Next Router Middleware Support (vercel/turborepo#3690)

This updates our Next.js router, passing the `edgeInfo` manifest generated from the `middleware.js` file (or any other configured page extension).

Fixes WEB-277
Fixes WEB-370

crates/next-core/js/src/entry/router.ts

@@ -1,13 +1,16 @@
 import type { Ipc } from "@vercel/turbopack-next/ipc/index";
 import type { IncomingMessage, ServerResponse } from "node:http";
 import { Buffer } from "node:buffer";
+import { join } from "node:path";
 import { createServer, makeRequest } from "@vercel/turbopack-next/ipc/server";
 import { makeResolver } from "next/dist/server/router.js";
 import loadConfig from "next/dist/server/config";
 import { PHASE_DEVELOPMENT_SERVER } from "next/dist/shared/lib/constants";
 
 import "next/dist/server/node-polyfill-fetch.js";
 
+import middlewareChunkGroup from "MIDDLEWARE_CHUNK_GROUP";
+
 type RouterRequest = {
   method: string;
   pathname: string;
@@ -71,7 +74,16 @@ async function getResolveRoute(
     true
   );
 
-  return await makeResolver(dir, nextConfig);
+  const edgeInfo = {
+    name: "edge",
+    paths: middlewareChunkGroup.map((chunk: string) =>
+      join(process.cwd(), chunk)
+    ),
+    wasm: [],
+    env: [],
+    assets: [],
+  };
+  return await makeResolver(dir, nextConfig, edgeInfo);
 }
 
 export default async function route(

crates/next-core/src/next_config.rs

@@ -549,7 +549,7 @@ pub async fn load_next_config(execution_context: ExecutionContextVc) -> Result<N
     import_map.insert_exact_alias("styled-jsx", ImportMapping::External(None).into());
     import_map.insert_wildcard_alias("styled-jsx/", ImportMapping::External(None).into());
 
-    let context = node_evaluate_asset_context(Some(import_map.cell()));
+    let context = node_evaluate_asset_context(Some(import_map.cell()), None);
     let find_config_result = find_context_file(project_root, next_configs());
     let config_asset = match &*find_config_result.await? {
         FindContextFileResult::Found(config_path, _) => Some(SourceAssetVc::new(*config_path)),

crates/next-core/src/next_edge/context.rs

@@ -16,13 +16,16 @@ use crate::{
 };
 
 #[turbo_tasks::function]
-pub fn get_edge_compile_time_info(server_addr: ServerAddrVc) -> CompileTimeInfoVc {
+pub fn get_edge_compile_time_info(
+    server_addr: ServerAddrVc,
+    intention: Value<EnvironmentIntention>,
+) -> CompileTimeInfoVc {
     CompileTimeInfo {
         environment: EnvironmentVc::new(
             Value::new(ExecutionEnvironment::EdgeWorker(
                 EdgeWorkerEnvironment { server_addr }.into(),
             )),
-            Value::new(EnvironmentIntention::Api),
+            intention,
         ),
     }
     .cell()

crates/next-core/src/next_import_map.rs

@@ -197,6 +197,7 @@ pub async fn get_next_server_import_map(
                 );
             }
         }
+        ServerContextType::Middleware => {}
     }
 
     Ok(import_map.cell())
@@ -329,6 +330,7 @@ pub async fn insert_next_server_special_aliases(
                 request_to_import_mapping(app_dir, "next/dist/compiled/react-dom/*"),
             );
         }
+        ServerContextType::Middleware => {}
     }
     Ok(())
 }

crates/next-core/src/next_server/context.rs

@@ -33,6 +33,7 @@ pub enum ServerContextType {
     PagesData { pages_dir: FileSystemPathVc },
     AppSSR { app_dir: FileSystemPathVc },
     AppRSC { app_dir: FileSystemPathVc },
+    Middleware,
 }
 
 #[turbo_tasks::function]
@@ -111,6 +112,24 @@ pub async fn get_server_resolve_options_context(
                 ..resolve_options_context
             }
         }
+        ServerContextType::Middleware => {
+            let resolve_options_context = ResolveOptionsContext {
+                enable_node_modules: true,
+                enable_node_externals: true,
+                module: true,
+                custom_conditions: vec!["development".to_string()],
+                ..Default::default()
+            };
+            ResolveOptionsContext {
+                enable_typescript: true,
+                enable_react: true,
+                rules: vec![(
+                    foreign_code_context_condition,
+                    resolve_options_context.clone().cell(),
+                )],
+                ..resolve_options_context
+            }
+        }
     }
     .cell())
 }
@@ -134,6 +153,7 @@ pub fn get_server_compile_time_info(
                 ServerContextType::AppRSC { .. } => {
                     Value::new(EnvironmentIntention::ServerRendering)
                 }
+                ServerContextType::Middleware => Value::new(EnvironmentIntention::Middleware),
             },
         ),
     }
@@ -215,6 +235,25 @@ pub async fn get_server_module_options_context(
                 ..module_options_context
             }
         }
+        ServerContextType::Middleware => {
+            let module_options_context = ModuleOptionsContext {
+                execution_context: Some(execution_context),
+                ..Default::default()
+            };
+            ModuleOptionsContext {
+                enable_jsx: true,
+                enable_styled_jsx: true,
+                enable_postcss_transform,
+                enable_webpack_loaders,
+                enable_typescript_transform: true,
+                rules: vec![(
+                    foreign_code_context_condition,
+                    module_options_context.clone().cell(),
+                )],
+                custom_rules,
+                ..module_options_context
+            }
+        }
     }
     .cell();
 

crates/next-core/src/next_server/transforms.rs

@@ -31,6 +31,7 @@ pub async fn get_next_server_transforms_rules(
         }
         ServerContextType::AppSSR { .. } => (false, None),
         ServerContextType::AppRSC { .. } => (true, None),
+        ServerContextType::Middleware { .. } => (false, None),
     };
 
     rules.push(get_next_dynamic_transform_rule(

crates/next-core/src/page_source.rs

@@ -14,7 +14,7 @@ use turbopack_core::{
     asset::{Asset, AssetVc},
     chunk::{dev::DevChunkingContextVc, ChunkingContextVc},
     context::{AssetContext, AssetContextVc},
-    environment::ServerAddrVc,
+    environment::{EnvironmentIntention, ServerAddrVc},
     reference_type::{EntryReferenceSubType, ReferenceType},
     source_asset::SourceAssetVc,
     virtual_asset::VirtualAssetVc,
@@ -136,7 +136,8 @@ pub async fn create_page_source(
     .cell()
     .into();
 
-    let edge_compile_time_info = get_edge_compile_time_info(server_addr);
+    let edge_compile_time_info =
+        get_edge_compile_time_info(server_addr, Value::new(EnvironmentIntention::Api));
 
     let edge_chunking_context = DevChunkingContextVc::builder(
         project_path,