{"id":58529,"date":"2024-07-05T16:33:04","date_gmt":"2024-07-05T07:33:04","guid":{"rendered":"https:\/\/kinsta.com\/jp\/?p=58529&#038;preview=true&#038;preview_id=58529"},"modified":"2024-07-10T15:09:10","modified_gmt":"2024-07-10T06:09:10","slug":"react-19-wordpress","status":"publish","type":"post","link":"https:\/\/kinsta.com\/jp\/blog\/react-19-wordpress\/","title":{"rendered":"React 19\u306e\u5909\u66f4\u70b9\u3068\u5bfe\u5fdc\u65b9\u6cd5\uff08WordPress 6.6\u5229\u7528\u8005\u5411\u3051\uff09"},"content":{"rendered":"<p><a href=\"https:\/\/kinsta.com\/jp\/blog\/hire-wordpress-developer\/\">WordPress\u958b\u767a<\/a>\u3067\u306f\u3001\u72ec\u81ea\u306e<a href=\"https:\/\/kinsta.com\/jp\/blog\/what-is-react-js\/\">React<\/a>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092<a href=\"https:\/\/kinsta.com\/jp\/blog\/fastest-wordpress-theme\/\">\u30c6\u30fc\u30de<\/a>\u3084<a href=\"https:\/\/kinsta.com\/jp\/topics\/wordpress-plugins\/\">\u30d7\u30e9\u30b0\u30a4\u30f3<\/a>\u306b\u7d71\u5408\u3057\u3001\u52d5\u7684\u3067\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u306a\u30e6\u30fc\u30b6\u30fc\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p><a href=\"https:\/\/react.dev\/blog\/2024\/04\/25\/react-19\" target=\"_blank\" rel=\"noopener noreferrer\">React 19\u306e\u30ea\u30ea\u30fc\u30b9<\/a>\u304c\u9593\u8fd1\u306b\u8feb\u308b\u4eca\u3001\u65e2\u5b58\u306e\u30b3\u30fc\u30c9\u30d9\u30fc\u30b9\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u53ef\u80fd\u6027\u306e\u3042\u308b\u65b0\u6a5f\u80fd\u3084\u975e\u63a8\u5968\u306e\u5909\u66f4\u306b\u5099\u3048\u3066\u304a\u304f\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u30027\u670816\u65e5\u306b\u30ea\u30ea\u30fc\u30b9\u4e88\u5b9a\u306e<a href=\"https:\/\/kinsta.com\/jp\/blog\/wordpress-6-6\/\">WordPress 6.6<\/a>\u306b\u306f\u3001React 18.3\u304c\u5c0e\u5165\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u306f18.2\u3068\u307b\u307c\u540c\u3058\u306b\u306a\u308a\u307e\u3059\u304c\u3001React 19\u30ea\u30ea\u30fc\u30b9\u306b\u5411\u3051\u305f\u975e\u63a8\u5968\u306e\u6a5f\u80fd\u306b\u5bfe\u3059\u308b\u8b66\u544a\u304c\u8ffd\u52a0\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u975e\u63a8\u5968\u3068\u306a\u308b\u6a5f\u80fd\u3078\u306e\u5bfe\u51e6\u306f\u3001React 19\u3068\u306e\u4e92\u63db\u6027\u3092\u78ba\u4fdd\u3059\u308b\u305f\u3081\u306b\u4e0d\u53ef\u6b20\u3067\u3059\u3002\u5bfe\u51e6\u3092\u6020\u308b\u3068\u3001React 19\u304c\u30ea\u30ea\u30fc\u30b9\u3055\u308cWordPress\u306b\u7d44\u307f\u8fbc\u307e\u308c\u305f\u969b\u306b\u3001<a href=\"https:\/\/kinsta.com\/jp\/blog\/gutenberg-blocks\/\">\u30ab\u30b9\u30bf\u30e0\u30d6\u30ed\u30c3\u30af<\/a>\u3084\u30d7\u30e9\u30b0\u30a4\u30f3\u3001<a href=\"https:\/\/kinsta.com\/jp\/blog\/wordpress-react-theme\/\">\u30c6\u30fc\u30de<\/a>\u306b\u30d0\u30b0\u3084\u554f\u984c\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u305d\u3053\u3067\u4eca\u56de\u306f\u3001\u975e\u63a8\u5968\u3068\u306a\u308b\u6a5f\u80fd\u306e\u6982\u8981\u3068\u30b3\u30fc\u30c9\u4f8b\u3001\u6a5f\u80fd\u3092\u30b7\u30fc\u30e0\u30ec\u30b9\u306b\u7dad\u6301\u3059\u308b\u305f\u3081\u306b\u975e\u63a8\u5968\u6a5f\u80fd\u3092\u7f6e\u304d\u63db\u3048\u308b\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<aside role=\"note\" class=\"wp-block-kinsta-notice is-style-info\">\n            <h3>Info<\/h3>\n        <p>React\u30c1\u30fc\u30e0\u306f\u3001\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u652f\u63f4\u306e\u305f\u3081<a href=\"http:\/\/codemod.com\" target=\"_blank\" rel=\"noopener noreferrer\">Codemod<\/a>\u3068\u5354\u529b\u3057\u3001React 19\u306e\u591a\u304f\u306eAPI\u3084\u30d1\u30bf\u30fc\u30f3\u306b\u30b3\u30fc\u30c9\u3092\u81ea\u52d5\u66f4\u65b0\u3059\u308bcodemod\uff08\u30b3\u30fc\u30c9\u5909\u63db\uff09\u3092\u516c\u958b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3059\u3079\u3066\u306e\u30b3\u30fc\u30c9\u306fGitHub\u306e<a href=\"https:\/\/github.com\/reactjs\/react-codemod\" target=\"_blank\" rel=\"noopener