React Suspense for data fetching

                  import { Suspense } from 'react'
import { useSuspenseQuery } from '@tanstack/react-query'
import { useParams } from 'react-router-dom'
import api from '@/services/api'
import { Post } from '@/types'
import { ErrorBoundary } from '@/components/ErrorBoundary'

function PostContent() {
  const { id } = useParams()

  // Suspense-enabled query - throws promise if data not ready
  const { data: post } = useSuspenseQuery({
    queryKey: ['posts', id],
    queryFn: async () => {
      const { data } = await api.get<Post>(`/posts/${id}`)
      return data
    },
  })

  return (
    <article>
      <h1>{post.title}</h1>
      <div dangerouslySetInnerHTML={{ __html: post.body }} />
    </article>
  )
}

function PostComments({ postId }: { postId: string }) {
  const { data: comments } = useSuspenseQuery({
    queryKey: ['posts', postId, 'comments'],
    queryFn: async () => {
      const { data } = await api.get(`/posts/${postId}/comments`)
      return data
    },
  })

  return (
    <div className="mt-8">
      <h2>Comments</h2>
      {comments.map((comment: any) => (
        <div key={comment.id}>{comment.body}</div>
      ))}
    </div>
  )
}

export default function PostDetail() {
  const { id } = useParams()

  return (
    <ErrorBoundary>
      <Suspense fallback={<PostSkeleton />}>
        <PostContent />

        {/* Nested suspense for independent loading */}
        <Suspense fallback={<div>Loading comments...</div>}>
          <PostComments postId={id!} />
        </Suspense>
      </Suspense>
    </ErrorBoundary>
  )
}

function PostSkeleton() {
  return <div className="animate-pulse">Loading post...</div>
}