What are query key factories and why are they recommended for large Vue apps?

A query key factory centralises all key definitions in one file. This makes invalidations predictable, lets TypeScript catch typos at compile time, and means a renaming/restructuring only needs to happen in one place.

// queryKeys.ts
export const userKeys={
  all:     ()              => ["users"]            as const,
  lists:   ()              => ["users","list"]      as const,
  list:    (f:UserFilter)  => ["users","list",f]    as const,
  details: ()              => ["users","detail"]    as const,
  detail:  (id:number)     => ["users","detail",id] as const,
}

// Component
import { userKeys } from "@/queryKeys"
const { data:user }=useQuery({
  queryKey: userKeys.detail(userId.value),
  queryFn:  ()=>fetchUser(userId.value),
})

// Mutation onSuccess — invalidate ALL user queries
const { mutate:deleteUser }=useMutation({
  mutationFn: (id:number)=>fetch(`/api/users/${id}`,{method:"DELETE"}),
  onSuccess: ()=>{ qc.invalidateQueries({queryKey:userKeys.all()}) },
})

// TypeScript catches typos:
// userKeys.detial(1)         // TS Error: Property 'detial' does not exist
// ["users","detial",1]       // No error — typo silently creates wrong key

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