diff --git a/packages/app-check-interop-types/index.d.ts b/packages/app-check-interop-types/index.d.ts
index cc16c5e4680..504c63c5819 100644
--- a/packages/app-check-interop-types/index.d.ts
+++ b/packages/app-check-interop-types/index.d.ts
@@ -34,10 +34,10 @@ export interface FirebaseAppCheckInternal {
   removeTokenListener(listener: AppCheckTokenListener): void;
 }
 
-type AppCheckTokenListener = (token: AppCheckTokenResult) => void;
+export type AppCheckTokenListener = (token: AppCheckTokenResult) => void;
 
 // If the error field is defined, the token field will be populated with a dummy token
-interface AppCheckTokenResult {
+export interface AppCheckTokenResult {
   readonly token: string;
   readonly error?: Error;
 }
diff --git a/packages/firebase/.gitignore b/packages/firebase/.gitignore
index 228443ec909..ea616f7f428 100644
--- a/packages/firebase/.gitignore
+++ b/packages/firebase/.gitignore
@@ -1,4 +1,6 @@
 /firebase*.js
 /firebase*.map
 /firebase*.gz
-/firebase*.tgz
\ No newline at end of file
+/firebase*.tgz
+/custom/*.d.ts
+/packages
\ No newline at end of file
diff --git a/packages/firebase/custom/analytics-remote-config.ts b/packages/firebase/custom/analytics-remote-config.ts
new file mode 100644
index 00000000000..db11a53fd3f
--- /dev/null
+++ b/packages/firebase/custom/analytics-remote-config.ts
@@ -0,0 +1,23 @@
+/**
+ * @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 { registerVersion } from '@firebase/app';
+import { version } from '../package.json';
+
+export * as app from '@firebase/app';
+export * as analytics from '@firebase/analytics';
+export * as remoteConfig from '@firebase/remote-config';
diff --git a/packages/firebase/custom/index.all.ts b/packages/firebase/custom/index.all.ts
new file mode 100644
index 00000000000..2ad81407664
--- /dev/null
+++ b/packages/firebase/custom/index.all.ts
@@ -0,0 +1,34 @@
+/**
+ * @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 { registerVersion } from '@firebase/app';
+import { version } from '../package.json';
+
+registerVersion('fire-js-all', version, 'cdn');
+export * as app from '@firebase/app';
+export * as ai from '@firebase/ai';
+export * as analytics from '@firebase/analytics';
+export * as appCheck from '@firebase/app-check';
+export * as auth from '@firebase/auth';
+export * as dataConnect from '@firebase/data-connect';
+export * as database from '@firebase/database';
+export * as firestore from '@firebase/firestore';
+export * as functions from '@firebase/functions';
+export * as installations from '@firebase/installations';
+export * as messaging from '@firebase/messaging';
+export * as performance from '@firebase/performance';
+export * as remoteConfig from '@firebase/remote-config';
diff --git a/packages/firebase/package.json b/packages/firebase/package.json
index 4f785d15c8c..aa107876e57 100644
--- a/packages/firebase/package.json
+++ b/packages/firebase/package.json
@@ -403,7 +403,7 @@
   },
   "scripts": {
     "build": "rollup -c && gulp cdn-type-module-path && yarn build:compat",
-    "build:internal": "rollup -c && gulp cdn-type-module-path-internal && yarn build:compat",
+    "build:internal": "rollup -c rollup-internal.config.js && gulp cdn-type-module-path-internal && yarn build:compat",
     "build:compat": "rollup -c compat/rollup.config.js",
     "dev": "rollup -c -w",
     "test": "echo 'No test suite for firebase wrapper'",
@@ -446,6 +446,7 @@
     "@rollup/plugin-node-resolve": "16.0.0",
     "rollup-plugin-sourcemaps": "0.6.3",
     "@rollup/plugin-terser": "0.4.4",
+    "rollup-plugin-dts": "5.3.1",
     "rollup-plugin-typescript2": "0.36.0",
     "rollup-plugin-uglify": "6.0.4",
     "gulp": "4.0.2",
diff --git a/packages/firebase/rollup-internal.config.js b/packages/firebase/rollup-internal.config.js
index 7511a41a502..cba458bae92 100644
--- a/packages/firebase/rollup-internal.config.js
+++ b/packages/firebase/rollup-internal.config.js
@@ -21,8 +21,23 @@
  */
 
 // When run in google3, original rollup.config.js will have been renamed to rollup-main.config.js.
-import baseBuilds from './rollup-main.config.js';
+import { cdnBuilds, plugins } from './rollup.config.js';
 import license from 'rollup-plugin-license';
+import typescript from 'typescript';
+import rollupTypescriptPlugin from 'rollup-plugin-typescript2';
+import dts from 'rollup-plugin-dts';
+import { parse } from 'path';
+
+const typescriptPluginCustom = rollupTypescriptPlugin({
+  typescript,
+  allowJs: true,
+  include: ['*.ts', '**/*.ts', '*.js', '**/*.js'],
+  tsconfigOverride: {
+    compilerOptions: {
+      declaration: true
+    }
+  }
+});
 
 const firebaseLicense = license({
   banner: `@license
@@ -30,10 +45,52 @@ const firebaseLicense = license({
   SPDX-License-Identifier: Apache-2.0`
 });
 
-const buildsWithLicense = baseBuilds.map(build => {
+const buildsWithLicense = cdnBuilds.map(build => {
   return Object.assign({}, build, {
     plugins: build.plugins.concat(firebaseLicense)
   });
 });
 
-export default buildsWithLicense;
+/**
+ * Custom builds that include combinations of multiple products.
+ */
+const customBuilds = [
+  { inputFile: 'custom/index.all.ts', outputFile: 'firebase.js' },
+  {
+    inputFile: 'custom/analytics-remote-config.ts',
+    outputFile: 'firebase-analytics-rc.js'
+  }
+]
+  .map(build => {
+    const { dir, name } = parse(build.inputFile);
+    console.log(`${dir}/${name}.d.ts`);
+    console.log(`dist/${name}.global.d.ts`);
+    return [
+      {
+        input: build.inputFile,
+        output: {
+          file: build.outputFile,
+          sourcemap: true,
+          format: 'es'
+        },
+        plugins: [...plugins, typescriptPluginCustom, firebaseLicense]
+      },
+      {
+        input: `${dir}/${name}.d.ts`,
+        output: {
+          file: `dist/${name}.global.d.ts`,
+          format: 'es'
+        },
+        plugins: [
+          dts({
+            respectExternal: true
+          })
+        ]
+      }
+    ];
+  })
+  .flat();
+
+console.log(customBuilds.length);
+
+export default [/*...buildsWithLicense,*/ ...customBuilds];
diff --git a/packages/firebase/rollup.config.js b/packages/firebase/rollup.config.js
index f96ff01666c..849bb394ef1 100644
--- a/packages/firebase/rollup.config.js
+++ b/packages/firebase/rollup.config.js
@@ -134,7 +134,7 @@ const componentBuilds = pkg.components
 /**
  * CDN script builds
  */
-const cdnBuilds = [
+export const cdnBuilds = [
   {
     input: 'app/index.cdn.ts',
     output: {
@@ -175,4 +175,6 @@ const cdnBuilds = [
     })
 ];
 
+export { plugins };
+
 export default [...appBuilds, ...componentBuilds, ...cdnBuilds];