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Merge pull request #23 from chogyejin/docs/typo
docs: ์˜คํƒˆ์ž ์ˆ˜์ •
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โ€ŽREADME.mdโ€Ž

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## TanStack Query(React) v5
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- โญ๏ธ TanStack Query(React)๊ฐ€ `23.10.17` v5๋ฅผ ๋ฆด๋ฆฌ์ฆˆ๋์Šต๋‹ˆ๋‹ค. ํ•ด๋‹น ๋ฌธ์„œ๋Š” v5๊ธฐ์ค€์œผ๋กœ ์ž‘์„ฑ๋˜์–ด ์žˆ์Šต๋‹ˆ๋‹ค.
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- โญ๏ธ TanStack Query(React) `v5`๊ฐ€ 23.10.17์— ๋ฆด๋ฆฌ์ฆˆ๋์Šต๋‹ˆ๋‹ค. ํ•ด๋‹น ๋ฌธ์„œ๋Š” `v5` ๊ธฐ์ค€์œผ๋กœ ์ž‘์„ฑ๋˜์–ด ์žˆ์Šต๋‹ˆ๋‹ค.
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- โญ๏ธ ๊ธฐ์กด `v4` ๋ฌธ์„œ๋Š” [react query tutorial v4 ๋ฌธ์„œ](https://github.com/ssi02014/react-query-tutorial/tree/master/README.v4.md)๋ฅผ ํ™•์ธํ•ด์ฃผ์„ธ์š”.
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![แ„‰แ…ณแ„แ…ณแ„…แ…ตแ†ซแ„‰แ…ฃแ†บ 2023-10-18 แ„‹แ…ฉแ„Œแ…ฅแ†ซ 2 09 09](https://github.com/ssi02014/react-query-tutorial/assets/64779472/84de2a61-7e39-4d52-aed8-b0ab67af95bc)
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12. [์‹คํŒจํ•œ ์ฟผ๋ฆฌ์— ๋Œ€ํ•ด ์žฌ์š”์ฒญํ•˜๋Š” retry](#retry)
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13. [onSuccess, onError, onSettled](#onsuccess-onerror-onsettled) - ๐Ÿ’ก **v5 @Deprecated**
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14. [select๋ฅผ ์ด์šฉํ•œ ๋ฐ์ดํ„ฐ ๋ณ€ํ™˜](#select)
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15. [์ฟผ๋ฆฌ๊ฐ€ pending์ƒํƒœ ๋™์•ˆ ๋ณด์—ฌ ์ค„ ์ˆ˜ ์žˆ์€ placeholderData](#placeholderdata)
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15. [์ฟผ๋ฆฌ๊ฐ€ pending ์ƒํƒœ์ธ ๋™์•ˆ ๋ณด์—ฌ ์ค„ ์ˆ˜ ์žˆ placeholderData](#placeholderdata)
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16. [Paginated ๊ตฌํ˜„์— ์œ ์šฉํ•œ keepPreviousData](#keepPreviousData) - ๐Ÿ’ก **v5 @Deprecated**
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17. [์ฟผ๋ฆฌ๋ฅผ ๋ณ‘๋ ฌ(Parallel) ์š”์ฒญํ•  ์ˆ˜ ์žˆ๋Š” useQueries](#parallel)
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18. [์ข…์† ์ฟผ๋ฆฌ(Dependent Queries)](#dependent-queries)
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- react-query๋Š” `์ „์šฉ devtools`๋ฅผ ์ œ๊ณตํ•œ๋‹ค.
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- devtools๋ฅผ ์‚ฌ์šฉํ•˜๋ฉด React Query์˜ ๋ชจ๋“  ๋‚ด๋ถ€ ๋™์ž‘์„ `์‹œ๊ฐํ™”`ํ•˜๋Š” ๋ฐ ๋„์›€์ด ๋˜๋ฉฐ ๋ฌธ์ œ๊ฐ€ ๋ฐœ์ƒํ•˜๋ฉด `๋””๋ฒ„๊น… ์‹œ๊ฐ„์„ ์ ˆ์•ฝ`ํ•  ์ˆ˜ ์žˆ๋‹ค.
