-  installations: FirebaseInstallations,
-  forceRefresh?: boolean,
-): Promise<string>;
-
-declare type IdChangeCallbackFn = (installationId: string) => void;
-declare type IdChangeUnsubscribeFn = () => void;
-
-/**
- * Throw an error since react-native-firebase does not support this method.
- *
- * Sets a new callback that will get called when Installation ID changes. Returns an unsubscribe function that will remove the callback when called.
- */
-export declare function onIdChange(
-  installations: FirebaseInstallations,
-  callback: IdChangeCallbackFn,
-): IdChangeUnsubscribeFn;
diff --git a/packages/installations/lib/modular/index.js b/packages/installations/lib/modular/index.js
deleted file mode 100644
index 85a7a279b8..0000000000
--- a/packages/installations/lib/modular/index.js
+++ /dev/null
@@ -1,63 +0,0 @@
-/*
- * Copyright (c) 2016-present Invertase Limited & Contributors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this library 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 { getApp } from '@react-native-firebase/app';
-import { MODULAR_DEPRECATION_ARG } from '@react-native-firebase/app/dist/module/common';
-/**
- * @typedef {import('..').FirebaseInstallationsTypes.Module} FirebaseInstallation
- */
-
-export function getInstallations(app) {
-  if (app) {
-    return getApp(app.name).installations();
-  }
-  return getApp().installations();
-}
-
-/**
- * @param {FirebaseInstallation} installations
- * @returns {Promise<void>}
- */
-export function deleteInstallations(installations) {
-  return installations.delete.call(installations, MODULAR_DEPRECATION_ARG);
-}
-
-/**
- * @param {FirebaseInstallation} installations
- * @returns {Promise<string>}
- */
-export function getId(installations) {
-  return installations.getId.call(installations, MODULAR_DEPRECATION_ARG);
-}
-
-/**
- * @param {FirebaseInstallation} installations
- * @param {boolean | undefined} forceRefresh
- * @returns {Promise<string>}
- */
-export function getToken(installations, forceRefresh) {
-  return installations.getToken.call(installations, forceRefresh, MODULAR_DEPRECATION_ARG);
-}
-
-/**
- * @param {FirebaseInstallation} installations
- * @param {(string) => void} callback
- * @returns {() => void}
- */
-export function onIdChange(_installations, _callback) {
-  throw new Error('onIdChange() is unsupported by the React Native Firebase SDK.');
-}
diff --git a/packages/installations/lib/index.js b/packages/installations/lib/namespaced.ts
similarity index 50%
rename from packages/installations/lib/index.js
rename to packages/installations/lib/namespaced.ts
index 65deb37618..43a431d819 100644
--- a/packages/installations/lib/index.js
+++ b/packages/installations/lib/namespaced.ts
@@ -16,26 +16,39 @@
  */
 
 import { isIOS } from '@react-native-firebase/app/dist/module/common';
+import type { ReactNativeFirebase } from '@react-native-firebase/app';
 import {
   createModuleNamespace,
   FirebaseModule,
   getFirebaseRoot,
 } from '@react-native-firebase/app/dist/module/internal';
+import type { ModuleConfig } from '@react-native-firebase/app/dist/module/internal';
 
-import version from './version';
+import { version } from './version';
+import type { FirebaseInstallationsTypes } from './types/namespaced';
 
-const statics = {};
+const statics: FirebaseInstallationsTypes.Statics = {
+  SDK_VERSION: version,
+};
 
 const namespace = 'installations';
 
-const nativeModuleName = 'RNFBInstallationsModule';
+const nativeModuleName = 'RNFBInstallationsModule' as const;
 
-class FirebaseInstallationsModule extends FirebaseModule {
-  getId() {
+class FirebaseInstallationsModule extends FirebaseModule<typeof nativeModuleName> {
+  constructor(
+    app: ReactNativeFirebase.FirebaseAppBase,
+    config: ModuleConfig,
+    customUrlOrRegion?: string | null,
+  ) {
+    super(app, config, customUrlOrRegion);
+  }
+
+  getId(): Promise<string> {
     return this.native.getId();
   }
 
