{"id":1172,"date":"2024-05-21T15:42:37","date_gmt":"2024-05-21T06:42:37","guid":{"rendered":"https:\/\/shinke1987.net\/?p=1172"},"modified":"2025-08-18T13:23:07","modified_gmt":"2025-08-18T04:23:07","slug":"react%ef%bc%9auseswr%e3%81%ae%e5%8b%95%e4%bd%9c%e7%a2%ba%e8%aa%8d","status":"publish","type":"post","link":"https:\/\/shinke1987.net\/?p=1172","title":{"rendered":"React\uff1auseSWR\u306e\u52d5\u4f5c\u78ba\u8a8d"},"content":{"rendered":"\n

\u74b0\u5883<\/h2>\n\n\n\n

React\uff1av18.3.1<\/p>\n\n\n\n

SWR\uff1av2.2.5<\/p>\n\n\n\n

<\/p>\n\n\n\n

isLoading\u3068isValidating\u306e\u52d5\u4f5c\u78ba\u8a8d\u3067\u306f\u6b21\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u5b9f\u884c\u3057\u305f\u3002<\/p>\n\n\n\n

React\uff1av19.1.0<\/p>\n\n\n\n

SWR\uff1av2.3.4<\/p>\n\n\n\n

\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb<\/h2>\n\n\n\n

\u4e0b\u8a18\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3057\u3066\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3059\u308b\u3002<\/p>\n\n\n

\n% npm install swr\n<\/pre><\/div>\n\n\n
\u30c6\u30b9\u30c8\u7528\u7c21\u6613\u30b5\u30fc\u30d0\u3092\u7528\u610f<\/h2>\n\n\n\n
HTTP\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u53d7\u3051\u53d6\u3063\u3066\u304b\u30892\u79d2\u5f8c\u306b\u30ec\u30b9\u30dd\u30f3\u30b9\u3092\u8fd4\u3059\u7c21\u6613\u30b5\u30fc\u30d0\u3092\u7528\u610f\u3059\u308b\u3002<\/p>\n\n\n\n
Express\u306e\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb<\/h3>\n\n\n
\n% mkdir \u30d5\u30a9\u30eb\u30c0\u540d && cd \u30d5\u30a9\u30eb\u30c0\u540d\n% npm init\n% npm install express\n\n\/\/ \u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3055\u308c\u305fExpress\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u306f4.19.2\u3060\u3063\u305f\u3002\n\n% vim app.js\n<\/pre><\/div>\n\n\n
app.js\u306e\u5185\u5bb9<\/h3>\n\n\n
\nconst express = require('express')\nconst app = express()\nconst port = 3001\n\nfunction sendResponse(res) {\n  res.send('ApiServer : ' + Date());\n}\n\nconst allowCrossDomain = function(req, res, next) {\n  res.header('Access-Control-Allow-Origin', '*')\n  res.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE')\n  res.header(\n    'Access-Control-Allow-Headers',\n    'Content-Type, Authorization, access_token'\n  )\n\n  \/\/ intercept OPTIONS method\n  if ('OPTIONS' === req.method) {\n    res.send(200)\n  } else {\n    next()\n  }\n}\n\napp.use(allowCrossDomain)\n\napp.get('\/', (req, res) => {\n  setTimeout(\n    sendResponse,\n    2000,\n    res \n  );  \n\n  \/\/ console.log('req = ', req);\n  \/\/ console.log('res = ', res);\n})\n\napp.listen(port, () => {\n  console.log(`Example app listening on port ${port}`)\n})\n<\/pre><\/div>\n\n\n
\u4e0a\u8a18app.js\u3092\u30b3\u30d4\u30da\u3057\u305f\u3089\u3001\u4e0b\u8a18\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3057\u3066\u30b5\u30fc\u30d0\u3092\u8d77\u52d5\u3059\u308b\u3002<\/p>\n\n\n
\n% nvm use node\n% node app.js\n<\/pre><\/div>\n\n\n
\u30b5\u30fc\u30d0\u8d77\u52d5\u5f8c\u3001Web\u30d6\u30e9\u30a6\u30b6\u3067 http:\/\/localhost:3001 \u3078\u30a2\u30af\u30bb\u30b9\u3057\u3001
\u300cApiServer : \uff08\u65e5\u6642\uff09\u300d\u30682\u79d2\u5f8c\u306b\u8868\u793a\u3055\u308c\u308c\u3070\u826f\u3044\u3002<\/p>\n\n\n\n
App.tsx\u306e\u5185\u5bb9<\/h2>\n\n\n
\nimport React, {\n  createContext, ReactNode, Suspense, useEffect, useLayoutEffect,\n} from 'react';\nimport UseSwr from '.\/UseSwr.tsx';\nimport Fetch from '.\/Fetch.tsx';\n\n  return (\n    <>\n      <Fetch \/>\n      <hr \/>\n      <Suspense fallback={<div>Now Loading...<\/div>}>\n        <UseSwr \/>\n      <\/Suspense>\n    <\/>\n  );\n}\n\nexport default App;\n<\/pre><\/div>\n\n\n
Fetch.tsx\u306e\u5185\u5bb9<\/h2>\n\n\n
\nimport { ReactNode, useState } from 'react';\n\nfunction Fetch(): ReactNode {\n  const [showFetchData, setShowFetchData] = useState<Promise<string>|string>('\u521d\u671f\u5024');\n  const [startFetchData, setStartFetchData] = useState<string>('\u521d\u671f\u5024');\n  const [endFetchData, setEndFetchData] = useState<string>('\u521d\u671f\u5024');\n  const [countFetchData, setCountFetchData] = useState<number>(0);\n\n  async function fetchData(): Promise<void> {\n    setStartFetchData(Date());\n\n    const response: Response = await fetch('http:\/\/localhost:3001');\n    const promiseText: string = await response.text();\n    setShowFetchData(promiseText);\n\n    setEndFetchData(Date());\n    setCountFetchData(countFetchData + 1);\n  }\n\n  return (\n    <>\n      <div>\n        {`countFetchData = ${countFetchData}`}\n        <br \/>\n        {`startFetchData = ${startFetchData}`}\n        <br \/>\n        {`showFetchData = ${showFetchData}`}\n        <br \/>\n        {`endFetchData = ${endFetchData}`}\n      <\/div>\n\n      <div>\n        <button\n          type="button"\n          onClick={fetchData}\n        >\n          fetchData\n        <\/button>\n      <\/div>\n    <\/>\n  );\n}\n\nexport default Fetch;\n<\/pre><\/div>\n\n\n