noreferrer\">react-codemod\u30ea\u30dd\u30b8\u30c8\u30ea<\/a>\u3067\u5165\u624b\u53ef\u80fd\u3067\u3059\u3002\u307e\u305f\u3001\u30b3\u30fc\u30c9\u306e\u81ea\u52d5\u66f4\u65b0\u3092\u3088\u308a\u30b9\u30e0\u30fc\u30ba\u306b\u884c\u3048\u308b\u3088\u3046\u3001\u672c\u8a18\u4e8b\u5185\u3067\u5404\u975e\u63a8\u5968\u306ecodemod\u30b3\u30de\u30f3\u30c9\u3082\u3054\u7d39\u4ecb\u3057\u307e\u3059\uff08\u5229\u7528\u53ef\u80fd\u306a\u5834\u5408\uff09\u3002<\/p>\n<\/aside>\n\n<div><\/div><kinsta-auto-toc heading=\"Table of Contents\" exclude=\"last\" list-style=\"arrow\" selector=\"h2\" count-number=\"-1\"><\/kinsta-auto-toc>\n<h2>React\u3067\u524a\u9664\u3055\u308c\u308b\u975e\u63a8\u5968\u6a5f\u80fd<\/h2>\n<p>React\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u52b9\u7387\u5316\u3057\u3001\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u4fc3\u9032\u3059\u308b\u76ee\u7684\u3067\u3001\u4e00\u90e8\u975e\u63a8\u5968API\u3068\u6a5f\u80fd\u304c\u524a\u9664\u3055\u308c\u307e\u3057\u305f\u3002\u4ee5\u4e0b\u4e3b\u306a\u5909\u66f4\u70b9\u3001\u304a\u3088\u3073\u30b3\u30fc\u30c9\u66f4\u65b0\u65b9\u6cd5\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h3>1. \u95a2\u6570\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8defaultProps\u306e\u524a\u9664<\/h3>\n<p>React 19\u3067\u306f\u3001\u95a2\u6570\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e<code>defaultProps<\/code>\u304c\u524a\u9664\u3055\u308c\u3001<a href=\"https:\/\/kinsta.com\/jp\/blog\/javascript-react\/\">ES6<\/a>\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u30d1\u30e9\u30e1\u30fc\u30bf\u304c\u63a1\u7528\u3055\u308c\u307e\u3059\u3002<a href=\"https:\/\/make.wordpress.org\/core\/2024\/06\/07\/preparation-for-react-19-upgrade\/\" target=\"_blank\" rel=\"noopener noreferrer\">WordPress\u30c1\u30fc\u30e0\u306b\u3088\u308b\u3068<\/a>\u3001\u3053\u306e\u975e\u63a8\u5968\u95a2\u6570\u306f\u30d7\u30e9\u30b0\u30a4\u30f3\u3084\u30c6\u30fc\u30de\u3067\u6700\u3082\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u4e2d\u306b\u306f\u3001<code>defaultProps<\/code>\u3092\u4f7f\u3063\u3066\u95a2\u6570\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306eprops\u306b\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3092\u63d0\u4f9b\u3057\u3001\u7279\u5b9a\u306eprops\u304c\u6e21\u3055\u308c\u306a\u304f\u3066\u3082\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u6b63\u3057\u304f\u52d5\u4f5c\u3059\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u308bWordPress\u958b\u767a\u8005\u3082\u3044\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n<p>\u4ee5\u4e0b\u306f\u3001<code>defaultProps<\/code>\u3092\u4f7f\u7528\u3057\u305f\u73fe\u5728\u306e\u30b3\u30fc\u30c9\u306e\u4f8b\u3067\u3059\u3002<\/p>\n<pre><code class=\"language-jsx\">function CustomButton({ label, color }) {\n    return &lt;button style={{ backgroundColor: color }}&gt;{ label }&lt;\/button&gt;;\n}\n\nCustomButton.defaultProps = {\n    label: '\u30af\u30ea\u30c3\u30af',\n    color: 'blue',\n};<\/code><\/pre>\n<p><code>CustomButton<\/code>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306f\u3001<code>defaultProps<\/code>\u306b\u3088\u308b\u30c7\u30d5\u30a9\u30eb\u30c8\u306e<code>label<\/code>\u3068<code>color<\/code>\u5024\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002React 19\u3067\u306f\u8b66\u544a\u30a8\u30e9\u30fc\u304c\u6295\u3052\u3089\u308c\u3001ES6\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u4ee3\u308f\u308a\u306b\u4f7f\u7528\u3059\u308b\u3088\u3046\u306b\u4fc3\u3057\u307e\u3059\u3002<\/p>\n<p>ES6\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u4f7f\u3063\u3066\u66f4\u65b0\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-jsx\">function CustomButton({ label = '\u30af\u30ea\u30c3\u30af', color = 'blue' }) {\n    return &lt;button style={{ backgroundColor: color }}&gt;{ label }&lt;\/button&gt;;\n}<\/code><\/pre>\n<p>ES6\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u304c\u95a2\u6570\u306e\u30b7\u30b0\u30cd\u30c1\u30e3\u306b\u76f4\u63a5\u8a18\u8ff0\u3055\u308c\u308b\u305f\u3081\u30b3\u30fc\u30c9\u304c\u8aad\u307f\u3084\u3059\u304f\u306a\u308a\u3001\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u3082\u5bb9\u6613\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3>2. \u95a2\u6570\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8propTypes\u306e\u524a\u9664<\/h3>\n<p><code>propTypes<\/code>\u306f<a href=\"https:\/\/legacy.reactjs.org\/blog\/2017\/04\/07\/react-v15.5.0.html#new-deprecation-warnings\" target=\"_blank\" rel=\"noopener noreferrer\">React 15.5.0\u3067\u975e\u63a8\u5968<\/a>\u3068\u306a\u308a\u3001React 19\u3067\u5b8c\u5168\u306b\u524a\u9664\u3055\u308c\u308b\u4e88\u5b9a\u3067\u3059\u3002<code>propTypes<\/code>\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u3001<a href=\"https:\/\/kinsta.com\/jp\/blog\/what-is-typescript\/\">TypeScript<\/a>\u307e\u305f\u306f\u5225\u306e\u578b\u30c1\u30a7\u30c3\u30af\u306e\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u306b\u79fb\u884c\u3059\u308b\u3053\u3068\u304c\u63a8\u5968\u3055\u308c\u307e\u3059\u3002<\/p>\n<p><code>propTypes<\/code>\u306f\u3001\u305f\u3068\u3048\u3070\u95a2\u6570\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u6e21\u3055\u308c\u308bprop\u304c\u6b63\u3057\u3044\u578b\u3068\u5024\u3067\u3042\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-jsx\">import PropTypes from 'prop-types';\n\nfunction CustomButton({ label, color }) {\n    return &lt;button style={{ backgroundColor: color }}&gt;{ label }&lt;\/button&gt;;\n}\n\nCustomButton.defaultProps = {\n    label: '\u30af\u30ea\u30c3\u30af',\n    color: 'blue',\n};\n\nCustomButton.propTypes = {\n    label: PropTypes.string,\n    color: PropTypes.string,\n};<\/code><\/pre>\n<p>\u4eca\u5f8c\u306f\u3001TypeScript\u3092\u4f7f\u7528\u3057\u3066\u578b\u30c1\u30a7\u30c3\u30af\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-jsx\">type CustomButtonProps = {\n    label?: string;\n    color?: string;\n};\n\nconst CustomButton = ({ label = '\u30af\u30ea\u30c3\u30af', color = 'blue' }: CustomButtonProps) =&gt; {\n    return &lt;button style={{ backgroundColor: color }}&gt;{ label }&lt;\/button&gt;;\n};<\/code><\/pre>\n<aside role=\"note\" class=\"wp-block-kinsta-notice is-style-info\">\n            <h3>Info<\/h3>\n        <p><code>propTypes<\/code>\u304b\u3089TypeScript\u306b\u5207\u308a\u66ff\u3048\u308b\u306b\u306f\u3001\u4ee5\u4e0b\u306ecodemod\u30b3\u30de\u30f3\u30c9\u304c\u4fbf\u5229\u3067\u3059\u3002<\/p>\n<pre><code class=\"language-bash\">npx codemod@latest react\/prop-types-typescript<\/code><\/pre>\n<p><\/p>\n<\/aside>\n\n<h3>3. \u30ec\u30ac\u30b7\u30fc\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\uff08contextTypes\u3068getChildContext\uff09\u306e\u524a\u9664<\/h3>\n<p>WordPress\u306e\u591a\u304f\u306e\u30d7\u30e9\u30b0\u30a4\u30f3\u3084\u30b3\u30fc\u30c9\u30d9\u30fc\u30b9\u3067\u9577\u5e74\u306b\u308f\u305f\u3063\u3066\u4f7f\u7528\u3055\u308c\u3066\u304d\u305f\u3053\u3068\u304b\u3089\u3001\u30af\u30e9\u30b9\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067<code>contextTypes<\/code> \u3084<code>getChildContext<\/code>\u3068\u3044\u3063\u305f\u65e7\u5f0f\u306eAPI\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u3053\u308c\u3089\u306eAPI\u306f\u3001\u5404\u30ec\u30d9\u30eb\u3067\u660e\u793a\u7684\u306bprops\u3092\u6e21\u3059\u3053\u3068\u306a\u304f\u3001\u89aa\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304b\u3089\u305d\u306e\u5b50\u5b6b\u306b\u30c7\u30fc\u30bf\u3092\u6e21\u3059\u305f\u3081\u306b\u4f7f\u7528\u3059\u308b\u306e\u304c\u4e00\u822c\u7684\u3067\u3057\u305f\u3002<\/p>\n<p>\u898b\u843d\u3068\u3055\u308c\u304c\u3061\u306a\u7d30\u304b\u306a\u30d0\u30b0\u306b\u3088\u308a\u3001\u3053\u306e\u30ec\u30ac\u30b7\u30fc\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u306f<a href=\"https:\/\/legacy.reactjs.org\/blog\/2018\/10\/23\/react-v-16-6.html\" target=\"_blank\" rel=\"noopener noreferrer\">React 16.6.0\u3067\u975e\u63a8\u5968<\/a>\u3068\u306a\u308a\u3001React 