Pass server context to Flight render (#38582)

Ensures you can use server context when navigating.


## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have helpful link attached, see `contributing.md`

## Documentation / Examples

- [ ] Make sure the linting passes by running `pnpm lint`
- [ ] The examples guidelines are followed from [our contributing doc](https://github.com/vercel/next.js/blob/canary/contributing.md#adding-examples)

.vscode/launch.json

@@ -10,7 +10,7 @@
       "request": "launch",
       "cwd": "${workspaceFolder}",
       "runtimeExecutable": "yarn",
-      "runtimeArgs": ["run", "debug", "dev", "test/e2e/app-dir/app"],
+      "runtimeArgs": ["run", "debug-react-exp", "dev", "test/e2e/app-dir/app"],
       "skipFiles": ["<node_internals>/**"],
       "outFiles": ["${workspaceFolder}/packages/next/dist/**/*"],
       "port": 9229,

package.json

@@ -43,6 +43,7 @@
     "next-no-sourcemaps": "node --trace-deprecation packages/next/dist/bin/next",
     "clean-trace-jaeger": "rm -rf test/integration/basic/.next && TRACE_TARGET=JAEGER node --trace-deprecation --enable-source-maps packages/next/dist/bin/next build test/integration/basic",
     "debug": "node --inspect packages/next/dist/bin/next",
+    "debug-react-exp": "__NEXT_REACT_CHANNEL=exp node --inspect --trace-deprecation --enable-source-maps -r ./test/lib/react-channel-require-hook.js packages/next/dist/bin/next",
     "postinstall": "git config feature.manyFiles true && node scripts/install-native.mjs",
     "version": "pnpm install && git add pnpm-lock.yaml",
     "prepare": "husky install"

packages/next/server/app-render.tsx

@@ -812,7 +812,9 @@ export async function renderToHTML(
     ]
 
     return new RenderResult(
-      renderToReadableStream(flightData, serverComponentManifest)
+      renderToReadableStream(flightData, serverComponentManifest, {
+        context: serverContexts,
+      })
         .pipeThrough(createPrefixStream(cssFlightData))
         .pipeThrough(createBufferedTransformStream())
     )