---

name: frontend-patterns description: React/Next.js data patterns - React Query hooks, ORPC client integration, error handling, cache invalidation. Complements frontend-design skill (visuals).

React/Next.js Patterns

Use this skill for data layer and React patterns. For visual design, use frontend-design skill.

Project Setup

Replace these placeholders for your project:

• @project/ → your package scope (e.g., @myapp/)
• apps/web/ paths follow standard monorepo layout

Expected setup:

• @project/auth - better-auth config
• @project/shared - SERVICE_URLS, shared types
• @/utils/orpc - ORPC client, queryClient

ORPC Client Setup

Copyimport { client, orpc, queryClient } from "@/utils/orpc";

const data = await client.item.get({});
const queryKey = orpc.item.get.queryOptions({}).queryKey;

Quick Patterns

Query Hook

Copy"use client";
import { useQuery } from "@tanstack/react-query";
import { orpc } from "@/utils/orpc";

export function useItems() {
  return useQuery(orpc.item.list.queryOptions({}));
}

Mutation Hook

Copy"use client";
import { useMutation, useQueryClient } from "@tanstack/react-query";
import { toast } from "sonner";
import { client, orpc } from "@/utils/orpc";

export function useCreateItem() {
  const queryClient = useQueryClient();

  return useMutation({
    mutationFn: async (input) => client.item.create(input),
    onSuccess: () => {
      queryClient.invalidateQueries({
        queryKey: orpc.item.list.queryOptions({ input: {} }).queryKey,
      });
      toast.success("Created!");
    },
    onError: (error) => {
      toast.error(error instanceof Error ? error.message : "Failed");
    },
  });
}

Additional Resources

• For detailed hook patterns and error handling, see hooks.md
• For auth client and provider setup, see providers.md

File Locations

Best Practices

1. Always "use client" at top of hook files
2. Import from @/utils/orpc for client/orpc/queryClient
3. Toast on success/error using Sonner
4. Invalidate related queries in onSuccess
5. Handle error codes explicitly with switch statement