From 590fe985be8f8f38eccdd0090dc504b0394b6ace Mon Sep 17 00:00:00 2001
From: OJ Kwon <1210596+kwonoj@users.noreply.github.com>
Date: Tue, 27 Jun 2023 11:03:02 -0700
Subject: [PATCH] feat(next-dev): add a new experimental flag

---
 packages/next-swc/crates/napi/src/turbopack.rs | 5 +++++
 packages/next/src/build/swc/index.ts           | 9 +++++++++
 packages/next/src/cli/next-dev.ts              | 8 ++++++++
 packages/next/src/server/lib/start-server.ts   | 1 +
 4 files changed, 23 insertions(+)

diff --git a/packages/next-swc/crates/napi/src/turbopack.rs b/packages/next-swc/crates/napi/src/turbopack.rs
index 04e5c18c2e1e..56046e394b0e 100644
--- a/packages/next-swc/crates/napi/src/turbopack.rs
+++ b/packages/next-swc/crates/napi/src/turbopack.rs
@@ -181,3 +181,8 @@ impl From<NapiRouteHas> for RouteHas {
 pub async fn next_build(ctx: NextBuildContext) -> napi::Result<()> {
     turbo_next_build(ctx.try_into()?).await.convert_err()
 }
+
+#[napi]
+pub async fn experimental_turbo(_unused: Buffer) -> napi::Result<()> {
+    unimplemented!("__experimental_turbo is not yet implemented");
+}
diff --git a/packages/next/src/build/swc/index.ts b/packages/next/src/build/swc/index.ts
index e08dc42ea1a2..3b779c46ee1d 100644
--- a/packages/next/src/build/swc/index.ts
+++ b/packages/next/src/build/swc/index.ts
@@ -296,6 +296,9 @@ async function loadWasm(importPath = '', isCustomTurbopack: boolean) {
           startTrace: () => {
             Log.error('Wasm binding does not support trace yet')
           },
+          experimentalTurbo: () => {
+            Log.error('Wasm binding does not support this interface')
+          },
           entrypoints: {
             stream: (
               turboTasks: any,
@@ -555,6 +558,12 @@ function loadNative(isCustomTurbopack = false) {
           )
           return ret
         },
+        experimentalTurbo: () => {
+          initHeapProfiler()
+
+          const ret = bindings.experimentalTurbo()
+          return ret
+        },
         createTurboTasks: (memoryLimit?: number): unknown =>
           bindings.createTurboTasks(memoryLimit),
         entrypoints: {
diff --git a/packages/next/src/cli/next-dev.ts b/packages/next/src/cli/next-dev.ts
index c9f16183e27d..e019a0bf6767 100644
--- a/packages/next/src/cli/next-dev.ts
+++ b/packages/next/src/cli/next-dev.ts
@@ -119,6 +119,7 @@ const nextDev: CliCommand = async (argv) => {
     '--port': Number,
     '--hostname': String,
     '--turbo': Boolean,
+    '--experimental-turbo': Boolean,
 
     // To align current messages with native binary.
     // Will need to adjust subcommand later.
@@ -209,6 +210,7 @@ const nextDev: CliCommand = async (argv) => {
   // We do not set a default host value here to prevent breaking
   // some set-ups that rely on listening on other interfaces
   const host = args['--hostname']
+  const experimentalTurbo = args['--experimental-turbo']
 
   const devServerOptions: StartServerOptions = {
     dir,
@@ -218,6 +220,7 @@ const nextDev: CliCommand = async (argv) => {
     hostname: host,
     // This is required especially for app dir.
     useWorkers: true,
+    isExperimentalTurbo: experimentalTurbo,
   }
 
   if (args['--turbo']) {
@@ -311,6 +314,11 @@ const nextDev: CliCommand = async (argv) => {
 
     return server
   } else {
+    if (experimentalTurbo) {
+      Log.error('Not supported yet')
+      process.exit(1)
+    }
+
     let cleanupFns: (() => Promise<void> | void)[] = []
     const runDevServer = async () => {
       const oldCleanupFns = cleanupFns
diff --git a/packages/next/src/server/lib/start-server.ts b/packages/next/src/server/lib/start-server.ts
index 50fa905a53ad..e10a34e1fb64 100644
--- a/packages/next/src/server/lib/start-server.ts
+++ b/packages/next/src/server/lib/start-server.ts
@@ -22,6 +22,7 @@ export interface StartServerOptions {
   useWorkers: boolean
   allowRetry?: boolean
   isTurbopack?: boolean
+  isExperimentalTurbo?: boolean
   keepAliveTimeout?: number
   onStdout?: (data: any) => void
   onStderr?: (data: any) => void