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- devtools๋Š” ๊ธฐ๋ณธ๊ฐ’์œผ๋กœ `process.env.NODE_ENV === 'development'` ์ธ ๊ฒฝ์šฐ์—๋งŒ ์‹คํ–‰๋œ๋‹ค, ์ฆ‰ ์ผ๋ฐ˜์ ์œผ๋กœ ๊ฐœ๋ฐœํ™˜๊ฒฝ์—์„œ๋งŒ ์ž‘๋™ํ•˜๋ฏ€๋กœ ์„ค์ •๋˜์–ด์žˆ์œผ๋ฏ€๋กœ, ํ”„๋กœ์ ํŠธ ๋ฐฐํฌ ์‹œ์— Devtools ์‚ฝ์ž…์ฝ”๋“œ๋ฅผ ์ œ๊ฑฐํ•ด์ค„ ํ•„์š”๊ฐ€ ์—†๋‹ค.
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- **devtools ์‚ฌ์šฉํ•˜๊ธฐ ์œ„ํ•ด ๋ณ„๋„์˜ ํŒจํ‚ค์ง€ ์„ค์น˜๊ฐ€ ํ•„์š”ํ•˜๋‹ค.**
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- **devtools๋ฅผ ์‚ฌ์šฉํ•˜๊ธฐ ์œ„ํ•ด์„œ๋Š” ๋ณ„๋„์˜ ํŒจํ‚ค์ง€ ์„ค์น˜๊ฐ€ ํ•„์š”ํ•˜๋‹ค.**
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```bash
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$ npm i @tanstack/react-query-devtools
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```
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- combinedQueries๋Š” `data`์™€ `pending` ํ”„๋กœํผํ‹ฐ๋ฅผ ๊ฐ–๋Š”๋‹ค.
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- _Note_: ์ฐธ๊ณ ๋กœ ๊ฒฐํ•ฉํ•˜๋ฉด ์ฟผ๋ฆฌ ๊ฒฐ๊ณผ์˜ ๋‚˜๋จธ์ง€ ๋‹ค๋ฅธ ํ”„๋กœํผํ‹ฐ๋“ค์€ ์†์‹ค ๋œ๋‹ค.
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- _Note_: ์ฐธ๊ณ ๋กœ ๊ฒฐํ•ฉํ•˜๋ฉด ์ฟผ๋ฆฌ ๊ฒฐ๊ณผ์˜ ๋‚˜๋จธ์ง€ ๋‹ค๋ฅธ ํ”„๋กœํผํ‹ฐ๋“ค์€ ์†์‹ค๋œ๋‹ค.
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<br />
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[๋ชฉ์ฐจ ์ด๋™](#์ฃผ์š”-์ปจ์…‰-๋ฐ-๊ฐ€์ด๋“œ-๋ชฉ์ฐจ)
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- [Dependent Queries ๊ณต์‹ ๋ฌธ์„œ](https://tanstack.com/query/v5/docs/react/guides/dependent-queries)
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- `์ข…์† ์ฟผ๋ฆฌ`๋Š” ์–ด๋–ค A๋ผ๋Š” ์ฟผ๋ฆฌ๊ฐ€ ์žˆ๋Š”๋ฐ ์ด A์ฟผ๋ฆฌ๋ฅผ ์‹คํ–‰ํ•˜๊ธฐ ์ „์— ์‚ฌ์ „์— ์™„๋ฃŒ๋˜์–ด์•ผ ํ•˜๋Š” B ์ฟผ๋ฆฌ๊ฐ€ ์žˆ๋Š”๋ฐ, ์ด๋Ÿฌํ•œ B์ฟผ๋ฆฌ์— ์˜์กดํ•˜๋Š” A์ฟผ๋ฆฌ๋ฅผ ์ข…์† ์ฟผ๋ฆฌ๋ผ๊ณ  ํ•œ๋‹ค.