UseSwr.tsx\u306e\u5185\u5bb9<\/h2>\n\n\n
\nimport { ReactNode, useState } from 'react';\nimport useSWR, { useSWRConfig } from 'swr';\n\nfunction UseSwr(): ReactNode {\n  \/\/ swrData\u95a2\u6570\u7528\u3002\n  const [startSwrData, setStartSwrData] = useState<string>('\u521d\u671f\u5024');\n  const [endSwrData, setEndSwrData] = useState<string>('\u521d\u671f\u5024');\n  const [countSwrData, setCountSwrData] = useState<number>(0);\n  const [aboutCache, setAboutCache] = useState<ReactNode>(null);\n\n  \/\/ \u30ad\u30e3\u30c3\u30b7\u30e5\u30dc\u30bf\u30f3\u306e\u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9\u3067\u4f7f\u7528\u3002\n  const config = useSWRConfig();\n\n  \/\/ useSWR\u30d5\u30c3\u30af\u3067\u4f7f\u7528\u3055\u308c\u308bfetcher\u3002\n  async function fetcher(url: string): Promise<string> {\n    setStartSwrData(Date());\n\n    const promiseFetch: Response = await fetch(url);\n\n    setEndSwrData(Date());\n    setCountSwrData(countSwrData + 1);\n\n    return promiseFetch.text();\n  }\n\n  \/\/ useSWR\u30d5\u30c3\u30af\u304c\u6210\u529f\u3057\u305f\u5f8c\u306b\u5b9f\u884c\u3055\u308c\u308b\u95a2\u6570\u3002\n  function swrOnSuccess(): void {\n    console.log('swrOnSuccess');\n    setCountSwrData(countSwrData + 1);\n  }\n\n  const { data, mutate } = useSWR<string>(\n    'http:\/\/localhost:3001',\n    fetcher,\n    {\n      suspense: true, \/\/ Suspense\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u7528\u300220240521_\u975e\u63a8\u5968\u3068\u306a\u3063\u3066\u3044\u308b\u3002\n      onSuccess: swrOnSuccess, \/\/ \u6210\u529f\u3057\u305f\u5f8c\u306b\u5b9f\u884c\u3055\u308c\u308b\u95a2\u6570\u3002\n      revalidateIfStale: true, \/\/ \u53e4\u3044\u30c7\u30fc\u30bf\u304c\u3042\u3063\u3066\u3082\u66f4\u65b0\u3059\u308b\u3002\n      revalidateOnFocus: false, \/\/ \u30d5\u30a9\u30fc\u30ab\u30b9\u3055\u308c\u3066\u3082\u66f4\u65b0\u3057\u306a\u3044\u3002\n      revalidateOnReconnect: false, \/\/ \u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u63a5\u7d9a\u5fa9\u5e30\u6642\u306b\u66f4\u65b0\u3057\u306a\u3044\u3002\n    },\n  );\n\n  const getAboutCache = () => {\n    let component: ReactNode = '';\n\n    config.cache.entries().forEach(([key, value]) => {\n      component += `<div><div>key = ${key}<\/div><div>value.data = ${value.data}<\/div><\/div><br\/>`;\n    });\n    component += `<div>config.cache.size = ${config.cache.size}<\/div>`;\n\n    setAboutCache(component);\n  };\n\n  const handleRefresh = () => {\n    \/\/ \u30d0\u30a6\u30f3\u30c9\u30df\u30e5\u30fc\u30c6\u30fc\u30c8\u3092\u5229\u7528\u3002\n    \/\/ Suspense\u306efallback\u306f\u8868\u793a\u3055\u308c\u306a\u3044\u3002\n    mutate();\n  };\n\n  return (\n    <>\n      <div>\n        {`countSwrData = ${countSwrData}`}\n        <br \/>\n        {`startSwrData = ${startSwrData}`}\n        <br \/>\n        {`showSwrData = ${data}`}\n        <br \/>\n        {`endSwrData = ${endSwrData}`}\n      <\/div>\n\n      <div>\n        <button\n          type="button"\n          onClick={getAboutCache}\n        >\n          \u30ad\u30e3\u30c3\u30b7\u30e5\n        <\/button>\n      <\/div>\n\n      {aboutCache\n        && (\n          <>\n            <br \/>\n            <div dangerouslySetInnerHTML={{ __html: aboutCache }} \/>\n          <\/>\n        )}\n\n      <br \/>\n      <button\n        type="button"\n        onClick={handleRefresh}\n      >\n        \u66f4\u65b0\n      <\/button>\n    <\/>\n  );\n}\n\nexport default UseSwr;\n<\/pre><\/div>\n\n\n
\u7d50\u679c<\/h2>\n\n\n\n
\"\"<\/figure>\n\n\n\n
useSWR\u3092\u5229\u7528\u3057\u305f\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u4f5c\u6210\u4f8b<\/h2>\n\n\n
\nimport { ReactNode } from 'react';\nimport useSWR from 'swr';\n\nasync function fetcher(tempUrl: string): Promise<string|null> {\n  const response = await fetch(tempUrl);\n  return response.text();\n}\n\n\/**\n * useSWR\u3092\u5229\u7528\u3057\u305f\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u4f5c\u6210\u3059\u308b\u5834\u5408\u306e\u4f8b\u3002\n * @constructor\n *\/\n\nfunction UseSwrComponent(): ReactNode {\n  const url: string = 'http:\/\/localhost:3001';\n\n\n  const {\n    data, error, isLoading, isValidating, mutate,\n  } = useSWR(\n    url,\n    fetcher,\n  );\n\n\n  if (error) return <div>error<\/div>;\n  if (isLoading) return <div>loading<\/div>;\n  if (isValidating) return <div>validating<\/div>;\n\n\n  function handleBtnMutate() {\n    mutate();\n  }\n\n\n  return (\n    <div>\n      <div>\n        {data}\n      <\/div>\n      <div>\n        <button\n          type="button"\n          onClick={handleBtnMutate}\n        >\n          mutate\n        <\/button>\n      <\/div>\n    <\/div>\n  );\n}\n\nexport default UseSwrComponent;\n\n<\/pre><\/div>\n\n\n