-  getToken(forceRefresh) {
+  getToken(forceRefresh?: boolean): Promise<string> {
     if (!forceRefresh) {
       return this.native.getToken(false);
     } else {
@@ -43,12 +56,13 @@ class FirebaseInstallationsModule extends FirebaseModule {
     }
   }
 
-  delete() {
+  delete(): Promise<void> {
     return this.native.delete();
   }
 
-  onIdChange() {
+  onIdChange(_callback: (installationId: string) => void): () => void {
     if (isIOS) {
+      // iOS doesn't support ID change events, return empty unsubscribe function
       return () => {};
     }
 
@@ -58,11 +72,11 @@ class FirebaseInstallationsModule extends FirebaseModule {
 }
 
 // import { SDK_VERSION } from '@react-native-firebase/installations';
-export const SDK_VERSION = version;
+export const SDK_VERSION: string = version;
 
 // import installations from '@react-native-firebase/installations';
 // installations().X(...);
-export default createModuleNamespace({
+const installationsNamespace = createModuleNamespace({
   statics,
   version,
   namespace,
@@ -73,9 +87,27 @@ export default createModuleNamespace({
   ModuleClass: FirebaseInstallationsModule,
 });
 
+type InstallationsNamespace = ReactNativeFirebase.FirebaseModuleWithStaticsAndApp<
+  FirebaseInstallationsTypes.Module,
+  FirebaseInstallationsTypes.Statics
+> & {
+  installations: ReactNativeFirebase.FirebaseModuleWithStaticsAndApp<
+    FirebaseInstallationsTypes.Module,
+    FirebaseInstallationsTypes.Statics
+  >;
+  firebase: ReactNativeFirebase.Module;
+  app(name?: string): ReactNativeFirebase.FirebaseApp;
+};
+
+export default installationsNamespace as unknown as InstallationsNamespace;
+
 // import installations, { firebase } from '@react-native-firebase/installations';
 // installations().X(...);
 // firebase.installations().X(...);
-export const firebase = getFirebaseRoot();
-
-export * from './modular';
+export const firebase =
+  getFirebaseRoot() as unknown as ReactNativeFirebase.FirebaseNamespacedExport<
+    'installations',
+    FirebaseInstallationsTypes.Module,
+    FirebaseInstallationsTypes.Statics,
+    false
+  >;
diff --git a/packages/installations/lib/types/installations.ts b/packages/installations/lib/types/installations.ts
new file mode 100644
index 0000000000..1ff071e28a
--- /dev/null
+++ b/packages/installations/lib/types/installations.ts
@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2016-present Invertase Limited & Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this library 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 type { ReactNativeFirebase } from '@react-native-firebase/app';
+
+// ============ Statics Interface ============
+
+export interface Statics {
+  SDK_VERSION: string;
+}
+
+// ============ Module Interface (public/modular API) ============
+
+/**
+ * The Firebase Installations service interface (modular/public API).
+ * Only exposes the app reference; use modular functions or the internal type for methods.
+ *
+ * > This module is available for the default app or a given app.
+ *
+ * #### Example
+ *
+ * Get the installations instance for the default app:
+ *
+ * ```js
+ * const defaultInstallations = getInstallations();
+ * ```
+ */
+export interface Installations {
+  /** The FirebaseApp this module is associated with */
+  app: ReactNativeFirebase.FirebaseApp;
+}
diff --git a/packages/installations/lib/types/internal.ts b/packages/installations/lib/types/internal.ts
new file mode 100644
index 0000000000..6f0bf74a3d
--- /dev/null
+++ b/packages/installations/lib/types/internal.ts
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2016-present Invertase Limited & Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this library 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 type { Installations } from './installations';
+
+/**
+ * Wraps a method type so it accepts MODULAR_DEPRECATION_ARG as a trailing argument.
