Export HUB_URL and add documentation

Co-authored-by: julien-c <[email protected]>

Author: Copilot

packages/hub/README.md

@@ -202,6 +202,18 @@ Remote resources and local files should be passed as `URL` whenever it's possibl
 
 Under the hood, `@huggingface/hub` uses a lazy blob implementation to load the file.
 
+## Constants
+
+The library exports the following constants that you can use in your application:
+
+- `HUB_URL`: The base URL for the Hugging Face Hub API (`https://huggingface.co`). This can be useful if you need to construct URLs or check against the default URL.
+
+```ts
+import { HUB_URL } from "@huggingface/hub";
+
+console.log(HUB_URL); // https://huggingface.co
+```
+
 ## Dependencies
 
 - `@huggingface/tasks` : Typings only

packages/hub/src/index.ts

@@ -18,6 +18,7 @@ export type {
 	SpaceStage,
 } from "./types/public";
 export { HubApiError, InvalidApiResponseFormatError } from "./error";
+export { HUB_URL } from "./consts";
 /**
  * Only exported for E2Es convenience
  */