\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u4e00\u90e8\u306buseSWR\u3092\u5229\u7528\u3057\u305f\u30c7\u30fc\u30bf\u3092\u8868\u793a\u3059\u308b\u4f8b\uff08State\u4e0d\u4f7f\u7528\uff09<\/h2>\n\n\n
\nimport { ReactNode } from 'react';\nimport useSWR from 'swr';\n\nasync function fetcher(tempUrl: string): Promise<string|null> {\n  const response = await fetch(tempUrl);\n  return response.text();\n}\n\n\/**\n * \u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u4e00\u90e8\u5206\u306buseSWR\u3092\u5229\u7528\u3057\u305f\u30c7\u30fc\u30bf\u3092\u8868\u793a\u3059\u308b\u5834\u5408\u306e\u4f8b\u3002\n * State\u3092\u4f7f\u308f\u306a\u3044\u3084\u308a\u65b9\u3002\n * @constructor\n *\/\n\nfunction ContainUseSwrData(): ReactNode {\n  const url: string = 'http:\/\/localhost:3001';\n  let contents: string = 'loading or validating';\n\n\n  const {\n    data, error, isLoading, isValidating, mutate,\n  } = useSWR(\n    url,\n    fetcher,\n  );\n\n\n  \/\/ let\u3067\u5b9a\u7fa9\u3055\u308c\u305f\u5909\u6570\u3067\u306a\u304f\u3001useState\u3067\u4f5c\u6210\u3055\u308c\u305fset\u95a2\u6570\u3092\u5229\u7528\u3059\u308b\u3068TooManyReRender\u306e\u30a8\u30e9\u30fc\u3068\u306a\u308b\u3002\n  if (error) contents = 'error';\n  if (!isLoading && !isValidating) contents = String(data);\n\n\n  function handleBtnMutate() {\n    mutate();\n  }\n\n\n  return (\n    <div>\n      <div>\n        {contents}\n      <\/div>\n      <div>\n        <button\n          type="button"\n          onClick={handleBtnMutate}\n        >\n          mutate\n        <\/button>\n      <\/div>\n    <\/div>\n  );\n}\n\nexport default ContainUseSwrData;\n\n<\/pre><\/div>\n\n\n
\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u4e00\u90e8\u306buseSWR\u3092\u5229\u7528\u3057\u305f\u30c7\u30fc\u30bf\u3092\u8868\u793a\u3059\u308b\u4f8b\uff08State\u4f7f\u7528\uff09<\/h2>\n\n\n
\nimport { ReactNode, useEffect, useState } from 'react';\nimport useSWR from 'swr';\n\nasync function fetcher(tempUrl: string): Promise<string> {\n  const response = await fetch(tempUrl);\n  return response.text();\n}\n\n\/**\n * \u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u4e00\u90e8\u5206\u306buseSWR\u3092\u5229\u7528\u3057\u305f\u30c7\u30fc\u30bf\u3092\u8868\u793a\u3059\u308b\u5834\u5408\u306e\u4f8b\u3002\n * State\u3092\u5229\u7528\u3059\u308b\u3084\u308a\u65b9\u3002\n * @constructor\n *\/\nfunction ContainUseSwrData2(): ReactNode {\n  const url: string = 'http:\/\/localhost:3001';\n  const [contents, setContents] = useState<string>('');\n  let tempContents = 'loading or validating';\n\n\n  const {\n    data, error, isLoading, isValidating, mutate,\n  } = useSWR(\n    url,\n    fetcher,\n  );\n\n\n  if (error) tempContents = 'error';\n  if (!isLoading && !isValidating) tempContents = String(data);\n\n\n  useEffect(() => {\n    setContents(tempContents);\n  }, [tempContents]);\n\n\n  function handleBtnMutate() {\n    mutate();\n  }\n\n\n  return (\n    <div>\n      <div>\n        {contents}\n      <\/div>\n      <div>\n        <button\n          type="button"\n          onClick={handleBtnMutate}\n        >\n          mutate\n        <\/button>\n      <\/div>\n    <\/div>\n  );\n}\n\nexport default ContainUseSwrData2;\n\n<\/pre><\/div>\n\n\n
isLoading\u3068isValidating\u306e\u52d5\u4f5c\u78ba\u8a8d<\/h2>\n\n\n\n
\u6982\u8981<\/h3>\n\n\n\n
\u4e0a\u8a18\u306e\u30c6\u30b9\u30c8\u7528\u7c21\u6613\u30b5\u30fc\u30d0\u3092\u8d77\u52d5\u3057\u3001\u4e0b\u8a18Default.tsx\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092Web\u30d6\u30e9\u30a6\u30b6\u3067\u8868\u793a\u3057\u3001mutate\u30dc\u30bf\u30f3\u3092\u5b9f\u884c\u3059\u308b\u3002<\/p>\n\n\n\n
Default.tsx\u306e\u5185\u5bb9<\/h3>\n\n\n
\nimport { type ReactNode, useLayoutEffect } from 'react'\nimport useSWR from 'swr'\n\nfunction Default(): ReactNode {\n\n\n  const {data, isLoading, isValidating, error, mutate} = useSWR<string>(\n    'http:\/\/localhost:3001',\n    async (url: string): Promise<string> => {\n      const response = await fetch(url);\n      return response.text();\n    }\n  );\n\n\n  console.log('=======================================================');\n  console.log(`data = ${data}`);\n  console.log(`isLoading = ${isLoading}`);\n  console.log(`isValidating = ${isValidating}`);\n  console.log(`error = ${error}`);\n  console.log('=======================================================');\n\n\n  useLayoutEffect(() => {\n    console.log('\u521d\u671f\u63cf\u753b');\n  }, []);\n\n\n  const clickBtnMutate = () => {\n    console.log('mutate\u30dc\u30bf\u30f3\u304c\u30af\u30ea\u30c3\u30af\u3055\u308c\u307e\u3057\u305f');\n    mutate();\n  }\n\n\n  return (\n    <>\n      Default.tsx\n      <br \/>\n      <button type="button" onClick={clickBtnMutate}>\n        mutate\n      <\/button>\n    <\/>\n  );\n}\n\nexport default Default;\n<\/pre><\/div>\n\n\n
\u7d50\u679c\uff08\u30b3\u30f3\u30bd\u30fc\u30eb\u306e\u8868\u793a\u5185\u5bb9\uff09<\/h3>\n\n\n