+ * Allows modular wrappers to use .call(instance, ...args, MODULAR_DEPRECATION_ARG) without changing internal types.
+ */
+export type WithModularDeprecationArg<T extends (...args: any[]) => any> = T extends (
+  ...args: infer A
+) => infer R
+  ? (...args: [...A, unknown?]) => R
+  : never;
+
+/**
+ * Wrapped native module interface for Installations.
+ */
+export interface RNFBInstallationsModule {
+  getId(): Promise<string>;
+  getToken(forceRefresh: boolean): Promise<string>;
+  delete(): Promise<void>;
+}
+
+declare module '@react-native-firebase/app/dist/module/internal/NativeModules' {
+  interface ReactNativeFirebaseNativeModules {
+    RNFBInstallationsModule: RNFBInstallationsModule;
+  }
+}
+
+/**
+ * Internal Installations type with access to instance methods.
+ * Used by namespaced implementation and modular wrappers; not part of the public modular API.
+ */
+export type InstallationsInternal = Installations & {
+  getId(): Promise<string>;
+  getToken(forceRefresh?: boolean): Promise<string>;
+  delete(): Promise<void>;
+  onIdChange(callback: (installationId: string) => void): () => void;
+};
diff --git a/packages/installations/lib/types/namespaced.ts b/packages/installations/lib/types/namespaced.ts
new file mode 100644
index 0000000000..ff9ee8c94e
--- /dev/null
+++ b/packages/installations/lib/types/namespaced.ts
@@ -0,0 +1,111 @@
+/*
+ * Copyright (c) 2016-present Invertase Limited & Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this library 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 type { ReactNativeFirebase } from '@react-native-firebase/app';
+
+/**
+ * Firebase Installations package for React Native.
+ *
+ * @firebase installations
+ */
+
+type FirebaseModule = ReactNativeFirebase.FirebaseModule;
+
+/**
+ * @deprecated Use the exported types directly instead.
+ * FirebaseInstallationsTypes namespace is kept for backwards compatibility.
+ */
+/* eslint-disable @typescript-eslint/no-namespace */
+export namespace FirebaseInstallationsTypes {
+  /**
+   * Cloud Installations statics.
+   *
+   * @deprecated Use the exported types directly instead. FirebaseInstallationsTypes namespace is kept for backwards compatibility.
+   */
+  export interface Statics {
+    SDK_VERSION: string;
+  }
+
+  /**
+   * The Firebase Installations service is available for the default app or a given app.
+   *
+   * @deprecated Use the modular API (getInstallations, getId, getToken, delete) and types from '@react-native-firebase/installations' instead.
+   * FirebaseInstallationsTypes namespace is kept for backwards compatibility.
+   *
+   * #### Example
+   *
+   * Get the Installations instance for the **default app**:
+   *
+   * ```js
+   * const defaultInstallations = firebase.installations();
+   * ```
+   */
+  export interface Module extends FirebaseModule {
+    /**
+     * The current `FirebaseApp` instance for this Firebase service.
+     *
+     * @deprecated Use the modular API instead.
+     */
+    app: ReactNativeFirebase.FirebaseApp;
+
+    /**
+     * Creates a Firebase Installation if there isn't one for the app and returns the Installation ID.
+     *
+     * @deprecated Use the modular `getId(installations)` instead.
+     */
+    getId(): Promise<string>;
+
+    /**
+     * Retrieves a valid installation auth token.
+     *
+     * @deprecated Use the modular `getToken(installations, forceRefresh)` instead.
+     */
+    getToken(forceRefresh?: boolean): Promise<string>;
+
+    /**
+     * Deletes the Firebase Installation and all associated data from the Firebase backend.
+     *
+     * @deprecated Use the modular `deleteInstallations(installations)` instead.
+     */
+    delete(): Promise<void>;
+
+    /**
+     * Sets a new callback that will get called when Installation ID changes. Returns an unsubscribe function.
+     *
+     * @deprecated Not supported by React Native Firebase; use modular API for alternatives.
+     */
+    onIdChange(callback: (installationId: string) => void): () => void;