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- `์ข…์† ์ฟผ๋ฆฌ`๋Š” ์–ด๋–ค A๋ผ๋Š” ์ฟผ๋ฆฌ๊ฐ€ ์žˆ๋Š”๋ฐ ์ด A ์ฟผ๋ฆฌ๋ฅผ ์‹คํ–‰ํ•˜๊ธฐ ์ „์— ์‚ฌ์ „์— ์™„๋ฃŒ๋˜์–ด์•ผ ํ•˜๋Š” B ์ฟผ๋ฆฌ๊ฐ€ ์žˆ๋Š”๋ฐ, ์ด๋Ÿฌํ•œ B ์ฟผ๋ฆฌ์— ์˜์กดํ•˜๋Š” A ์ฟผ๋ฆฌ๋ฅผ ์ข…์† ์ฟผ๋ฆฌ๋ผ๊ณ  ํ•œ๋‹ค.
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- react-query์—์„œ๋Š” `enabled` ์˜ต์…˜์„ ํ†ตํ•ด ์ข…์† ์ฟผ๋ฆฌ๋ฅผ ์‰ฝ๊ฒŒ ๊ตฌํ˜„ํ•  ์ˆ˜ ์žˆ๋‹ค.
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```tsx
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- useQueryClient๋Š” `QueryClient` ์ธ์Šคํ„ด์Šค๋ฅผ ๋ฐ˜ํ™˜ํ•œ๋‹ค.
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- `QueryClient`๋Š” ์บ์‹œ์™€ ์ƒํ˜ธ์ž‘์šฉํ•œ๋‹ค.
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- QueryClient๋Š” ๋‹ค์Œ ๋ฌธ์„œ์—์„œ ์ž์„ธํ•˜๊ฒŒ ๋‹ค๋ฃฌ๋‹ค
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- QueryClient๋Š” ๋‹ค์Œ ๋ฌธ์„œ์—์„œ ์ž์„ธํ•˜๊ฒŒ ๋‹ค๋ฃฌ๋‹ค.
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- [QueryClient](https://github.com/ssi02014/react-query-tutorial/tree/master/document/queryClient.md)
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- [prefetching ๊ณต์‹ ๋ฌธ์„œ](https://tanstack.com/query/v5/docs/react/guides/prefetching)
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- prefetch๋Š” ๋ง ๊ทธ๋Œ€๋กœ ๋ฏธ๋ฆฌ fetchํ•ด์˜ค๊ฒ ๋‹ค๋Š” ์˜๋ฏธ์ด๋‹ค.
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- ๋น„๋™๊ธฐ ์š”์ฒญ์€ ๋ฐ์ดํ„ฐ ์–‘์ด ํด ์ˆ˜๋ก ๋ฐ›์•„์˜ค๋Š” ์†๋„๊ฐ€ ๋А๋ฆฌ๊ณ , ์‹œ๊ฐ„์ด ์˜ค๋ž˜๊ฑธ๋ฆฐ๋‹ค. ์‚ฌ์šฉ์ž ๊ฒฝํ—˜์„ ์œ„ํ•ด ๋ฐ์ดํ„ฐ๋ฅผ ๋ฏธ๋ฆฌ ๋ฐ›์•„์™€์„œ ์บ์‹ฑํ•ด๋†“์œผ๋ฉด? ์ƒˆ๋กœ์šด ๋ฐ์ดํ„ฐ๋ฅผ ๋ฐ›๊ธฐ์ „์— ์‚ฌ์šฉ์ž๊ฐ€ ์บ์‹ฑ๋œ ๋ฐ์ดํ„ฐ๋ฅผ ๋ณผ ์ˆ˜ ์žˆ์–ด `UX์— ์ข‹์€ ์˜ํ–ฅ`์„ ์ค„ ์ˆ˜ ์žˆ๋‹ค.
