diff --git a/.changeset/slimy-jobs-wave.md b/.changeset/slimy-jobs-wave.md
new file mode 100644
index 00000000000..0cdbc28693e
--- /dev/null
+++ b/.changeset/slimy-jobs-wave.md
@@ -0,0 +1,5 @@
+---
+"@firebase/app-compat": patch
+---
+
+Remove private types in app-compat
diff --git a/packages/app-compat/api-extractor.json b/packages/app-compat/api-extractor.json
new file mode 100644
index 00000000000..e5656684172
--- /dev/null
+++ b/packages/app-compat/api-extractor.json
@@ -0,0 +1,16 @@
+{
+    "extends": "../../config/api-extractor.json",
+    // Point it to your entry point d.ts file. 
+    "mainEntryPointFilePath": "<projectFolder>/dist/src/index.d.ts",
+    "dtsRollup": {
+        "enabled": true,
+        "untrimmedFilePath": "<projectFolder>/dist/<unscopedPackageName>.d.ts",
+        "publicTrimmedFilePath": "<projectFolder>/dist/<unscopedPackageName>-public.d.ts"
+    },
+    "apiReport": {
+        /**
+         * only dts rollup is needed for app-compat
+         */
+        "enabled": false
+    }
+}
\ No newline at end of file
diff --git a/packages/app-compat/package.json b/packages/app-compat/package.json
index cdfd500c5e7..818fa43c45e 100644
--- a/packages/app-compat/package.json
+++ b/packages/app-compat/package.json
@@ -14,7 +14,7 @@
   "scripts": {
     "lint": "eslint -c .eslintrc.js '**/*.ts' --ignore-path '../../.gitignore'",
     "lint:fix": "eslint --fix -c .eslintrc.js '**/*.ts'  --ignore-path '../../.gitignore'",
-    "build": "rollup -c",
+    "build": "rollup -c && yarn api-report",
     "build:deps": "lerna run --scope @firebase/app-compat --include-dependencies build",
     "dev": "rollup -c -w",
     "test": "run-p lint test:all",
@@ -22,7 +22,9 @@
     "test:ci": "node ../../scripts/run_tests_in_ci.js -s test:all",
     "test:browser": "karma start --single-run",
     "test:browser:debug": "karma start --browsers Chrome --auto-watch",
-    "test:node": "TS_NODE_FILES=true TS_NODE_CACHE=NO TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\"}' nyc --reporter lcovonly -- mocha test/**/*.test.* src/**/*.test.ts --config ../../config/mocharc.node.js"
+    "test:node": "TS_NODE_FILES=true TS_NODE_CACHE=NO TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\"}' nyc --reporter lcovonly -- mocha test/**/*.test.* src/**/*.test.ts --config ../../config/mocharc.node.js",
+    "api-report": "api-extractor run --local --verbose",
+    "typings:public": "node ../../scripts/exp/use_typings.js ./dist/app-compat-public.d.ts"
   },
   "license": "Apache-2.0",
   "dependencies": {
diff --git a/packages/app-compat/src/firebaseApp.ts b/packages/app-compat/src/firebaseApp.ts
index 8697a4a14ff..8a583bfca79 100644
--- a/packages/app-compat/src/firebaseApp.ts
+++ b/packages/app-compat/src/firebaseApp.ts
@@ -59,6 +59,9 @@ export interface _FirebaseApp {
 /**
  * Global context object for a collection of services using
  * a shared authentication state.
+ * 
+ * marked as internal because it references internal types exported from @firebase/app
+ * @internal
  */
 export class FirebaseAppImpl implements Compat<_FirebaseAppExp>, _FirebaseApp {
   private container: ComponentContainer;
diff --git a/packages/app-compat/src/public-types.ts b/packages/app-compat/src/public-types.ts
index 37387047b38..5759e6daa99 100644
--- a/packages/app-compat/src/public-types.ts
+++ b/packages/app-compat/src/public-types.ts
@@ -15,7 +15,7 @@
  * limitations under the License.
  */
 import { LogCallback, LogLevelString, LogOptions } from '@firebase/logger';
-import { FirebaseAppImpl, _FirebaseApp } from './firebaseApp';
+import { _FirebaseApp } from './firebaseApp';
 
 export interface FirebaseOptions {
   apiKey?: string;
@@ -31,6 +31,10 @@ export interface FirebaseOptions {
 export interface FirebaseAppConfig {
   name?: string;
   automaticDataCollectionEnabled?: boolean;
+}    
+
+interface FirebaseAppContructor {
+  new (): FirebaseApp;
 }
 
 /**
@@ -81,7 +85,7 @@ export interface FirebaseNamespace {
      *
      * DO NOT call this constuctor directly (use firebase.app() instead).
      */
-    App: typeof FirebaseAppImpl;
+    App: FirebaseAppContructor;
   };
 
   /**