queryOptions

function queryOptions<TQueryFnData = unknown, TError = Error, TData = TQueryFnData, TQueryKey extends readonly unknown[] = readonly unknown[]>(options: DefinedInitialDataOptions<TQueryFnData, TError, TData, TQueryKey>): DefinedInitialDataOptions<TQueryFnData, TError, TData, TQueryKey> & QueryKeyWithDataTag<TQueryKey, TQueryFnData, TError>;
function queryOptions<TQueryFnData = unknown, TError = Error, TData = TQueryFnData, TQueryKey extends readonly unknown[] = readonly unknown[]>(options: UnusedSkipTokenOptions<TQueryFnData, TError, TData, TQueryKey>): UnusedSkipTokenOptions<TQueryFnData, TError, TData, TQueryKey> & QueryKeyWithDataTag<TQueryKey, TQueryFnData, TError>;
function queryOptions<TQueryFnData = unknown, TError = Error, TData = TQueryFnData, TQueryKey extends readonly unknown[] = readonly unknown[]>(options: UndefinedInitialDataOptions<TQueryFnData, TError, TData, TQueryKey>): UndefinedInitialDataOptions<TQueryFnData, TError, TData, TQueryKey> & QueryKeyWithDataTag<TQueryKey, TQueryFnData, TError>;

function queryOptions<TQueryFnData = unknown, TError = Error, TData = TQueryFnData, TQueryKey extends readonly unknown[] = readonly unknown[]>(options: DefinedInitialDataOptions<TQueryFnData, TError, TData, TQueryKey>): DefinedInitialDataOptions<TQueryFnData, TError, TData, TQueryKey> & QueryKeyWithDataTag<TQueryKey, TQueryFnData, TError>;

import { queryOptions, useQuery } from '@tanstack/react-query'

export const postsOptions = queryOptions({
  queryKey: ['posts'],
  queryFn: fetchPosts,
  initialData: [],
})

function Posts() {
  // `data` is `Post[]`, never `undefined`, thanks to `initialData` — even if a refetch fails,
  // so the list stays visible alongside the error.
  const { data, isError, error } = useQuery(postsOptions)

  return (
    <div>
      {isError ? <span>Error: {error.message}</span> : null}
      <ul>
        {data.map((post) => <li key={post.id}>{post.title}</li>)}
      </ul>
    </div>
  )
}

function queryOptions<TQueryFnData = unknown, TError = Error, TData = TQueryFnData, TQueryKey extends readonly unknown[] = readonly unknown[]>(options: UnusedSkipTokenOptions<TQueryFnData, TError, TData, TQueryKey>): UnusedSkipTokenOptions<TQueryFnData, TError, TData, TQueryKey> & QueryKeyWithDataTag<TQueryKey, TQueryFnData, TError>;

import { queryOptions, useQuery } from '@tanstack/react-query'

export const postOptions = (id: string) =>
  queryOptions({
    queryKey: ['post', id],
    queryFn: () => fetchPost(id),
  })

function Post({ id }: { id: string }) {
  const { data, isPending, isError, error } = useQuery(postOptions(id))

  if (isPending) return 'Loading...'
  if (isError) return <span>Error: {error.message}</span>

  return <h1>{data.title}</h1>
}

function queryOptions<TQueryFnData = unknown, TError = Error, TData = TQueryFnData, TQueryKey extends readonly unknown[] = readonly unknown[]>(options: UndefinedInitialDataOptions<TQueryFnData, TError, TData, TQueryKey>): UndefinedInitialDataOptions<TQueryFnData, TError, TData, TQueryKey> & QueryKeyWithDataTag<TQueryKey, TQueryFnData, TError>;

import { queryOptions, useQuery } from '@tanstack/react-query'

export const postOptions = (id: string) =>
  queryOptions({
    queryKey: ['post', id],
    queryFn: () => fetchPost(id),
  })

function Post({ id }: { id: string }) {
  const { data, isPending, isError, error } = useQuery(postOptions(id))

  if (isPending) return 'Loading...'
  if (isError) return <span>Error: {error.message}</span>

  return <h1>{data.title}</h1>
}

import { queryOptions, skipToken, useQuery } from '@tanstack/react-query'

export const postOptions = (postId: number | undefined) =>
  queryOptions({
    queryKey: ['post', postId],
    queryFn: postId != null ? () => fetchPost(postId) : skipToken,
  })

function Post({ postId }: { postId: number | undefined }) {
  const { data, isLoading, isError, error } = useQuery(postOptions(postId))

  if (postId == null) return 'Select a post'
  if (isLoading) return 'Loading...'
  if (isError) return <span>Error: {error.message}</span>

  return <h1>{data?.title}</h1>
}