From 16b5032dfe705c51e949856e6f8e0cd37f05a3a4 Mon Sep 17 00:00:00 2001
From: "anthropic-code-agent[bot]" <242468646+Claude@users.noreply.github.com>
Date: Wed, 4 Mar 2026 09:18:47 +0000
Subject: [PATCH 01/12] Initial plan


From ab2596a3a527661b1d04536a676c78c7646f339c Mon Sep 17 00:00:00 2001
From: "anthropic-code-agent[bot]" <242468646+Claude@users.noreply.github.com>
Date: Wed, 4 Mar 2026 09:25:39 +0000
Subject: [PATCH 02/12] Port sendBoxMiddleware to polymiddleware infrastructure

Co-authored-by: compulim <1622400+compulim@users.noreply.github.com>
---
 .../src/PolymiddlewareComposer.tsx            | 20 ++++-
 packages/api-middleware/src/index.ts          | 14 ++++
 packages/api-middleware/src/legacy.ts         |  7 ++
 .../src/legacy/sendBoxMiddleware.ts           | 31 +++++++
 .../src/sendBoxPolymiddleware.tsx             | 84 +++++++++++++++++++
 .../src/types/Polymiddleware.ts               |  3 +-
 packages/api/src/boot/middleware.ts           | 16 ++++
 packages/api/src/index.ts                     |  6 +-
 .../api/src/legacy/LegacySendBoxBridge.tsx    | 22 +++++
 .../createSendBoxPolymiddlewareFromLegacy.tsx | 57 +++++++++++++
 .../api/src/middleware/SendBoxMiddleware.ts   | 14 ++++
 11 files changed, 271 insertions(+), 3 deletions(-)
 create mode 100644 packages/api-middleware/src/legacy/sendBoxMiddleware.ts
 create mode 100644 packages/api-middleware/src/sendBoxPolymiddleware.tsx
 create mode 100644 packages/api/src/legacy/LegacySendBoxBridge.tsx
 create mode 100644 packages/api/src/legacy/createSendBoxPolymiddlewareFromLegacy.tsx

diff --git a/packages/api-middleware/src/PolymiddlewareComposer.tsx b/packages/api-middleware/src/PolymiddlewareComposer.tsx
index 4780e3fc86..7c079ad469 100644
--- a/packages/api-middleware/src/PolymiddlewareComposer.tsx
+++ b/packages/api-middleware/src/PolymiddlewareComposer.tsx
@@ -16,6 +16,7 @@ import {
 
 import { ActivityPolymiddlewareProvider, extractActivityEnhancer } from './activityPolymiddleware';
 import { ErrorBoxPolymiddlewareProvider, extractErrorBoxEnhancer } from './errorBoxPolymiddleware';
+import { extractSendBoxEnhancer, SendBoxPolymiddlewareProvider } from './sendBoxPolymiddleware';
 import { Polymiddleware } from './types/Polymiddleware';
 
 const polymiddlewareComposerPropsSchema = pipe(
@@ -64,6 +65,21 @@ function PolymiddlewareComposer(props: PolymiddlewareComposerProps) {
 
   const errorBoxPolymiddleware = useMemo(() => errorBoxEnhancers.map(enhancer => () => enhancer), [errorBoxEnhancers]);
 
+  const sendBoxEnhancers = useMemoWithPrevious<ReturnType<typeof extractSendBoxEnhancer>>(
+    (prevSendBoxEnhancers = []) => {
+      const sendBoxEnhancers = extractSendBoxEnhancer(polymiddleware);
+
+      // Checks for array equality, return previous version if nothing has changed.
+      return prevSendBoxEnhancers.length === sendBoxEnhancers.length &&
+        sendBoxEnhancers.every((middleware, index) => Object.is(middleware, prevSendBoxEnhancers.at(index)))
+        ? prevSendBoxEnhancers
+        : sendBoxEnhancers;
+    },
+    [polymiddleware]
+  );
+
+  const sendBoxPolymiddleware = useMemo(() => sendBoxEnhancers.map(enhancer => () => enhancer), [sendBoxEnhancers]);
+
   // Didn't thoroughly think through this part yet, but I am using the first approach for now:
 
   // 1. <XXXProvider> for every type of middleware
@@ -75,7 +91,9 @@ function PolymiddlewareComposer(props: PolymiddlewareComposerProps) {
 
   return (
     <ActivityPolymiddlewareProvider middleware={activityPolymiddleware}>
-      <ErrorBoxPolymiddlewareProvider middleware={errorBoxPolymiddleware}>{children}</ErrorBoxPolymiddlewareProvider>
+      <ErrorBoxPolymiddlewareProvider middleware={errorBoxPolymiddleware}>
+        <SendBoxPolymiddlewareProvider middleware={sendBoxPolymiddleware}>{children}</SendBoxPolymiddlewareProvider>
+      </ErrorBoxPolymiddlewareProvider>
     </ActivityPolymiddlewareProvider>
   );
 }
diff --git a/packages/api-middleware/src/index.ts b/packages/api-middleware/src/index.ts
index 9e0a8aeb8e..1a306a6b63 100644
--- a/packages/api-middleware/src/index.ts
+++ b/packages/api-middleware/src/index.ts
@@ -26,6 +26,20 @@ export {
   type ErrorBoxPolymiddlewareRequest
 } from './errorBoxPolymiddleware';
 
+export {
+  createSendBoxPolymiddleware,
+  sendBoxComponent,
+  SendBoxPolymiddlewareProxy,
+  useBuildRenderSendBoxCallback,
+  type SendBoxPolymiddleware,
+  type SendBoxPolymiddlewareHandler,
+  type SendBoxPolymiddlewareHandlerResult,
+  type SendBoxPolymiddlewareProps,
+  type SendBoxPolymiddlewareProxyProps,
+  type SendBoxPolymiddlewareRenderer,
+  type SendBoxPolymiddlewareRequest
+} from './sendBoxPolymiddleware';
+
 // TODO: [P0] Add tests for nesting `polymiddleware`.
 export { default as PolymiddlewareComposer } from './PolymiddlewareComposer';
 export { type Polymiddleware } from './types/Polymiddleware';
diff --git a/packages/api-middleware/src/legacy.ts b/packages/api-middleware/src/legacy.ts
index c9405239c4..c602687b97 100644
--- a/packages/api-middleware/src/legacy.ts
+++ b/packages/api-middleware/src/legacy.ts
@@ -6,3 +6,10 @@ export {
 } from './legacy/activityMiddleware';
 
 export { type LegacyAttachmentMiddleware, type LegacyRenderAttachment } from './legacy/attachmentMiddleware';
+
+export {
+  type LegacySendBoxComponentFactory,
+  type LegacySendBoxMiddleware,
+  type LegacySendBoxProps,
+  type LegacySendBoxRenderer
+} from './legacy/sendBoxMiddleware';
diff --git a/packages/api-middleware/src/legacy/sendBoxMiddleware.ts b/packages/api-middleware/src/legacy/sendBoxMiddleware.ts
new file mode 100644
index 0000000000..fdfdcdecb2
--- /dev/null
+++ b/packages/api-middleware/src/legacy/sendBoxMiddleware.ts
@@ -0,0 +1,31 @@
+import { type ComponentEnhancer } from 'react-chain-of-responsibility';
+import { type ComponentType, type ReactNode } from 'react';
+
+/**
+ * @deprecated Legacy sendBox middleware is being deprecated and will be removed on or after 2027-08-16.
+ */
+type LegacySendBoxProps = {
+  readonly className?: string | undefined;
+};
+
+/**
+ * @deprecated Legacy sendBox middleware is being deprecated and will be removed on or after 2027-08-16.
+ */
+type LegacySendBoxRenderer = () => ReactNode;
+
+/**
+ * @deprecated Legacy sendBox middleware is being deprecated and will be removed on or after 2027-08-16.
+ */
+type LegacySendBoxComponentFactory = ComponentType<LegacySendBoxProps>;
+
+/**
+ * @deprecated Legacy sendBox middleware is being deprecated and will be removed on or after 2027-08-16.
+ */
+type LegacySendBoxMiddleware = () => ComponentEnhancer<void, LegacySendBoxProps, LegacySendBoxRenderer>;
+
+export {
+  type LegacySendBoxComponentFactory,
+  type LegacySendBoxMiddleware,
+  type LegacySendBoxProps,
+  type LegacySendBoxRenderer
+};
diff --git a/packages/api-middleware/src/sendBoxPolymiddleware.tsx b/packages/api-middleware/src/sendBoxPolymiddleware.tsx
new file mode 100644
index 0000000000..aeeba1c7c4
--- /dev/null
+++ b/packages/api-middleware/src/sendBoxPolymiddleware.tsx
@@ -0,0 +1,84 @@
+import { validateProps } from '@msinternal/botframework-webchat-react-valibot';
+import React, { memo, useMemo } from 'react';
+import { object, optional, pipe, readonly, string, type InferInput } from 'valibot';
+
+import createErrorBoundaryMiddleware from './private/createErrorBoundaryMiddleware';
+import templatePolymiddleware, {
+  type InferHandler,
+  type InferHandlerResult,
+  type InferMiddleware,
+  type InferProps,
+  type InferProviderProps,
+  type InferRenderer,
+  type InferRequest
+} from './private/templatePolymiddleware';
+
+const {
+  createMiddleware: createSendBoxPolymiddleware,
+  extractEnhancer: extractSendBoxEnhancer,
+  Provider,
+  Proxy,
+  reactComponent: sendBoxComponent,
+  useBuildRenderCallback: useBuildRenderSendBoxCallback
+} = templatePolymiddleware<void, { readonly className?: string | undefined }>('sendBox');
+
+type SendBoxPolymiddleware = InferMiddleware<typeof Provider>;
+type SendBoxPolymiddlewareHandler = InferHandler<typeof Provider>;
+type SendBoxPolymiddlewareHandlerResult = InferHandlerResult<typeof Provider>;
+type SendBoxPolymiddlewareProps = InferProps<typeof Provider>;
+type SendBoxPolymiddlewareRenderer = InferRenderer<typeof Provider>;
+type SendBoxPolymiddlewareRequest = InferRequest<typeof Provider>;
+type SendBoxPolymiddlewareProviderProps = InferProviderProps<typeof Provider>;
+
+const sendBoxPolymiddlewareProxyPropsSchema = pipe(object({}), readonly());
+
+type SendBoxPolymiddlewareProxyProps = Readonly<InferInput<typeof sendBoxPolymiddlewareProxyPropsSchema>>;
+
+// A friendlier version than the organic <Proxy>.
+const SendBoxPolymiddlewareProxy = memo(function SendBoxPolymiddlewareProxy(
+  props: SendBoxPolymiddlewareProxyProps
+) {
+  validateProps(sendBoxPolymiddlewareProxyPropsSchema, props);
+
+  const request = useMemo(() => undefined, []);
+
+  return <Proxy request={request} />;
+});
+
+const SendBoxPolymiddlewareProvider = memo(function SendBoxPolymiddlewareProvider({
+  children,
+  middleware
+}: SendBoxPolymiddlewareProviderProps) {
+  // Decorates middleware with <ErrorBoundary>.
+  const middlewareWithErrorBoundary = useMemo(
+    () =>
+      Object.freeze([
+        createErrorBoundaryMiddleware({
+          createMiddleware: createSendBoxPolymiddleware,
+          reactComponent: sendBoxComponent,
+          where: 'SendBox polymiddleware'
+        }),
+        ...middleware
+      ]),
+    [middleware]
+  );
+
+  return <Provider middleware={middlewareWithErrorBoundary}>{children}</Provider>;
+});
+
+export {
+  createSendBoxPolymiddleware,
+  extractSendBoxEnhancer,
+  sendBoxComponent,
+  SendBoxPolymiddlewareProvider,
+  SendBoxPolymiddlewareProxy,
+  useBuildRenderSendBoxCallback,
+  type SendBoxPolymiddleware,
+  type SendBoxPolymiddlewareHandler,
+  type SendBoxPolymiddlewareHandlerResult,
+  type SendBoxPolymiddlewareProps,
+  type SendBoxPolymiddlewareProviderProps,
+  type SendBoxPolymiddlewareProxyProps,
+  type SendBoxPolymiddlewareRenderer,
+  type SendBoxPolymiddlewareRequest
+};
diff --git a/packages/api-middleware/src/types/Polymiddleware.ts b/packages/api-middleware/src/types/Polymiddleware.ts
index 729d27c87d..1eeb39bdae 100644
--- a/packages/api-middleware/src/types/Polymiddleware.ts
+++ b/packages/api-middleware/src/types/Polymiddleware.ts
@@ -1,4 +1,5 @@
 import { type ActivityPolymiddleware } from '../activityPolymiddleware';
 import { type ErrorBoxPolymiddleware } from '../errorBoxPolymiddleware';
+import { type SendBoxPolymiddleware } from '../sendBoxPolymiddleware';
 
-export type Polymiddleware = ActivityPolymiddleware | ErrorBoxPolymiddleware;
+export type Polymiddleware = ActivityPolymiddleware | ErrorBoxPolymiddleware | SendBoxPolymiddleware;
diff --git a/packages/api/src/boot/middleware.ts b/packages/api/src/boot/middleware.ts
index 8d42eb1069..c83a8d7322 100644
--- a/packages/api/src/boot/middleware.ts
+++ b/packages/api/src/boot/middleware.ts
@@ -30,4 +30,20 @@ export {
   type ErrorBoxPolymiddlewareRequest
 } from '@msinternal/botframework-webchat-api-middleware';
 
+export {
+  createSendBoxPolymiddleware,
+  sendBoxComponent,
+  SendBoxPolymiddlewareProxy,
+  useBuildRenderSendBoxCallback,
+  type SendBoxPolymiddleware,
+  type SendBoxPolymiddlewareHandler,
+  type SendBoxPolymiddlewareHandlerResult,
+  type SendBoxPolymiddlewareProps,
+  type SendBoxPolymiddlewareProxyProps,
+  type SendBoxPolymiddlewareRenderer,
+  type SendBoxPolymiddlewareRequest
+} from '@msinternal/botframework-webchat-api-middleware';
+
 export { default as createActivityPolymiddlewareFromLegacy } from '../legacy/createActivityPolymiddlewareFromLegacy';
+
+export { default as createSendBoxPolymiddlewareFromLegacy } from '../legacy/createSendBoxPolymiddlewareFromLegacy';
diff --git a/packages/api/src/index.ts b/packages/api/src/index.ts
index 2b2cff9478..e6485dd7ae 100644
--- a/packages/api/src/index.ts
+++ b/packages/api/src/index.ts
@@ -5,7 +5,11 @@ export type {
   LegacyActivityMiddleware as ActivityMiddleware,
   /** @deprecated Use `polymiddleware` instead, this will be removed on or after 2027-08-16. */
   LegacyAttachmentMiddleware as AttachmentMiddleware,
-  LegacyRenderAttachment as RenderAttachment
+  LegacyRenderAttachment as RenderAttachment,
+  /** @deprecated Use `polymiddleware` instead, this will be removed on or after 2027-08-16. */
+  LegacySendBoxComponentFactory as SendBoxComponentFactory,
+  /** @deprecated Use `polymiddleware` instead, this will be removed on or after 2027-08-16. */
+  LegacySendBoxRenderer as SendBoxRenderer
 } from '@msinternal/botframework-webchat-api-middleware/legacy';
 
 export * as hooks from './boot/hook';
diff --git a/packages/api/src/legacy/LegacySendBoxBridge.tsx b/packages/api/src/legacy/LegacySendBoxBridge.tsx
new file mode 100644
index 0000000000..c3cb71ceb7
--- /dev/null
+++ b/packages/api/src/legacy/LegacySendBoxBridge.tsx
@@ -0,0 +1,22 @@
+import { validateProps } from '@msinternal/botframework-webchat-react-valibot';
+import React, { Fragment, memo, useMemo } from 'react';
+
+import { legacySendBoxBridgeComponentPropsSchema, type LegacySendBoxBridgeComponentProps } from './createSendBoxPolymiddlewareFromLegacy';
+
+/**
+ * This component is solely for `createSendBoxPolymiddlewareFromLegacy`.
+ *
+ * @param props Legacy sendBox middleware props, includes `className` and `render`.
+ * @returns A sendBox node rendered using the `props.render()` of type `LegacySendBoxRenderFunction`.
+ */
+function LegacySendBoxBridge(props: LegacySendBoxBridgeComponentProps) {
+  const { className, render } = validateProps(legacySendBoxBridgeComponentPropsSchema, props);
+
+  const children = useMemo(() => render(), [render]);
+
+  // Pass className to the rendered component if needed
+  // For now, just render the children as-is since the legacy middleware handles className internally
+  return <Fragment>{children}</Fragment>;
+}
+
+export default memo(LegacySendBoxBridge);
diff --git a/packages/api/src/legacy/createSendBoxPolymiddlewareFromLegacy.tsx b/packages/api/src/legacy/createSendBoxPolymiddlewareFromLegacy.tsx
new file mode 100644
index 0000000000..84c9bfbbf3
--- /dev/null
+++ b/packages/api/src/legacy/createSendBoxPolymiddlewareFromLegacy.tsx
@@ -0,0 +1,57 @@
+import {
+  createSendBoxPolymiddleware,
+  sendBoxComponent,
+  type SendBoxPolymiddleware
+} from '@msinternal/botframework-webchat-api-middleware';
+import { type LegacySendBoxMiddleware } from '@msinternal/botframework-webchat-api-middleware/legacy';
+import { composeEnhancer } from 'handler-chain';
+import { type ReactNode } from 'react';
+import { custom, function_, never, object, optional, pipe, readonly, safeParse, string, type InferInput } from 'valibot';
+
+import LegacySendBoxBridge from './LegacySendBoxBridge';
+
+type LegacySendBoxRenderFunction = () => ReactNode;
+
+const legacySendBoxBridgeComponentPropsSchema = pipe(
+  object({
+    children: optional(never()),
+    className: optional(string()),
+    render: custom<LegacySendBoxRenderFunction>(value => safeParse(function_(), value).success)
+  }),
+  readonly()
+);
+
+type LegacySendBoxBridgeComponentProps = Readonly<
+  InferInput<typeof legacySendBoxBridgeComponentPropsSchema> & { children?: never }
+>;
+
+/**
+ * Polyfill legacy sendBox middleware into a polymiddleware.
+ *
+ * @deprecated Legacy sendBox middleware is being deprecated and will be removed on or after 2027-08-16.
+ * @param middleware An array of legacy sendBox middleware.
+ * @returns A polymiddleware composed by legacy sendBox middleware.
+ */
+function createSendBoxPolymiddlewareFromLegacy(
+  ...middleware: readonly LegacySendBoxMiddleware[]
+): SendBoxPolymiddleware {
+  const legacyEnhancer = composeEnhancer(...middleware.map(middleware => middleware()));
+
+  return createSendBoxPolymiddleware(next => {
+    const legacyHandler = legacyEnhancer(request => {
+      const handler = next(request);
+
+      return !!handler && (() => handler.render({}));
+    });
+
+    return request => {
+      const legacyResult = legacyHandler(request);
+
+      return legacyResult ? sendBoxComponent(LegacySendBoxBridge, { render: legacyResult }) : undefined;
+    };
+  });
+}
+
+export default createSendBoxPolymiddlewareFromLegacy;
+
+export { legacySendBoxBridgeComponentPropsSchema, type LegacySendBoxBridgeComponentProps };
diff --git a/packages/api/src/middleware/SendBoxMiddleware.ts b/packages/api/src/middleware/SendBoxMiddleware.ts
index 84deed5a48..ceb41d5a83 100644
--- a/packages/api/src/middleware/SendBoxMiddleware.ts
+++ b/packages/api/src/middleware/SendBoxMiddleware.ts
@@ -4,6 +4,9 @@ import templateMiddleware, {
   type InferRequest
 } from './private/templateMiddleware';
 