19\u3067\u5b8c\u5168\u306b\u524a\u9664\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u4eca\u5f8c\u306f\u3001<code>contextType<\/code> API\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>WordPress\u30d7\u30e9\u30b0\u30a4\u30f3\u3067\u975e\u63a8\u5968\u306eContext API\u3092\u4f7f\u7528\u3057\u3001\u30b5\u30a4\u30c8\u30bf\u30a4\u30c8\u30eb\u306a\u3069\u306e\u30b0\u30ed\u30fc\u30d0\u30eb\u8a2d\u5b9a\u3092\u89aa\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304b\u3089\u5b50\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306bprop drilling\uff08\u30d0\u30b1\u30c4\u30ea\u30ec\u30fc\uff09\u3092\u56de\u907f\u3057\u3066\u6e21\u3059\u4f8b\u3092\u898b\u3066\u307f\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-jsx\">import PropTypes from 'prop-types';\n\nclass SettingsProvider extends React.Component {\n  static childContextTypes = {\n    siteTitle: PropTypes.string.isRequired,\n  };\n\n  getChildContext() {\n    return { siteTitle: '\u79c1\u306eWordPress\u30b5\u30a4\u30c8' };\n  }\n\n  render() {\n    return &lt;SettingsConsumer \/&gt;;\n  }\n}\n\nclass SettingsConsumer extends React.Component {\n  static contextTypes = {\n    siteTitle: PropTypes.string.isRequired,\n  };\n\n  render() {\n    return &lt;div&gt;\u30b5\u30a4\u30c8\u30bf\u30a4\u30c8\u30eb: {this.context.siteTitle}&lt;\/div&gt;;\n  }\n}<\/code><\/pre>\n<p>\u4eca\u5f8c\u306fReact 19\u3078\u306e\u5099\u3048\u3068\u3057\u3066\u3001<code>createContext<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-jsx\">import React from 'react';\n\nconst SettingsContext = React.createContext();\n\nclass SettingsProvider extends React.Component {\n  render() {\n    return (\n      &lt;SettingsContext value={{ siteTitle: '\u79c1\u306eWordPress\u30b5\u30a4\u30c8' }}&gt;\n        &lt;SettingsConsumer \/&gt;\n      &lt;\/SettingsContext&gt;\n    );\n  }\n}\n\nclass SettingsConsumer extends React.Component {\n  static contextType = SettingsContext;\n\n  render() {\n    const { siteTitle } = this.context;\n    return &lt;div&gt;\u30b5\u30a4\u30c8\u30bf\u30a4\u30c8\u30eb: { siteTitle }&lt;\/div&gt;;\n  }\n}<\/code><\/pre>\n<h3>4. \u6587\u5b57\u5217\u5f62\u5f0fref\u306e\u524a\u9664<\/h3>\n<p>\u6587\u5b57\u5217\u5f62\u5f0f\u306e\u53c2\u7167\u306f\u3001\u304b\u3064\u3066React\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067DOM\u8981\u7d20\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u4e00\u822c\u7684\u306a\u65b9\u6cd5\u3067\u3057\u305f\u304c\u3001<a href=\"https:\/\/legacy.reactjs.org\/blog\/2018\/03\/27\/update-on-async-rendering.html\" target=\"_blank\" rel=\"noopener noreferrer\">React 16.3.0\u3067\u975e\u63a8\u5968<\/a>\u3068\u306a\u308a\u3001React 19\u3067\u306f\u524a\u9664\u3055\u308c\u308b\u4e88\u5b9a\u3067\u3059\u3002<\/p>\n<p>\u6587\u5b57\u5217\u3092\u4f7f\u3063\u305f\u53c2\u7167\u306f\u5bb9\u6613\u3067\u3057\u305f\u304c\u3001\u540d\u524d\u304c\u885d\u7a81\u3059\u308b\u53ef\u80fd\u6027\u3084\u67d4\u8edf\u6027\u306e\u6b20\u5982\u306a\u3069\u3001<a href=\"https:\/\/github.com\/facebook\/react\/issues\/1373\" target=\"_blank\" rel=\"noopener noreferrer\">\u3044\u304f\u3064\u304b\u306e\u554f\u984c<\/a>\u304c\u3042\u308a\u307e\u3057\u305f\u3002<\/p>\n<p>WordPress\u306e\u30ab\u30b9\u30bf\u30e0\u30d6\u30ed\u30c3\u30af\u3067\u6587\u5b57\u5217\u3092\u4f7f\u3063\u305f\u53c2\u7167\u3092\u884c\u3046\u3068\u3057\u307e\u3059\u3002\u5165\u529b\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u542b\u3080Gutenberg\u306e\u30ab\u30b9\u30bf\u30e0\u30d6\u30ed\u30c3\u30af\u304c\u3042\u308a\u3001\u30a8\u30c7\u30a3\u30bf\u30fc\u306b\u30d6\u30ed\u30c3\u30af\u304c\u8ffd\u52a0\u3055\u308c\u305f\u969b\u306b\u5165\u529b\u30d5\u30a3\u30fc\u30eb\u30c9\u304c\u81ea\u52d5\u7684\u306b\u76ee\u7acb\u3064\u3088\u3046\u306b\u3057\u305f\u3044\u5834\u5408\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-jsx\">class CustomBlock extends React.Component {\n  componentDidMount() {\n    this.refs.input.focus();\n  }\n\n  render() {\n    return &lt;input ref=\"input\" placeholder=\"\u30c6\u30ad\u30b9\u30c8\u3092\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\" \/&gt;;\n  }\n}<\/code><\/pre>\n<p>React 