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- ๋น„๋™๊ธฐ ์š”์ฒญ์€ ๋ฐ์ดํ„ฐ ์–‘์ด ํด์ˆ˜๋ก ๋ฐ›์•„์˜ค๋Š” ์†๋„๊ฐ€ ๋А๋ฆฌ๊ณ , ์‹œ๊ฐ„์ด ์˜ค๋ž˜ ๊ฑธ๋ฆฐ๋‹ค. ์‚ฌ์šฉ์ž ๊ฒฝํ—˜์„ ์œ„ํ•ด ๋ฐ์ดํ„ฐ๋ฅผ ๋ฏธ๋ฆฌ ๋ฐ›์•„์™€์„œ ์บ์‹ฑํ•ด๋†“์œผ๋ฉด? ์ƒˆ๋กœ์šด ๋ฐ์ดํ„ฐ๋ฅผ ๋ฐ›๊ธฐ์ „์— ์‚ฌ์šฉ์ž๊ฐ€ ์บ์‹ฑ ๋œ ๋ฐ์ดํ„ฐ๋ฅผ ๋ณผ ์ˆ˜ ์žˆ์–ด `UX์— ์ข‹์€ ์˜ํ–ฅ`์„ ์ค„ ์ˆ˜ ์žˆ๋‹ค.
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- ์˜ˆ๋ฅผ ๋“ค์–ด ํŽ˜์ด์ง€๋„ค์ด์…˜์„ ๊ตฌํ˜„ํ–ˆ๋‹ค๊ณ  ๊ฐ€์ •ํ•˜๋ฉด, ํŽ˜์ด์ง€1์—์„œ ํŽ˜์ด์ง€2๋กœ ์ด๋™ํ–ˆ์„ ๋•Œ ํŽ˜์ด์ง€3์˜ ๋ฐ์ดํ„ฐ๋ฅผ ๋ฏธ๋ฆฌ ๋ฐ›์•„๋†“๋Š” ๊ฒƒ์ด๋‹ค!
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- react query์—์„œ๋Š” `queryClient.prefetchQuery`์„ ํ†ตํ•ด์„œ prefetch ๊ธฐ๋Šฅ์„ ์ œ๊ณตํ•œ๋‹ค.
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```tsx
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const prefetchNextPosts = async (nextPage: number) => {
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const queryClient = useQueryClient();
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// ํ•ด๋‹น ์ฟผ๋ฆฌ์˜ ๊ฒฐ๊ณผ๋Š” ์ผ๋ฐ˜ ์ฟผ๋ฆฌ๋“ค์ฒ˜๋Ÿผ ์บ์‹ฑ๋œ๋‹ค.
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// ํ•ด๋‹น ์ฟผ๋ฆฌ์˜ ๊ฒฐ๊ณผ๋Š” ์ผ๋ฐ˜ ์ฟผ๋ฆฌ๋“ค์ฒ˜๋Ÿผ ์บ์‹ฑ ๋œ๋‹ค.
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- infinite ์ฟผ๋ฆฌ๋Š” ๋ฐ”๋กœ ์•„๋ž˜์— ๋‚˜์˜ค๊ฒ ์ง€๋งŒ ์ผ๋ฐ˜ ์ฟผ๋ฆฌ๋“ค์ฒ˜๋Ÿผ infinite ์ฟผ๋ฆฌ๋„ prefetchํ•  ์ˆ˜ ์žˆ๋‹ค.
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- ๊ธฐ๋ณธ์ ์œผ๋กœ ์ฟผ๋ฆฌ์˜ `์ฒซ ๋ฒˆ์งธ ํŽ˜์ด์ง€๋งŒ prefetch`๋˜๋ฉฐ, ๊ทธ ์ด์ƒ์„ prefetchํ•˜๋ ค๋ฉด `pages ์˜ต์…˜`์„ ํ™œ์šฉํ•ด์•ผ ๋œ๋‹ค.
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- ์ด ๊ฒฝ์šฐ์—๋Š” `getNextPageParam` ํ•จ์ˆ˜๋ฅผ ๋ฌด์กฐ๊ฑด ์ œ๊ณตํ•ด์ค˜์•ผ ํ•œ๋‹ค๋Š” ์ ์„ ์ฃผ์˜ํ•˜์ž
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- ์ด ๊ฒฝ์šฐ์—๋Š” `getNextPageParam` ํ•จ์ˆ˜๋ฅผ ๋ฌด์กฐ๊ฑด ์ œ๊ณตํ•ด์ค˜์•ผ ํ•œ๋‹ค๋Š” ์ ์„ ์ฃผ์˜ํ•˜์ž.
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```tsx
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const prefetchTodos = async () => {

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