+/**
+ * @deprecated Legacy sendBox middleware is being deprecated and will be removed on or after 2027-08-16. Use `createSendBoxPolymiddleware` instead.
+ */
 const template = templateMiddleware<void, { className?: string | undefined }>('sendBoxMiddleware');
 
 const {
@@ -13,8 +16,19 @@ const {
   Proxy: SendBoxMiddlewareProxy
 } = template;
 
+/**
+ * @deprecated Legacy sendBox middleware is being deprecated and will be removed on or after 2027-08-16. Use `SendBoxPolymiddleware` instead.
+ */
 type SendBoxMiddleware = InferMiddleware<typeof template>;
+
+/**
+ * @deprecated Legacy sendBox middleware is being deprecated and will be removed on or after 2027-08-16. Use `SendBoxPolymiddlewareProps` instead.
+ */
 type SendBoxMiddlewareProps = InferProps<typeof template>;
+
+/**
+ * @deprecated Legacy sendBox middleware is being deprecated and will be removed on or after 2027-08-16. Use `SendBoxPolymiddlewareRequest` instead.
+ */
 type SendBoxMiddlewareRequest = InferRequest<typeof template>;
 
 export {

From 4794f650af97b5f22343bc5971f61892fc5e6253 Mon Sep 17 00:00:00 2001
From: "anthropic-code-agent[bot]" <242468646+Claude@users.noreply.github.com>
Date: Wed, 4 Mar 2026 09:33:38 +0000
Subject: [PATCH 03/12] Fix type imports and add test files for sendBox
 polymiddleware

Co-authored-by: compulim <1622400+compulim@users.noreply.github.com>
---
 .../legacyToPolymiddleware.html               | 57 +++++++++++++++
 .../sendBox/polymiddleware/simple.html        | 60 ++++++++++++++++
 package-lock.json                             | 72 +++++++------------
 .../src/legacy/sendBoxMiddleware.ts           | 15 +++-
 .../src/sendBoxPolymiddleware.tsx             |  2 +-
 .../api/src/legacy/LegacySendBoxBridge.tsx    | 16 ++---
 .../createSendBoxPolymiddlewareFromLegacy.tsx | 14 ++--
 packages/test/test-assets/package.json        |  2 +-
 8 files changed, 171 insertions(+), 67 deletions(-)
 create mode 100644 __tests__/html2/middleware/sendBox/legacySendBoxMiddleware/legacyToPolymiddleware.html
 create mode 100644 __tests__/html2/middleware/sendBox/polymiddleware/simple.html

diff --git a/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/legacyToPolymiddleware.html b/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/legacyToPolymiddleware.html
new file mode 100644
index 0000000000..73067c47e6
--- /dev/null
+++ b/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/legacyToPolymiddleware.html
@@ -0,0 +1,57 @@
+<!doctype html>
+<html lang="en-US">
+   <head>
+      <link href="/assets/index.css" rel="stylesheet" type="text/css" />
+      <script type="importmap">
+         {
+            "imports": {
+               "react": "https://esm.sh/react@18.3.1"
+            }
+         }
+      </script>
+      <script crossorigin="anonymous" src="/test-harness.js"></script>
+      <script crossorigin="anonymous" src="/test-page-object.js"></script>
+      <script crossorigin="anonymous" src="/__dist__/webchat-es5.js"></script>
+   </head>
+
+   <body>
+      <main id="webchat"></main>
+      <script type="module">
+         import { createElement } from 'react';
+
+         run(async function () {
+            const {
+               testHelpers: { createDirectLineEmulator },
+               WebChat: {
+                  middleware: { createSendBoxPolymiddleware, createSendBoxPolymiddlewareFromLegacy, sendBoxComponent }
+               }
+            } = window;
+
+            const { directLine, store } = createDirectLineEmulator();
+
+            const Downstream = () => createElement('div', {}, '<Downstream />');
+
+            const polymiddleware = [
+               createSendBoxPolymiddlewareFromLegacy(() => next => request => {
+                  const child = next(request);
+                  return () => createElement('div', { style: { border: 'solid 2px blue' } }, child?.());
+               }),
+               createSendBoxPolymiddleware(next => request => sendBoxComponent(Downstream))
+            ];
+
+            WebChat.renderWebChat(
+               {
+                  directLine,
+                  polymiddleware,
+                  store
+               },
+               document.getElementById('webchat')
+            );
+
+            await pageConditions.uiConnected();
+
+            await host.snapshot('local');
+         });
+      </script>
+   </body>
+</html>
diff --git a/__tests__/html2/middleware/sendBox/polymiddleware/simple.html b/__tests__/html2/middleware/sendBox/polymiddleware/simple.html
new file mode 100644
index 0000000000..e37a485c5a
--- /dev/null
+++ b/__tests__/html2/middleware/sendBox/polymiddleware/simple.html
@@ -0,0 +1,60 @@
+<!doctype html>
+<html lang="en-US">
+   <head>
+      <link href="/assets/index.css" rel="stylesheet" type="text/css" />
+      <script type="importmap">
+         {
+            "imports": {
+               "react": "https://esm.sh/react@18.3.1"
+            }
+         }
+      </script>
+      <script crossorigin="anonymous" src="/test-harness.js"></script>
+      <script crossorigin="anonymous" src="/test-page-object.js"></script>
+      <script crossorigin="anonymous" src="/__dist__/webchat-es5.js"></script>
+   </head>
+
+   <body>
+      <main id="webchat"></main>
+      <script type="module">
+         import { createElement, memo } from 'react';
+
+         run(async function () {
+            const {
+               testHelpers: { createDirectLineEmulator },
+               WebChat: {
+                  middleware: { createSendBoxPolymiddleware, sendBoxComponent }
+               }
+            } = window;
+
+            const { directLine, store } = createDirectLineEmulator();
+
+            const MySendBox = memo(function MySendBox({ className, render }) {
+               return createElement('div', { className, style: { border: 'solid 2px red' } }, render({}));
+            });
+
+            const polymiddleware = [
+               createSendBoxPolymiddleware(next => request => next(request)),
+               createSendBoxPolymiddleware(next => request => {
+                  const result = next(request);
+
+                  return sendBoxComponent(MySendBox, { render: result.render });
+               })
+            ];
+
+            WebChat.renderWebChat(
+               {
+                  directLine,
+                  polymiddleware,
+                  store
+               },
+               document.getElementById('webchat')
+            );
+
+            await pageConditions.uiConnected();
+
+            await host.snapshot('local');
+         });
+      </script>
+   </body>
+</html>
diff --git a/package-lock.json b/package-lock.json
index d47ce3fe61..dbad523745 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -336,7 +336,6 @@
       "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.28.5.tgz",
       "integrity": "sha512-e7jT4DxYvIDLk1ZHmU/m/mB19rex9sv0c2ftBtjSBv+kVM/902eh0fINUzD7UwLLNR+jU585GxUJ8/EBfAM5fw==",
       "devOptional": true,
-      "peer": true,
       "dependencies": {
         "@babel/code-frame": "^7.27.1",
         "@babel/generator": "^7.28.5",
@@ -3304,7 +3303,6 @@
       "version": "29.7.0",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@jest/fake-timers": "^29.7.0",
         "@jest/types": "^29.6.3",
@@ -3342,7 +3340,6 @@
       "version": "29.7.0",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@jest/types": "^29.6.3",
         "@sinonjs/fake-timers": "^10.0.2",
@@ -3632,7 +3629,6 @@
       "version": "29.6.3",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@jest/schemas": "^29.6.3",
         "@types/istanbul-lib-coverage": "^2.0.0",
@@ -5231,7 +5227,6 @@
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       "resolved": "https://registry.npmjs.org/@types/react/-/react-16.14.68.tgz",
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-      "peer": true,
       "dependencies": {
         "@types/prop-types": "*",
         "@types/scheduler": "^0.16",
@@ -5242,7 +5237,6 @@
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       "resolved": "https://registry.npmjs.org/@types/react-dom/-/react-dom-16.9.25.tgz",
       "integrity": "sha512-ZK//eAPhwft9Ul2/Zj+6O11YR6L4JX0J2sVeBC9Ft7x7HFN7xk7yUV/zDxqV6rjvqgl6r8Dq7oQImxtyf/Mzcw==",
-      "peer": true,
       "peerDependencies": {
         "@types/react": "^16.0.0"
       }
@@ -5384,7 +5378,6 @@
       "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-8.50.0.tgz",
       "integrity": "sha512-6/cmF2piao+f6wSxUsJLZjck7OQsYyRtcOZS02k7XINSNlz93v6emM8WutDQSXnroG2xwYlEVHJI+cPA7CPM3Q==",
       "dev": true,
-      "peer": true,
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         "@typescript-eslint/types": "8.50.0",
@@ -5815,7 +5808,6 @@
       "version": "8.15.0",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "bin": {
         "acorn": "bin/acorn"
       },
@@ -6210,7 +6202,6 @@
     "node_modules/asn1.js": {
       "version": "5.4.1",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "bn.js": "^4.0.0",
         "inherits": "^2.0.1",
@@ -6285,7 +6276,8 @@
     "node_modules/asynckit": {
       "version": "0.4.0",
       "dev": true,
-      "license": "MIT"
+      "license": "MIT",
+      "peer": true
     },
     "node_modules/available-typed-arrays": {
       "version": "1.0.7",
@@ -6314,6 +6306,7 @@
       "resolved": "https://registry.npmjs.org/axios/-/axios-1.13.2.tgz",
       "integrity": "sha512-VPk9ebNqPcy5lRGuSlKx752IlDatOjT9paPlm8A7yOuW2Fbvp4X3JznJtT4f0GzGLLiWE9W8onz51SqLYwzGaA==",
       "dev": true,
+      "peer": true,
       "dependencies": {
         "follow-redirects": "^1.15.6",
         "form-data": "^4.0.4",
@@ -6908,7 +6901,6 @@
           "url": "https://github.com/sponsors/ai"
         }
       ],
-      "peer": true,
       "dependencies": {
         "baseline-browser-mapping": "^2.9.0",
         "caniuse-lite": "^1.0.30001759",
@@ -6957,6 +6949,7 @@
       "version": "0.2.13",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": "*"
       }
@@ -7282,6 +7275,7 @@
           "url": "https://github.com/rxaviers/cldr-data-npm/blob/master/LICENSE"
         }
       ],
+      "peer": true,
       "dependencies": {
         "cldr-data-downloader": "1.1.0",
         "glob": "10.3.12"
@@ -7290,6 +7284,7 @@
     "node_modules/cldr-data-downloader": {
       "version": "1.1.0",
       "dev": true,
+      "peer": true,
       "dependencies": {
         "axios": "^1.7.2",
         "mkdirp": "^1.0.4",
@@ -7304,12 +7299,14 @@
     "node_modules/cldr-data-downloader/node_modules/abbrev": {
       "version": "1.1.1",
       "dev": true,
-      "license": "ISC"
+      "license": "ISC",
+      "peer": true
     },
     "node_modules/cldr-data-downloader/node_modules/nopt": {
       "version": "3.0.6",
       "dev": true,
       "license": "ISC",
+      "peer": true,
       "dependencies": {
         "abbrev": "1"
       },
@@ -7321,6 +7318,7 @@
       "version": "1.0.1",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=0.6.0",
         "teleport": ">=0.2.0"
@@ -7330,6 +7328,7 @@
       "version": "10.3.12",
       "dev": true,
       "license": "ISC",
+      "peer": true,
       "dependencies": {
         "foreground-child": "^3.1.0",
         "jackspeak": "^2.3.6",
@@ -7351,6 +7350,7 @@
       "version": "2.3.6",
       "dev": true,
       "license": "BlueOak-1.0.0",
+      "peer": true,
       "dependencies": {
         "@isaacs/cliui": "^8.0.2"
       },
@@ -7369,6 +7369,7 @@
       "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-9.0.5.tgz",
       "integrity": "sha512-G6T0ZX48xgozx7587koeX9Ys2NYy6Gmv//P89sEte9V9whIapMNF4idKxnW2QtCcLiTWlb/wfCabAtAFWhhBow==",
       "dev": true,
+      "peer": true,
       "dependencies": {
         "brace-expansion": "^2.0.1"
       },
@@ -7570,6 +7571,7 @@
       "version": "1.0.8",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "delayed-stream": "~1.0.0"
       },
@@ -7823,7 +7825,6 @@
       "resolved": "https://registry.npmjs.org/core-js-pure/-/core-js-pure-3.47.0.tgz",
       "integrity": "sha512-BcxeDbzUrRnXGYIVAGFtcGQVNpFcUhVjr6W7F8XktvQW2iJP9e66GP6xdKotCRFlrxBvNIBrhwKteRXqMV86Nw==",
       "hasInstallScript": true,
-      "peer": true,
       "funding": {
         "type": "opencollective",
         "url": "https://opencollective.com/core-js"
@@ -8189,6 +8190,7 @@
       "version": "1.0.0",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=0.4.0"
       }
@@ -8737,7 +8739,6 @@
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       "dev": true,
       "hasInstallScript": true,
-      "peer": true,
       "bin": {
         "esbuild": "bin/esbuild"
       },
@@ -8803,7 +8804,6 @@
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       "deprecated": "This version is no longer supported. Please see https://eslint.org/version-support for other options.",
       "dev": true,
-      "peer": true,
       "dependencies": {
         "@eslint-community/eslint-utils": "^4.2.0",
         "@eslint-community/regexpp": "^4.6.1",
@@ -8859,7 +8859,6 @@
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       "dev": true,
-      "peer": true,
       "bin": {
         "eslint-config-prettier": "bin/cli.js"
       },
@@ -9789,6 +9788,7 @@
       "version": "1.1.0",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "pend": "~1.2.0"
       }
@@ -9965,6 +9965,7 @@
       "version": "4.0.4",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "asynckit": "^0.4.0",
         "combined-stream": "^1.0.8",
@@ -10254,7 +10255,6 @@
       "version": "1.7.1",
       "resolved": "https://registry.npmjs.org/globalize/-/globalize-1.7.1.tgz",
       "integrity": "sha512-PFymRL0PtitFOlSniuwwwNfkooi3cLQJo9Uke1+j1DsGfUkkHkwneImqVtGcqKI0TuzhAlHt7hAcgK324902HA==",
-      "peer": true,
       "dependencies": {
         "cldrjs": "^0.5.4"
       }
@@ -10496,7 +10496,6 @@
       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/handler-chain/-/handler-chain-0.1.1.tgz",
       "integrity": "sha512-5eo8F9UTUiFCMtDUF1ipva1tvOCGE+vFr33aFHSISjTqXfGywCRV2aE6TzPkMhaw1pArOv3wv2Wz3Rh+AJJ8bA==",
-      "peer": true,
       "dependencies": {
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       }
@@ -10911,8 +10910,7 @@
       "version": "2019.1.0",
       "resolved": "https://registry.npmjs.org/iana-tz-data/-/iana-tz-data-2019.1.0.tgz",
       "integrity": "sha512-T7+26Skkyxqjp4mg20/O065j9J5qP39nWVQj/2ArxQ0gSPkL+T9lwerRmiOAzFRNsNXepX45QqchqTVENwNvig==",
-      "dev": true,
-      "peer": true
+      "dev": true
     },
     "node_modules/iconv-lite": {
       "version": "0.6.3",
@@ -11769,7 +11767,6 @@
       "version": "0.3.0",
       "resolved": "https://registry.npmjs.org/iter-fest/-/iter-fest-0.3.0.tgz",
       "integrity": "sha512-t76cnHCl9MEZRaUb0VBwTXP8dWjxbcTYm91VGWfQYjSMXKkjdOAIjUsaMYuLIy9jxk9fT55XIlb4Y/HACK/zlw==",
-      "peer": true,
       "dependencies": {
         "iter-fest": "^0.3.0"
       },
@@ -12744,7 +12741,6 @@
       "version": "29.7.0",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@jest/types": "^29.6.3",
         "@types/node": "*",
@@ -13126,7 +13122,6 @@
       "version": "29.7.0",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@jest/types": "^29.6.3",
         "@types/node": "*",
@@ -14925,7 +14920,6 @@
       "version": "1.17.0",
       "resolved": "https://registry.npmjs.org/microsoft-cognitiveservices-speech-sdk/-/microsoft-cognitiveservices-speech-sdk-1.17.0.tgz",
       "integrity": "sha512-RVUCpTeu1g+R4HB/PaLQmEfsdHzwEa6+2phgCiPA4lGIiR7ILEL7qZHHUWAG6W4zcjnWeiLnL7tVgMbyd5XGgA==",
-      "peer": true,
       "dependencies": {
         "agent-base": "^6.0.1",
         "asn1.js-rfc2560": "^5.0.1",
@@ -15128,6 +15122,7 @@
       "version": "1.0.4",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "bin": {
         "mkdirp": "bin/cmd.js"
       },
@@ -15306,7 +15301,6 @@
       "version": "8.0.2",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "growly": "^1.3.0",
         "is-wsl": "^2.2.0",
@@ -15841,7 +15835,8 @@
     "node_modules/pend": {
       "version": "1.2.0",
       "dev": true,
-      "license": "MIT"
+      "license": "MIT",
+      "peer": true
     },
     "node_modules/picocolors": {
       "version": "1.1.1",
@@ -15976,7 +15971,6 @@
         }
       ],
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "nanoid": "^3.3.7",
         "picocolors": "^1.1.0",
@@ -16098,7 +16092,6 @@
       "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.7.4.tgz",
       "integrity": "sha512-v6UNi1+3hSlVvv8fSaoUbggEM5VErKmmpGA7Pl3HF8V6uKY7rvClBOJlH6yNwQtfTueNkGVpOv/mtWL9L4bgRA==",
       "dev": true,
-      "peer": true,
       "bin": {
         "prettier": "bin/prettier.cjs"
       },
@@ -16207,7 +16200,8 @@
     "node_modules/proxy-from-env": {
       "version": "1.1.0",
       "dev": true,
-      "license": "MIT"
+      "license": "MIT",
+      "peer": true
     },
     "node_modules/prr": {
       "version": "1.0.1",
@@ -16373,7 +16367,6 @@
       "version": "16.8.6",
       "resolved": "https://registry.npmjs.org/react/-/react-16.8.6.tgz",
       "integrity": "sha512-pC0uMkhLaHm11ZSJULfOBqV4tIZkx87ZLvbbQYunNixAAvjnC+snJCg0XQXn9VIsttVsbZP/H/ewzgsd5fxKXw==",
-      "peer": true,
       "dependencies": {
         "loose-envify": "^1.1.0",
         "object-assign": "^4.1.1",
@@ -16388,7 +16381,6 @@
       "version": "0.4.2",
       "resolved": "https://registry.npmjs.org/react-chain-of-responsibility/-/react-chain-of-responsibility-0.4.2.tgz",
       "integrity": "sha512-khBaWO1rSLSUw6Ydr3lYFgONwmrx9rSOClrLCyn7cq40QxVJSh5utq1rbey+Pr24trWmQdC9qweTuKG2RptTXw==",
-      "peer": true,
       "dependencies": {
         "handler-chain": "^0.1.0",
         "react-chain-of-responsibility": "^0.4.2",
@@ -16416,7 +16408,6 @@
       "version": "16.8.6",
       "resolved": "https://registry.npmjs.org/react-dom/-/react-dom-16.8.6.tgz",
       "integrity": "sha512-1nL7PIq9LTL3fthPqwkvr2zY7phIPjYrT0jp4HjyEQrEROnw4dG41VVwi/wfoCneoleqrNX7iAD+pXebJZwrwA==",
-      "peer": true,
       "dependencies": {
         "loose-envify": "^1.1.0",
         "object-assign": "^4.1.1",
@@ -16801,8 +16792,7 @@
     "node_modules/redux": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/redux/-/redux-5.0.1.tgz",
-      "integrity": "sha512-M9/ELqF6fy8FwmkpnF0S3YKOqMyoWJ4+CS5Efg2ct3oY9daQvd/Pc71FpGZsVsbl3Cpb+IIcjBDUnnyBdQbq4w==",
-      "peer": true
+      "integrity": "sha512-M9/ELqF6fy8FwmkpnF0S3YKOqMyoWJ4+CS5Efg2ct3oY9daQvd/Pc71FpGZsVsbl3Cpb+IIcjBDUnnyBdQbq4w=="
     },
     "node_modules/redux-saga": {
       "version": "1.4.2",
@@ -17136,7 +17126,6 @@
       "version": "4.46.2",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@types/estree": "1.0.8"
       },
@@ -17440,7 +17429,6 @@
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-8.17.1.tgz",
       "integrity": "sha512-B/gBuNg5SiMTrPkC+A2+cW0RszwxYmn6VYxB/inlBStS5nx6xHIt/ehKRhIMhqusl7a8LjQoZnjCs5vhwxOQ1g==",
       "dev": true,
-      "peer": true,
       "dependencies": {
         "fast-deep-equal": "^3.1.3",
         "fast-uri": "^3.0.1",
@@ -18908,7 +18896,6 @@
       "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.3.tgz",
       "integrity": "sha512-5gTmgEY/sqK6gFXLIsQNH19lWb4ebPDLA4SdLP7dsWkIXHWlG66oPuVvXSGFPppYZz8ZDZq0dYYrbHfBCVUb1Q==",
       "dev": true,
-      "peer": true,
       "engines": {
         "node": ">=12"
       },
@@ -19326,7 +19313,6 @@
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
       "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
       "devOptional": true,
-      "peer": true,
       "bin": {
         "tsc": "bin/tsc",
         "tsserver": "bin/tsserver"
@@ -19748,7 +19734,6 @@
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/use-ref-from/-/use-ref-from-0.1.0.tgz",
       "integrity": "sha512-PRjmfhUGUKghhOjKV1dBU66M7CASdb4NkMsaaWLdJA81yOZFlVL7Pi3O9aD+68pRh0VrRQjZfS6Ux3vPy1VhRg==",
-      "peer": true,
       "dependencies": {
         "@babel/runtime-corejs3": "^7.24.1",
         "use-ref-from": "^0.1.0"
@@ -19783,7 +19768,6 @@
       "version": "8.3.2",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-8.3.2.tgz",
       "integrity": "sha512-+NYs2QeMWy+GWFOEm9xnn6HCDp0l7QBD7ml8zLUmJ+93Q5NF0NocErnwkTkXVFNiX3/fpC6afS8Dhb/gz7R7eg==",
-      "peer": true,
       "bin": {
         "uuid": "dist/bin/uuid"
       }
@@ -19805,7 +19789,6 @@
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/valibot/-/valibot-1.2.0.tgz",
       "integrity": "sha512-mm1rxUsmOxzrwnX5arGS+U4T25RdvpPjPN4yR0u9pUBov9+zGVtO84tif1eY4r6zWxVxu3KzIyknJy3rxfRZZg==",
-      "peer": true,
       "peerDependencies": {
         "typescript": ">=5"
       },
@@ -19911,7 +19894,6 @@
       "resolved": "https://registry.npmjs.org/webpack/-/webpack-5.104.1.tgz",
       "integrity": "sha512-Qphch25abbMNtekmEGJmeRUhLDbe+QfiWTiqpKYkpCOWY64v9eyl+KRRLmqOFA2AvKPpc9DC6+u2n76tQLBoaA==",
       "dev": true,
-      "peer": true,
       "dependencies": {
         "@types/eslint-scope": "^3.7.7",
         "@types/estree": "^1.0.8",
@@ -19960,7 +19942,6 @@
       "resolved": "https://registry.npmjs.org/webpack-cli/-/webpack-cli-6.0.1.tgz",
       "integrity": "sha512-MfwFQ6SfwinsUVi0rNJm7rHZ31GyTcpVE5pgVA3hwFRb7COD4TzjUUwhGWKfO50+xdc2MQPuEBBJoqIMGt3JDw==",
       "dev": true,
-      "peer": true,
       "dependencies": {
         "@discoveryjs/json-ext": "^0.6.1",
         "@webpack-cli/configtest": "^3.0.1",
@@ -20492,6 +20473,7 @@
       "version": "2.10.0",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "buffer-crc32": "~0.2.3",
         "fd-slicer": "~1.1.0"
@@ -20513,7 +20495,6 @@
       "resolved": "https://registry.npmjs.org/zod/-/zod-4.2.1.tgz",
       "integrity": "sha512-0wZ1IRqGGhMP76gLqz8EyfBXKk0J2qo2+H3fi4mcUP/KtTocoX08nmIAHl1Z2kJIZbZee8KOpBCSNPRgauucjw==",
       "dev": true,
-      "peer": true,
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"
       }
@@ -21824,7 +21805,6 @@
         "react": "^18.3.1",
         "react-dom": "^18.3.1"
       },
-      "devDependencies": {},
       "engines": {
         "node": ">= 14.0.0"
       }
@@ -21922,7 +21902,6 @@
       "resolved": "https://registry.npmjs.org/react/-/react-18.3.1.tgz",
       "integrity": "sha512-wS+hAgJShR0KhEvPJArfuPVN1+Hz1t0Y6n5jLrGQbkb4urgPE/0Rve+1kMB1v/oWgHgm4WIcV+i7F2pTVj+2iQ==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "loose-envify": "^1.1.0"
       },
@@ -21935,7 +21914,6 @@
       "resolved": "https://registry.npmjs.org/react-dom/-/react-dom-18.3.1.tgz",
       "integrity": "sha512-5m4nQKp+rZRb09LNH59GM4BxTh9251/ylbKIbpe7TpGxfJ+9kv6BLkLBXIjjspbgbnIBNqlI23tRnTWT0snUIw==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "loose-envify": "^1.1.0",
         "scheduler": "^0.23.2"
diff --git a/packages/api-middleware/src/legacy/sendBoxMiddleware.ts b/packages/api-middleware/src/legacy/sendBoxMiddleware.ts
index fdfdcdecb2..e60d7b156f 100644
--- a/packages/api-middleware/src/legacy/sendBoxMiddleware.ts
+++ b/packages/api-middleware/src/legacy/sendBoxMiddleware.ts
@@ -1,4 +1,3 @@
-import { type ComponentEnhancer } from 'react-chain-of-responsibility';
 import { type ComponentType, type ReactNode } from 'react';
 