19\u306b\u5099\u3048\u308b\u306b\u306f\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u5f62\u5f0f\u306e<code>refs<\/code> \u3001\u307e\u305f\u306f<code>React.createRef<\/code> API\u306b\u7f6e\u304d\u63db\u3048\u307e\u3059\u3002\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u5f62\u5f0f\u306e<code>ref<\/code>\u3092\u4f7f\u7528\u3059\u308b\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-jsx\">class CustomBlock extends React.Component {\n  componentDidMount() {\n    this.input.focus();\n  }\n\n  render() {\n    return &lt;input ref={(input) =&gt; (this.input = input)} placeholder=\"\u30c6\u30ad\u30b9\u30c8\u3092\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\" \/&gt;;\n  }\n}<\/code><\/pre>\n<aside role=\"note\" class=\"wp-block-kinsta-notice is-style-info\">\n            <h3>Info<\/h3>\n        <p>\u6587\u5b57\u5217\u5f62\u5f0f\u3092\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u5f62\u5f0f\u306e<code>ref<\/code>\u306b\u5207\u308a\u66ff\u3048\u308b\u306b\u306f\u3001\u4ee5\u4e0b\u306ecodemod\u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre><code class=\"language-bash\">npx codemod@latest react\/19\/replace-string-ref<\/code><\/pre>\n<p><\/p>\n<\/aside>\n\n<h3>5. \u30e2\u30b8\u30e5\u30fc\u30eb\u30d1\u30bf\u30fc\u30f3\u30d5\u30a1\u30af\u30c8\u30ea\u306e\u524a\u9664<\/h3>\n<p>React 19\u3067\u524a\u9664\u3055\u308c\u308b\u3082\u30461\u3064\u306e<a href=\"https:\/\/legacy.reactjs.org\/blog\/2019\/08\/08\/react-v16.9.0.html#deprecating-module-pattern-factories\" target=\"_blank\" rel=\"noopener noreferrer\">\u975e\u63a8\u5968\u6a5f\u80fd<\/a>\u306f\u3001\u30e2\u30b8\u30e5\u30fc\u30eb\u30d1\u30bf\u30fc\u30f3\u30d5\u30a1\u30af\u30c8\u30ea\u3067\u3059\u3002\u3053\u308c\u306f\u73fe\u5728\u307b\u3068\u3093\u3069\u4f7f\u7528\u3055\u308c\u3066\u304a\u3089\u305a\u3001React\u304c\u5fc5\u8981\u4ee5\u4e0a\u306b\u91cd\u304f\u306a\u308a\u3001\u9045\u304f\u306a\u308b\u539f\u56e0\u3068\u306a\u3063\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n<p>\u30e2\u30b8\u30e5\u30fc\u30eb\u30d1\u30bf\u30fc\u30f3\u30d5\u30a1\u30af\u30c8\u30ea\u306e\u4f7f\u7528\u306b\u306f\u3001\u6163\u7fd2\u7684\u3067\u306a\u3044\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u4f5c\u6210\u3067\u304d\u308b\u3068\u3044\u3046\u30e1\u30ea\u30c3\u30c8\u304c\u3042\u308a\u307e\u3057\u305f\u3002<\/p>\n<pre><code class=\"language-jsx\">function SettingsPanelFactory() {\n  return {\n    render() {\n      return (\n        &lt;div className=\"settings-panel\"&gt;\n          &lt;h2&gt;\u8a2d\u5b9a&lt;\/h2&gt;\n          {\/* \u305d\u306e\u4ed6\u306e\u8a2d\u5b9a UI\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8 *\/}\n        &lt;\/div&gt;\n      );\n    }\n  };\n}<\/code><\/pre>\n<p>\u3053\u306e\u30d1\u30bf\u30fc\u30f3\u3067\u306f\u3001<code>SettingsPanelFactory<\/code>\u306fJSX\u3092\u76f4\u63a5\u8fd4\u3059\u306e\u3067\u306f\u306a\u304f\u3001<code>render<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<p>React 19\u306b\u5bfe\u5fdc\u3059\u308b\u306b\u306f\u3001\u3053\u306e\u30e2\u30b8\u30e5\u30fc\u30eb\u30d1\u30bf\u30fc\u30f3\u30d5\u30a1\u30af\u30c8\u30ea\u3092\u3001JSX\u3092\u76f4\u63a5\u8fd4\u3059\u901a\u5e38\u306e\u95a2\u6570\u306b\u79fb\u884c\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-jsx\">function SettingsPanel() {\n  return (\n    &lt;div className=\"settings-panel\"&gt;\n      &lt;h2&gt;\u3000\u8a2d\u5b9a&lt;\/h2&gt;\n      {\/* \u305d\u306e\u4ed6\u306e\u8a2d\u5b9a UI\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8 *\/}\n    &lt;\/div&gt;\n  );\n}<\/code><\/pre>\n<h3>6. createFactory API\u306e\u524a\u9664<\/h3>\n<p>React 19\u3067\u306f\u3001<code>React.createFactory<\/code>\u3082\u524a\u9664\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001<a