\n=======================================================\ndata = undefined\nisLoading = true\nisValidating = true\nerror = undefined\n=======================================================\n\u521d\u671f\u63cf\u753b\n=======================================================\ndata = ApiServer : Fri Jul 18 2025 15:55:38 GMT+0900 (\u65e5\u672c\u6a19\u6e96\u6642) \nisLoading = false\nisValidating = false\nerror = undefined\n=======================================================\nmutate\u30dc\u30bf\u30f3\u304c\u30af\u30ea\u30c3\u30af\u3055\u308c\u307e\u3057\u305f\n=======================================================\ndata = ApiServer : Fri Jul 18 2025 15:55:38 GMT+0900 (\u65e5\u672c\u6a19\u6e96\u6642) \nisLoading = false\nisValidating = true\nerror = undefined\n=======================================================\n=======================================================\ndata = ApiServer : Fri Jul 18 2025 15:55:44 GMT+0900 (\u65e5\u672c\u6a19\u6e96\u6642) \nisLoading = false\nisValidating = false\nerror = undefined\n=======================================================\n<\/pre><\/div>\n\n\n
mutate\u306bdata\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u6e21\u3057\u305f\u6642\u306e\u52d5\u4f5c\u78ba\u8a8d<\/h2>\n\n\n\n
\u6982\u8981<\/h3>\n\n\n\n
\u4e0a\u8a18\u306e\u30c6\u30b9\u30c8\u7528\u7c21\u6613\u30b5\u30fc\u30d0\u3092\u8d77\u52d5\u3057\u3001\u4e0b\u8a18Default.tsx\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092Web\u30d6\u30e9\u30a6\u30b6\u3067\u8868\u793a\u3057\u3001mutate\u30dc\u30bf\u30f3\u3092\u5b9f\u884c\u3059\u308b\u3002<\/p>\n\n\n\n
Default.tsx\u306e\u5185\u5bb9<\/h3>\n\n\n
\nimport { type ReactNode, useLayoutEffect } from 'react'\nimport useSWR from 'swr'\n\nfunction Default(): ReactNode {\n\n\n  const {data, isLoading, isValidating, error, mutate} = useSWR<string>(\n    'http:\/\/localhost:3001',\n    async (url: string): Promise<string> => {\n      const response = await fetch(url);\n      return response.text();\n    }\n  );\n\n\n  console.log('=======================================================');\n  console.log(`data = ${data}`);\n  console.log(`isLoading = ${isLoading}`);\n  console.log(`isValidating = ${isValidating}`);\n  console.log(`error = ${error}`);\n  console.log('=======================================================');\n\n\n  useLayoutEffect(() => {\n    console.log('\u521d\u671f\u63cf\u753b');\n  }, []);\n\n\n  const clickBtnMutateWithOutData = () => {\n    console.log('mutate(without data)\u30dc\u30bf\u30f3\u304c\u30af\u30ea\u30c3\u30af\u3055\u308c\u307e\u3057\u305f');\n    mutate();\n  }\n\n\n  const clickBtnMutateWithData = () => {\n    console.log('mutate(with data)\u30dc\u30bf\u30f3\u304c\u30af\u30ea\u30c3\u30af\u3055\u308c\u307e\u3057\u305f');\n    mutate('abc');\n  }\n\n\n  return (\n    <>\n      Default.tsx\n      <br \/>\n\n      <button type="button" onClick={clickBtnMutateWithOutData}>\n        mutate(without data)\n      <\/button>\n      <br \/>\n\n      <button type="button" onClick={clickBtnMutateWithData}>\n        mutate(with data)\n      <\/button>\n    <\/>\n  );\n}\n\nexport default Default;\n<\/pre><\/div>\n\n\n
\u7d50\u679c\uff08\u30b3\u30f3\u30bd\u30fc\u30eb\u306e\u8868\u793a\u5185\u5bb9\uff09<\/h3>\n\n\n
\n=======================================================\ndata = undefined\nisLoading = true\nisValidating = true\nerror = undefined\n=======================================================\n\u521d\u671f\u63cf\u753b\n=======================================================\ndata = ApiServer : Fri Jul 18 2025 17:02:07 GMT+0900 (\u65e5\u672c\u6a19\u6e96\u6642) \nisLoading = false\nisValidating = false\nerror = undefined\n=======================================================\nmutate(without data)\u30dc\u30bf\u30f3\u304c\u30af\u30ea\u30c3\u30af\u3055\u308c\u307e\u3057\u305f\n=======================================================\ndata = ApiServer : Fri Jul 18 2025 17:02:07 GMT+0900 (\u65e5\u672c\u6a19\u6e96\u6642) \nisLoading = false\nisValidating = true\nerror = undefined\n=======================================================\n=======================================================\ndata = ApiServer : Fri Jul 18 2025 17:02:12 GMT+0900 (\u65e5\u672c\u6a19\u6e96\u6642) \nisLoading = false\nisValidating = false\nerror = undefined\n=======================================================\nmutate(with data)\u30dc\u30bf\u30f3\u304c\u30af\u30ea\u30c3\u30af\u3055\u308c\u307e\u3057\u305f\n=======================================================\ndata = abc \nisLoading = false\nisValidating = true\nerror = undefined\n=======================================================\n=======================================================\ndata = ApiServer : Fri Jul 18 2025 17:02:17 GMT+0900 (\u65e5\u672c\u6a19\u6e96\u6642) \nisLoading = false\nisValidating = false\nerror = undefined\n=======================================================\n<\/pre><\/div>\n\n\n
