chore(docs): Generated JS Client Reference (#5334)

Automated changes by [create-pull-request](https://github.com/peter-evans/create-pull-request) GitHub action

Co-authored-by: Shahed Nasser <27354907+shahednasser@users.noreply.github.com>

www/apps/docs/content/references/js-client/interfaces/internal-10.UnderlyingSourceStartCallback.md

@@ -0,0 +1,33 @@
+---
+displayed_sidebar: jsClientSidebar
+---
+
+# Interface: UnderlyingSourceStartCallback<R\>
+
+[internal](../modules/internal-10.md).UnderlyingSourceStartCallback
+
+## Type parameters
+
+| Name |
+| :------ |
+| `R` |
+
+## Callable
+
+### UnderlyingSourceStartCallback
+
+▸ **UnderlyingSourceStartCallback**(`controller`): `any`
+
+#### Parameters
+
+| Name | Type |
+| :------ | :------ |
+| `controller` | [`ReadableStreamController`](../modules/internal-10.md#readablestreamcontroller)<`R`\> |
+
+#### Returns
+
+`any`
+
+#### Defined in
+
+docs-util/node_modules/typescript/lib/lib.dom.d.ts:26898