href=\"https:\/\/kinsta.com\/jp\/blog\/what-is-jsx\/\">JSX<\/a>\u304c\u5e83\u304f\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u308b\u524d\u307e\u3067\u3088\u304f\u4f7f\u7528\u3055\u308c\u3066\u304a\u308a\u3001JSX\u69cb\u6587\u3092\u4f7f\u308f\u305a\u306bReact\u8981\u7d20\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n<p>JSX\u306e\u666e\u53ca\u306b\u4f34\u3044\u3001<code>createFactory<\/code>\u306f\u5f90\u3005\u306b\u65e7\u5f0f\u306e\u30e1\u30bd\u30c3\u30c9\u3068\u306a\u308a\u3001\u3088\u308a\u30b7\u30f3\u30d7\u30eb\u3067\u8aad\u307f\u3084\u3059\u3044JSX\u30b3\u30fc\u30c9\u306b\u7f6e\u304d\u63db\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<p>\u4ee5\u4e0b\u306f\u3001<code>createFactory<\/code>\u3092\u4f7f\u7528\u3057\u3066<code>button<\/code>\u8981\u7d20\u3092\u4f5c\u6210\u3059\u308b\u4f8b\u3067\u3059\u3002<code>button<\/code>\u8981\u7d20\u3092\u30e6\u30fc\u30b6\u30fc\u306e\u5165\u529b\u306b\u57fa\u3065\u3044\u3066\u52d5\u7684\u306b\u751f\u6210\u3059\u308bWordPress\u30d7\u30e9\u30b0\u30a4\u30f3\u306e\u958b\u767a\u306a\u3069\u3067\u898b\u3089\u308c\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-jsx\">import { createFactory } from 'react';\n\nconst button = createFactory('button');\n\nfunction CustomButton() {\n  return button({ className: 'custom-button', type: 'button' }, '\u30af\u30ea\u30c3\u30af');\n}<\/code><\/pre>\n<p>\u3053\u306e\u30b3\u30fc\u30c9\u3092React 19\u306b\u5bfe\u5fdc\u3055\u305b\u308b\u306b\u306f<code>createFactory<\/code>\u3092JSX\u306b\u7f6e\u304d\u63db\u3048\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u30b3\u30fc\u30c9\u304c\u6d17\u7df4\u3055\u308c\u8aad\u307f\u3084\u3059\u304f\u306a\u308a\u3001\u4fdd\u5b88\u7ba1\u7406\u3082\u7c21\u5358\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-jsx\">function CustomButton() {\n  return &lt;button className=\"custom-button\" type=\"button\"&gt;\u30af\u30ea\u30c3\u30af&lt;\/button&gt;;\n}<\/code><\/pre>\n<h3>7. react-test-renderer\/shallow\u306e\u524a\u9664<\/h3>\n<p>React 19\u3067\u306f<code>react-test-renderer\/shallow<\/code>\u304c\u524a\u9664\u3055\u308c\u3001\u3053\u308c\u306b\u3088\u308a\u30c6\u30b9\u30c8\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u304c\u52b9\u7387\u5316\u3055\u308c\u3001\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u304c\u4fc3\u9032\u3055\u308c\u307e\u3059\u3002React 18\u3067\u306f\u3001<code>react-test-renderer\/shallow<\/code>\u304c\u66f4\u65b0\u3055\u308c\u3001<code><a href=\"https:\/\/github.com\/enzymejs\/react-shallow-renderer\" target=\"_blank\" rel=\"noopener noreferrer\">react-shallow-renderer<\/a><\/code>\u304c\u518d\u30a8\u30af\u30b9\u30dd\u30fc\u30c8\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n<p>\u305f\u3068\u3048\u3070\u3001<code>react-test-renderer\/shallow<\/code>\u3092\u4f7f\u7528\u3057\u3066React\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306eshallow\uff08\u6d45\u3044\uff09\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306e\u30c6\u30b9\u30c8\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n<pre><code class=\"language-js\">import ShallowRenderer from 'react-test-renderer\/shallow';\n\ntest('MyComponent shallow render', () =&gt; {\n  const renderer = new ShallowRenderer();\n  renderer.render(&lt;MyComponent \/&gt;);\n  const result = renderer.getRenderOutput();\n  expect(result.type).toBe('div');\n});<\/code><\/pre>\n<p>React 19\u306b\u5bfe\u5fdc\u3059\u308b\u306b\u306f\u3001<code><a href=\"https:\/\/www.npmjs.com\/package\/react-shallow-renderer\" target=\"_blank\" rel=\"noopener noreferrer\">react-shallow-renderer<\/a><\/code>\u306e\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<pre><code class=\"language-bash\">npm install react-shallow-renderer --save-dev<\/code><\/pre>\n<p>\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u5f8c\u3001\u30a4\u30f3\u30dd\u30fc\u30c8\u3092\u66f4\u65b0\u3057\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-js\">import ShallowRenderer from 'react-shallow-renderer';\n\ntest('MyComponent shallow render', () =&gt; {\n  const renderer = new ShallowRenderer();\n  renderer.render(&lt;MyComponent \/&gt;);\n  const result = renderer.getRenderOutput();\n  expect(result.type).toBe('div');\n});<\/code><\/pre>\n<p>React\u306f\u3001<a href=\"https:\/\/testing-library.com\/docs\/react-testing-library\/intro\/\" target=\"_blank\" rel=\"noopener