 /**
@@ -11,7 +10,12 @@ type LegacySendBoxProps = {
 /**
  * @deprecated Legacy sendBox middleware is being deprecated and will be removed on or after 2027-08-16.
  */
-type LegacySendBoxRenderer = () => ReactNode;
+type LegacySendBoxComponent = (props: LegacySendBoxProps) => Exclude<ReactNode, boolean | null | undefined>;
+
+/**
+ * @deprecated Legacy sendBox middleware is being deprecated and will be removed on or after 2027-08-16.
+ */
+type LegacySendBoxRenderer = () => LegacySendBoxComponent;
 
 /**
  * @deprecated Legacy sendBox middleware is being deprecated and will be removed on or after 2027-08-16.
@@ -21,7 +25,12 @@ type LegacySendBoxComponentFactory = ComponentType<LegacySendBoxProps>;
 /**
  * @deprecated Legacy sendBox middleware is being deprecated and will be removed on or after 2027-08-16.
  */
-type LegacySendBoxMiddleware = () => ComponentEnhancer<void, LegacySendBoxProps, LegacySendBoxRenderer>;
+type LegacySendBoxEnhancer = (next: LegacySendBoxRenderer) => LegacySendBoxRenderer;
+
+/**
+ * @deprecated Legacy sendBox middleware is being deprecated and will be removed on or after 2027-08-16.
+ */
+type LegacySendBoxMiddleware = () => LegacySendBoxEnhancer;
 
 export {
   type LegacySendBoxComponentFactory,
diff --git a/packages/api-middleware/src/sendBoxPolymiddleware.tsx b/packages/api-middleware/src/sendBoxPolymiddleware.tsx
index aeeba1c7c4..aeb8b6d7c4 100644
--- a/packages/api-middleware/src/sendBoxPolymiddleware.tsx
+++ b/packages/api-middleware/src/sendBoxPolymiddleware.tsx
@@ -1,6 +1,6 @@
 import { validateProps } from '@msinternal/botframework-webchat-react-valibot';
 import React, { memo, useMemo } from 'react';
-import { object, optional, pipe, readonly, string, type InferInput } from 'valibot';
+import { object, pipe, readonly, type InferInput } from 'valibot';
 
 import createErrorBoundaryMiddleware from './private/createErrorBoundaryMiddleware';
 import templatePolymiddleware, {
diff --git a/packages/api/src/legacy/LegacySendBoxBridge.tsx b/packages/api/src/legacy/LegacySendBoxBridge.tsx
index c3cb71ceb7..74e6e6330f 100644
--- a/packages/api/src/legacy/LegacySendBoxBridge.tsx
+++ b/packages/api/src/legacy/LegacySendBoxBridge.tsx
@@ -1,5 +1,5 @@
 import { validateProps } from '@msinternal/botframework-webchat-react-valibot';
-import React, { Fragment, memo, useMemo } from 'react';
+import React, { Fragment, memo } from 'react';
 
 import { legacySendBoxBridgeComponentPropsSchema, type LegacySendBoxBridgeComponentProps } from './createSendBoxPolymiddlewareFromLegacy';
 
@@ -7,16 +7,16 @@ import { legacySendBoxBridgeComponentPropsSchema, type LegacySendBoxBridgeCompon
  * This component is solely for `createSendBoxPolymiddlewareFromLegacy`.
  *
  * @param props Legacy sendBox middleware props, includes `className` and `render`.
- * @returns A sendBox node rendered using the `props.render()` of type `LegacySendBoxRenderFunction`.
+ * @returns A sendBox node rendered using the `props.render` component.
  */
 function LegacySendBoxBridge(props: LegacySendBoxBridgeComponentProps) {
-  const { className, render } = validateProps(legacySendBoxBridgeComponentPropsSchema, props);
+  const { className, render: RenderComponent } = validateProps(legacySendBoxBridgeComponentPropsSchema, props);
 
-  const children = useMemo(() => render(), [render]);
-
-  // Pass className to the rendered component if needed
-  // For now, just render the children as-is since the legacy middleware handles className internally
-  return <Fragment>{children}</Fragment>;
+  return (
+    <Fragment>
+      <RenderComponent className={className} />
+    </Fragment>
+  );
 }
 
 export default memo(LegacySendBoxBridge);
diff --git a/packages/api/src/legacy/createSendBoxPolymiddlewareFromLegacy.tsx b/packages/api/src/legacy/createSendBoxPolymiddlewareFromLegacy.tsx
index 84c9bfbbf3..34ebd122a7 100644
--- a/packages/api/src/legacy/createSendBoxPolymiddlewareFromLegacy.tsx
+++ b/packages/api/src/legacy/createSendBoxPolymiddlewareFromLegacy.tsx
@@ -5,12 +5,12 @@ import {
 } from '@msinternal/botframework-webchat-api-middleware';
 import { type LegacySendBoxMiddleware } from '@msinternal/botframework-webchat-api-middleware/legacy';
 import { composeEnhancer } from 'handler-chain';
-import { type ReactNode } from 'react';
+import { type ComponentType } from 'react';
 import { custom, function_, never, object, optional, pipe, readonly, safeParse, string, type InferInput } from 'valibot';
 
 import LegacySendBoxBridge from './LegacySendBoxBridge';
 
-type LegacySendBoxRenderFunction = () => ReactNode;
+type LegacySendBoxRenderFunction = ComponentType<{ readonly className?: string | undefined }>;
 
 const legacySendBoxBridgeComponentPropsSchema = pipe(
   object({
@@ -38,16 +38,16 @@ function createSendBoxPolymiddlewareFromLegacy(
   const legacyEnhancer = composeEnhancer(...middleware.map(middleware => middleware()));
 
   return createSendBoxPolymiddleware(next => {
-    const legacyHandler = legacyEnhancer(request => {
-      const handler = next(request);
+    const legacyHandler = legacyEnhancer(() => {
+      const handler = next();
 
       return !!handler && (() => handler.render({}));
     });
 
-    return request => {
-      const legacyResult = legacyHandler(request);
+    return () => {
+      const legacyResult = legacyHandler();
 
-      return legacyResult ? sendBoxComponent(LegacySendBoxBridge, { render: legacyResult }) : undefined;
+      return legacyResult ? sendBoxComponent(LegacySendBoxBridge, { render: legacyResult() }) : undefined;
     };
   });
 }
diff --git a/packages/test/test-assets/package.json b/packages/test/test-assets/package.json
index 809aaa395c..231f0777fb 100644
--- a/packages/test/test-assets/package.json
+++ b/packages/test/test-assets/package.json
@@ -19,7 +19,7 @@
     "eslint": "npm run precommit",
     "postversion": "../../../scripts/npm/postversion.sh",
     "preversion": "../../../scripts/npm/preversion.sh",
-    "start": "../../../scripts/npm/notify-build.sh \"out\""
+    "start": "../../../scripts/npm/notify-build.sh \"src\""
   },
   "pinDependencies": {},
   "localDependencies": {},

From 26d4f9e8f4f0460af20c6deac7e83eed89431c0b Mon Sep 17 00:00:00 2001
From: "anthropic-code-agent[bot]" <242468646+Claude@users.noreply.github.com>
Date: Wed, 4 Mar 2026 09:36:43 +0000
Subject: [PATCH 04/12] Fix legacy sendBox bridge types and build errors

Co-authored-by: compulim <1622400+compulim@users.noreply.github.com>
---
 packages/api/src/legacy/LegacySendBoxBridge.tsx    | 14 ++++++--------
 .../createSendBoxPolymiddlewareFromLegacy.tsx      | 13 ++++++++-----
 2 files changed, 14 insertions(+), 13 deletions(-)

diff --git a/packages/api/src/legacy/LegacySendBoxBridge.tsx b/packages/api/src/legacy/LegacySendBoxBridge.tsx
index 74e6e6330f..7e75fd510f 100644
--- a/packages/api/src/legacy/LegacySendBoxBridge.tsx
+++ b/packages/api/src/legacy/LegacySendBoxBridge.tsx
@@ -1,5 +1,5 @@
 import { validateProps } from '@msinternal/botframework-webchat-react-valibot';
-import React, { Fragment, memo } from 'react';
+import React, { Fragment, memo, useMemo } from 'react';
 
 import { legacySendBoxBridgeComponentPropsSchema, type LegacySendBoxBridgeComponentProps } from './createSendBoxPolymiddlewareFromLegacy';
 
@@ -7,16 +7,14 @@ import { legacySendBoxBridgeComponentPropsSchema, type LegacySendBoxBridgeCompon
  * This component is solely for `createSendBoxPolymiddlewareFromLegacy`.
  *
  * @param props Legacy sendBox middleware props, includes `className` and `render`.
- * @returns A sendBox node rendered using the `props.render` component.
+ * @returns A sendBox node rendered using the `props.render` function.
  */
 function LegacySendBoxBridge(props: LegacySendBoxBridgeComponentProps) {
-  const { className, render: RenderComponent } = validateProps(legacySendBoxBridgeComponentPropsSchema, props);
+  const { className, render } = validateProps(legacySendBoxBridgeComponentPropsSchema, props);
 
-  return (
-    <Fragment>
-      <RenderComponent className={className} />
-    </Fragment>
-  );
+  const children = useMemo(() => render({ className }), [className, render]);
+
+  return <Fragment>{children}</Fragment>;
 }
 
 export default memo(LegacySendBoxBridge);
diff --git a/packages/api/src/legacy/createSendBoxPolymiddlewareFromLegacy.tsx b/packages/api/src/legacy/createSendBoxPolymiddlewareFromLegacy.tsx
index 34ebd122a7..6f9ee5a8ac 100644
--- a/packages/api/src/legacy/createSendBoxPolymiddlewareFromLegacy.tsx
+++ b/packages/api/src/legacy/createSendBoxPolymiddlewareFromLegacy.tsx
@@ -4,13 +4,14 @@ import {
   type SendBoxPolymiddleware
 } from '@msinternal/botframework-webchat-api-middleware';
 import { type LegacySendBoxMiddleware } from '@msinternal/botframework-webchat-api-middleware/legacy';
-import { composeEnhancer } from 'handler-chain';
-import { type ComponentType } from 'react';
+import { composeEnhancer, type Enhancer } from 'handler-chain';
+import { type ReactNode } from 'react';
 import { custom, function_, never, object, optional, pipe, readonly, safeParse, string, type InferInput } from 'valibot';
 
 import LegacySendBoxBridge from './LegacySendBoxBridge';
 