mutate\u306e\u53d6\u5f97\u7d50\u679c\u304c\u524d\u56de\u3068\u540c\u4e00\u306e\u6642\u306b\u63cf\u753b\u3059\u308b\u304b\u306e\u78ba\u8a8d<\/h2>\n\n\n\n
\u6982\u8981<\/h3>\n\n\n\n
Express\u304b\u3089\u8fd4\u3055\u308c\u308b\u5185\u5bb9\u3092\u540c\u4e00\u306e\u3082\u306e\u306b\u5909\u66f4\u3059\u308b\u305f\u3081\u306b\u6b21\u306e\u5909\u66f4\u3092\u884c\u3046\u3002<\/p>\n\n\n\n
\u30c6\u30b9\u30c8\u7528\u7c21\u6613\u30b5\u30fc\u30d0\u306eapp.js\u306e6\u884c\u76ee\u3092\u6b21\u306e\u3088\u3046\u306b\u5909\u66f4\u3059\u308b\u3002<\/p>\n\n\n\n
\u5909\u66f4\u524d\uff1ares.send(‘ApiServer : ‘ + Date());<\/p>\n\n\n\n
\u5909\u66f4\u5f8c\uff1ares.send(‘ApiServer’);<\/p>\n\n\n\n
<\/p>\n\n\n\n
\u63cf\u753b\u3055\u308c\u308b\u304b\u3069\u3046\u304b\u306fuseLayoutEffect\u30d5\u30c3\u30af\u3092\u5229\u7528\u3057\u3066\u78ba\u8a8d\u3059\u308b\u3002<\/p>\n\n\n\n
<\/p>\n\n\n\n
\u5909\u66f4\u6e08\u307f\u306e\u30c6\u30b9\u30c8\u7528\u7c21\u6613\u30b5\u30fc\u30d0\u3092\u8d77\u52d5\u3057\u3001\u4e0b\u8a18Draw.tsx\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092Web\u30d6\u30e9\u30a6\u30b6\u3067\u8868\u793a\u3057\u3001mutate\u30dc\u30bf\u30f3\u3092\u5b9f\u884c\u3059\u308b\u3002<\/p>\n\n\n\n
Draw.tsx\u306e\u5185\u5bb9<\/h3>\n\n\n
\nimport { type ReactNode, useLayoutEffect } from 'react'\nimport useSWR from 'swr'\n\nfunction Draw(): ReactNode {\n\n  const {data, isLoading, isValidating, error, mutate} = useSWR<string>(\n    'http:\/\/localhost:3001',\n    async (url: string): Promise<string> => {\n      const response = await fetch(url);\n      return response.text();\n    }\n  );\n\n\n  console.log('=======================================================');\n  console.log(`data = ${data}`);\n  console.log(`isLoading = ${isLoading}`);\n  console.log(`isValidating = ${isValidating}`);\n  console.log(`error = ${error}`);\n  console.log('=======================================================');\n\n\n  useLayoutEffect(() => {\n    console.log('\u521d\u671f\u63cf\u753b');\n  }, []);\n\n\n  useLayoutEffect(() => {\n    console.log('\u63cf\u753b');\n  });\n\n\n  const clickBtnMutate = () => {\n    mutate();\n  }\n\n  return (\n    <>\n      Draw.tsx\n      <br \/>\n\n      <button type="button" onClick={clickBtnMutate}>\n        mutate\n      <\/button>\n      <br \/>\n\n      data = {data}\n    <\/>\n  );\n}\n\nexport default Draw;\n<\/pre><\/div>\n\n\n
\u7d50\u679c\uff08\u30b3\u30f3\u30bd\u30fc\u30eb\u306e\u8868\u793a\u5185\u5bb9\uff09<\/h3>\n\n\n
\n=======================================================\ndata = undefined \nisLoading = true\nisValidating = true\nerror = undefined \n=======================================================\n\u521d\u671f\u63cf\u753b\n\u63cf\u753b\n=======================================================\ndata = ApiServer \nisLoading = false\nisValidating = false\nerror = undefined \n=======================================================\n\u63cf\u753b\n=======================================================\ndata = ApiServer \nisLoading = false\nisValidating = true\nerror = undefined \n=======================================================\n\u63cf\u753b\n=======================================================\ndata = ApiServer \nisLoading = false\nisValidating = false\nerror = undefined \n=======================================================\n\u63cf\u753b\n<\/pre><\/div>\n\n\n
\u30ad\u30e3\u30c3\u30b7\u30e5\u306edata\u3092\u524a\u9664\u306e\u52d5\u4f5c\u78ba\u8a8d<\/h2>\n\n\n\n
\u6982\u8981<\/h3>\n\n\n\n
\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u60c5\u5831\u3092\u8868\u793a\u3057\u3001\u524a\u9664\u3059\u308b\u52d5\u4f5c\u78ba\u8a8d\u3002<\/p>\n\n\n\n
\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u8868\u793a\u65b9\u6cd5\u306f\u672cWeb\u30da\u30fc\u30b8\u4e0a\u90e8\u306e\u65b9\u6cd5\u3068\u5c11\u3057\u9055\u3046\u3002<\/p>\n\n\n\n
\u30ad\u30e3\u30c3\u30b7\u30e5\u306edata\u3092\u524a\u9664\u3059\u308b\u3060\u3051\u3067\u3001\u30ad\u30fc\u306f\u6d88\u3048\u306a\u3044\u3002<\/p>\n\n\n\n
<\/p>\n\n\n\n
\u30c6\u30b9\u30c8\u7528\u7c21\u6613\u30b5\u30fc\u30d0\u3092\u8d77\u52d5\u3057\u3001\u4e0b\u8a18Cache.tsx\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092Web\u30d6\u30e9\u30a6\u30b6\u3067\u8868\u793a\u3057\u3001mutate\u30dc\u30bf\u30f3\u3092\u62bc\u4e0b\u3057\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u30dc\u30bf\u30f3\u3092\u524a\u9664\u30dc\u30bf\u30f3\u3092\u62bc\u4e0b\u3059\u308b\u3002<\/p>\n\n\n\n
Cache.tsx\u306e\u5185\u5bb9<\/h3>\n\n\n