noreferrer\">React Testing Library<\/a>\u3078\u306e\u79fb\u884c\u3092\u63a8\u5968\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u30e9\u30a4\u30d6\u30e9\u30ea\u306b\u3088\u308a\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3068\u3069\u306e\u3088\u3046\u306b\u3084\u308a\u53d6\u308a\u3059\u308b\u304b\u306b\u7126\u70b9\u3092\u5f53\u3066\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u5805\u7262\u306a\u30c6\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u304c\u5b9f\u73fe\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u3092\u884c\u3046\u306b\u306f\u3001<code><a href=\"https:\/\/www.npmjs.com\/package\/@testing-library\/react\" target=\"_blank\" rel=\"noopener noreferrer\">@testing-library\/react<\/a><\/code>\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u958b\u767a\u7528\u306e\u4f9d\u5b58\u95a2\u4fc2\u3068\u3057\u3066\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-bash\">npm install @testing-library\/react --save-dev<\/code><\/pre>\n<p>\u305d\u306e\u5f8c\u3001\u540c\u3058\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u30c6\u30b9\u30c8\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-js\">import { render, screen } from '@testing-library\/react';\nimport MyBlock from '.\/MyBlock';\n\ntest('MyBlock renders correctly', () =&gt; {\n  render(&lt;MyBlock \/&gt;);\n  const element = screen.getByText('MyBlock content');\n  expect(element).toBeInTheDocument();\n});<\/code><\/pre>\n<h2>React DOM\u3067\u524a\u9664\u3055\u308c\u308b\u975e\u63a8\u5968\u30e1\u30bd\u30c3\u30c9<\/h2>\n<p>React 19\u3067\u306fReact DOM\u304c\u5909\u66f4\u3055\u308c\u3001\u4e00\u90e8\u306e\u975e\u63a8\u5968\u30e1\u30bd\u30c3\u30c9\u3082\u524a\u9664\u3055\u308c\u307e\u3059\u3002\u3053\u3053\u304b\u3089\u306f\u524a\u9664\u3055\u308c\u308b\u975e\u63a8\u5968\u30e1\u30bd\u30c3\u30c9\u306e\u6982\u8981\u3068\u3001DOM\u95a2\u9023\u306e\u30b3\u30fc\u30c9\u3092\u66f4\u65b0\u3059\u308b\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<h3>1. react-dom\/test-utils API\u306e\u524a\u9664<\/h3>\n<p><code><a href=\"https:\/\/react.dev\/warnings\/react-dom-test-utils\" target=\"_blank\" rel=\"noopener noreferrer\">react-dom\/test-utils<\/a><\/code> API\u3082\u307e\u305f\u3001React 19\u3067\u524a\u9664\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306fReact\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u30c6\u30b9\u30c8\u306e\u66f8\u304d\u65b9\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u3001\u5177\u4f53\u7684\u306b\u306f\u3001<code>act<\/code>\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u304c<code>react-dom\/test-utils<\/code>\u304b\u3089<code>react<\/code>\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u79fb\u884c\u3057\u307e\u3059\u3002<\/p>\n<p>\u3055\u3089\u306b\u3001<code>react-dom\/test-utils<\/code>\u306e\u4ed6\u306e\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u3082\u307b\u307c\u3059\u3079\u3066<a href=\"https:\/\/react.dev\/warnings\/react-dom-test-utils\" target=\"_blank\" rel=\"noopener noreferrer\">\u524a\u9664<\/a>\u3055\u308c\u307e\u3059\u3002\u4ee5\u4e0b\u3001\u3053\u306e\u5909\u66f4\u306b\u5bfe\u5fdc\u3059\u308b\u305f\u3081\u306e\u30c6\u30b9\u30c8\u306e\u66f8\u304d\u65b9\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<p><code>act<\/code>\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u306f\u3001\u30c6\u30b9\u30c8\u306b\u95a2\u9023\u3059\u308b\u3059\u3079\u3066\u306e\u66f4\u65b0\u304c\u51e6\u7406\u3055\u308c\u3001DOM\u306b\u9069\u7528\u3055\u308c\u305f\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306b\u6b20\u304b\u305b\u307e\u305b\u3093\u3002React 19\u3067\u306f\u3001<code>react-dom\/test-utils<\/code>\u3067\u306f\u306a\u304f<code>react<\/code>\u304b\u3089<code>act<\/code>\u3092\u76f4\u63a5\u30a4\u30f3\u30dd\u30fc\u30c8\u3057\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-jsx\">\/\/ \u3053\u308c\u307e\u3067\nimport { act } from 'react-dom\/test-utils';\n\n\/\/ \u3053\u308c\u304b\u3089\nimport { act } from 'react';<\/code><\/pre>\n<aside role=\"note\" class=\"wp-block-kinsta-notice