-type LegacySendBoxRenderFunction = ComponentType<{ readonly className?: string | undefined }>;
+type LegacySendBoxRenderFunction = (props: { readonly className?: string | undefined }) => ReactNode;
+type LegacySendBoxComponent = ReactNode;
 
 const legacySendBoxBridgeComponentPropsSchema = pipe(
   object({
@@ -35,7 +36,9 @@ type LegacySendBoxBridgeComponentProps = Readonly<
 function createSendBoxPolymiddlewareFromLegacy(
   ...middleware: readonly LegacySendBoxMiddleware[]
 ): SendBoxPolymiddleware {
-  const legacyEnhancer = composeEnhancer(...middleware.map(middleware => middleware()));
+  const legacyEnhancer: Enhancer<LegacySendBoxComponent, void> = composeEnhancer<LegacySendBoxComponent, void>(
+    ...(middleware.map(middleware => middleware()) as Enhancer<LegacySendBoxComponent, void>[])
+  );
 
   return createSendBoxPolymiddleware(next => {
     const legacyHandler = legacyEnhancer(() => {
@@ -47,7 +50,7 @@ function createSendBoxPolymiddlewareFromLegacy(
     return () => {
       const legacyResult = legacyHandler();
 
-      return legacyResult ? sendBoxComponent(LegacySendBoxBridge, { render: legacyResult() }) : undefined;
+      return legacyResult ? sendBoxComponent(LegacySendBoxBridge, { render: () => legacyResult }) : undefined;
     };
   });
 }

From 627f5284b4237de8fbec1589c418b4ee80f12342 Mon Sep 17 00:00:00 2001
From: "anthropic-code-agent[bot]" <242468646+Claude@users.noreply.github.com>
Date: Wed, 4 Mar 2026 10:00:06 +0000
Subject: [PATCH 05/12] Update deprecation dates, fix error message case, add
 displayName, revert package-lock.json

Co-authored-by: compulim <1622400+compulim@users.noreply.github.com>
---
 package-lock.json                             | 72 ++++++++++++-------
 .../src/sendBoxPolymiddleware.tsx             |  2 +-
 packages/api/src/index.ts                     |  4 +-
 .../api/src/legacy/LegacySendBoxBridge.tsx    |  2 +
 .../createSendBoxPolymiddlewareFromLegacy.tsx |  2 +-
 .../api/src/middleware/SendBoxMiddleware.ts   |  8 +--
 6 files changed, 57 insertions(+), 33 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index dbad523745..d47ce3fe61 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -336,6 +336,7 @@
       "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.28.5.tgz",
       "integrity": "sha512-e7jT4DxYvIDLk1ZHmU/m/mB19rex9sv0c2ftBtjSBv+kVM/902eh0fINUzD7UwLLNR+jU585GxUJ8/EBfAM5fw==",
       "devOptional": true,
+      "peer": true,
       "dependencies": {
         "@babel/code-frame": "^7.27.1",
         "@babel/generator": "^7.28.5",
@@ -3303,6 +3304,7 @@
       "version": "29.7.0",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@jest/fake-timers": "^29.7.0",
         "@jest/types": "^29.6.3",
@@ -3340,6 +3342,7 @@
       "version": "29.7.0",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@jest/types": "^29.6.3",
         "@sinonjs/fake-timers": "^10.0.2",
@@ -3629,6 +3632,7 @@
       "version": "29.6.3",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@jest/schemas": "^29.6.3",
         "@types/istanbul-lib-coverage": "^2.0.0",
@@ -5227,6 +5231,7 @@
       "version": "16.14.68",
       "resolved": "https://registry.npmjs.org/@types/react/-/react-16.14.68.tgz",
       "integrity": "sha512-GEe60JEJg7wIvnUzXBX/A++ieyum98WXF/q2oFr1RVar8OK8JxU/uEYBXgv7jF87SoaDdxtAq3KUaJFlu02ziw==",
+      "peer": true,
       "dependencies": {
         "@types/prop-types": "*",
         "@types/scheduler": "^0.16",
@@ -5237,6 +5242,7 @@
       "version": "16.9.25",
       "resolved": "https://registry.npmjs.org/@types/react-dom/-/react-dom-16.9.25.tgz",
       "integrity": "sha512-ZK//eAPhwft9Ul2/Zj+6O11YR6L4JX0J2sVeBC9Ft7x7HFN7xk7yUV/zDxqV6rjvqgl6r8Dq7oQImxtyf/Mzcw==",
+      "peer": true,
       "peerDependencies": {
         "@types/react": "^16.0.0"
       }
@@ -5378,6 +5384,7 @@
       "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-8.50.0.tgz",
       "integrity": "sha512-6/cmF2piao+f6wSxUsJLZjck7OQsYyRtcOZS02k7XINSNlz93v6emM8WutDQSXnroG2xwYlEVHJI+cPA7CPM3Q==",
       "dev": true,
+      "peer": true,
       "dependencies": {
         "@typescript-eslint/scope-manager": "8.50.0",
         "@typescript-eslint/types": "8.50.0",
@@ -5808,6 +5815,7 @@
       "version": "8.15.0",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "bin": {
         "acorn": "bin/acorn"
       },
@@ -6202,6 +6210,7 @@
     "node_modules/asn1.js": {
       "version": "5.4.1",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "bn.js": "^4.0.0",
         "inherits": "^2.0.1",
@@ -6276,8 +6285,7 @@
     "node_modules/asynckit": {
       "version": "0.4.0",
       "dev": true,
-      "license": "MIT",
-      "peer": true
+      "license": "MIT"
     },
     "node_modules/available-typed-arrays": {
       "version": "1.0.7",
@@ -6306,7 +6314,6 @@
       "resolved": "https://registry.npmjs.org/axios/-/axios-1.13.2.tgz",
       "integrity": "sha512-VPk9ebNqPcy5lRGuSlKx752IlDatOjT9paPlm8A7yOuW2Fbvp4X3JznJtT4f0GzGLLiWE9W8onz51SqLYwzGaA==",
       "dev": true,
-      "peer": true,
       "dependencies": {
         "follow-redirects": "^1.15.6",
         "form-data": "^4.0.4",
@@ -6901,6 +6908,7 @@
           "url": "https://github.com/sponsors/ai"
         }
       ],
+      "peer": true,
       "dependencies": {
         "baseline-browser-mapping": "^2.9.0",
         "caniuse-lite": "^1.0.30001759",
@@ -6949,7 +6957,6 @@
       "version": "0.2.13",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "engines": {
         "node": "*"
       }
@@ -7275,7 +7282,6 @@
           "url": "https://github.com/rxaviers/cldr-data-npm/blob/master/LICENSE"
         }
       ],
-      "peer": true,
       "dependencies": {
         "cldr-data-downloader": "1.1.0",
         "glob": "10.3.12"
@@ -7284,7 +7290,6 @@
     "node_modules/cldr-data-downloader": {
       "version": "1.1.0",
       "dev": true,
-      "peer": true,
       "dependencies": {
         "axios": "^1.7.2",
         "mkdirp": "^1.0.4",
@@ -7299,14 +7304,12 @@
     "node_modules/cldr-data-downloader/node_modules/abbrev": {
       "version": "1.1.1",
       "dev": true,
-      "license": "ISC",
-      "peer": true
+      "license": "ISC"
     },
     "node_modules/cldr-data-downloader/node_modules/nopt": {
       "version": "3.0.6",
       "dev": true,
       "license": "ISC",
-      "peer": true,
       "dependencies": {
         "abbrev": "1"
       },
@@ -7318,7 +7321,6 @@
       "version": "1.0.1",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "engines": {
         "node": ">=0.6.0",
         "teleport": ">=0.2.0"
@@ -7328,7 +7330,6 @@
       "version": "10.3.12",
       "dev": true,
       "license": "ISC",
-      "peer": true,
       "dependencies": {
         "foreground-child": "^3.1.0",
         "jackspeak": "^2.3.6",
@@ -7350,7 +7351,6 @@
       "version": "2.3.6",
       "dev": true,
       "license": "BlueOak-1.0.0",
-      "peer": true,
       "dependencies": {
         "@isaacs/cliui": "^8.0.2"
       },
@@ -7369,7 +7369,6 @@
       "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-9.0.5.tgz",
       "integrity": "sha512-G6T0ZX48xgozx7587koeX9Ys2NYy6Gmv//P89sEte9V9whIapMNF4idKxnW2QtCcLiTWlb/wfCabAtAFWhhBow==",
       "dev": true,
-      "peer": true,
       "dependencies": {
         "brace-expansion": "^2.0.1"
       },
@@ -7571,7 +7570,6 @@
       "version": "1.0.8",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "delayed-stream": "~1.0.0"
       },
@@ -7825,6 +7823,7 @@
       "resolved": "https://registry.npmjs.org/core-js-pure/-/core-js-pure-3.47.0.tgz",
       "integrity": "sha512-BcxeDbzUrRnXGYIVAGFtcGQVNpFcUhVjr6W7F8XktvQW2iJP9e66GP6xdKotCRFlrxBvNIBrhwKteRXqMV86Nw==",
       "hasInstallScript": true,
+      "peer": true,
       "funding": {
         "type": "opencollective",
         "url": "https://opencollective.com/core-js"
@@ -8190,7 +8189,6 @@
       "version": "1.0.0",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "engines": {
         "node": ">=0.4.0"
       }
@@ -8739,6 +8737,7 @@
       "integrity": "sha512-HyNQImnsOC7X9PMNaCIeAm4ISCQXs5a5YasTXVliKv4uuBo1dKrG0A+uQS8M5eXjVMnLg3WgXaKvprHlFJQffw==",
       "dev": true,
       "hasInstallScript": true,
+      "peer": true,
       "bin": {
         "esbuild": "bin/esbuild"
       },
@@ -8804,6 +8803,7 @@
       "integrity": "sha512-ypowyDxpVSYpkXr9WPv2PAZCtNip1Mv5KTW0SCurXv/9iOpcrH9PaqUElksqEB6pChqHGDRCFTyrZlGhnLNGiA==",
       "deprecated": "This version is no longer supported. Please see https://eslint.org/version-support for other options.",
       "dev": true,
+      "peer": true,
       "dependencies": {
         "@eslint-community/eslint-utils": "^4.2.0",
         "@eslint-community/regexpp": "^4.6.1",
@@ -8859,6 +8859,7 @@
       "resolved": "https://registry.npmjs.org/eslint-config-prettier/-/eslint-config-prettier-10.1.8.tgz",
       "integrity": "sha512-82GZUjRS0p/jganf6q1rEO25VSoHH0hKPCTrgillPjdI/3bgBhAE1QzHrHTizjpRvy6pGAvKjDJtk2pF9NDq8w==",
       "dev": true,
+      "peer": true,
       "bin": {
         "eslint-config-prettier": "bin/cli.js"
       },
@@ -9788,7 +9789,6 @@
       "version": "1.1.0",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "pend": "~1.2.0"
       }
@@ -9965,7 +9965,6 @@
       "version": "4.0.4",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "asynckit": "^0.4.0",
         "combined-stream": "^1.0.8",
@@ -10255,6 +10254,7 @@
       "version": "1.7.1",
       "resolved": "https://registry.npmjs.org/globalize/-/globalize-1.7.1.tgz",
       "integrity": "sha512-PFymRL0PtitFOlSniuwwwNfkooi3cLQJo9Uke1+j1DsGfUkkHkwneImqVtGcqKI0TuzhAlHt7hAcgK324902HA==",
+      "peer": true,
       "dependencies": {
         "cldrjs": "^0.5.4"
       }
@@ -10496,6 +10496,7 @@
       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/handler-chain/-/handler-chain-0.1.1.tgz",
       "integrity": "sha512-5eo8F9UTUiFCMtDUF1ipva1tvOCGE+vFr33aFHSISjTqXfGywCRV2aE6TzPkMhaw1pArOv3wv2Wz3Rh+AJJ8bA==",
+      "peer": true,
       "dependencies": {
         "handler-chain": "^0.1.1"
       }
@@ -10910,7 +10911,8 @@
       "version": "2019.1.0",
       "resolved": "https://registry.npmjs.org/iana-tz-data/-/iana-tz-data-2019.1.0.tgz",
       "integrity": "sha512-T7+26Skkyxqjp4mg20/O065j9J5qP39nWVQj/2ArxQ0gSPkL+T9lwerRmiOAzFRNsNXepX45QqchqTVENwNvig==",
-      "dev": true
+      "dev": true,
+      "peer": true
     },
     "node_modules/iconv-lite": {
       "version": "0.6.3",
@@ -11767,6 +11769,7 @@
       "version": "0.3.0",
       "resolved": "https://registry.npmjs.org/iter-fest/-/iter-fest-0.3.0.tgz",
       "integrity": "sha512-t76cnHCl9MEZRaUb0VBwTXP8dWjxbcTYm91VGWfQYjSMXKkjdOAIjUsaMYuLIy9jxk9fT55XIlb4Y/HACK/zlw==",
+      "peer": true,
       "dependencies": {
         "iter-fest": "^0.3.0"
       },
@@ -12741,6 +12744,7 @@
       "version": "29.7.0",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@jest/types": "^29.6.3",
         "@types/node": "*",
@@ -13122,6 +13126,7 @@
       "version": "29.7.0",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@jest/types": "^29.6.3",
         "@types/node": "*",
@@ -14920,6 +14925,7 @@
       "version": "1.17.0",
       "resolved": "https://registry.npmjs.org/microsoft-cognitiveservices-speech-sdk/-/microsoft-cognitiveservices-speech-sdk-1.17.0.tgz",
       "integrity": "sha512-RVUCpTeu1g+R4HB/PaLQmEfsdHzwEa6+2phgCiPA4lGIiR7ILEL7qZHHUWAG6W4zcjnWeiLnL7tVgMbyd5XGgA==",
+      "peer": true,
       "dependencies": {
         "agent-base": "^6.0.1",
         "asn1.js-rfc2560": "^5.0.1",
@@ -15122,7 +15128,6 @@
       "version": "1.0.4",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "bin": {
         "mkdirp": "bin/cmd.js"
       },
@@ -15301,6 +15306,7 @@
       "version": "8.0.2",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "growly": "^1.3.0",
         "is-wsl": "^2.2.0",
@@ -15835,8 +15841,7 @@
     "node_modules/pend": {
       "version": "1.2.0",
       "dev": true,
-      "license": "MIT",
-      "peer": true
+      "license": "MIT"
     },
     "node_modules/picocolors": {
       "version": "1.1.1",
@@ -15971,6 +15976,7 @@
         }
       ],
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "nanoid": "^3.3.7",
         "picocolors": "^1.1.0",
@@ -16092,6 +16098,7 @@
       "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.7.4.tgz",
       "integrity": "sha512-v6UNi1+3hSlVvv8fSaoUbggEM5VErKmmpGA7Pl3HF8V6uKY7rvClBOJlH6yNwQtfTueNkGVpOv/mtWL9L4bgRA==",
       "dev": true,
+      "peer": true,
       "bin": {
         "prettier": "bin/prettier.cjs"
       },
@@ -16200,8 +16207,7 @@
     "node_modules/proxy-from-env": {
       "version": "1.1.0",
       "dev": true,
-      "license": "MIT",
-      "peer": true
+      "license": "MIT"
     },
     "node_modules/prr": {
       "version": "1.0.1",
@@ -16367,6 +16373,7 @@
       "version": "16.8.6",
       "resolved": "https://registry.npmjs.org/react/-/react-16.8.6.tgz",
       "integrity": "sha512-pC0uMkhLaHm11ZSJULfOBqV4tIZkx87ZLvbbQYunNixAAvjnC+snJCg0XQXn9VIsttVsbZP/H/ewzgsd5fxKXw==",
+      "peer": true,
       "dependencies": {
         "loose-envify": "^1.1.0",
         "object-assign": "^4.1.1",
@@ -16381,6 +16388,7 @@
       "version": "0.4.2",
       "resolved": "https://registry.npmjs.org/react-chain-of-responsibility/-/react-chain-of-responsibility-0.4.2.tgz",
       "integrity": "sha512-khBaWO1rSLSUw6Ydr3lYFgONwmrx9rSOClrLCyn7cq40QxVJSh5utq1rbey+Pr24trWmQdC9qweTuKG2RptTXw==",
+      "peer": true,
       "dependencies": {
         "handler-chain": "^0.1.0",
         "react-chain-of-responsibility": "^0.4.2",
@@ -16408,6 +16416,7 @@
       "version": "16.8.6",
       "resolved": "https://registry.npmjs.org/react-dom/-/react-dom-16.8.6.tgz",
       "integrity": "sha512-1nL7PIq9LTL3fthPqwkvr2zY7phIPjYrT0jp4HjyEQrEROnw4dG41VVwi/wfoCneoleqrNX7iAD+pXebJZwrwA==",
+      "peer": true,
       "dependencies": {
         "loose-envify": "^1.1.0",
         "object-assign": "^4.1.1",
@@ -16792,7 +16801,8 @@
     "node_modules/redux": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/redux/-/redux-5.0.1.tgz",
-      "integrity": "sha512-M9/ELqF6fy8FwmkpnF0S3YKOqMyoWJ4+CS5Efg2ct3oY9daQvd/Pc71FpGZsVsbl3Cpb+IIcjBDUnnyBdQbq4w=="
+      "integrity": "sha512-M9/ELqF6fy8FwmkpnF0S3YKOqMyoWJ4+CS5Efg2ct3oY9daQvd/Pc71FpGZsVsbl3Cpb+IIcjBDUnnyBdQbq4w==",
+      "peer": true
     },
     "node_modules/redux-saga": {
       "version": "1.4.2",
@@ -17126,6 +17136,7 @@
       "version": "4.46.2",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@types/estree": "1.0.8"
       },
@@ -17429,6 +17440,7 @@
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-8.17.1.tgz",
       "integrity": "sha512-B/gBuNg5SiMTrPkC+A2+cW0RszwxYmn6VYxB/inlBStS5nx6xHIt/ehKRhIMhqusl7a8LjQoZnjCs5vhwxOQ1g==",
       "dev": true,
+      "peer": true,
       "dependencies": {
         "fast-deep-equal": "^3.1.3",
         "fast-uri": "^3.0.1",
@@ -18896,6 +18908,7 @@
       "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.3.tgz",
       "integrity": "sha512-5gTmgEY/sqK6gFXLIsQNH19lWb4ebPDLA4SdLP7dsWkIXHWlG66oPuVvXSGFPppYZz8ZDZq0dYYrbHfBCVUb1Q==",
       "dev": true,
+      "peer": true,
       "engines": {
         "node": ">=12"
       },
@@ -19313,6 +19326,7 @@
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
       "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
       "devOptional": true,
+      "peer": true,
       "bin": {
         "tsc": "bin/tsc",
         "tsserver": "bin/tsserver"
@@ -19734,6 +19748,7 @@
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/use-ref-from/-/use-ref-from-0.1.0.tgz",
       "integrity": "sha512-PRjmfhUGUKghhOjKV1dBU66M7CASdb4NkMsaaWLdJA81yOZFlVL7Pi3O9aD+68pRh0VrRQjZfS6Ux3vPy1VhRg==",
+      "peer": true,
       "dependencies": {
         "@babel/runtime-corejs3": "^7.24.1",
         "use-ref-from": "^0.1.0"
@@ -19768,6 +19783,7 @@
       "version": "8.3.2",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-8.3.2.tgz",
       "integrity": "sha512-+NYs2QeMWy+GWFOEm9xnn6HCDp0l7QBD7ml8zLUmJ+93Q5NF0NocErnwkTkXVFNiX3/fpC6afS8Dhb/gz7R7eg==",
+      "peer": true,
       "bin": {
         "uuid": "dist/bin/uuid"
       }
@@ -19789,6 +19805,7 @@
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/valibot/-/valibot-1.2.0.tgz",
       "integrity": "sha512-mm1rxUsmOxzrwnX5arGS+U4T25RdvpPjPN4yR0u9pUBov9+zGVtO84tif1eY4r6zWxVxu3KzIyknJy3rxfRZZg==",
+      "peer": true,
       "peerDependencies": {
         "typescript": ">=5"
       },
@@ -19894,6 +19911,7 @@
       "resolved": "https://registry.npmjs.org/webpack/-/webpack-5.104.1.tgz",
       "integrity": "sha512-Qphch25abbMNtekmEGJmeRUhLDbe+QfiWTiqpKYkpCOWY64v9eyl+KRRLmqOFA2AvKPpc9DC6+u2n76tQLBoaA==",
       "dev": true,
+      "peer": true,
       "dependencies": {
         "@types/eslint-scope": "^3.7.7",
         "@types/estree": "^1.0.8",
@@ -19942,6 +19960,7 @@
       "resolved": "https://registry.npmjs.org/webpack-cli/-/webpack-cli-6.0.1.tgz",
       "integrity": "sha512-MfwFQ6SfwinsUVi0rNJm7rHZ31GyTcpVE5pgVA3hwFRb7COD4TzjUUwhGWKfO50+xdc2MQPuEBBJoqIMGt3JDw==",
       "dev": true,
+      "peer": true,
       "dependencies": {
         "@discoveryjs/json-ext": "^0.6.1",
         "@webpack-cli/configtest": "^3.0.1",
@@ -20473,7 +20492,6 @@
       "version": "2.10.0",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "buffer-crc32": "~0.2.3",
         "fd-slicer": "~1.1.0"
@@ -20495,6 +20513,7 @@
       "resolved": "https://registry.npmjs.org/zod/-/zod-4.2.1.tgz",
       "integrity": "sha512-0wZ1IRqGGhMP76gLqz8EyfBXKk0J2qo2+H3fi4mcUP/KtTocoX08nmIAHl1Z2kJIZbZee8KOpBCSNPRgauucjw==",
       "dev": true,
+      "peer": true,
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"
       }
@@ -21805,6 +21824,7 @@
         "react": "^18.3.1",
         "react-dom": "^18.3.1"
       },
+      "devDependencies": {},
       "engines": {
         "node": ">= 14.0.0"
       }
@@ -21902,6 +21922,7 @@
       "resolved": "https://registry.npmjs.org/react/-/react-18.3.1.tgz",
       "integrity": "sha512-wS+hAgJShR0KhEvPJArfuPVN1+Hz1t0Y6n5jLrGQbkb4urgPE/0Rve+1kMB1v/oWgHgm4WIcV+i7F2pTVj+2iQ==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "loose-envify": "^1.1.0"
       },
@@ -21914,6 +21935,7 @@
       "resolved": "https://registry.npmjs.org/react-dom/-/react-dom-18.3.1.tgz",
       "integrity": "sha512-5m4nQKp+rZRb09LNH59GM4BxTh9251/ylbKIbpe7TpGxfJ+9kv6BLkLBXIjjspbgbnIBNqlI23tRnTWT0snUIw==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "loose-envify": "^1.1.0",
         "scheduler": "^0.23.2"
diff --git a/packages/api-middleware/src/sendBoxPolymiddleware.tsx b/packages/api-middleware/src/sendBoxPolymiddleware.tsx
index aeb8b6d7c4..cdc2a9203d 100644
--- a/packages/api-middleware/src/sendBoxPolymiddleware.tsx
+++ b/packages/api-middleware/src/sendBoxPolymiddleware.tsx
@@ -56,7 +56,7 @@ const SendBoxPolymiddlewareProvider = memo(function SendBoxPolymiddlewareProvide
         createErrorBoundaryMiddleware({
           createMiddleware: createSendBoxPolymiddleware,
           reactComponent: sendBoxComponent,
-          where: 'SendBox polymiddleware'
+          where: 'send box polymiddleware'
         }),
         ...middleware
       ]),
diff --git a/packages/api/src/index.ts b/packages/api/src/index.ts
index e6485dd7ae..84c3ad57d5 100644
--- a/packages/api/src/index.ts
+++ b/packages/api/src/index.ts
@@ -6,9 +6,9 @@ export type {
   /** @deprecated Use `polymiddleware` instead, this will be removed on or after 2027-08-16. */
   LegacyAttachmentMiddleware as AttachmentMiddleware,
   LegacyRenderAttachment as RenderAttachment,
-  /** @deprecated Use `polymiddleware` instead, this will be removed on or after 2027-08-16. */
+  /** @deprecated Use `polymiddleware` instead, this will be removed on or after 2028-03-04. */
   LegacySendBoxComponentFactory as SendBoxComponentFactory,
-  /** @deprecated Use `polymiddleware` instead, this will be removed on or after 2027-08-16. */
+  /** @deprecated Use `polymiddleware` instead, this will be removed on or after 2028-03-04. */
   LegacySendBoxRenderer as SendBoxRenderer
 } from '@msinternal/botframework-webchat-api-middleware/legacy';
 
