fix(bridge): harden SSR V1 identity and lifecycle boundaries

packages/bridge/bridge-react/src/hydration.spec.tsx

@@ -82,12 +82,12 @@ describe('Bridge hydration registry', () => {
     document.body.innerHTML = original + original;
     expect(() =>
       createBridgeHydrationRegistry(document).peek('remote/app', 'remote-1'),
-    ).toThrow(/Duplicate Bridge SSR instanceId/);
+    ).toThrow(/Duplicate Bridge SSR identity/);
 
     document.body.innerHTML = original;
-    expect(() =>
+    expect(
       createBridgeHydrationRegistry(document).peek('other/app', 'remote-1'),
-    ).toThrow(/belongs to remote\/app/);
+    ).toBeUndefined();
 
     document.body.innerHTML = original.replace(
       '</script></div>',
@@ -105,4 +105,34 @@ describe('Bridge hydration registry', () => {
       createBridgeHydrationRegistry(document).peek('remote/app', 'remote-1'),
     ).toThrow(/incompatible state envelope/);
   });
+
+  it('allows the same instanceId across different module names', () => {
+    const second = {
+      ...result,
+      moduleName: 'other/app',
+      html: '<p>other remote</p>',
+    };
+    document.body.innerHTML =
+      renderToStaticMarkup(
+        <BridgeRemoteSlot
+          moduleName={result.moduleName}
+          instanceId={result.instanceId}
+          payload={result}
+        />,
+      ) +
+      renderToStaticMarkup(
+        <BridgeRemoteSlot
+          moduleName={second.moduleName}
+          instanceId={second.instanceId}
+          payload={second}
+        />,
+      );
+    const registry = createBridgeHydrationRegistry(document);
+    expect(registry.peek('remote/app', 'remote-1')?.html).toBe(
+      '<p>server remote</p>',
+    );
+    expect(registry.peek('other/app', 'remote-1')?.html).toBe(
+      '<p>other remote</p>',
+    );
+  });
 });

packages/bridge/bridge-react/src/provider/versions/bridge-base.tsx

@@ -71,6 +71,8 @@ export function createBaseBridgeComponent<T>({
             ? hydrateState(ssrState as BridgeJSONValue | undefined)
             : {};
 
+        if (info.signal?.aborted) return;
+
         const beforeBridgeRenderRes =
           instance?.bridgeHook?.lifecycle?.beforeBridgeRender?.emit(info) || {};
 
@@ -124,6 +126,12 @@ export function createBaseBridgeComponent<T>({
             rootMap.set(dom, root as any);
           }
 
+          if (info.signal?.aborted) {
+            if (root && 'unmount' in root) root.unmount();
+            rootMap.delete(dom);
+            return;
+          }
+
           if (root && 'render' in root) {
             if (!didHydrate) root.render(rootComponentWithErrorBoundary);
           }

packages/bridge/bridge-react/src/provider/versions/bridge-server.tsx

@@ -34,6 +34,7 @@ export function createServerBridgeComponent<T>(
       const config =
         typeof bridgeInfo.ssr === 'object' ? bridgeInfo.ssr : undefined;
       const preparedValue = await config?.prepare?.(context);
+      if (context.signal.aborted) throw context.signal.reason;
       const prepared = (preparedValue || {}) as BridgeSSRPrepareResult<T>;
       const renderInfo = (prepared.props ?? context.props) as T &
         ProviderParams;

packages/bridge/bridge-react/src/remote/RemoteAppWrapper.tsx

@@ -14,6 +14,7 @@ import { federationRuntime } from '../provider/plugin';
 import { RemoteComponentProps, RemoteAppParams } from '../types';
 import type { RemoteAppSSRProps } from '../types';
 import {
+  BridgeSSRError,
   getMatchingBridgeSSRPayload,
   type BridgeSSRReference,
   type BridgeSSRResult,
@@ -35,6 +36,25 @@ function scheduleBridgeDestroy(destroy: () => void) {
   else void Promise.resolve().then(destroy);
 }
 
+function destroyProviderRoot(
+  provider: { destroy?: (info: { dom: HTMLElement }) => void } | null,
+  dom: HTMLElement | null,
+  destroyInfo: Record<string, unknown>,
+) {
+  if (!provider?.destroy || !dom) return;
+  try {
+    federationRuntime.instance?.bridgeHook?.lifecycle?.beforeBridgeDestroy?.emit(
+      destroyInfo,
+    );
+    provider.destroy({ dom });
+    federationRuntime.instance?.bridgeHook?.lifecycle?.afterBridgeDestroy?.emit(
+      destroyInfo,
+    );
+  } catch (error) {
+    LoggerInstance.error('Bridge remote destroy failed', error);
+  }
+}
+
 export const RemoteAppWrapper = forwardRef<HTMLDivElement, any>(function (
   props: RemoteAppParams & RemoteComponentProps & RemoteAppSSRProps,
   ref,
@@ -66,6 +86,11 @@ export const RemoteAppWrapper = forwardRef<HTMLDivElement, any>(function (
       ? (ssrPayload as BridgeSSRReference)
       : undefined;
   const registry = useBridgeHydrationRegistry();
+  if (reference && !registry) {
+    throw new BridgeSSRError(
+      'Bridge SSR references require BridgeHydrationProvider before hydrateRoot',
+    );
+  }
   const hydrationSnapshotRef = useRef<{
     identity: string;
     snapshot: ReturnType<NonNullable<typeof registry>['peek']>;
@@ -78,12 +103,16 @@ export const RemoteAppWrapper = forwardRef<HTMLDivElement, any>(function (
   ) {
     hydrationSnapshotRef.current = {
       identity: hydrationIdentity,
-      snapshot: registry?.peek(reference!.moduleName, instanceId!),
+      snapshot: registry!.peek(reference!.moduleName, instanceId!),
     };
   }
   const snapshot = hydrationIdentity
     ? hydrationSnapshotRef.current?.snapshot
     : undefined;
+  // Keep the SSR slot shape for the lifetime of a recovered snapshot so SPA
+  // revisit CSR switches do not replace the hydrated mount node underneath an
+  // active provider root. Hosts that omit `ssr` after consume still retain the
+  // snapshot until this wrapper unmounts.
   const hasSSRPayload = Boolean((serverPayload || snapshot) && instanceId);
 
