Turbopack dev: Remove client to server websocket ping event (#74584)

## What?

Skips the websocket ping for Turbopack. Currently the ping is only used
by the webpack integration to keep track of "active" entrypoints that
are still being viewed. Entrypoints that are no longer viewed will be
disposed from the webpack compiler.

With Turbopack this mechanism is not used and it keeps the entrypoints
around. Removing the ping makes the websocket events easier to monitor
and read while debugging.


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Author: timneutkens

packages/next/src/client/components/react-dev-overlay/_experimental/internal/helpers/use-websocket.ts

@@ -96,6 +96,12 @@ export function useWebsocketPing(
   const { tree } = useContext(GlobalLayoutRouterContext)
 
   useEffect(() => {
+    // Never send pings when using Turbopack as it's not used.
+    // Pings were originally used to keep track of active routes in on-demand-entries with webpack.
+    if (process.env.TURBOPACK) {
+      return
+    }
+
     // Taken from on-demand-entries-client.js
     const interval = setInterval(() => {
       sendMessage(

packages/next/src/client/components/react-dev-overlay/internal/helpers/use-websocket.ts

@@ -96,6 +96,12 @@ export function useWebsocketPing(
   const { tree } = useContext(GlobalLayoutRouterContext)
 
   useEffect(() => {
+    // Never send pings when using Turbopack as it's not used.
+    // Pings were originally used to keep track of active routes in on-demand-entries with webpack.
+    if (process.env.TURBOPACK) {
+      return
+    }
+
     // Taken from on-demand-entries-client.js
     const interval = setInterval(() => {
       sendMessage(

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

@@ -727,9 +727,6 @@ export async function createHotReloaderTurbopack(
 
           // Next.js messages
           switch (parsedData.event) {
-            case 'ping':
-              // Ping doesn't need additional handling in Turbopack.
-              break
             case 'span-end': {
               hotReloaderSpan.manualTraceChild(
                 parsedData.spanName,