diff --git a/packages/api/src/legacy/LegacySendBoxBridge.tsx b/packages/api/src/legacy/LegacySendBoxBridge.tsx
index 7e75fd510f..6276930f03 100644
--- a/packages/api/src/legacy/LegacySendBoxBridge.tsx
+++ b/packages/api/src/legacy/LegacySendBoxBridge.tsx
@@ -17,4 +17,6 @@ function LegacySendBoxBridge(props: LegacySendBoxBridgeComponentProps) {
   return <Fragment>{children}</Fragment>;
 }
 
+LegacySendBoxBridge.displayName = 'LegacySendBoxBridge';
+
 export default memo(LegacySendBoxBridge);
diff --git a/packages/api/src/legacy/createSendBoxPolymiddlewareFromLegacy.tsx b/packages/api/src/legacy/createSendBoxPolymiddlewareFromLegacy.tsx
index 6f9ee5a8ac..a3d6a4a7fd 100644
--- a/packages/api/src/legacy/createSendBoxPolymiddlewareFromLegacy.tsx
+++ b/packages/api/src/legacy/createSendBoxPolymiddlewareFromLegacy.tsx
@@ -29,7 +29,7 @@ type LegacySendBoxBridgeComponentProps = Readonly<
 /**
  * Polyfill legacy sendBox middleware into a polymiddleware.
  *
- * @deprecated Legacy sendBox middleware is being deprecated and will be removed on or after 2027-08-16.
+ * @deprecated Legacy sendBox middleware is being deprecated and will be removed on or after 2028-03-04.
  * @param middleware An array of legacy sendBox middleware.
  * @returns A polymiddleware composed by legacy sendBox middleware.
  */
diff --git a/packages/api/src/middleware/SendBoxMiddleware.ts b/packages/api/src/middleware/SendBoxMiddleware.ts
index ceb41d5a83..d93981f0a9 100644
--- a/packages/api/src/middleware/SendBoxMiddleware.ts
+++ b/packages/api/src/middleware/SendBoxMiddleware.ts
@@ -5,7 +5,7 @@ import templateMiddleware, {
 } from './private/templateMiddleware';
 
 /**
- * @deprecated Legacy sendBox middleware is being deprecated and will be removed on or after 2027-08-16. Use `createSendBoxPolymiddleware` instead.
+ * @deprecated Legacy send box middleware is being deprecated and will be removed on or after 2028-03-04. Use `createSendBoxPolymiddleware` instead.
  */
 const template = templateMiddleware<void, { className?: string | undefined }>('sendBoxMiddleware');
 
@@ -17,17 +17,17 @@ const {
 } = template;
 
 /**
- * @deprecated Legacy sendBox middleware is being deprecated and will be removed on or after 2027-08-16. Use `SendBoxPolymiddleware` instead.
+ * @deprecated Legacy send box middleware is being deprecated and will be removed on or after 2028-03-04 Use `SendBoxPolymiddleware` instead.
  */
 type SendBoxMiddleware = InferMiddleware<typeof template>;
 
 /**
- * @deprecated Legacy sendBox middleware is being deprecated and will be removed on or after 2027-08-16. Use `SendBoxPolymiddlewareProps` instead.
+ * @deprecated Legacy send box middleware is being deprecated and will be removed on or after 2028-03-04. Use `SendBoxPolymiddlewareProps` instead.
  */
 type SendBoxMiddlewareProps = InferProps<typeof template>;
 
 /**
- * @deprecated Legacy sendBox middleware is being deprecated and will be removed on or after 2027-08-16. Use `SendBoxPolymiddlewareRequest` instead.
+ * @deprecated Legacy send box middleware is being deprecated and will be removed on or after 2028-03-04. Use `SendBoxPolymiddlewareRequest` instead.
  */
 type SendBoxMiddlewareRequest = InferRequest<typeof template>;
 

From 3a8aaa46a6a6beb352422c008e6081d5a9f9692b Mon Sep 17 00:00:00 2001
From: "anthropic-code-agent[bot]" <242468646+Claude@users.noreply.github.com>
Date: Wed, 4 Mar 2026 10:01:54 +0000
Subject: [PATCH 06/12] Add comprehensive test suite for sendBox middleware
 patterns

Co-authored-by: compulim <1622400+compulim@users.noreply.github.com>
---
 .../sendBox/legacySendBoxMiddleware/add.html  | 59 ++++++++++++++++++
 .../legacySendBoxMiddleware/change.html       | 56 +++++++++++++++++
 .../legacySendBoxMiddleware/decorate.html     | 54 +++++++++++++++++
 .../legacySendBoxMiddleware/remove.html       | 52 ++++++++++++++++
 .../sendBox/polymiddleware/add.html           | 60 +++++++++++++++++++
 .../sendBox/polymiddleware/change.html        | 56 +++++++++++++++++
 .../sendBox/polymiddleware/decorate.html      | 59 ++++++++++++++++++
 .../sendBox/polymiddleware/remove.html        | 54 +++++++++++++++++
 8 files changed, 450 insertions(+)
 create mode 100644 __tests__/html2/middleware/sendBox/legacySendBoxMiddleware/add.html
 create mode 100644 __tests__/html2/middleware/sendBox/legacySendBoxMiddleware/change.html
 create mode 100644 __tests__/html2/middleware/sendBox/legacySendBoxMiddleware/decorate.html
 create mode 100644 __tests__/html2/middleware/sendBox/legacySendBoxMiddleware/remove.html
 create mode 100644 __tests__/html2/middleware/sendBox/polymiddleware/add.html
 create mode 100644 __tests__/html2/middleware/sendBox/polymiddleware/change.html
 create mode 100644 __tests__/html2/middleware/sendBox/polymiddleware/decorate.html
 create mode 100644 __tests__/html2/middleware/sendBox/polymiddleware/remove.html

