Add

.eslintrc.json

@@ -0,0 +1,3 @@
+{
+  "extends": "next/core-web-vitals"
+}

.gitignore

@@ -0,0 +1,36 @@
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# next.js
+/.next/
+/out/
+
+# production
+/build
+
+# misc
+.DS_Store
+*.pem
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+.pnpm-debug.log*
+
+# local env files
+.env*.local
+
+# vercel
+.vercel
+
+# typescript
+*.tsbuildinfo
+next-env.d.ts

.yarnrc

@@ -0,0 +1 @@
+registry "https://registry.npmjs.org/"

README.md

@@ -0,0 +1,34 @@
+This is a [Next.js](https://nextjs.org/) project bootstrapped with [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app).
+
+## Getting Started
+
+First, run the development server:
+
+```bash
+npm run dev
+# or
+yarn dev
+```
+
+Open [http://localhost:3000](http://localhost:3000) with your browser to see the result.
+
+You can start editing the page by modifying `pages/index.js`. The page auto-updates as you edit the file.
+
+[API routes](https://nextjs.org/docs/api-routes/introduction) can be accessed on [http://localhost:3000/api/hello](http://localhost:3000/api/hello). This endpoint can be edited in `pages/api/hello.js`.
+
+The `pages/api` directory is mapped to `/api/*`. Files in this directory are treated as [API routes](https://nextjs.org/docs/api-routes/introduction) instead of React pages.
+
+## Learn More
+
+To learn more about Next.js, take a look at the following resources:
+
+- [Next.js Documentation](https://nextjs.org/docs) - learn about Next.js features and API.
+- [Learn Next.js](https://nextjs.org/learn) - an interactive Next.js tutorial.
+
+You can check out [the Next.js GitHub repository](https://github.com/vercel/next.js/) - your feedback and contributions are welcome!
+
+## Deploy on Vercel
+
+The easiest way to deploy your Next.js app is to use the [Vercel Platform](https://vercel.com/new?utm_medium=default-template&filter=next.js&utm_source=create-next-app&utm_campaign=create-next-app-readme) from the creators of Next.js.
+
+Check out our [Next.js deployment documentation](https://nextjs.org/docs/deployment) for more details.

app/(examples)/happy/[duration]/loading.js

@@ -0,0 +1,16 @@
+const Loading = () => {
+  return (
+    <div className="lds-roller">
+      <div></div>
+      <div></div>
+      <div></div>
+      <div></div>
+      <div></div>
+      <div></div>
+      <div></div>
+      <div></div>
+    </div>
+  );
+};
+
+export default Loading;

app/(examples)/happy/[duration]/page.server.js

@@ -0,0 +1,16 @@
+import durations from "../../../../util/durations";
+
+export const getServerSideProps = async (context) => {
+  const { duration } = context.params;
+
+  // artificial delay
+  await new Promise((resolve) => setTimeout(resolve, durations[duration]));
+
+  return {
+    props: { wait: durations[duration] },
+  };
+};
+
+export default function Page({ children, wait }) {
+  return <p> Waited {wait / 1000} seconds</p>;
+}

app/(examples)/happy/layout.server.js

@@ -0,0 +1,10 @@
+const HappyWithLoadingLayout = ({ children }) => {
+  return (
+    <>
+      <p>Happy Path With Loading</p>
+      <div style={{ textAlign: "center" }}>{children}</div>
+    </>
+  );
+};
+
+export default HappyWithLoadingLayout;

app/(examples)/happy/page.server.js

@@ -0,0 +1,5 @@
+const HappyPage = ({ children }) => {
+  return <p>Explore the Happy Path!</p>;
+};
+
+export default HappyPage;

app/(examples)/layout.server.js

@@ -0,0 +1,28 @@
+import SubNav from "../../components/sub-nav.client";
+
+const ExamplesLayout = ({ children }) => {
+  return (
+    <>
+      <div
+        style={{
+          display: "flex",
+          flexDirection: "column",
+          alignItems: "center",
+        }}
+      >
+        <SubNav />
+        <div
+          style={{
+            display: "flex",
+            flexDirection: "column",
+            alignItems: "center",
+          }}
+        >
+          {children}
+        </div>
+      </div>
+    </>
+  );
+};
+
+export default ExamplesLayout;

app/(examples)/sad/[duration]/loading.js

@@ -0,0 +1,5 @@
+const Loading = () => {
+  <> Loading</>;
+};
+
+export default Loading;

app/(examples)/sad/[duration]/page.server.js

@@ -0,0 +1,16 @@
+import durations from "../../../../util/durations";
+
+export const getServerSideProps = async (context) => {
+  const { duration } = context.params;
+
+  // artificial delay
+  await new Promise((resolve) => setTimeout(resolve, durations[duration]));
+
+  return {
+    props: { wait: durations[duration] },
+  };
+};
+
+export default function Page({ children, wait }) {
+  return <p> Waited {wait / 1000} seconds</p>;
+}

app/(examples)/sad/layout.server.js

@@ -0,0 +1,10 @@
+const SadLayout = ({ children }) => {
+  return (
+    <>
+      <p>Sad Path</p>
+      <div style={{ textAlign: "center" }}>{children}</div>
+    </>
+  );
+};
+
+export default SadLayout;

