{"id":13474,"date":"2021-05-16T10:50:21","date_gmt":"2021-05-16T01:50:21","guid":{"rendered":"http:\/\/www.code-magagine.com\/?p=13474"},"modified":"2023-09-18T22:52:46","modified_gmt":"2023-09-18T13:52:46","slug":"%e3%80%90next-js%e3%80%91%e3%83%9a%e3%83%bc%e3%82%b8%e9%81%b7%e7%a7%bb%e3%81%ab%e3%81%a4%e3%81%84%e3%81%a6","status":"publish","type":"post","link":"http:\/\/www.code-magagine.com\/?p=13474","title":{"rendered":"\u3010Next.js\u3011Next.js\u306e\u57fa\u672c\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3001\u30da\u30fc\u30b8\u9077\u79fb\u3001\u30da\u30fc\u30b8\u306e\u30c6\u30b9\u30c8"},"content":{"rendered":"\n

\u57fa\u672c\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8<\/h2>\n\n\n\n

Head<\/h3>\n\n\n\n
import Head from 'next\/head';<\/pre>\n\n\n\n
\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u3044\u307e\u3059\u3002\u30bf\u30a4\u30c8\u30eb\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n
<Head>\n  <title>\u30bf\u30a4\u30c8\u30eb<\/title>\n<\/Head><\/pre>\n\n\n\n
App Router\u74b0\u5883<\/h4>\n\n\n\n
Head\u306fmetadata\u306b\u7f6e\u304d\u63db\u308f\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
Link<\/h3>\n\n\n\n
\u30da\u30fc\u30b8\u9077\u79fb\u3092\u5b9f\u73fe\u3067\u304d\u308b\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u3059\u3002prefetch<\/strong><\/span>\u3068\u547c\u3070\u308c\u308b\u4ed5\u7d44\u307f\u3092\u7528\u3044\u3066\u4e8b\u524d\u306b\u30ea\u30f3\u30af\u5148\u306e\u30da\u30fc\u30b8\u60c5\u5831\u3092\u53d6\u5f97\u3057\u3066\u304a\u304f\u3053\u3068\u306b\u3088\u308a\u30da\u30fc\u30b8\u9077\u79fb\u3092\u9ad8\u901f\u5316\u3067\u304d\u308b\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u3059\u3002<\/p>\n\n\n\n
import Link from \"next\/link\";<\/pre>\n\n\n\n
\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
<Link href=\"\/\">\n  <a className=\"link\">\n    Home\n  <\/a>\n<\/Link><\/pre>\n\n\n\n
Image<\/h3>\n\n\n\n
\u753b\u50cf\u306e\u5727\u7e2e\u3092\u6700\u9069\u5316\u3057\u3066\u304f\u308c\u308b\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u3059\u3002\u8868\u793a\u3057\u305f\u3044\u30b5\u30a4\u30ba\u306b\u81ea\u52d5\u3067\u30ea\u30b5\u30a4\u30ba\u3057\u305f\u4e0a\u3067\u306e\u914d\u4fe1\u3084\u9045\u5ef6\u8aad\u307f\u8fbc\u307f\u3092\u5b9f\u73fe\u3067\u304d\u308b\u305f\u3081Web\u30da\u30fc\u30b8\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u5411\u4e0a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
import Image from \"next\/image\";<\/pre>\n\n\n\n
\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
<Image\n  src=\"\/image.jpg\"\n  width={60}\n  height={60}\n  alt=\"image\"\n\/><\/pre>\n\n\n\n
\u3061\u306a\u307f\u306b\u3001\u6bce\u56de\u9055\u3046\u753b\u50cf\u3092\u751f\u6210\u3059\u308b\u3068\u3059\u3050Vercel\u306e\u679a\u6570\u306e\u4e0a\u9650\u306b\u9054\u3059\u308b\u306e\u3067\u6ce8\u610f\u3059\u308b\u3053\u3068\u3002\uff08Pro\u3067\u3082\u4e0a\u96503000\u679a\u306b\u306a\u3063\u3066\u3044\u308b\u3002\uff09<\/p>\n\n\n\n
Next.js\u306epublic\u30d5\u30a9\u30eb\u30c0\u306b\u30ed\u30fc\u30ab\u30eb\u753b\u50cf\u306fNext.js\u304c\u6700\u9069\u5316\u3092\u884c\u3063\u3066\u304f\u308c\u307e\u3059\u304c\u3001\u5225\u306eCDN\u3082\u6307\u5b9a\u306f\u53ef\u80fd\u3067\u3059\u3002\u305d\u306e\u5834\u5408\u306f\u3001loarder\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u4f7f\u3044\u307e\u3059\u3002\u4ee5\u4e0b\u5bfe\u5fdc\u3057\u3066\u3044\u308bCDN\u3054\u3068\u306e\u57cb\u3081\u8fbc\u307f\u65b9\u6cd5\u304c\u8a18\u8f09\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3061\u306a\u307f\u306b\u3001cloudfront\u306f\u5bfe\u5fdc\u3057\u3066\u3044\u306a\u3055\u305d\u3046\u306a\u306e\u3067\u6700\u9069\u5316\u306f\u884c\u3048\u306a\u3044\u3002\uff08\u306a\u306e\u3067\u3001Vercel\u3092\u30c7\u30d7\u30ed\u30a4\u5148\u3092\u6307\u5b9a\u3057\u306a\u3044\u9650\u308a\u306f\u7279\u306b\u6700\u9069\u5316\u3092\u884c\u3046\u5fc5\u8981\u3082\u306a\u3044\u3002\uff09<\/p>\n\n\n\n
https:\/\/nextjs.org\/docs\/app\/api-reference\/next-config-js\/images#example-loader-configuration<\/a><\/p>\n\n\n\n
\u2192\u3082\u3057\u3001\u5c0e\u5165\u3057\u306a\u3044\u306a\u3089\u5225\u9014lazyload\u306f\u691c\u8a0e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002<\/p>\n\n\n\n
\u30ad\u30e3\u30c3\u30b7\u30e5<\/h4>\n\n\n\n
