agentic-dev-template/apps/web-next/AGENTS.md

AGENTS.md — apps/web-next

Next.js 15 reference application using App Router. Demonstrates consuming feature packages via tRPC and importing UI components from @repo/core-ui. Both @repo/core-trpc and @repo/core-ui are optional packages — scaffold them with pnpm turbo gen core-package trpc / ui if needed.

Purpose

Thin app showcasing how features work end-to-end. Business logic lives in feature packages (@repo/auth, @repo/blog, etc.); UI primitives live in @repo/core-ui; this app is mostly routes, layouts, and component composition.

Port: 3000

pnpm dev --filter @repo/web-next   # http://localhost:3000

Requires @repo/cms and PostgreSQL running to fetch live data:

docker compose up -d postgres       # PostgreSQL on port 5432
pnpm dev --filter @repo/cms        # Payload admin on port 3001
pnpm dev --filter @repo/web-next   # Next.js on port 3000

Key Files

File	Purpose
src/app/layout.tsx	Root layout — wraps app with <Providers>
src/app/providers.tsx	Client component wrapper (add tRPC/React Query here after scaffolding @repo/core-trpc)
src/app/page.tsx	Home page — navigation + marketing content
src/app/blog/[slug]/page.tsx	Dynamic blog post route
e2e/	Playwright end-to-end tests

tRPC Setup (optional)

@repo/core-trpc is not installed by default. After scaffolding with pnpm turbo gen core-package trpc:

1. Create src/app/api/trpc/[trpc]/route.ts:

import { fetchRequestHandler } from "@trpc/server/adapters/fetch";
import { appRouter } from "@repo/core-api";
import { bindAll } from "../../../../server/bind-production";

const handler = async (req: Request) => {
  await bindAll();
  return fetchRequestHandler({
    endpoint: "/api/trpc",
    req,
    router: appRouter,
    createContext: () => ({}),
  });
};

export { handler as GET, handler as POST };

2. Update src/app/providers.tsx:

"use client";
import { NextTrpcProvider } from "@repo/core-trpc/next";

export function Providers({ children }: { children: React.ReactNode }) {
  return <NextTrpcProvider trpcUrl="/api/trpc">{children}</NextTrpcProvider>;
}

Dependencies

Dependency	Purpose
@repo/core-api	appRouter for tRPC endpoint
@repo/core-trpc/next	Next.js tRPC client + provider (optional — scaffold first)
@repo/core-ui	Design system components (optional — scaffold first)
@repo/auth, @repo/blog, etc.	Feature packages (indirectly via core-api)
next	Next.js 15 framework
@trpc/server	tRPC server (fetch adapter)

Test conventions

• Unit tests colocated: src/app/blog/article-list.test.tsx
• Vitest environment: jsdom
• e2e tests in e2e/ folder: *.spec.ts
• Run: pnpm test --filter @repo/web-next (units) or pnpm test:e2e (Playwright)

E2E Test Setup

Playwright config in e2e/playwright.config.ts:

import { defineConfig, devices } from "@playwright/test";

export default defineConfig({
  testDir: "./e2e",
  webServer: {
    command: "pnpm dev",
    port: 3000,
    reuseExistingServer: !process.env.CI,
  },
  use: { ...devices["Desktop Chrome"].use },
});

Run: pnpm test:e2e starts the dev server and runs all .spec.ts files.

Cross-References

• Feature packages: packages/{auth,blog,media,marketing-pages,navigation}/
• tRPC composition: packages/core-api/AGENTS.md
• tRPC client + provider (optional): scaffold @repo/core-trpc first, then see turbo/generators/templates/core-package/trpc/AGENTS.md.hbs
• UI components (optional): scaffold with pnpm turbo gen core-package ui, then see turbo/generators/templates/core-package/ui/AGENTS.md.hbs