\nimport type { ReactNode } from 'react'\nimport useSWR, { mutate, useSWRConfig } from 'swr'\n\nfunction Cache(): ReactNode {\n\n  const url: string = 'http:\/\/localhost:3001';\n  const {cache} = useSWRConfig();\n\n  const {data} = useSWR<string>(\n    url,\n    async (url: string): Promise<string> => {\n      const response = await fetch(url);\n      return response.text();\n    }\n  );\n\n\n  console.log('=================================');\n  console.log('\u30ad\u30e3\u30c3\u30b7\u30e5\u60c5\u5831');\n  for (const key of cache.keys()) {\n    console.log(`cache key = ${key}`);\n    console.log(`cache data = ${cache.get(key)?.data}`);\n  }\n  console.log('=================================');\n\n\n  const deleteCache = () => {\n    console.log('\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u524a\u9664\u30dc\u30bf\u30f3\u304c\u62bc\u4e0b\u3055\u308c\u307e\u3057\u305f');\n    mutate(url, undefined, {revalidate: false});\n  }\n\n\n  const refresh = () => {\n    console.log('mutate\u30dc\u30bf\u30f3\u304c\u62bc\u4e0b\u3055\u308c\u307e\u3057\u305f');\n    mutate(url);\n  }\n\n\n  return (\n    <>\n      <button type={'button'} onClick={refresh}>\n        mutate\n      <\/button>\n      <br \/>\n\n      <button type={'button'} onClick={deleteCache}>\n        \u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u524a\u9664\n      <\/button>\n      <br \/>\n\n      data = {data}\n    <\/>\n  );\n}\n\nexport default Cache;\n<\/pre><\/div>\n\n\n
\u7d50\u679c\uff08\u30b3\u30f3\u30bd\u30fc\u30eb\u306e\u8868\u793a\u5185\u5bb9\uff09<\/h3>\n\n\n
\n=================================\n\u30ad\u30e3\u30c3\u30b7\u30e5\u60c5\u5831 \n=================================\n=================================\n\u30ad\u30e3\u30c3\u30b7\u30e5\u60c5\u5831 \ncache key = http:\/\/localhost:3001\ncache data = ApiServer : Fri Jul 18 2025 23:10:39 GMT+0900 (\u65e5\u672c\u6a19\u6e96\u6642) \n=================================\nmutate\u30dc\u30bf\u30f3\u304c\u62bc\u4e0b\u3055\u308c\u307e\u3057\u305f \n=================================\n\u30ad\u30e3\u30c3\u30b7\u30e5\u60c5\u5831 \ncache key = http:\/\/localhost:3001\ncache data = ApiServer : Fri Jul 18 2025 23:10:44 GMT+0900 (\u65e5\u672c\u6a19\u6e96\u6642) \n=================================\n\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u524a\u9664\u30dc\u30bf\u30f3\u304c\u62bc\u4e0b\u3055\u308c\u307e\u3057\u305f \n=================================\n\u30ad\u30e3\u30c3\u30b7\u30e5\u60c5\u5831 \ncache key = http:\/\/localhost:3001\ncache data = undefined\n=================================\n<\/pre><\/div>\n\n\n
keepPreviousData\u306e\u52d5\u4f5c\u78ba\u8a8d<\/h2>\n\n\n\n
\u6982\u8981<\/h3>\n\n\n\n
keepPreviousData\u30aa\u30d7\u30b7\u30e7\u30f3\u304c\u6709\u52b9\u306a\u72b6\u614b\u3068\u3001\u7121\u52b9\u306a\u72b6\u614b\u3092\u6bd4\u8f03\u3059\u308b\u3002<\/p>\n\n\n\n
useSWR\u306e\u30ad\u30fc\u3092\u5909\u66f4\u3059\u308b\u5834\u5408\u306b\u5f79\u7acb\u3064\u3053\u3068\u3082\u3042\u308b\u306f\u305a\u3002<\/p>\n\n\n\n
<\/p>\n\n\n\n
\u30c6\u30b9\u30c8\u7528\u7c21\u6613\u30b5\u30fc\u30d0\u3092\u8d77\u52d5\u3057\u3001\u4e0b\u8a18KeepPreviousData.tsx\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092Web\u30d6\u30e9\u30a6\u30b6\u3067\u8868\u793a\u3057\u3001\u30ad\u30fc\u3092\u5909\u66f4\u30dc\u30bf\u30f3\u3092\u62bc\u4e0b\u3059\u308b\u3002<\/p>\n\n\n\n
KeepPreviousData.tsx\u306e\u5185\u5bb9<\/h3>\n\n\n
\nimport { type ReactNode, useState } from 'react'\nimport useSWR from 'swr'\n\nfunction KeepPreviousData(): ReactNode {\n\n  const url: string = 'http:\/\/localhost:3001';\n  const [swrKey, setSwrKey] = useState<number>(0);\n\n  const {data} = useSWR<string>(\n    swrKey.toString(),\n    async (): Promise<string> => {\n      const response = await fetch(url);\n      return response.text();\n    },\n    {\n      keepPreviousData: true,\n    }\n  );\n\n  \n  console.log(`data = ${data}`);\n\n\n  const clickBtn = () => {\n    console.log('\u30ad\u30fc\u3092\u5909\u66f4\u30dc\u30bf\u30f3\u304c\u62bc\u4e0b\u3055\u308c\u307e\u3057\u305f');\n    setSwrKey(swrKey + 1);\n  }\n\n\n  return (\n    <>\n      <button type={'button'} onClick={clickBtn}>\n        \u30ad\u30fc\u3092\u5909\u66f4\n      <\/button>\n      <br \/>\n      \n      data = {data}\n    <\/>\n  );\n}\n\nexport default KeepPreviousData;\n<\/pre><\/div>\n\n\n
\u7d50\u679c\uff08\u30b3\u30f3\u30bd\u30fc\u30eb\u306e\u8868\u793a\u5185\u5bb9\uff09<\/h3>\n\n\n\n
keepPreviousData\u304c\u7121\u52b9\u306a\u5834\u5408<\/h4>\n\n\n
\ndata = undefined\ndata = ApiServer : Fri Jul 18 2025 23:55:49 GMT+0900 (\u65e5\u672c\u6a19\u6e96\u6642)\n\u30ad\u30fc\u3092\u5909\u66f4\u30dc\u30bf\u30f3\u304c\u62bc\u4e0b\u3055\u308c\u307e\u3057\u305f\ndata = undefined\ndata = ApiServer : Fri Jul 18 2025 23:55:54 GMT+0900 (\u65e5\u672c\u6a19\u6e96\u6642)\n<\/pre><\/div>\n\n\n
keepPreviousData\u304c\u6709\u52b9\u306a\u5834\u5408<\/h4>\n\n\n
\ndata = undefined\ndata = ApiServer : Fri Jul 18 2025 23:57:37 GMT+0900 (\u65e5\u672c\u6a19\u6e96\u6642)\n\u30ad\u30fc\u3092\u5909\u66f4\u30dc\u30bf\u30f3\u304c\u62bc\u4e0b\u3055\u308c\u307e\u3057\u305f\ndata = ApiServer : Fri Jul 18 2025 23:57:37 GMT+0900 (\u65e5\u672c\u6a19\u6e96\u6642)\ndata = ApiServer : Fri Jul 18 2025 23:57:42 GMT+0900 (\u65e5\u672c\u6a19\u6e96\u6642)\n<\/pre><\/div>\n\n\n
populateCache\u306e\u52d5\u4f5c\u78ba\u8a8d<\/h2>\n\n\n\n
\u76ee\u7684<\/h3>\n\n\n\n
