From 1fea7288c35eeb36a7bf217bfaaad308ee6e5f2f Mon Sep 17 00:00:00 2001
From: neverland <chenjiahan.jait@bytedance.com>
Date: Wed, 1 Oct 2025 22:07:18 +0800
Subject: [PATCH 1/2] perf(hmr): no need to get assets info

---
 packages/core/src/server/socketServer.ts | 34 +++++++++++++-----------
 1 file changed, 19 insertions(+), 15 deletions(-)

diff --git a/packages/core/src/server/socketServer.ts b/packages/core/src/server/socketServer.ts
index 5ee641b3f5..3f79cac3a2 100644
--- a/packages/core/src/server/socketServer.ts
+++ b/packages/core/src/server/socketServer.ts
@@ -88,6 +88,8 @@ export class SocketServer {
 
   private reportedBrowserLogs: Set<string> = new Set();
 
+  private currentHash: Map<string, string> = new Map();
+
   constructor(
     context: InternalContext,
     options: DevConfig,
@@ -332,7 +334,7 @@ export class SocketServer {
       return null;
     }
 
-    const defaultStats: Record<string, boolean> = {
+    const defaultStats: Rspack.StatsOptions = {
       all: false,
       hash: true,
       assets: true,
@@ -383,7 +385,7 @@ export class SocketServer {
     const newInitialChunks: Set<string> = new Set();
     if (statsJson.entrypoints) {
       for (const entrypoint of Object.values(statsJson.entrypoints)) {
-        const chunks = entrypoint.chunks;
+        const { chunks } = entrypoint;
 
         if (!Array.isArray(chunks)) {
           continue;
@@ -411,19 +413,22 @@ export class SocketServer {
       return;
     }
 
-    const shouldEmit =
-      !force &&
-      statsJson &&
-      !statsJson.errorsCount &&
-      statsJson.assets &&
-      statsJson.assets.every((asset: any) => !asset.emitted);
-
-    if (shouldEmit) {
-      this.sockWrite({ type: 'ok' }, token);
-      return;
-    }
-
     if (statsJson.hash) {
+      const prevHash = this.currentHash.get(token);
+      this.currentHash.set(token, statsJson.hash);
+
+      // If build hash is not changed and there is no error or warning, skip emit
+      const shouldEmit =
+        !force &&
+        !statsJson.errorsCount &&
+        !statsJson.warningsCount &&
+        prevHash === statsJson.hash;
+
+      if (shouldEmit) {
+        this.sockWrite({ type: 'ok' }, token);
+        return;
+      }
+
       this.sockWrite(
         {
           type: 'hash',
@@ -469,7 +474,6 @@ export class SocketServer {
     }
 
     this.sockWrite({ type: 'ok' }, token);
-    return;
   }
 
   // send message to connecting socket

From f711885e6a3ee6028130d20cb6ed845c6f8d4590 Mon Sep 17 00:00:00 2001
From: neverland <chenjiahan.jait@bytedance.com>
Date: Thu, 2 Oct 2025 07:59:19 +0800
Subject: [PATCH 2/2] Apply suggestion from @Copilot

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
---
 packages/core/src/server/socketServer.ts | 1 -
 1 file changed, 1 deletion(-)

diff --git a/packages/core/src/server/socketServer.ts b/packages/core/src/server/socketServer.ts
index 3f79cac3a2..415413ab64 100644
--- a/packages/core/src/server/socketServer.ts
+++ b/packages/core/src/server/socketServer.ts
@@ -337,7 +337,6 @@ export class SocketServer {
     const defaultStats: Rspack.StatsOptions = {
       all: false,
       hash: true,
-      assets: true,
       warnings: true,
       warningsCount: true,
       errors: true,