app/(examples)/sad/page.server.js

@@ -0,0 +1,5 @@
+const SadPage = ({ children }) => {
+  return <p>Explore the Sad Path!</p>;
+};
+
+export default SadPage;

app/layout.server.js

@@ -0,0 +1,22 @@
+import React from "react";
+import "../styles/globals.css";
+import TopNav from "../components/nav.client";
+
+export default function RootLayout({ children }) {
+  return (
+    <html>
+      <head>
+        <title>RSC Layout Streaming MVR</title>
+      </head>
+
+      <body>
+        <div>
+          <div>
+            <TopNav />
+          </div>
+          <div style={{ padding: "20px 100px" }}>{children}</div>
+        </div>
+      </body>
+    </html>
+  );
+}

app/page.server.js

@@ -0,0 +1,26 @@
+export default function Page() {
+  return (
+    <div style={{ padding: "20px" }}>
+      <h3>RSC / Layouts Loading Examples </h3>
+      <p> Description </p>
+      <p>
+        Each path has nested layouts which use artificial delays to simulate a
+        server component waiting for data fetch. Each path includes multiple
+        delay options for 1, 5 and 10 seconds.
+      </p>
+      <p>Happy Path</p>
+      <ul>
+        <li>loading.js used</li>
+        <li>Initial page load streams content</li>
+      </ul>
+      <p>Sad Path</p>
+      <ul>
+        <li>loading.js not used</li>
+        <li>
+          Initial page load waits for delay, does not stream rest of page first
+        </li>
+        <li>No client or server side logs indicating incorrect setup</li>
+      </ul>
+    </div>
+  );
+}

components/nav.client.js

@@ -0,0 +1,19 @@
+import Link from "next/link";
+
+const Nav = () => (
+  <>
+    <div style={{ display: "flex", justifyContent: "center" }}>
+      <div style={{ display: "flex", flexDirection: "column" }}>
+        <h2 style={{ textAlign: "center" }}>RSC Streaming Loading MVR</h2>
+
+        <div style={{ display: "flex", flexDirection: "row" }}>
+          <Link href="/">Home</Link>
+          <Link href="/happy">Happy Loading Path</Link>
+          <Link href="/sad">Sad Path</Link>
+        </div>
+      </div>
+    </div>
+  </>
+);
+
+export default Nav;

components/sub-nav.client.js

@@ -0,0 +1,34 @@
+import Link from "next/link";
+import durations from "../util/durations";
+import { useState } from "react";
+import { usePathname } from "next/dist/client/components/hooks-client";
+
+const SubNav = () => {
+  const [count, setCount] = useState(0);
+
+  const pathname = usePathname();
+
+  // this is trash but I'm too lazy to fix it
+  const basePath = pathname.includes("happy") ? "happy" : "sad";
+
+  return (
+    <>
+      <div style={{ display: "flex", flexDirection: "row" }}>
+        {Object.keys(durations).map((duration) => (
+          <Link
+            key={duration}
+            className="subnav"
+            href={`/${basePath}/${duration}`}
+          >
+            {duration}
+          </Link>
+        ))}
+        <button onClick={() => setCount((curCount) => curCount + 1)}>
+          Clicks: {count}
+        </button>
+      </div>
+    </>
+  );
+};
+
+export default SubNav;

next.config.js

@@ -0,0 +1,24 @@
+/** @type {import('next').NextConfig} */
+const nextConfig = {
+  reactStrictMode: true,
+  swcMinify: true,
+  experimental: {
+    // Required:
+    appDir: true,
+    serverComponents: true,
+    // Recommended for new `<Link>` and `<Image>` behavior
+    // Enables `<Link>` without `<a>`. When migrating an existing app use the codemod as outlined here: https://github.com/vercel/next.js/pull/36436
+    newNextLinkBehavior: true,
+    // Enables `next/future/image`
+    images: {
+      allowFutureImage: true,
+    },
+    // Recommended, will be the default in the next major version:
+    // Enable browserslist handling, which is required for legacyBrowsers: false
+    browsersListForSwc: true,
+    // Change the default compilation output to ESModules compatible browsers
+    legacyBrowsers: false,
+  },
+};
+
+module.exports = nextConfig;

package.json

@@ -0,0 +1,24 @@
+{
+  "name": "rsc-next-loading-mvr",
+  "version": "0.1.0",
+  "private": true,
+  "scripts": {
+    "dev": "next dev",
+    "build": "next build",
+    "start": "next start",
+    "lint": "next lint"
+  },
+  "dependencies": {
+    "@emotion/react": "^11.10.4",
+    "@emotion/styled": "^11.10.4",
+    "@fontsource/roboto": "^4.5.8",
+    "@mui/material": "^5.10.3",
+    "next": "^12.2.6-canary.8",
+    "react": "^0.0.0-experimental-9ff738f53-20220826",
+    "react-dom": "^0.0.0-experimental-9ff738f53-20220826"
+  },
+  "devDependencies": {
+    "eslint": "8.23.0",
+    "eslint-config-next": "12.2.5"
+  }
+}