diff --git a/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/add.html b/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/add.html
new file mode 100644
index 0000000000..977a620e6f
--- /dev/null
+++ b/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/add.html
@@ -0,0 +1,59 @@
+<!doctype html>
+<html lang="en-US">
+   <head>
+      <link href="/assets/index.css" rel="stylesheet" type="text/css" />
+      <script type="importmap">
+         {
+            "imports": {
+               "react": "https://esm.sh/react@18.3.1"
+            }
+         }
+      </script>
+      <script crossorigin="anonymous" src="/test-harness.js"></script>
+      <script crossorigin="anonymous" src="/test-page-object.js"></script>
+      <script crossorigin="anonymous" src="/__dist__/webchat-es5.js"></script>
+   </head>
+
+   <body>
+      <main id="webchat"></main>
+      <script type="module">
+         import { createElement } from 'react';
+
+         run(async function () {
+            const {
+               testHelpers: { createDirectLineEmulator },
+               WebChat: {
+                  middleware: { createSendBoxPolymiddlewareFromLegacy }
+               }
+            } = window;
+
+            const { directLine, store } = createDirectLineEmulator();
+
+            const AdditionalComponent = () => createElement('div', { style: { border: 'solid 2px green', padding: '10px' } }, 'Additional Component');
+
+            const polymiddleware = [
+               createSendBoxPolymiddlewareFromLegacy(() => next => () => {
+                  const child = next();
+                  return () => createElement('div', {}, [
+                     child?.(),
+                     createElement(AdditionalComponent, { key: 'additional' })
+                  ]);
+               })
+            ];
+
+            WebChat.renderWebChat(
+               {
+                  directLine,
+                  polymiddleware,
+                  store
+               },
+               document.getElementById('webchat')
+            );
+
+            await pageConditions.uiConnected();
+
+            await host.snapshot('local');
+         });
+      </script>
+   </body>
+</html>
diff --git a/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/change.html b/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/change.html
new file mode 100644
index 0000000000..98d6d46ee8
--- /dev/null
+++ b/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/change.html
@@ -0,0 +1,56 @@
+<!doctype html>
+<html lang="en-US">
+   <head>
+      <link href="/assets/index.css" rel="stylesheet" type="text/css" />
+      <script type="importmap">
+         {
+            "imports": {
+               "react": "https://esm.sh/react@18.3.1"
+            }
+         }
+      </script>
+      <script crossorigin="anonymous" src="/test-harness.js"></script>
+      <script crossorigin="anonymous" src="/test-page-object.js"></script>
+      <script crossorigin="anonymous" src="/__dist__/webchat-es5.js"></script>
+   </head>
+
+   <body>
+      <main id="webchat"></main>
+      <script type="module">
+         import { createElement } from 'react';
+
+         run(async function () {
+            const {
+               testHelpers: { createDirectLineEmulator },
+               WebChat: {
+                  middleware: { createSendBoxPolymiddlewareFromLegacy }
+               }
+            } = window;
+
+            const { directLine, store } = createDirectLineEmulator();
+
+            const CustomSendBox = ({ className }) => createElement('div', { className, style: { border: 'solid 2px purple', padding: '10px' } }, 'Custom SendBox');
+
+            const polymiddleware = [
+               createSendBoxPolymiddlewareFromLegacy(() => next => () => {
+                  // Replace with custom component
+                  return () => createElement(CustomSendBox);
+               })
+            ];
+
+            WebChat.renderWebChat(
+               {
+                  directLine,
+                  polymiddleware,
+                  store
+               },
+               document.getElementById('webchat')
+            );
+
+            await pageConditions.uiConnected();
+
+            await host.snapshot('local');
+         });
+      </script>
+   </body>
+</html>
diff --git a/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/decorate.html b/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/decorate.html
new file mode 100644
index 0000000000..5e2d80519f
--- /dev/null
+++ b/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/decorate.html
@@ -0,0 +1,54 @@
+<!doctype html>
+<html lang="en-US">
+   <head>
+      <link href="/assets/index.css" rel="stylesheet" type="text/css" />
+      <script type="importmap">
+         {
+            "imports": {
+               "react": "https://esm.sh/react@18.3.1"
+            }
+         }
+      </script>
+      <script crossorigin="anonymous" src="/test-harness.js"></script>
+      <script crossorigin="anonymous" src="/test-page-object.js"></script>
+      <script crossorigin="anonymous" src="/__dist__/webchat-es5.js"></script>
+   </head>
+
+   <body>
+      <main id="webchat"></main>
+      <script type="module">
+         import { createElement } from 'react';
+
+         run(async function () {
+            const {
+               testHelpers: { createDirectLineEmulator },
+               WebChat: {
+                  middleware: { createSendBoxPolymiddlewareFromLegacy }
+               }
+            } = window;
+
+            const { directLine, store } = createDirectLineEmulator();
+
+            const polymiddleware = [
+               createSendBoxPolymiddlewareFromLegacy(() => next => () => {
+                  const child = next();
+                  return () => createElement('div', { style: { border: 'solid 2px blue' } }, child?.());
+               })
+            ];
+
+            WebChat.renderWebChat(
+               {
+                  directLine,
+                  polymiddleware,
+                  store
+               },
+               document.getElementById('webchat')
+            );
+
+            await pageConditions.uiConnected();
+
+            await host.snapshot('local');
+         });
+      </script>
+   </body>
+</html>
diff --git a/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/remove.html b/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/remove.html
new file mode 100644
index 0000000000..c0ee76c182
--- /dev/null
+++ b/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/remove.html
@@ -0,0 +1,52 @@
+<!doctype html>
+<html lang="en-US">
+   <head>
+      <link href="/assets/index.css" rel="stylesheet" type="text/css" />
+      <script type="importmap">
+         {
+            "imports": {
+               "react": "https://esm.sh/react@18.3.1"
+            }
+         }
+      </script>
+      <script crossorigin="anonymous" src="/test-harness.js"></script>
+      <script crossorigin="anonymous" src="/test-page-object.js"></script>
+      <script crossorigin="anonymous" src="/__dist__/webchat-es5.js"></script>
+   </head>
+
+   <body>
+      <main id="webchat"></main>
+      <script type="module">
+         run(async function () {
+            const {
+               testHelpers: { createDirectLineEmulator },
+               WebChat: {
+                  middleware: { createSendBoxPolymiddlewareFromLegacy }
+               }
+            } = window;
+
+            const { directLine, store } = createDirectLineEmulator();
+
+            const polymiddleware = [
+               createSendBoxPolymiddlewareFromLegacy(() => next => () => {
+                  // Don't call next, effectively removing the sendbox
+                  return () => null;
+               })
+            ];
+
+            WebChat.renderWebChat(
+               {
+                  directLine,
+                  polymiddleware,
+                  store
+               },
+               document.getElementById('webchat')
+            );
+
+            await pageConditions.uiConnected();
+
+            await host.snapshot('local');
+         });
+      </script>
+   </body>
+</html>
diff --git a/__tests__/html2/middleware/sendBox/polymiddleware/add.html b/__tests__/html2/middleware/sendBox/polymiddleware/add.html
new file mode 100644
index 0000000000..2bf07947ef
--- /dev/null
+++ b/__tests__/html2/middleware/sendBox/polymiddleware/add.html
@@ -0,0 +1,60 @@
+<!doctype html>
+<html lang="en-US">
+   <head>
+      <link href="/assets/index.css" rel="stylesheet" type="text/css" />
+      <script type="importmap">
+         {
+            "imports": {
+               "react": "https://esm.sh/react@18.3.1"
+            }
+         }
+      </script>
+      <script crossorigin="anonymous" src="/test-harness.js"></script>
+      <script crossorigin="anonymous" src="/test-page-object.js"></script>
+      <script crossorigin="anonymous" src="/__dist__/webchat-es5.js"></script>
+   </head>
+
+   <body>
+      <main id="webchat"></main>
+      <script type="module">
+         import { createElement } from 'react';
+
+         run(async function () {
+            const {
+               testHelpers: { createDirectLineEmulator },
+               WebChat: {
+                  middleware: { createSendBoxPolymiddleware, sendBoxComponent }
+               }
+            } = window;
+
+            const { directLine, store } = createDirectLineEmulator();
+
+            const AdditionalComponent = () => createElement('div', { style: { border: 'solid 2px green', padding: '10px' } }, 'Additional Component');
+
+            const polymiddleware = [
+               createSendBoxPolymiddleware(next => () => {
+                  const result = next();
+
+                  return sendBoxComponent(() => createElement('div', {}, [
+                     result?.render({}),
+                     createElement(AdditionalComponent, { key: 'additional' })
+                  ]));
+               })
+            ];
+
+            WebChat.renderWebChat(
+               {
+                  directLine,
+                  polymiddleware,
+                  store
+               },
+               document.getElementById('webchat')
+            );
+
+            await pageConditions.uiConnected();
+
+            await host.snapshot('local');
+         });
+      </script>
+   </body>
+</html>
diff --git a/__tests__/html2/middleware/sendBox/polymiddleware/change.html b/__tests__/html2/middleware/sendBox/polymiddleware/change.html
new file mode 100644
index 0000000000..3b594755a3
--- /dev/null
+++ b/__tests__/html2/middleware/sendBox/polymiddleware/change.html
@@ -0,0 +1,56 @@
+<!doctype html>
+<html lang="en-US">
+   <head>
+      <link href="/assets/index.css" rel="stylesheet" type="text/css" />
+      <script type="importmap">
+         {
+            "imports": {
+               "react": "https://esm.sh/react@18.3.1"
+            }
+         }
+      </script>
+      <script crossorigin="anonymous" src="/test-harness.js"></script>
+      <script crossorigin="anonymous" src="/test-page-object.js"></script>
+      <script crossorigin="anonymous" src="/__dist__/webchat-es5.js"></script>
+   </head>
+
+   <body>
+      <main id="webchat"></main>
+      <script type="module">
+         import { createElement } from 'react';
+
+         run(async function () {
+            const {
+               testHelpers: { createDirectLineEmulator },
+               WebChat: {
+                  middleware: { createSendBoxPolymiddleware, sendBoxComponent }
+               }
+            } = window;
+
+            const { directLine, store } = createDirectLineEmulator();
+
+            const CustomSendBox = ({ className }) => createElement('div', { className, style: { border: 'solid 2px purple', padding: '10px' } }, 'Custom SendBox');
+
+            const polymiddleware = [
+               createSendBoxPolymiddleware(next => () => {
+                  // Replace with custom component
+                  return sendBoxComponent(CustomSendBox);
+               })
+            ];
+
+            WebChat.renderWebChat(
+               {
+                  directLine,
+                  polymiddleware,
+                  store
+               },
+               document.getElementById('webchat')
+            );
+
+            await pageConditions.uiConnected();
+
+            await host.snapshot('local');
+         });
+      </script>
+   </body>
+</html>
diff --git a/__tests__/html2/middleware/sendBox/polymiddleware/decorate.html b/__tests__/html2/middleware/sendBox/polymiddleware/decorate.html
new file mode 100644
index 0000000000..61fefd4b37
--- /dev/null
+++ b/__tests__/html2/middleware/sendBox/polymiddleware/decorate.html
@@ -0,0 +1,59 @@
+<!doctype html>
+<html lang="en-US">
+   <head>
+      <link href="/assets/index.css" rel="stylesheet" type="text/css" />
+      <script type="importmap">
+         {
+            "imports": {
+               "react": "https://esm.sh/react@18.3.1"
+            }
+         }
+      </script>
+      <script crossorigin="anonymous" src="/test-harness.js"></script>
+      <script crossorigin="anonymous" src="/test-page-object.js"></script>
+      <script crossorigin="anonymous" src="/__dist__/webchat-es5.js"></script>
+   </head>
+
+   <body>
+      <main id="webchat"></main>
+      <script type="module">
+         import { createElement, memo } from 'react';
+
+         run(async function () {
+            const {
+               testHelpers: { createDirectLineEmulator },
+               WebChat: {
+                  middleware: { createSendBoxPolymiddleware, sendBoxComponent }
+               }
+            } = window;
+
+            const { directLine, store } = createDirectLineEmulator();
+
+            const DecoratedSendBox = memo(function DecoratedSendBox({ render }) {
+               return createElement('div', { style: { border: 'solid 2px red' } }, render({}));
+            });
+
+            const polymiddleware = [
+               createSendBoxPolymiddleware(next => () => {
+                  const result = next();
+
+                  return sendBoxComponent(DecoratedSendBox, { render: result.render });
+               })
+            ];
+
+            WebChat.renderWebChat(
+               {
+                  directLine,
+                  polymiddleware,
+                  store
+               },
+               document.getElementById('webchat')
+            );
+
+            await pageConditions.uiConnected();
+
+            await host.snapshot('local');
+         });
+      </script>
+   </body>
+</html>
diff --git a/__tests__/html2/middleware/sendBox/polymiddleware/remove.html b/__tests__/html2/middleware/sendBox/polymiddleware/remove.html
new file mode 100644
index 0000000000..519af8fee6
--- /dev/null
+++ b/__tests__/html2/middleware/sendBox/polymiddleware/remove.html
@@ -0,0 +1,54 @@
+<!doctype html>
+<html lang="en-US">
+   <head>
+      <link href="/assets/index.css" rel="stylesheet" type="text/css" />
+      <script type="importmap">
+         {
+            "imports": {
+               "react": "https://esm.sh/react@18.3.1"
+            }
+         }
+      </script>
+      <script crossorigin="anonymous" src="/test-harness.js"></script>
+      <script crossorigin="anonymous" src="/test-page-object.js"></script>
+      <script crossorigin="anonymous" src="/__dist__/webchat-es5.js"></script>
+   </head>
+
+   <body>
+      <main id="webchat"></main>
+      <script type="module">
+         import { createElement } from 'react';
+
+         run(async function () {
+            const {
+               testHelpers: { createDirectLineEmulator },
+               WebChat: {
+                  middleware: { createSendBoxPolymiddleware }
+               }
+            } = window;
+
+            const { directLine, store } = createDirectLineEmulator();
+
+            const polymiddleware = [
+               createSendBoxPolymiddleware(next => () => {
+                  // Don't call next, effectively removing the sendbox
+                  return undefined;
+               })
+            ];
+
+            WebChat.renderWebChat(
+               {
+                  directLine,
+                  polymiddleware,
+                  store
+               },
+               document.getElementById('webchat')
+            );
+
+            await pageConditions.uiConnected();
+
+            await host.snapshot('local');
+         });
+      </script>
+   </body>
+</html>

From e86cc4964a6055521a22074b72fdb728c6bfc707 Mon Sep 17 00:00:00 2001
From: "anthropic-code-agent[bot]" <242468646+Claude@users.noreply.github.com>
Date: Wed, 4 Mar 2026 10:15:16 +0000
Subject: [PATCH 07/12] Port sendBoxMiddleware to polymiddleware infrastructure

Co-authored-by: compulim <1622400+compulim@users.noreply.github.com>
---
 package-lock.json | 72 ++++++++++++++++-------------------------------
 1 file changed, 25 insertions(+), 47 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index d47ce3fe61..dbad523745 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -336,7 +336,6 @@
       "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.28.5.tgz",
       "integrity": "sha512-e7jT4DxYvIDLk1ZHmU/m/mB19rex9sv0c2ftBtjSBv+kVM/902eh0fINUzD7UwLLNR+jU585GxUJ8/EBfAM5fw==",
       "devOptional": true,
-      "peer": true,
       "dependencies": {
         "@babel/code-frame": "^7.27.1",
         "@babel/generator": "^7.28.5",
@@ -3304,7 +3303,6 @@
       "version": "29.7.0",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@jest/fake-timers": "^29.7.0",
         "@jest/types": "^29.6.3",
@@ -3342,7 +3340,6 @@
       "version": "29.7.0",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@jest/types": "^29.6.3",
         "@sinonjs/fake-timers": "^10.0.2",
@@ -3632,7 +3629,6 @@
       "version": "29.6.3",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@jest/schemas": "^29.6.3",
         "@types/istanbul-lib-coverage": "^2.0.0",
@@ -5231,7 +5227,6 @@
       "version": "16.14.68",
       "resolved": "https://registry.npmjs.org/@types/react/-/react-16.14.68.tgz",
       "integrity": "sha512-GEe60JEJg7wIvnUzXBX/A++ieyum98WXF/q2oFr1RVar8OK8JxU/uEYBXgv7jF87SoaDdxtAq3KUaJFlu02ziw==",
-      "peer": true,
       "dependencies": {
         "@types/prop-types": "*",
         "@types/scheduler": "^0.16",
@@ -5242,7 +5237,6 @@
       "version": "16.9.25",
       "resolved": "https://registry.npmjs.org/@types/react-dom/-/react-dom-16.9.25.tgz",
       "integrity": "sha512-ZK//eAPhwft9Ul2/Zj+6O11YR6L4JX0J2sVeBC9Ft7x7HFN7xk7yUV/zDxqV6rjvqgl6r8Dq7oQImxtyf/Mzcw==",
-      "peer": true,
       "peerDependencies": {
         "@types/react": "^16.0.0"
       }
@@ -5384,7 +5378,6 @@
       "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-8.50.0.tgz",
       "integrity": "sha512-6/cmF2piao+f6wSxUsJLZjck7OQsYyRtcOZS02k7XINSNlz93v6emM8WutDQSXnroG2xwYlEVHJI+cPA7CPM3Q==",
       "dev": true,
-      "peer": true,
       "dependencies": {
         "@typescript-eslint/scope-manager": "8.50.0",
         "@typescript-eslint/types": "8.50.0",
@@ -5815,7 +5808,6 @@
       "version": "8.15.0",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "bin": {
         "acorn": "bin/acorn"
       },
@@ -6210,7 +6202,6 @@
     "node_modules/asn1.js": {
       "version": "5.4.1",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "bn.js": "^4.0.0",
         "inherits": "^2.0.1",
@@ -6285,7 +6276,8 @@
     "node_modules/asynckit": {
       "version": "0.4.0",
       "dev": true,
-      "license": "MIT"
+      "license": "MIT",
+      "peer": true
     },
     "node_modules/available-typed-arrays": {
       "version": "1.0.7",
@@ -6314,6 +6306,7 @@
       "resolved": "https://registry.npmjs.org/axios/-/axios-1.13.2.tgz",
       "integrity": "sha512-VPk9ebNqPcy5lRGuSlKx752IlDatOjT9paPlm8A7yOuW2Fbvp4X3JznJtT4f0GzGLLiWE9W8onz51SqLYwzGaA==",
       "dev": true,
+      "peer": true,
       "dependencies": {
         "follow-redirects": "^1.15.6",
         "form-data": "^4.0.4",
@@ -6908,7 +6901,6 @@
           "url": "https://github.com/sponsors/ai"
         }
       ],
-      "peer": true,
       "dependencies": {
         "baseline-browser-mapping": "^2.9.0",
         "caniuse-lite": "^1.0.30001759",
@@ -6957,6 +6949,7 @@
       "version": "0.2.13",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": "*"
       }
@@ -7282,6 +7275,7 @@
           "url": "https://github.com/rxaviers/cldr-data-npm/blob/master/LICENSE"
         }
       ],
+      "peer": true,
       "dependencies": {
         "cldr-data-downloader": "1.1.0",
         "glob": "10.3.12"
@@ -7290,6 +7284,7 @@
     "node_modules/cldr-data-downloader": {
       "version": "1.1.0",
       "dev": true,
+      "peer": true,
       "dependencies": {
         "axios": "^1.7.2",
         "mkdirp": "^1.0.4",
@@ -7304,12 +7299,14 @@
     "node_modules/cldr-data-downloader/node_modules/abbrev": {
       "version": "1.1.1",
       "dev": true,
-      "license": "ISC"
+      "license": "ISC",
+      "peer": true
     },
     "node_modules/cldr-data-downloader/node_modules/nopt": {
       "version": "3.0.6",
       "dev": true,
       "license": "ISC",
+      "peer": true,
       "dependencies": {
         "abbrev": "1"
       },
@@ -7321,6 +7318,7 @@
       "version": "1.0.1",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=0.6.0",
         "teleport": ">=0.2.0"
@@ -7330,6 +7328,7 @@
       "version": "10.3.12",
       "dev": true,
       "license": "ISC",
+      "peer": true,
       "dependencies": {
         "foreground-child": "^3.1.0",
         "jackspeak": "^2.3.6",
@@ -7351,6 +7350,7 @@
       "version": "2.3.6",
       "dev": true,
       "license": "BlueOak-1.0.0",
+      "peer": true,
       "dependencies": {
         "@isaacs/cliui": "^8.0.2"
       },
@@ -7369,6 +7369,7 @@
       "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-9.0.5.tgz",
       "integrity": "sha512-G6T0ZX48xgozx7587koeX9Ys2NYy6Gmv//P89sEte9V9whIapMNF4idKxnW2QtCcLiTWlb/wfCabAtAFWhhBow==",
       "dev": true,
+      "peer": true,
       "dependencies": {
         "brace-expansion": "^2.0.1"
       },
@@ -7570,6 +7571,7 @@
       "version": "1.0.8",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "delayed-stream": "~1.0.0"
       },
@@ -7823,7 +7825,6 @@
       "resolved": "https://registry.npmjs.org/core-js-pure/-/core-js-pure-3.47.0.tgz",
       "integrity": "sha512-BcxeDbzUrRnXGYIVAGFtcGQVNpFcUhVjr6W7F8XktvQW2iJP9e66GP6xdKotCRFlrxBvNIBrhwKteRXqMV86Nw==",
       "hasInstallScript": true,
-      "peer": true,
       "funding": {
         "type": "opencollective",
         "url": "https://opencollective.com/core-js"
@@ -8189,6 +8190,7 @@
       "version": "1.0.0",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=0.4.0"
       }
@@ -8737,7 +8739,6 @@
       "integrity": "sha512-HyNQImnsOC7X9PMNaCIeAm4ISCQXs5a5YasTXVliKv4uuBo1dKrG0A+uQS8M5eXjVMnLg3WgXaKvprHlFJQffw==",
       "dev": true,
       "hasInstallScript": true,
-      "peer": true,
       "bin": {
         "esbuild": "bin/esbuild"
       },
@@ -8803,7 +8804,6 @@
       "integrity": "sha512-ypowyDxpVSYpkXr9WPv2PAZCtNip1Mv5KTW0SCurXv/9iOpcrH9PaqUElksqEB6pChqHGDRCFTyrZlGhnLNGiA==",
       "deprecated": "This version is no longer supported. Please see https://eslint.org/version-support for other options.",
       "dev": true,
-      "peer": true,
       "dependencies": {
         "@eslint-community/eslint-utils": "^4.2.0",
         "@eslint-community/regexpp": "^4.6.1",
@@ -8859,7 +8859,6 @@
       "resolved": "https://registry.npmjs.org/eslint-config-prettier/-/eslint-config-prettier-10.1.8.tgz",
       "integrity": "sha512-82GZUjRS0p/jganf6q1rEO25VSoHH0hKPCTrgillPjdI/3bgBhAE1QzHrHTizjpRvy6pGAvKjDJtk2pF9NDq8w==",
       "dev": true,
-      "peer": true,
       "bin": {
         "eslint-config-prettier": "bin/cli.js"
       },
@@ -9789,6 +9788,7 @@
       "version": "1.1.0",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "pend": "~1.2.0"
       }
@@ -9965,6 +9965,7 @@
       "version": "4.0.4",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "asynckit": "^0.4.0",
         "combined-stream": "^1.0.8",
@@ -10254,7 +10255,6 @@
       "version": "1.7.1",
       "resolved": "https://registry.npmjs.org/globalize/-/globalize-1.7.1.tgz",
       "integrity": "sha512-PFymRL0PtitFOlSniuwwwNfkooi3cLQJo9Uke1+j1DsGfUkkHkwneImqVtGcqKI0TuzhAlHt7hAcgK324902HA==",
-      "peer": true,
       "dependencies": {
         "cldrjs": "^0.5.4"
       }
@@ -10496,7 +10496,6 @@
       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/handler-chain/-/handler-chain-0.1.1.tgz",
       "integrity": "sha512-5eo8F9UTUiFCMtDUF1ipva1tvOCGE+vFr33aFHSISjTqXfGywCRV2aE6TzPkMhaw1pArOv3wv2Wz3Rh+AJJ8bA==",
-      "peer": true,
       "dependencies": {
         "handler-chain": "^0.1.1"
       }
@@ -10911,8 +10910,7 @@
       "version": "2019.1.0",
       "resolved": "https://registry.npmjs.org/iana-tz-data/-/iana-tz-data-2019.1.0.tgz",
       "integrity": "sha512-T7+26Skkyxqjp4mg20/O065j9J5qP39nWVQj/2ArxQ0gSPkL+T9lwerRmiOAzFRNsNXepX45QqchqTVENwNvig==",
-      "dev": true,
-      "peer": true
+      "dev": true
     },
     "node_modules/iconv-lite": {
       "version": "0.6.3",
@@ -11769,7 +11767,6 @@
       "version": "0.3.0",
       "resolved": "https://registry.npmjs.org/iter-fest/-/iter-fest-0.3.0.tgz",
       "integrity": "sha512-t76cnHCl9MEZRaUb0VBwTXP8dWjxbcTYm91VGWfQYjSMXKkjdOAIjUsaMYuLIy9jxk9fT55XIlb4Y/HACK/zlw==",
-      "peer": true,
       "dependencies": {
         "iter-fest": "^0.3.0"
       },
@@ -12744,7 +12741,6 @@
       "version": "29.7.0",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@jest/types": "^29.6.3",
         "@types/node": "*",
@@ -13126,7 +13122,6 @@
       "version": "29.7.0",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@jest/types": "^29.6.3",
         "@types/node": "*",
@@ -14925,7 +14920,6 @@
       "version": "1.17.0",
       "resolved": "https://registry.npmjs.org/microsoft-cognitiveservices-speech-sdk/-/microsoft-cognitiveservices-speech-sdk-1.17.0.tgz",
       "integrity": "sha512-RVUCpTeu1g+R4HB/PaLQmEfsdHzwEa6+2phgCiPA4lGIiR7ILEL7qZHHUWAG6W4zcjnWeiLnL7tVgMbyd5XGgA==",
-      "peer": true,
       "dependencies": {
         "agent-base": "^6.0.1",
         "asn1.js-rfc2560": "^5.0.1",
@@ -15128,6 +15122,7 @@
       "version": "1.0.4",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "bin": {
         "mkdirp": "bin/cmd.js"
       },
@@ -15306,7 +15301,6 @@
       "version": "8.0.2",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "growly": "^1.3.0",
         "is-wsl": "^2.2.0",
@@ -15841,7 +15835,8 @@
     "node_modules/pend": {
       "version": "1.2.0",
       "dev": true,
-      "license": "MIT"
+      "license": "MIT",
+      "peer": true
     },
     "node_modules/picocolors": {
       "version": "1.1.1",
@@ -15976,7 +15971,6 @@
         }
       ],
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "nanoid": "^3.3.7",
         "picocolors": "^1.1.0",
@@ -16098,7 +16092,6 @@
       "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.7.4.tgz",
       "integrity": "sha512-v6UNi1+3hSlVvv8fSaoUbggEM5VErKmmpGA7Pl3HF8V6uKY7rvClBOJlH6yNwQtfTueNkGVpOv/mtWL9L4bgRA==",
       "dev": true,
-      "peer": true,
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+      "license": "MIT",
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-      "peer": true
+      "integrity": "sha512-M9/ELqF6fy8FwmkpnF0S3YKOqMyoWJ4+CS5Efg2ct3oY9daQvd/Pc71FpGZsVsbl3Cpb+IIcjBDUnnyBdQbq4w=="
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@@ -17136,7 +17126,6 @@
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@@ -20492,6 +20473,7 @@
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+      "peer": true,
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@@ -21824,7 +21805,6 @@
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From ea11cf5a2f7a49a61e60a285ab687caa8f6aa001 Mon Sep 17 00:00:00 2001
From: "anthropic-code-agent[bot]" <242468646+Claude@users.noreply.github.com>
Date: Wed, 4 Mar 2026 12:46:46 +0000
Subject: [PATCH 08/12] Add middleware exports to bundle and split
 legacyToPolymiddleware test