   const instance = federationRuntime.instance;
@@ -132,17 +161,7 @@ export const RemoteAppWrapper = forwardRef<HTMLDivElement, any>(function (
         ...resProps,
       };
       scheduleBridgeDestroy(() => {
-        try {
-          instance?.bridgeHook?.lifecycle?.beforeBridgeDestroy?.emit(
-            destroyInfo,
-          );
-          provider.destroy({ dom });
-          instance?.bridgeHook?.lifecycle?.afterBridgeDestroy?.emit(
-            destroyInfo,
-          );
-        } catch (error) {
-          LoggerInstance.error('Bridge remote destroy failed', error);
-        }
+        destroyProviderRoot(provider, dom, destroyInfo);
       });
     };
   }, [moduleName, providerInfo]);
@@ -171,6 +190,21 @@ export const RemoteAppWrapper = forwardRef<HTMLDivElement, any>(function (
     if (areRenderInputsEqual(lastRenderInputsRef.current, renderInputs)) return;
     lastRenderInputsRef.current = renderInputs;
 
+    const previousDom = renderDom.current;
+    if (previousDom && previousDom !== dom) {
+      // SSR slot <-> CSR mount transitions replace the ref target. Destroy the
+      // previous provider root before rendering into the new DOM node.
+      destroyProviderRoot(provider, previousDom, {
+        moduleName,
+        dom: previousDom,
+        basename,
+        memoryRoute,
+        fallback,
+        ...resProps,
+      });
+    }
+    renderDom.current = dom;
+
     const renderProps = {
       moduleName,
       dom,
@@ -182,7 +216,6 @@ export const RemoteAppWrapper = forwardRef<HTMLDivElement, any>(function (
       signal,
       ...resProps,
     };
-    renderDom.current = dom;
 
     renderQueueRef.current = renderQueueRef.current
       .then(async () => {
@@ -192,12 +225,16 @@ export const RemoteAppWrapper = forwardRef<HTMLDivElement, any>(function (
             renderProps,
           ) || {},
         )) as { extraProps?: Record<string, unknown> };
+        if (signal.aborted || !dom.isConnected) return;
         const currentRenderProps = {
           ...renderProps,
           ...beforeBridgeRenderRes.extraProps,
         };
         await provider.render(currentRenderProps);
-        if (signal.aborted || !dom.isConnected) return;
+        if (signal.aborted || !dom.isConnected) {
+          provider.destroy?.({ dom });
+          return;
+        }
         if (
           snapshot &&
           instanceId &&

packages/bridge/bridge-shared/src/renderRemoteBridge.ts

@@ -43,6 +43,13 @@ export async function renderRemoteBridge<P = Record<string, unknown>>(
     );
   }
 
+  if (options.request.signal.aborted) {
+    throw new BridgeSSRError(
+      `Bridge SSR request for ${options.moduleName} was aborted`,
+      options.request.signal.reason,
+    );
+  }
+
   const exportName = options.export ?? 'default';
   const factory = remoteModule[exportName];
   if (typeof factory !== 'function') {

packages/bridge/bridge-shared/src/ssr.spec.ts

@@ -25,6 +25,29 @@ describe('Bridge SSR V1 contract', () => {
     expect(() => assertBridgeJSONValue({ value: Number.NaN })).toThrow(
       /finite/,
     );
+    expect(() =>
+      assertBridgeJSONValue(JSON.parse('{"__proto__":{"polluted":true}}')),
+    ).toThrow(/__proto__/);
+  });
+
+  it('treats empty SSR markup as hydration-eligible when markers match', async () => {
+    const { hasBridgeSSRMarkup, getBridgeSSRContainerAttrs } =
+      await import('./ssr');
+    const attrs = getBridgeSSRContainerAttrs({
+      moduleName: 'remote/app',
+      instanceId: 'remote-1',
+    });
+    const dom = {
+      getAttribute(name: string) {
+        return attrs[name] ?? null;
+      },
+    } as HTMLElement;
+    expect(
+      hasBridgeSSRMarkup(dom, {
+        moduleName: 'remote/app',
+        instanceId: 'remote-1',
+      }),
+    ).toBe(true);
   });
 
   it('validates host-carried results before matching their identity', () => {