\u30ed\u30fc\u30ab\u30eb\u753b\u50cf\u2192\u30cf\u30c3\u30b7\u30e5\u5024\u304c\u4ed8\u4e0e\u3055\u308c\u3066\u753b\u50cf\u3092\u5dee\u3057\u66ff\u3048\u305f\u5834\u5408\u3067\u3082\u66f4\u65b0\u3057\u3066\u304f\u308c\u308b\u3002<\/p>\n\n\n\n
CDN\u306a\u3069\u306e\u30ea\u30e2\u30fc\u30c8\u753b\u50cf\u2192\u30cf\u30c3\u30b7\u30e5\u5024\u3092\u8a08\u7b97\u3067\u304d\u306a\u3044\u306e\u3067\u3001cache\u306e\u6642\u9593\u3092\u77ed\u3081\u306b\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u304c\u63a8\u5968\u3055\u308c\u3066\u3044\u308b\u304c\u3001\u57fa\u672c\u7684\u306b\u9759\u7684\u30b3\u30f3\u30c6\u30f3\u30c4\u306f\u9577\u3081\u306b\u3057\u305f\u65b9\u304c\u826f\u3044\u3060\u308d\u3046\u3002<\/p>\n\n\n\n
\u30da\u30fc\u30b8\u9077\u79fb\u65b9\u6cd5<\/h2>\n\n\n\n
\u30ea\u30f3\u30af\u5f62\u5f0f\u3067\u30da\u30fc\u30b8\u9077\u79fb\u3092\u3055\u305b\u305f\u3044\u5834\u5408<\/h3>\n\n\n\n
NextJs\u306eLink\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u4f7f\u3046\u3002<\/h4>\n\n\n\n
\u30da\u30fc\u30b8\u9077\u79fb\u3092\u5b9f\u73fe\u3067\u304d\u308b\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u3059\u3002<\/p>\n\n\n\n
import Link from \"next\/link\";<\/pre>\n\n\n\n
\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
<Link href=\"\/\">\n  <a className=\"link\">\n    Home\n  <\/a>\n<\/Link><\/pre>\n\n\n\n
\u95a2\u6570\u306e\u4e2d\u304b\u3089\u30da\u30fc\u30b8\u9077\u79fb\u3092\u3055\u305b\u305f\u3044\u5834\u5408<\/h3>\n\n\n\n
userRouter\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
import { useRouter } from 'next\/router';\n\n  const router = useRouter();\n\nconst kansu = () => {\n  router.push('\/\u9077\u79fb\u5148URL');\n}<\/pre>\n\n\n\n
App Router\u74b0\u5883<\/h4>\n\n\n\n
\u300cnext\/router\u300d\u306f\u300cnext\/navigation\u300d\u306b\u7f6e\u304d\u63db\u308f\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
page\u306e\u30c6\u30b9\u30c8<\/h2>\n\n\n\n
\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb<\/h3>\n\n\n\n
Next.js\u306epage\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306f\u666e\u901a\u306eReact\u306b\u6bd4\u3079\u3066\u5c11\u3057\u7279\u6b8a\u306a\u306e\u3067\u3001\u30c6\u30b9\u30c8\u3059\u308b\u306b\u306f\u300cnext-page-tester\u300d<\/strong><\/span>\u3068\u3044\u3046\u30d1\u30c3\u30b1\u30fc\u30b8\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
npm i next-page-tester<\/pre>\n\n\n\n
\u5b9f\u88c5<\/h3>\n\n\n\n
import { getPage, initTestHelpers } from 'next-page-tester'\n\ninitTestHelpers()\n\ndescribe('\u30c6\u30b9\u30c8\u30b3\u30fc\u30c9', () => {\n  it('\u30c6\u30b9\u30c8\u30b1\u30fc\u30b91', async () => {\n    const { page } = await getPage({\n      route: '\u53d6\u5f97\u3057\u305f\u3044\u30da\u30fc\u30b8\u306e\u30d1\u30b9',\n    })\n    render(page)\n\n    userEvent.click(screen.getByTestId('xxx'))\n    expect(await screen.findByText('yyy')).toBeInTheDocument()\n  }\n}<\/pre>\n\n\n\n
initTestHelpers<\/h4>\n\n\n\n
\u30da\u30fc\u30b8\u30d8\u30eb\u30d1\u30fc\u306e\u521d\u671f\u5316\u3067\u3059\u3002<\/p>\n\n\n\n
\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9<\/h4>\n\n\n\n
\u300cnext-page-tester\u300d\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u306f\u3001\u30da\u30fc\u30b8\u306e\u53d6\u5f97\u304c\u975e\u540c\u671f\u51e6\u7406\u306b\u306a\u308b\u306e\u3067\u95a2\u6570\u3092async<\/strong><\/span>\u306b\u3057\u3066\u304a\u304f\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u57fa\u672c\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8 Head import Head from 'next\/head'; \u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u3044\u307e\u3059\u3002\u30bf\u30a4\u30c8\u30eb\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002 <Head> <title>\u30bf\u30a4\u30c8\u30eb<\/title& […]","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[119],"tags":[],"_links":{"self":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/13474"}],"collection":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=13474"}],"version-history":[{"count":14,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/13474\/revisions"}],"predecessor-version":[{"id":22999,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/13474\/revisions\/22999"}],"wp:attachment":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=13474"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=13474"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=13474"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}