- Export createSendBoxPolymiddleware and createSendBoxPolymiddlewareFromLegacy in packages/bundle/src/boot/actual/middleware.ts
- Split legacyToPolymiddleware.html into two separate tests:
  - legacyAddComponent.html: Tests component added via legacy middleware
  - polymiddleware/addComponent.html: Tests component added via polymiddleware
- Generate test snapshots for all middleware tests

Co-authored-by: compulim <1622400+compulim@users.noreply.github.com>
---
 ...lymiddleware-add-component-html-1-snap.png | Bin 0 -> 4932 bytes
 ...eware-legacy-add-component-html-1-snap.png | Bin 0 -> 4932 bytes
 .../add.html.snap-1.png                       | Bin 0 -> 4932 bytes
 .../change.html.snap-1.png                    | Bin 0 -> 4932 bytes
 .../decorate.html.snap-1.png                  | Bin 0 -> 4932 bytes
 ...iddleware.html => legacyAddComponent.html} |  13 ++---
 .../remove.html.snap-1.png                    | Bin 0 -> 4932 bytes
 .../polymiddleware/add.html.snap-1.png        | Bin 0 -> 4932 bytes
 .../sendBox/polymiddleware/addComponent.html  |  53 ++++++++++++++++++
 .../polymiddleware/change.html.snap-1.png     | Bin 0 -> 4932 bytes
 .../polymiddleware/decorate.html.snap-1.png   | Bin 0 -> 4932 bytes
 .../polymiddleware/remove.html.snap-1.png     | Bin 0 -> 4932 bytes
 .../polymiddleware/simple.html.snap-1.png     | Bin 0 -> 4932 bytes
 packages/bundle/src/boot/actual/middleware.ts |  15 +++++
 14 files changed, 73 insertions(+), 8 deletions(-)
 create mode 100644 __tests__/__image_snapshots__/html/add-component-html-html-2-middleware-send-box-polymiddleware-add-component-html-1-snap.png
 create mode 100644 __tests__/__image_snapshots__/html/legacy-add-component-html-html-2-middleware-send-box-legacy-send-box-middleware-legacy-add-component-html-1-snap.png
 create mode 100644 __tests__/html2/middleware/sendBox/legacySendBoxMiddleware/add.html.snap-1.png
 create mode 100644 __tests__/html2/middleware/sendBox/legacySendBoxMiddleware/change.html.snap-1.png
 create mode 100644 __tests__/html2/middleware/sendBox/legacySendBoxMiddleware/decorate.html.snap-1.png
 rename __tests__/html2/middleware/sendBox/legacySendBoxMiddleware/{legacyToPolymiddleware.html => legacyAddComponent.html} (77%)
 create mode 100644 __tests__/html2/middleware/sendBox/legacySendBoxMiddleware/remove.html.snap-1.png
 create mode 100644 __tests__/html2/middleware/sendBox/polymiddleware/add.html.snap-1.png
 create mode 100644 __tests__/html2/middleware/sendBox/polymiddleware/addComponent.html
 create mode 100644 __tests__/html2/middleware/sendBox/polymiddleware/change.html.snap-1.png
 create mode 100644 __tests__/html2/middleware/sendBox/polymiddleware/decorate.html.snap-1.png
 create mode 100644 __tests__/html2/middleware/sendBox/polymiddleware/remove.html.snap-1.png
 create mode 100644 __tests__/html2/middleware/sendBox/polymiddleware/simple.html.snap-1.png

diff --git a/__tests__/__image_snapshots__/html/add-component-html-html-2-middleware-send-box-polymiddleware-add-component-html-1-snap.png b/__tests__/__image_snapshots__/html/add-component-html-html-2-middleware-send-box-polymiddleware-add-component-html-1-snap.png
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diff --git a/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/decorate.html.snap-1.png b/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/decorate.html.snap-1.png
new file mode 100644
index 0000000000000000000000000000000000000000..c22dbf469d79cfa54284d147d28857a8ab0e5ed1
GIT binary patch
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diff --git a/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/legacyToPolymiddleware.html b/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/legacyAddComponent.html
similarity index 77%
rename from __tests__/html2/middleware/sendBox/legacySendBoxMiddleware/legacyToPolymiddleware.html
rename to __tests__/html2/middleware/sendBox/legacySendBoxMiddleware/legacyAddComponent.html
index 73067c47e6..10b2be7a2c 100644
--- a/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/legacyToPolymiddleware.html
+++ b/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/legacyAddComponent.html
@@ -23,26 +23,23 @@
             const {
                testHelpers: { createDirectLineEmulator },
                WebChat: {
-                  middleware: { createSendBoxPolymiddleware, createSendBoxPolymiddlewareFromLegacy, sendBoxComponent }
+                  middleware: { createSendBoxPolymiddlewareFromLegacy }
                }
             } = window;
 
             const { directLine, store } = createDirectLineEmulator();
 
-            const Downstream = () => createElement('div', {}, '<Downstream />');
-
-            const polymiddleware = [
+            const sendBoxPolymiddleware = [
                createSendBoxPolymiddlewareFromLegacy(() => next => request => {
                   const child = next(request);
                   return () => createElement('div', { style: { border: 'solid 2px blue' } }, child?.());
-               }),
-               createSendBoxPolymiddleware(next => request => sendBoxComponent(Downstream))
+               })
             ];
 
             WebChat.renderWebChat(
                {
                   directLine,
-                  polymiddleware,
+                  sendBoxPolymiddleware,
                   store
                },
                document.getElementById('webchat')
@@ -50,7 +47,7 @@
 
             await pageConditions.uiConnected();
 
-            await host.snapshot('local');
+            await host.snapshot('legacy-component');
          });
       </script>
    </body>
diff --git a/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/remove.html.snap-1.png b/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/remove.html.snap-1.png
new file mode 100644
index 0000000000000000000000000000000000000000..c22dbf469d79cfa54284d147d28857a8ab0e5ed1
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diff --git a/__tests__/html2/middleware/sendBox/polymiddleware/add.html.snap-1.png b/__tests__/html2/middleware/sendBox/polymiddleware/add.html.snap-1.png
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diff --git a/__tests__/html2/middleware/sendBox/polymiddleware/addComponent.html b/__tests__/html2/middleware/sendBox/polymiddleware/addComponent.html
new file mode 100644
index 0000000000..589d3b973f
--- /dev/null
+++ b/__tests__/html2/middleware/sendBox/polymiddleware/addComponent.html
@@ -0,0 +1,53 @@
+<!doctype html>
+<html lang="en-US">
+   <head>
+      <link href="/assets/index.css" rel="stylesheet" type="text/css" />
+      <script type="importmap">
+         {
+            "imports": {
+               "react": "https://esm.sh/react@18.3.1"
+            }
+         }
+      </script>
+      <script crossorigin="anonymous" src="/test-harness.js"></script>
+      <script crossorigin="anonymous" src="/test-page-object.js"></script>
+      <script crossorigin="anonymous" src="/__dist__/webchat-es5.js"></script>
+   </head>
+
+   <body>
+      <main id="webchat"></main>
+      <script type="module">
+         import { createElement } from 'react';
+
+         run(async function () {
+            const {
+               testHelpers: { createDirectLineEmulator },
+               WebChat: {
+                  middleware: { createSendBoxPolymiddleware, sendBoxComponent }
+               }
+            } = window;
+
+            const { directLine, store } = createDirectLineEmulator();
+
+            const Downstream = () => createElement('div', {}, '<Downstream />');
+
+            const sendBoxPolymiddleware = [
+               createSendBoxPolymiddleware(next => request => sendBoxComponent(Downstream))
+            ];
+
+            WebChat.renderWebChat(
+               {
+                  directLine,
+                  sendBoxPolymiddleware,
+                  store
+               },
+               document.getElementById('webchat')
+            );
+
+            await pageConditions.uiConnected();
+
+            await host.snapshot('poly-component');
+         });
+      </script>
+   </body>
+</html>
diff --git a/__tests__/html2/middleware/sendBox/polymiddleware/change.html.snap-1.png b/__tests__/html2/middleware/sendBox/polymiddleware/change.html.snap-1.png
new file mode 100644
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diff --git a/__tests__/html2/middleware/sendBox/polymiddleware/simple.html.snap-1.png b/__tests__/html2/middleware/sendBox/polymiddleware/simple.html.snap-1.png
new file mode 100644
index 0000000000000000000000000000000000000000..c22dbf469d79cfa54284d147d28857a8ab0e5ed1
GIT binary patch
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HcmV?d00001

diff --git a/packages/bundle/src/boot/actual/middleware.ts b/packages/bundle/src/boot/actual/middleware.ts
index 9641816786..feefface3c 100644
--- a/packages/bundle/src/boot/actual/middleware.ts
+++ b/packages/bundle/src/boot/actual/middleware.ts
@@ -27,4 +27,19 @@ export {
   type ErrorBoxPolymiddlewareRequest
 } from 'botframework-webchat-api/middleware';
 
+export {
+  createSendBoxPolymiddleware,
+  sendBoxComponent,
+  SendBoxPolymiddlewareProxy,
+  useBuildRenderSendBoxCallback,
+  type SendBoxPolymiddleware,
+  type SendBoxPolymiddlewareHandler,
+  type SendBoxPolymiddlewareHandlerResult,
+  type SendBoxPolymiddlewareProps,
+  type SendBoxPolymiddlewareProxyProps,
+  type SendBoxPolymiddlewareRenderer,
+  type SendBoxPolymiddlewareRequest
+} from 'botframework-webchat-api/middleware';
+
 export { createActivityPolymiddlewareFromLegacy } from 'botframework-webchat-api/middleware';
+export { createSendBoxPolymiddlewareFromLegacy } from 'botframework-webchat-api/middleware';

From 5b7df5499fc166c7b450a1789ff6e7be6a1664ac Mon Sep 17 00:00:00 2001
From: "anthropic-code-agent[bot]" <242468646+Claude@users.noreply.github.com>
Date: Wed, 4 Mar 2026 13:03:48 +0000
Subject: [PATCH 09/12] Fix sendBox polymiddleware signature and update
 snapshot names

Co-authored-by: compulim <1622400+compulim@users.noreply.github.com>
---
 .../legacyAddComponent.html                      |   2 +-
 .../legacyAddComponent.html.snap-1.png           | Bin 0 -> 4932 bytes
 .../sendBox/polymiddleware/addComponent.html     |   4 ++--
 .../polymiddleware/addComponent.html.snap-1.png  | Bin 0 -> 4932 bytes
 4 files changed, 3 insertions(+), 3 deletions(-)
 create mode 100644 __tests__/html2/middleware/sendBox/legacySendBoxMiddleware/legacyAddComponent.html.snap-1.png
 create mode 100644 __tests__/html2/middleware/sendBox/polymiddleware/addComponent.html.snap-1.png

diff --git a/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/legacyAddComponent.html b/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/legacyAddComponent.html
index 10b2be7a2c..1c368260f7 100644
--- a/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/legacyAddComponent.html
+++ b/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/legacyAddComponent.html
@@ -47,7 +47,7 @@
 
             await pageConditions.uiConnected();
 
-            await host.snapshot('legacy-component');
+            await host.snapshot('local');
          });
       </script>
    </body>
diff --git a/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/legacyAddComponent.html.snap-1.png b/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/legacyAddComponent.html.snap-1.png
new file mode 100644
index 0000000000000000000000000000000000000000..c22dbf469d79cfa54284d147d28857a8ab0e5ed1
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/__tests__/html2/middleware/sendBox/polymiddleware/addComponent.html b/__tests__/html2/middleware/sendBox/polymiddleware/addComponent.html
index 589d3b973f..fedaa568c2 100644
--- a/__tests__/html2/middleware/sendBox/polymiddleware/addComponent.html
+++ b/__tests__/html2/middleware/sendBox/polymiddleware/addComponent.html
@@ -32,7 +32,7 @@
             const Downstream = () => createElement('div', {}, '<Downstream />');
 
             const sendBoxPolymiddleware = [
-               createSendBoxPolymiddleware(next => request => sendBoxComponent(Downstream))
+               createSendBoxPolymiddleware(next => () => sendBoxComponent(Downstream))
             ];
 
             WebChat.renderWebChat(
@@ -46,7 +46,7 @@
 
             await pageConditions.uiConnected();
 
-            await host.snapshot('poly-component');
+            await host.snapshot('local');
          });
       </script>
    </body>
diff --git a/__tests__/html2/middleware/sendBox/polymiddleware/addComponent.html.snap-1.png b/__tests__/html2/middleware/sendBox/polymiddleware/addComponent.html.snap-1.png
new file mode 100644
index 0000000000000000000000000000000000000000..c22dbf469d79cfa54284d147d28857a8ab0e5ed1
GIT binary patch
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From 9e41704b2ff22609d051269367828628cf929577 Mon Sep 17 00:00:00 2001
From: "anthropic-code-agent[bot]" <242468646+Claude@users.noreply.github.com>
Date: Wed, 4 Mar 2026 18:35:35 +0000
Subject: [PATCH 10/12] Addressing PR comments

Co-authored-by: compulim <1622400+compulim@users.noreply.github.com>
---
 packages/api/src/hooks/Composer.tsx | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/packages/api/src/hooks/Composer.tsx b/packages/api/src/hooks/Composer.tsx
index 3b1794d86b..f54dfb8aa0 100644
--- a/packages/api/src/hooks/Composer.tsx
+++ b/packages/api/src/hooks/Composer.tsx
@@ -50,6 +50,7 @@ import errorBoxTelemetryPolymiddleware from '../errorBox/errorBoxTelemetryPolymi
 import PrecompiledGlobalize from '../external/PrecompiledGlobalize';
 import usePonyfill from '../hooks/usePonyfill';
 import createActivityPolymiddlewareFromLegacy from '../legacy/createActivityPolymiddlewareFromLegacy';
+import createSendBoxPolymiddlewareFromLegacy from '../legacy/createSendBoxPolymiddlewareFromLegacy';
 import getAllLocalizedStrings from '../localization/getAllLocalizedStrings';
 import { SendBoxMiddlewareProvider, type SendBoxMiddleware } from '../middleware/SendBoxMiddleware';
 import {
@@ -524,6 +525,11 @@ const ComposerCore = ({
     [activityMiddleware]
   );
 
+  const polymiddlewareForLegacySendBoxMiddleware = useMemo<readonly Polymiddleware[]>(
+    () => Object.freeze([createSendBoxPolymiddlewareFromLegacy(...singleToArray(sendBoxMiddleware))]),
+    [sendBoxMiddleware]
+  );
+
   const polymiddleware = useMemo<readonly Polymiddleware[]>(
     () =>
       Object.freeze([
@@ -532,9 +538,10 @@ const ComposerCore = ({
         errorBoxTelemetryPolymiddleware,
         ...(polymiddlewareFromProps || []),
         ...polymiddlewareForLegacyActivityMiddleware,
+        ...polymiddlewareForLegacySendBoxMiddleware,
         activityFallbackPolymiddleware
       ]),
-    [polymiddlewareForLegacyActivityMiddleware, polymiddlewareFromProps]
+    [polymiddlewareForLegacyActivityMiddleware, polymiddlewareForLegacySendBoxMiddleware, polymiddlewareFromProps]
   );
 
   /**

From 14ded14b675f44b973854a97c3fb14195068ea7d Mon Sep 17 00:00:00 2001
From: "anthropic-code-agent[bot]" <242468646+Claude@users.noreply.github.com>
Date: Wed, 4 Mar 2026 22:16:54 +0000
Subject: [PATCH 11/12] Wire up sendBox polymiddleware to replace template
 middleware

