feat(docsearch): track docsearch-react UA

Author: francoischalifour

src/useSearchClient.ts

@@ -11,7 +11,18 @@ export function useSearchClient(
 ): SearchClient {
   const searchClient = React.useMemo(() => {
     const client = algoliasearch(appId, apiKey);
-    client.addAlgoliaAgent(`docsearch (${version})`);
+    client.addAlgoliaAgent('docsearch', version);
+
+    // Since DocSearch.js relies on DocSearch React with an alias to Preact,
+    // we cannot add the `docsearch-react` user agent by default, otherwise
+    // it would also be sent on a DocSearch.js integration.
+    // We therefore only add the `docsearch-react` user agent if `docsearch.js`
+    // is not present.
+    if (
+      /docsearch.js \(.*\)/.test(client.transporter.userAgent.value) === false
+    ) {
+      client.addAlgoliaAgent('docsearch-react', version);
+    }
 
     return transformSearchClient(client);
   }, [appId, apiKey, transformSearchClient]);