FirebaseExtended · tyler-reitz · Jul 10, 2026 · Jul 8, 2026 · Jul 9, 2026 · Jul 9, 2026
diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
@@ -79,6 +79,27 @@ jobs:
           ./reactfire-${{ github.run_id }}/unpack.sh
       - name: Run tests
         run: npm run test
+  type-check:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        react: ["18", "19"]
+      fail-fast: false
+    name: Type check (React ${{ matrix.react }})
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Setup node
+        uses: actions/setup-node@v4
+        with:
+          node-version: '24'
+          cache: 'npm'
+      - name: Install deps
+        run: npm ci
+      - name: Install React ${{ matrix.react }} types
+        run: npm install --no-save react@${{ matrix.react }} react-dom@${{ matrix.react }} @types/react@${{ matrix.react }} @types/react-dom@${{ matrix.react }}
+      - name: Type check
+        run: npx tsc --noEmit
   publish:
     runs-on: ubuntu-latest
     name: Publish (NPM)

diff --git a/docs/reference/functions/AuthCheck.md b/docs/reference/functions/AuthCheck.md
diff --git a/docs/reference/functions/SuspenseWithPerf.md b/docs/reference/functions/SuspenseWithPerf.md
diff --git a/docs/reference/type-aliases/StorageImageProps.md b/docs/reference/type-aliases/StorageImageProps.md
diff --git a/docs/reference/variables/AnalyticsProvider.md b/docs/reference/variables/AnalyticsProvider.md
diff --git a/docs/reference/variables/AppCheckProvider.md b/docs/reference/variables/AppCheckProvider.md
diff --git a/docs/reference/variables/AuthProvider.md b/docs/reference/variables/AuthProvider.md
diff --git a/docs/reference/variables/DatabaseProvider.md b/docs/reference/variables/DatabaseProvider.md
diff --git a/docs/reference/variables/FirestoreProvider.md b/docs/reference/variables/FirestoreProvider.md
diff --git a/docs/reference/variables/FunctionsProvider.md b/docs/reference/variables/FunctionsProvider.md
diff --git a/docs/reference/variables/PerformanceProvider.md b/docs/reference/variables/PerformanceProvider.md
diff --git a/docs/reference/variables/RemoteConfigProvider.md b/docs/reference/variables/RemoteConfigProvider.md
diff --git a/docs/reference/variables/StorageProvider.md b/docs/reference/variables/StorageProvider.md
diff --git a/src/auth.tsx b/src/auth.tsx
@@ -244,7 +244,7 @@ export function ClaimsCheck({ user, fallback, children, requiredClaims }: Claims
  *
  * Meant for Concurrent mode only (`<FirebaseAppProvider suspense=true />`). [More detail](https://github.com/FirebaseExtended/reactfire/issues/325#issuecomment-827654376).
  */
-export function AuthCheck({ fallback, children, requiredClaims }: AuthCheckProps): JSX.Element {
+export function AuthCheck({ fallback, children, requiredClaims }: AuthCheckProps): React.ReactElement {
   const { data: user } = useUser<User>();
 
   const suspenseMode = useSuspenseEnabledFromConfigAndContext();

diff --git a/src/performance.tsx b/src/performance.tsx
@@ -6,7 +6,7 @@ export interface SuspensePerfProps {
   fallback: React.ReactNode;
 }
 
-export function SuspenseWithPerf({ children, traceId, fallback }: SuspensePerfProps): JSX.Element {
+export function SuspenseWithPerf({ children, traceId, fallback }: SuspensePerfProps): React.ReactElement {
   // TODO: Should this import firebase/performance?
 
   const perf = typeof globalThis !== 'undefined' ? globalThis.performance : undefined;

diff --git a/src/sdk.tsx b/src/sdk.tsx
@@ -28,7 +28,7 @@ export const RemoteConfigSdkContext = React.createContext<RemoteConfig | undefin
 type FirebaseSdks = Analytics | AppCheck | Auth | Database | Firestore | FirebasePerformance | FirebaseStorage | Functions | RemoteConfig;
 
 function getSdkProvider<Sdk extends FirebaseSdks>(SdkContext: React.Context<Sdk | undefined>) {
-  return function SdkProvider(props: React.PropsWithChildren<{ sdk: Sdk }>) {
+  return function SdkProvider(props: React.PropsWithChildren<{ sdk: Sdk }>): React.ReactElement {
     if (!props.sdk) throw new Error('no sdk provided');
 
     const contextualAppName = useFirebaseApp().name;

diff --git a/src/storage.tsx b/src/storage.tsx
@@ -37,7 +37,7 @@ export type StorageImageProps = {
   storagePath: string;
   storage?: FirebaseStorage;
   suspense?: boolean;
-  placeHolder?: JSX.Element;
+  placeHolder?: React.ReactNode;
 };
 
 function StorageFromContext(props: StorageImageProps & React.DetailedHTMLProps<React.ImgHTMLAttributes<HTMLImageElement>, HTMLImageElement>) {
@@ -48,7 +48,7 @@ function StorageFromContext(props: StorageImageProps & React.DetailedHTMLProps<R
   return <INTERNALStorageImage {...props} />;
 }
 
-function INTERNALStorageImage(props: StorageImageProps & React.DetailedHTMLProps<React.ImgHTMLAttributes<HTMLImageElement>, HTMLImageElement>): JSX.Element {
+function INTERNALStorageImage(props: StorageImageProps & React.DetailedHTMLProps<React.ImgHTMLAttributes<HTMLImageElement>, HTMLImageElement>): React.ReactNode {
   const { storage, storagePath, suspense, placeHolder, ...imgProps } = props;
 
   const reactfireOptions: ReactFireOptions<string> = {