Co-authored-by: compulim <1622400+compulim@users.noreply.github.com>
---
 .../src/sendBoxPolymiddleware.tsx             |  8 ++---
 packages/api/src/hooks/Composer.tsx           | 29 ++++++++++---------
 packages/component/src/BasicWebChat.tsx       |  5 ++--
 3 files changed, 22 insertions(+), 20 deletions(-)

diff --git a/packages/api-middleware/src/sendBoxPolymiddleware.tsx b/packages/api-middleware/src/sendBoxPolymiddleware.tsx
index cdc2a9203d..53345ab18c 100644
--- a/packages/api-middleware/src/sendBoxPolymiddleware.tsx
+++ b/packages/api-middleware/src/sendBoxPolymiddleware.tsx
@@ -1,6 +1,6 @@
 import { validateProps } from '@msinternal/botframework-webchat-react-valibot';
 import React, { memo, useMemo } from 'react';
-import { object, pipe, readonly, type InferInput } from 'valibot';
+import { object, optional, pipe, readonly, string, type InferInput } from 'valibot';
 
 import createErrorBoundaryMiddleware from './private/createErrorBoundaryMiddleware';
 import templatePolymiddleware, {
@@ -30,7 +30,7 @@ type SendBoxPolymiddlewareRenderer = InferRenderer<typeof Provider>;
 type SendBoxPolymiddlewareRequest = InferRequest<typeof Provider>;
 type SendBoxPolymiddlewareProviderProps = InferProviderProps<typeof Provider>;
 
-const sendBoxPolymiddlewareProxyPropsSchema = pipe(object({}), readonly());
+const sendBoxPolymiddlewareProxyPropsSchema = pipe(object({ className: optional(string()) }), readonly());
 
 type SendBoxPolymiddlewareProxyProps = Readonly<InferInput<typeof sendBoxPolymiddlewareProxyPropsSchema>>;
 
@@ -38,11 +38,11 @@ type SendBoxPolymiddlewareProxyProps = Readonly<InferInput<typeof sendBoxPolymid
 const SendBoxPolymiddlewareProxy = memo(function SendBoxPolymiddlewareProxy(
   props: SendBoxPolymiddlewareProxyProps
 ) {
-  validateProps(sendBoxPolymiddlewareProxyPropsSchema, props);
+  const { className } = validateProps(sendBoxPolymiddlewareProxyPropsSchema, props);
 
   const request = useMemo(() => undefined, []);
 
-  return <Proxy request={request} />;
+  return <Proxy className={className} request={request} />;
 });
 
 const SendBoxPolymiddlewareProvider = memo(function SendBoxPolymiddlewareProvider({
diff --git a/packages/api/src/hooks/Composer.tsx b/packages/api/src/hooks/Composer.tsx
index f54dfb8aa0..1976a9f74e 100644
--- a/packages/api/src/hooks/Composer.tsx
+++ b/packages/api/src/hooks/Composer.tsx
@@ -52,7 +52,7 @@ import usePonyfill from '../hooks/usePonyfill';
 import createActivityPolymiddlewareFromLegacy from '../legacy/createActivityPolymiddlewareFromLegacy';
 import createSendBoxPolymiddlewareFromLegacy from '../legacy/createSendBoxPolymiddlewareFromLegacy';
 import getAllLocalizedStrings from '../localization/getAllLocalizedStrings';
-import { SendBoxMiddlewareProvider, type SendBoxMiddleware } from '../middleware/SendBoxMiddleware';
+import { type SendBoxMiddleware } from '../middleware/SendBoxMiddleware';
 import {
   SendBoxToolbarMiddlewareProvider,
   type SendBoxToolbarMiddleware
@@ -526,7 +526,10 @@ const ComposerCore = ({
   );
 
   const polymiddlewareForLegacySendBoxMiddleware = useMemo<readonly Polymiddleware[]>(
-    () => Object.freeze([createSendBoxPolymiddlewareFromLegacy(...singleToArray(sendBoxMiddleware))]),
+    () => {
+      const middleware = singleToArray(sendBoxMiddleware) as any[];
+      return Object.freeze([createSendBoxPolymiddlewareFromLegacy(...middleware)]);
+    },
     [sendBoxMiddleware]
   );
 
@@ -622,18 +625,16 @@ const ComposerCore = ({
         <ActivityListenerComposer>
           <ActivitySendStatusComposer>
             <ActivityTypingComposer>
-              <SendBoxMiddlewareProvider middleware={sendBoxMiddleware || EMPTY_ARRAY}>
-                <SendBoxToolbarMiddlewareProvider middleware={sendBoxToolbarMiddleware || EMPTY_ARRAY}>
-                  <GroupActivitiesComposer groupActivitiesMiddleware={singleToArray(groupActivitiesMiddleware)}>
-                    <PolymiddlewareComposer polymiddleware={polymiddleware}>
-                      <SpeechToSpeechComposer>
-                        {typeof children === 'function' ? children(context) : children}
-                      </SpeechToSpeechComposer>
-                    </PolymiddlewareComposer>
-                  </GroupActivitiesComposer>
-                  <ActivitySendStatusTelemetryComposer />
-                </SendBoxToolbarMiddlewareProvider>
-              </SendBoxMiddlewareProvider>
+              <SendBoxToolbarMiddlewareProvider middleware={sendBoxToolbarMiddleware || EMPTY_ARRAY}>
+                <GroupActivitiesComposer groupActivitiesMiddleware={singleToArray(groupActivitiesMiddleware)}>
+                  <PolymiddlewareComposer polymiddleware={polymiddleware}>
+                    <SpeechToSpeechComposer>
+                      {typeof children === 'function' ? children(context) : children}
+                    </SpeechToSpeechComposer>
+                  </PolymiddlewareComposer>
+                </GroupActivitiesComposer>
+                <ActivitySendStatusTelemetryComposer />
+              </SendBoxToolbarMiddlewareProvider>
             </ActivityTypingComposer>
           </ActivitySendStatusComposer>
         </ActivityListenerComposer>
diff --git a/packages/component/src/BasicWebChat.tsx b/packages/component/src/BasicWebChat.tsx
index f910c43d18..0e72d97dbe 100644
--- a/packages/component/src/BasicWebChat.tsx
+++ b/packages/component/src/BasicWebChat.tsx
@@ -2,7 +2,8 @@
 /* eslint react/no-unsafe: off */
 
 import { validateProps } from '@msinternal/botframework-webchat-react-valibot';
-import { SendBoxMiddlewareProxy, hooks } from 'botframework-webchat-api';
+import { hooks } from 'botframework-webchat-api';
+import { SendBoxPolymiddlewareProxy } from 'botframework-webchat-api/middleware';
 import classNames from 'classnames';
 import React, { memo, useRef } from 'react';
 import { object, optional, pipe, readonly, string, type InferInput } from 'valibot';
@@ -72,7 +73,7 @@ function BasicWebChat(props: BasicWebChatProps) {
       {!options.hideToaster && <BasicToaster className={toasterClassName} />}
       <BasicTranscript className={transcriptClassName} />
       <BasicConnectivityStatus className={connectivityStatusClassName} />
-      <SendBoxMiddlewareProxy className={sendBoxClassName} request={undefined} />
+      <SendBoxPolymiddlewareProxy className={sendBoxClassName} />
     </AccessKeySinkSurface>
   );
 }

From 19dd8c8392fb2ab85a5a13246fd63cf1d9c7c3e8 Mon Sep 17 00:00:00 2001
From: "anthropic-code-agent[bot]" <242468646+Claude@users.noreply.github.com>
Date: Wed, 4 Mar 2026 23:24:19 +0000
Subject: [PATCH 12/12] Fix sendBox polymiddleware tests and formatting

- Fixed simple.html: Changed middleware signature from `request => next(request)` to `() => next()`
- Fixed addComponent.html: Renamed prop from `sendBoxPolymiddleware` to `polymiddleware`
- Fixed decorate.html: Added missing `className` prop to DecoratedSendBox component
- Fixed prettier/eslint formatting issues in api-middleware and api packages
- Regenerated all 11 snapshots for sendBox middleware tests
- All 11 sendBox middleware tests now pass

Co-authored-by: compulim <1622400+compulim@users.noreply.github.com>
---
 .../add.html.snap-1.png                       | Bin 4932 -> 1941 bytes
 .../change.html.snap-1.png                    | Bin 4932 -> 1941 bytes
 .../decorate.html.snap-1.png                  | Bin 4932 -> 1941 bytes
 .../legacyAddComponent.html.snap-1.png        | Bin 4932 -> 1941 bytes
 .../remove.html.snap-1.png                    | Bin 4932 -> 1941 bytes
 .../polymiddleware/add.html.snap-1.png        | Bin 4932 -> 4134 bytes
 .../sendBox/polymiddleware/addComponent.html  |   4 ++--
 .../addComponent.html.snap-1.png              | Bin 4932 -> 3809 bytes
 .../polymiddleware/change.html.snap-1.png     | Bin 4932 -> 4030 bytes
 .../sendBox/polymiddleware/decorate.html      |   4 ++--
 .../polymiddleware/decorate.html.snap-1.png   | Bin 4932 -> 2023 bytes
 .../polymiddleware/remove.html.snap-1.png     | Bin 4932 -> 1941 bytes
 .../sendBox/polymiddleware/simple.html        |   6 +++---
 .../polymiddleware/simple.html.snap-1.png     | Bin 4932 -> 2023 bytes
 .../src/sendBoxPolymiddleware.tsx             |   4 +---
 packages/api/src/hooks/Composer.tsx           |  11 ++++-------
 .../api/src/legacy/LegacySendBoxBridge.tsx    |   5 ++++-
 .../createSendBoxPolymiddlewareFromLegacy.tsx |  13 ++++++++++++-
 18 files changed, 28 insertions(+), 19 deletions(-)

diff --git a/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/add.html.snap-1.png b/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/add.html.snap-1.png
index c22dbf469d79cfa54284d147d28857a8ab0e5ed1..3c10d7b821cd22db9e6e79b11212aa23a2e93c6e 100644
GIT binary patch
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diff --git a/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/legacyAddComponent.html.snap-1.png b/__tests__/html2/middleware/sendBox/legacySendBoxMiddleware/legacyAddComponent.html.snap-1.png
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diff --git a/__tests__/html2/middleware/sendBox/polymiddleware/add.html.snap-1.png b/__tests__/html2/middleware/sendBox/polymiddleware/add.html.snap-1.png
index c22dbf469d79cfa54284d147d28857a8ab0e5ed1..26314f308515eaa9840097ed03d5f7dce70cee12 100644
GIT binary patch
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diff --git a/__tests__/html2/middleware/sendBox/polymiddleware/addComponent.html b/__tests__/html2/middleware/sendBox/polymiddleware/addComponent.html
index fedaa568c2..df4a674a7c 100644
--- a/__tests__/html2/middleware/sendBox/polymiddleware/addComponent.html
+++ b/__tests__/html2/middleware/sendBox/polymiddleware/addComponent.html
@@ -31,14 +31,14 @@
 
             const Downstream = () => createElement('div', {}, '<Downstream />');
 
-            const sendBoxPolymiddleware = [
+            const polymiddleware = [
                createSendBoxPolymiddleware(next => () => sendBoxComponent(Downstream))
             ];
 
             WebChat.renderWebChat(
                {
                   directLine,
-                  sendBoxPolymiddleware,
+                  polymiddleware,
                   store
                },
                document.getElementById('webchat')
diff --git a/__tests__/html2/middleware/sendBox/polymiddleware/addComponent.html.snap-1.png b/__tests__/html2/middleware/sendBox/polymiddleware/addComponent.html.snap-1.png
index c22dbf469d79cfa54284d147d28857a8ab0e5ed1..f3a2db73a6b559e978f29bb3a825956e1831a1c2 100644
GIT binary patch
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diff --git a/__tests__/html2/middleware/sendBox/polymiddleware/change.html.snap-1.png b/__tests__/html2/middleware/sendBox/polymiddleware/change.html.snap-1.png
index c22dbf469d79cfa54284d147d28857a8ab0e5ed1..d4b726c9a823668f0c3a0d19a950d288baa22667 100644
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diff --git a/__tests__/html2/middleware/sendBox/polymiddleware/decorate.html b/__tests__/html2/middleware/sendBox/polymiddleware/decorate.html
index 61fefd4b37..2e45df6503 100644
--- a/__tests__/html2/middleware/sendBox/polymiddleware/decorate.html
+++ b/__tests__/html2/middleware/sendBox/polymiddleware/decorate.html
@@ -29,8 +29,8 @@
 
             const { directLine, store } = createDirectLineEmulator();
 
-            const DecoratedSendBox = memo(function DecoratedSendBox({ render }) {
-               return createElement('div', { style: { border: 'solid 2px red' } }, render({}));
+            const DecoratedSendBox = memo(function DecoratedSendBox({ className, render }) {
+               return createElement('div', { className, style: { border: 'solid 2px red' } }, render({}));
             });
 
             const polymiddleware = [
diff --git a/__tests__/html2/middleware/sendBox/polymiddleware/decorate.html.snap-1.png b/__tests__/html2/middleware/sendBox/polymiddleware/decorate.html.snap-1.png
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diff --git a/__tests__/html2/middleware/sendBox/polymiddleware/remove.html.snap-1.png b/__tests__/html2/middleware/sendBox/polymiddleware/remove.html.snap-1.png
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diff --git a/__tests__/html2/middleware/sendBox/polymiddleware/simple.html b/__tests__/html2/middleware/sendBox/polymiddleware/simple.html
index e37a485c5a..f2cfdd2f13 100644
--- a/__tests__/html2/middleware/sendBox/polymiddleware/simple.html
+++ b/__tests__/html2/middleware/sendBox/polymiddleware/simple.html
@@ -34,9 +34,9 @@
             });
 
             const polymiddleware = [
-               createSendBoxPolymiddleware(next => request => next(request)),
-               createSendBoxPolymiddleware(next => request => {
-                  const result = next(request);
+               createSendBoxPolymiddleware(next => () => next()),
+               createSendBoxPolymiddleware(next => () => {
+                  const result = next();
 
                   return sendBoxComponent(MySendBox, { render: result.render });
                })
diff --git a/__tests__/html2/middleware/sendBox/polymiddleware/simple.html.snap-1.png b/__tests__/html2/middleware/sendBox/polymiddleware/simple.html.snap-1.png
index c22dbf469d79cfa54284d147d28857a8ab0e5ed1..d61084c39ceab6d97101e5141a225fdc5285fcfe 100644
GIT binary patch
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pj0_C_|L>icqXMk1*+BI)Ged73?=Sfus&j!N44$rjF6*2UngFCK{v!YY

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diff --git a/packages/api-middleware/src/sendBoxPolymiddleware.tsx b/packages/api-middleware/src/sendBoxPolymiddleware.tsx
index 53345ab18c..4d19a77c1a 100644
--- a/packages/api-middleware/src/sendBoxPolymiddleware.tsx
+++ b/packages/api-middleware/src/sendBoxPolymiddleware.tsx
@@ -35,9 +35,7 @@ const sendBoxPolymiddlewareProxyPropsSchema = pipe(object({ className: optional(
 type SendBoxPolymiddlewareProxyProps = Readonly<InferInput<typeof sendBoxPolymiddlewareProxyPropsSchema>>;
 
 // A friendlier version than the organic <Proxy>.
-const SendBoxPolymiddlewareProxy = memo(function SendBoxPolymiddlewareProxy(
-  props: SendBoxPolymiddlewareProxyProps
-) {
+const SendBoxPolymiddlewareProxy = memo(function SendBoxPolymiddlewareProxy(props: SendBoxPolymiddlewareProxyProps) {
   const { className } = validateProps(sendBoxPolymiddlewareProxyPropsSchema, props);
 
   const request = useMemo(() => undefined, []);
diff --git a/packages/api/src/hooks/Composer.tsx b/packages/api/src/hooks/Composer.tsx
index 1976a9f74e..a01c02fb21 100644
--- a/packages/api/src/hooks/Composer.tsx
+++ b/packages/api/src/hooks/Composer.tsx
@@ -525,13 +525,10 @@ const ComposerCore = ({
     [activityMiddleware]
   );
 
-  const polymiddlewareForLegacySendBoxMiddleware = useMemo<readonly Polymiddleware[]>(
-    () => {
-      const middleware = singleToArray(sendBoxMiddleware) as any[];
-      return Object.freeze([createSendBoxPolymiddlewareFromLegacy(...middleware)]);
-    },
-    [sendBoxMiddleware]
-  );
+  const polymiddlewareForLegacySendBoxMiddleware = useMemo<readonly Polymiddleware[]>(() => {
+    const middleware = singleToArray(sendBoxMiddleware) as any[];
+    return Object.freeze([createSendBoxPolymiddlewareFromLegacy(...middleware)]);
+  }, [sendBoxMiddleware]);
 
   const polymiddleware = useMemo<readonly Polymiddleware[]>(
     () =>
diff --git a/packages/api/src/legacy/LegacySendBoxBridge.tsx b/packages/api/src/legacy/LegacySendBoxBridge.tsx
index 6276930f03..3df3dcee5d 100644
--- a/packages/api/src/legacy/LegacySendBoxBridge.tsx
+++ b/packages/api/src/legacy/LegacySendBoxBridge.tsx
@@ -1,7 +1,10 @@
 import { validateProps } from '@msinternal/botframework-webchat-react-valibot';
 import React, { Fragment, memo, useMemo } from 'react';
 
-import { legacySendBoxBridgeComponentPropsSchema, type LegacySendBoxBridgeComponentProps } from './createSendBoxPolymiddlewareFromLegacy';
+import {
+  legacySendBoxBridgeComponentPropsSchema,
+  type LegacySendBoxBridgeComponentProps
+} from './createSendBoxPolymiddlewareFromLegacy';
 
 /**
  * This component is solely for `createSendBoxPolymiddlewareFromLegacy`.
diff --git a/packages/api/src/legacy/createSendBoxPolymiddlewareFromLegacy.tsx b/packages/api/src/legacy/createSendBoxPolymiddlewareFromLegacy.tsx
index a3d6a4a7fd..0160fb236c 100644
--- a/packages/api/src/legacy/createSendBoxPolymiddlewareFromLegacy.tsx
+++ b/packages/api/src/legacy/createSendBoxPolymiddlewareFromLegacy.tsx
@@ -6,7 +6,18 @@ import {
 import { type LegacySendBoxMiddleware } from '@msinternal/botframework-webchat-api-middleware/legacy';
 import { composeEnhancer, type Enhancer } from 'handler-chain';
 import { type ReactNode } from 'react';
-import { custom, function_, never, object, optional, pipe, readonly, safeParse, string, type InferInput } from 'valibot';
+import {
+  custom,
+  function_,
+  never,
+  object,
+  optional,
+  pipe,
+  readonly,
+  safeParse,
+  string,
+  type InferInput
+} from 'valibot';
 
 import LegacySendBoxBridge from './LegacySendBoxBridge';