perf: don't emit issues via websocket for now (#59024)

Author: ForsakenHarmony

packages/next/src/build/swc/index.ts

@@ -573,7 +573,7 @@ interface BaseUpdate {
     path: string
   }
   diagnostics: unknown[]
-  issues: unknown[]
+  issues: Issue[]
 }
 
 interface IssuesUpdate extends BaseUpdate {

packages/next/src/server/dev/hot-reloader-turbopack.ts

@@ -313,6 +313,12 @@ export async function createHotReloaderTurbopack(
   }
 
   function sendTurbopackMessage(payload: TurbopackUpdate) {
+    // TODO(PACK-2049): For some reason we end up emitting hundreds of issues messages on bigger apps,
+    //   a lot of which are duplicates.
+    //   They are currently not handled on the client at all, so might as well not send them for now.
+    payload.diagnostics = []
+    payload.issues = []
+
     for (const client of clients) {
       clientStates.get(client)?.turbopackUpdates.push(payload)
     }