+  }
+}
+/* eslint-enable @typescript-eslint/no-namespace */
+
+/* eslint-disable @typescript-eslint/no-namespace */
+declare module '@react-native-firebase/app' {
+  namespace ReactNativeFirebase {
+    import FirebaseModuleWithStaticsAndApp = ReactNativeFirebase.FirebaseModuleWithStaticsAndApp;
+    interface Module {
+      installations: FirebaseModuleWithStaticsAndApp<
+        FirebaseInstallationsTypes.Module,
+        FirebaseInstallationsTypes.Statics
+      >;
+    }
+    interface FirebaseApp {
+      installations(): FirebaseInstallationsTypes.Module;
+    }
+  }
+}
+/* eslint-enable @typescript-eslint/no-namespace */
diff --git a/packages/installations/package.json b/packages/installations/package.json
index 27da50cd1b..955d305819 100644
--- a/packages/installations/package.json
+++ b/packages/installations/package.json
@@ -3,12 +3,13 @@
   "version": "23.8.6",
   "author": "Invertase <oss@invertase.io> (http://invertase.io)",
   "description": "React Native Firebase - Installations",
-  "main": "lib/index.js",
-  "types": "lib/index.d.ts",
+  "main": "./dist/module/index.js",
+  "types": "./dist/typescript/lib/index.d.ts",
   "scripts": {
-    "build": "genversion --semi lib/version.js",
+    "build": "genversion --esm --semi lib/version.ts",
     "build:clean": "rimraf android/build && rimraf ios/build",
-    "prepare": "yarn run build"
+    "compile": "bob build",
+    "prepare": "yarn run build && yarn compile"
   },
   "repository": {
     "type": "git",
@@ -24,6 +25,39 @@
   "peerDependencies": {
     "@react-native-firebase/app": "23.8.6"
   },
+  "devDependencies": {
+    "react-native-builder-bob": "^0.40.17"
+  },
+  "exports": {
+    ".": {
+      "source": "./lib/index.ts",
+      "types": "./dist/typescript/lib/index.d.ts",
+      "default": "./dist/module/index.js"
+    },
+    "./package.json": "./package.json"
+  },
+  "react-native-builder-bob": {
+    "source": "lib",
+    "output": "dist",
+    "targets": [
+      [
+        "module",
+        {
+          "esm": true
+        }
+      ],
+      [
+        "typescript",
+        {
+          "tsc": "../../node_modules/.bin/tsc"
+        }
+      ]
+    ]
+  },
+  "eslintIgnore": [
+    "node_modules/",
+    "dist/"
+  ],
   "publishConfig": {
     "access": "public",
     "provenance": true
diff --git a/packages/installations/tsconfig.json b/packages/installations/tsconfig.json
new file mode 100644
index 0000000000..d23f0c8b5a
--- /dev/null
+++ b/packages/installations/tsconfig.json
@@ -0,0 +1,21 @@
+{
+  "extends": "../../tsconfig.packages.base.json",
+  "compilerOptions": {
+    "baseUrl": ".",
+    "rootDir": ".",
+    "paths": {
+      "@react-native-firebase/app/dist/module/common/*": ["../app/dist/typescript/lib/common/*"],
+      "@react-native-firebase/app/dist/module/common": ["../app/dist/typescript/lib/common"],
+      "@react-native-firebase/app/dist/module/internal/web/*": [
+        "../app/dist/typescript/lib/internal/web/*"
+      ],
+      "@react-native-firebase/app/dist/module/internal/*": [
+        "../app/dist/typescript/lib/internal/*"
+      ],
+      "@react-native-firebase/app/dist/module/internal": ["../app/dist/typescript/lib/internal"],
+      "@react-native-firebase/app": ["../app/dist/typescript/lib"]
+    }
+  },
+  "include": ["lib/**/*", "../app/lib/internal/global.d.ts"],
+  "exclude": ["node_modules", "dist", "__tests__", "**/*.test.ts"]
+}
diff --git a/packages/installations/type-test.ts b/packages/installations/type-test.ts
index 3df090f8b3..6263a78e89 100644
--- a/packages/installations/type-test.ts
+++ b/packages/installations/type-test.ts
@@ -1,5 +1,6 @@
 import installations, {
   firebase,
+  FirebaseInstallationsTypes,
   getInstallations,
   deleteInstallations,
   getId,
@@ -33,7 +34,7 @@ console.log(installations(firebase.app()).app.name);
 console.log(installations(firebase.app('foo')).app.name);
 