\u65e2\u306b\u53d6\u5f97\u3057\u305f\u30c7\u30fc\u30bf\u304c\u3042\u308b\u72b6\u614b\u3067\u3001populateCache\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u8a2d\u5b9a\u3057\u3066mutate\u3059\u308b\u3002<\/p>\n\n\n\n
\u65e2\u5b58\u306e\u30c7\u30fc\u30bf\u3068API\u304b\u3089\u53d6\u5f97\u3057\u305f\u30c7\u30fc\u30bf\u304c\u540c\u3058\u3067\u3042\u308c\u3070\u4f55\u3082\u3057\u306a\u3044\u3002<\/p>\n\n\n\n
\u65e2\u5b58\u306e\u30c7\u30fc\u30bf\u3068API\u304b\u3089\u53d6\u5f97\u3057\u305f\u30c7\u30fc\u30bf\u304c\u9055\u3063\u3066\u3044\u308c\u3070\u3001
\u4f55\u3089\u304b\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u30e6\u30fc\u30b6\u306b\u8868\u793a\u3057\u3001
Yes\u304c\u9078\u629e\u3055\u308c\u305f\u3089\u66f4\u65b0\u3057\u3001No\u304c\u9078\u629e\u3055\u308c\u305f\u3089\u66f4\u65b0\u3057\u306a\u3044\u3001\u3068\u3044\u3046\u51e6\u7406\u3092\u5b9f\u73fe\u3057\u305f\u3044\u3002<\/p>\n\n\n\n
\u7d50\u679c<\/h3>\n\n\n\n
\u5b9f\u969b\u306b\u306f\u30e2\u30fc\u30c0\u30eb\u3084\u30dc\u30bf\u30f3\u3092\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5316\u3059\u308b\u3060\u308d\u3046\u3051\u3069\u3001\u3068\u308a\u3042\u3048\u305a\u3067\u304d\u305f\u3002<\/p>\n\n\n\n
Express\u3092\u5229\u7528\u3057\u305f\u7c21\u6613API\u30b5\u30fc\u30d0<\/h3>\n\n\n\n
POST\u3067JSON\u3092\u53d7\u3051\u53d6\u308b\u3002<\/p>\n\n\n\n
{testName: ‘useSWR’}\u3068\u3044\u3046JSON\u3092\u53d7\u3051\u53d6\u3063\u305f\u3089\u3001\u6642\u9593\u3092\u8fd4\u3059\u3002<\/p>\n\n\n\n
{testName: ‘mutate1’}\u3068\u3044\u3046JSON\u3092\u53d7\u3051\u53d6\u3063\u305f\u3089\u3001mutate1\u306e\u6587\u5b57\u5217\u3092\u8fd4\u3059\u3002<\/p>\n\n\n\n
{testName: ‘mutate2’}\u3068\u3044\u3046JSON\u3092\u53d7\u3051\u53d6\u3063\u305f\u3089\u3001mutate2\u306e\u6587\u5b57\u5217\u3092\u8fd4\u3059\u3002<\/p>\n\n\n
\nconst express = require('express')\nconst app = express()\nconst port = 3001\n\n\nconst allowCrossDomain = function(req, res, next) {\n  res.header('Access-Control-Allow-Origin', '*')\n  res.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE')\n  res.header(\n    'Access-Control-Allow-Headers',\n    'Content-Type, Authorization, access_token'\n  )\n\n  \/\/ intercept OPTIONS method\n  if ('OPTIONS' === req.method) {\n    res.sendStatus(200)\n  } else {\n    next()\n  }\n}\n\n\napp.use(allowCrossDomain)\napp.use(express.urlencoded({ extended: true }))\napp.use(express.json())\n\n\napp.post('\/', (req, res) => {\n  const testName = req.body.testName\n\n  console.log(`testName = ${testName}`)\n\n  if (testName === 'useSWR') {\n    res.send('ApiServer: ' + Date())\n  } else if (testName === 'mutate1') {\n    res.send('mutate1')\n  } else {\n    res.send('mutate2')\n  }\n})\n\n\napp.listen(port, () => {\n  console.log(`Example app listening on port ${port}`)\n})\n<\/pre><\/div>\n\n\n
\u30b3\u30fc\u30c9<\/h3>\n\n\n
\nimport { type ReactNode, useEffect, useState } from 'react'\nimport useSWR, { useSWRConfig } from 'swr'\n\n\nfunction PopulateCache(): ReactNode {\n  \/\/ API\u306eURL\u3002\n  const url: string = 'http:\/\/localhost:3001';\n\n  \/\/ \u521d\u671f\u63cf\u753b\u6642\u7b49\u306b\u5b9f\u884c\u3055\u308c\u308buseSWR\u3002\n  \/\/ \u30b5\u30fc\u30d0\u306b{testName: 'useSWR'}\u3068\u3044\u3046JSON\u304c\u9001\u4fe1\u3055\u308c\u308b\u3002\n  const {data} = useSWR<string>(\n    url,\n    async (url: string): Promise<string> => {\n      const response = await fetch(\n        url,\n        {\n          method: 'POST',\n          headers: {\n            'Content-Type': 'application\/json',\n          },\n          body: JSON.stringify({testName: 'useSWR'}),\n        });\n      return response.text();\n    },\n  );\n\n  \/\/ \u30b0\u30ed\u30fc\u30d0\u30ebmutate\u53d6\u5f97\u3002\n  const {mutate} = useSWRConfig();\n\n  \/\/ \u66f4\u65b0\u53ef\u80fd\u306a\u30c7\u30fc\u30bf\u3092\u683c\u7d0d\u3059\u308bstate\u3067\u3001\u30e2\u30fc\u30c0\u30eb\u8868\u793a\u30fb\u975e\u8868\u793a\u306e\u8996\u899a\u72b6\u614b\u3092\u8868\u3059\u3002\n  const [newData, setNewData] = useState<string|null>(null);\n\n\n  \/\/ mutate(with PopulateCache)\u30dc\u30bf\u30f3\u306e\u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9\u3002\n  function mutateWithPopulateCache(num: number) {\n    \/\/ \u30b5\u30fc\u30d0\u306b{testName: 'mutate+\u6570\u5b57'}\u3068\u3044\u3046JSON\u304c\u9001\u4fe1\u3055\u308c\u308b\u3002\n    mutate(\n      url,\n\n      \/\/ \u3082\u3057\u7b2c1\u5f15\u6570\u304c\u5b58\u5728\u3059\u308c\u3070\u3001\u7b2c1\u5f15\u6570\u306b\u73fe\u5728\u306edata\u306e\u5024\u304c\u5165\u308b\u3002\n      async (): Promise<string> => {\n        const response = await fetch(\n          url,\n          {\n            method: 'POST',\n            headers: {\n              'Content-Type': 'application\/json',\n            },\n            body: JSON.stringify({testName: `mutate${num}`}),\n          });\n        return response.text();\n      },\n\n      {\n        \/\/ mutate\u306e\u7b2c2\u5f15\u6570\u306b\u6307\u5b9a\u3057\u305f\u95a2\u6570\u5b9f\u884c\u5f8c\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u518d\u691c\u8a3c\u306e\u305f\u3081\u306bAPI\u30682\u91cd\u3067\u901a\u4fe1\u3059\u308b\u306e\u3092\u9632\u3050\u3002\n        revalidate: false,\n\n        \/\/ mutate\u306e\u7b2c2\u5f15\u6570\u306b\u6307\u5b9a\u3057\u305f\u95a2\u6570\u5b9f\u884c\u5f8c\u3001\u305d\u306e\u901a\u4fe1\u7d50\u679c\u3068\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u6bd4\u3079\u3066\u66f4\u65b0\u3059\u308b\u51e6\u7406\u3002\n        \/\/ \u7b2c1\u5f15\u6570\u306bmutate\u306e\u7b2c2\u5f15\u6570\u306b\u6307\u5b9a\u3057\u305f\u95a2\u6570\u306e\u623b\u308a\u5024\u304c\u5165\u308a\u3001\u7b2c2\u5f15\u6570\u306b\u30ad\u30e3\u30c3\u30b7\u30e5\u30c7\u30fc\u30bf\u304c\u5165\u308b\u3002\n        populateCache: function (newData: string, oldData: string|undefined): string {\n          console.log('===== populateCache =====');\n          console.log(`newData = ${newData}`);\n          console.log(`oldData = ${oldData}`);\n\n          \/\/ \u66f4\u65b0\u53ef\u80fd\u306a\u30c7\u30fc\u30bf\u304c\u3042\u3063\u305f\u5834\u5408\u3002\n          if (newData !== oldData) {\n            setNewData(newData);\n          }\n\n          return oldData ?? '';\n        },\n      },\n    )\n  }\n\n\n  useEffect(() => {\n    console.log(`data = ${data}`);\n  }, [data]);\n\n\n  useEffect(() => {\n    if (newData !== null) {\n      (document.getElementById('dialog') as HTMLDialogElement).showModal();\n    }\n  }, [newData]);\n\n\n  \/\/ \u30e2\u30fc\u30c0\u30eb\u306e\u300c\u306f\u3044\u300d\u30dc\u30bf\u30f3\u306e\u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9\u3002\n  function handleBtnYes(): void {\n    mutate(url, newData, {revalidate: false});\n    (document.getElementById('dialog') as HTMLDialogElement).close();\n    setNewData(null);\n  }\n\n\n  \/\/ \u30e2\u30fc\u30c0\u30eb\u306e\u300c\u3044\u3044\u3048\u300d\u30dc\u30bf\u30f3\u306e\u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9\u3002\n  function handleBtnNo(): void {\n    (document.getElementById('dialog') as HTMLDialogElement).close();\n    setNewData(null);\n  }\n\n\n  return (\n    <>\n      data = {data}\n      <hr\/>\n\n      <button type={'button'} onClick={() => {\n        mutateWithPopulateCache(1)\n      }}>\n        mutate1(with PopulateCache)\n      <\/button>\n\n      <br\/>\n      <br\/>\n\n      <button type={'button'} onClick={() => {\n        mutateWithPopulateCache(2)\n      }}>\n        mutate2(with PopulateCache)\n      <\/button>\n\n      <dialog id="dialog">\n        <form method="dialog">\n          \u66f4\u65b0\u53ef\u80fd\u306a\u30c7\u30fc\u30bf\u304c\u3042\u308a\u307e\u3059\u3002<br\/>\n          \u66f4\u65b0\u3057\u3066\u3088\u308d\u3057\u3044\u3067\u3059\u304b\uff1f<br\/>\n\n          <button\n            type="button"\n            id="btnYes"\n            onClick={handleBtnYes}\n          >\n            \u306f\u3044\n          <\/button>\n          <br\/>\n\n          <button\n            type="button"\n            id="btnNo"\n            onClick={handleBtnNo}\n          >\n            \u3044\u3044\u3048\n          <\/button>\n        <\/form>\n      <\/dialog>\n    <\/>\n  );\n}\n\nexport default PopulateCache;\n<\/pre><\/div>","protected":false},"excerpt":{"rendered":"
\u74b0\u5883 React\uff1av18.3.1 SWR\uff1av2.2.5 isLoading\u3068isValidating\u306e\u52d5\u4f5c\u78ba\u8a8d\u3067\u306f\u6b21\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u5b9f\u884c\u3057\u305f\u3002 React\uff1av19.1.0 SWR\uff1av2.3.4 \u30a4\u30f3\u30b9\u30c8\u30fc\u30eb \u4e0b\u8a18\u30b3\u30de\u30f3\u30c9\u3092 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[104],"tags":[105],"class_list":["post-1172","post","type-post","status-publish","format-standard","hentry","category-react","tag-react"],"_links":{"self":[{"href":"https:\/\/shinke1987.net\/index.php?rest_route=\/wp\/v2\/posts\/1172","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/shinke1987.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/shinke1987.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/shinke1987.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/shinke1987.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1172"}],"version-history":[{"count":12,"href":"https:\/\/shinke1987.net\/index.php?rest_route=\/wp\/v2\/posts\/1172\/revisions"}],"predecessor-version":[{"id":1350,"href":"https:\/\/shinke1987.net\/index.php?rest_route=\/wp\/v2\/posts\/1172\/revisions\/1350"}],"wp:attachment":[{"href":"https:\/\/shinke1987.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1172"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/shinke1987.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1172"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/shinke1987.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1172"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}