 // checks Module instance APIs
-const installationsInstance = firebase.installations();
+const installationsInstance = firebase.installations() as unknown as FirebaseInstallationsTypes.Module;
 console.log(installationsInstance.app.name);
 
 installationsInstance.getId().then((id: string) => {
diff --git a/tsconfig.json b/tsconfig.json
index 0658ab77a9..dd46a78f7a 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -4,7 +4,7 @@
     "packages/app-check/lib/index.d.ts",
     "packages/app-check/lib/modular/index.d.ts",
     "packages/app-distribution/lib/index.d.ts",
-    "packages/app-distribution/lib/modular/index.d.ts",
+    "packages/app-distribution/lib/modular.d.ts",
     "packages/app/lib/internal/global.d.ts",
     "packages/app/lib/internal/web/memidb/index.d.ts",
     "packages/auth/lib/index.d.ts",
@@ -27,8 +27,6 @@
     "packages/firestore/lib/modular/VectorValue.d.ts",
     "packages/in-app-messaging/lib/index.d.ts",
     "packages/in-app-messaging/lib/modular/index.d.ts",
-    "packages/installations/lib/index.d.ts",
-    "packages/installations/lib/modular/index.d.ts",
     "packages/ml/lib/index.d.ts",
     "packages/ml/lib/modular/index.d.ts",
     "packages/perf/lib/index.d.ts",
@@ -76,7 +74,13 @@
     "lib": ["es2015", "es2016", "esnext", "dom"],
     "types": ["react-native", "node"],
     "paths": {
-      "@react-native-firebase/*": ["./packages/*/lib/index.d.ts"]
+      "@react-native-firebase/*": ["./packages/*/lib/index.d.ts"],
+      "@react-native-firebase/app": ["./packages/app/dist/typescript/lib"],
+      "@react-native-firebase/app/dist/module/common": ["./packages/app/dist/typescript/lib/common"],
+      "@react-native-firebase/app/dist/module/common/*": ["./packages/app/dist/typescript/lib/common/*"],
+      "@react-native-firebase/app/dist/module/internal": ["./packages/app/dist/typescript/lib/internal"],
+      "@react-native-firebase/app/dist/module/internal/*": ["./packages/app/dist/typescript/lib/internal/*"],
+      "@react-native-firebase/app/dist/module/internal/web/*": ["./packages/app/dist/typescript/lib/internal/web/*"]
     }
   },
   "exclude": ["node_modules", "**/*.spec.ts", "packages/**/dist"]
diff --git a/yarn.lock b/yarn.lock
index e4be9a3184..572a6ce733 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5903,6 +5903,8 @@ __metadata:
 "@react-native-firebase/installations@npm:23.8.6, @react-native-firebase/installations@workspace:packages/installations":
   version: 0.0.0-use.local
   resolution: "@react-native-firebase/installations@workspace:packages/installations"
+  dependencies:
+    react-native-builder-bob: "npm:^0.40.17"
   peerDependencies:
     "@react-native-firebase/app": 23.8.6
   languageName: unknown