is-style-info\">\n            <h3>Info<\/h3>\n        <p><code>react-dom\/test-utils<\/code>\u304b\u3089\u65b0\u305f\u306a\u30a4\u30f3\u30dd\u30fc\u30c8\u306b\u5207\u308a\u66ff\u3048\u308b\u306b\u306f\u3001\u4ee5\u4e0b\u306ecodemod\u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-bash\">npx codemod@latest react\/19\/replace-act-import<\/code><\/pre>\n<p><\/p>\n<\/aside>\n\n<p>React\u30c1\u30fc\u30e0\u306f\u307e\u305f\u3001\u6700\u65b0\u304b\u3064\u5341\u5206\u306b\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u305f\u30c6\u30b9\u30c8\u4f53\u9a13\u3092\u8003\u616e\u3057\u3001React Testing Library\u3078\u306e\u79fb\u884c\u3092\u63a8\u5968\u3057\u3066\u3044\u307e\u3059\u3002\u4ee5\u4e0b\u3001\u4e00\u822c\u7684\u306a\u4f7f\u7528\u4f8b\u3068\u305d\u306e\u66f4\u65b0\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<p><code>renderIntoDocument<\/code>\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u306f\u524a\u9664\u3055\u308c\u3001<code>@testing-library\/react<\/code>\u304b\u3089<code>render<\/code>\u306b\u7f6e\u304d\u63db\u3048\u3089\u308c\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-js\">\/\/ \u3053\u308c\u307e\u3067\nimport { renderIntoDocument } from 'react-dom\/test-utils';\n\nrenderIntoDocument(&lt;Component \/&gt;);\n\n\/\/ \u3053\u308c\u304b\u3089\nimport { render } from '@testing-library\/react';\n\nrender(&lt;Component \/&gt;);<\/code><\/pre>\n<p>\u540c\u69d8\u306b\u3001\u30a4\u30d9\u30f3\u30c8\u3092\u518d\u73fe\u3059\u308b\u305f\u3081\u306e<code>Simulate<\/code>\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u3082\u524a\u9664\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306b\u306f\u3001\u8981\u7d20\u306b\u5b9f\u969b\u306e\u30a4\u30d9\u30f3\u30c8\u3092\u767a\u751f\u3055\u305b\u308b<code>@testing-library\/react<\/code>\u306e<code>fireEvent<\/code>\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-js\">\/\/ \u3053\u308c\u307e\u3067\nimport { Simulate } from 'react-dom\/test-utils';\n\nconst element = document.querySelector('button');\nSimulate.click(element);\n\n\/\/ \u3053\u308c\u304b\u3089\nimport { fireEvent } from '@testing-library\/react';\n\nconst element = document.querySelector('button');\nfireEvent.click(element);<\/code><\/pre>\n<p>\u306a\u304a\u3001<code>fireEvent<\/code>\u306f\u5b9f\u969b\u306e\u30a4\u30d9\u30f3\u30c8\u3092\u767a\u751f\u3055\u305b\u308b\u305f\u3081\u3001<code>Simulate<\/code>\u306b\u3088\u3063\u3066\u4f5c\u6210\u3055\u308c\u305f\u5408\u6210\u30a4\u30d9\u30f3\u30c8\u3088\u308a\u3082\u81ea\u7136\u306b\u8981\u7d20\u3068\u76f8\u4e92\u4f5c\u7528\u3057\u307e\u3059\u3002<a href=\"https:\/\/testing-library.com\/docs\/\" target=\"_blank\" rel=\"noopener noreferrer\">React Testing Library\u306e\u8a73\u7d30\u306f\u3053\u3061\u3089<\/a>\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3>2. findDOMNode API\u306e\u524a\u9664<\/h3>\n<p><a href=\"https:\/\/legacy.reactjs.org\/blog\/2018\/10\/23\/react-v-16-6.html#deprecations-in-strictmode\" target=\"_blank\" rel=\"noopener noreferrer\">React 16.6.0\u3067\u975e\u63a8\u5968<\/a>\u3068\u306a\u3063\u305f<code>ReactDOM.findDOMNode<\/code>\u306e\u524a\u9664\u3082\u307e\u305f\u3001React 19\u306e\u91cd\u8981\u306a\u5909\u66f4\u70b9\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u95a2\u6570\u306f\u3001React\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u57fa\u790e\u3068\u306a\u308bDOM\u30ce\u30fc\u30c9\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3057\u305f\u304c\u3001\u5b9f\u884c\u901f\u5ea6\u304c\u9045\u3044\u3001\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u304c\u56f0\u96e3\u3001\u62bd\u8c61\u5316\u30ec\u30a4\u30e4\u30fc\u3092\u7834\u58ca\u3059\u308b\u306a\u3069\u3001<a href=\"https:\/\/legacy.reactjs.org\/docs\/strict-mode.html#warning-about-deprecated-finddomnode-usage\" target=\"_blank\" rel=\"noopener noreferrer\">\u3044\u304f\u3064\u304b\u306e\u6b20\u70b9<\/a>\u304c\u3042\u308a\u307e\u3057\u305f\u3002<\/p>\n<p>\u4eca\u5f8c\u306f\u3001React\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306eDOM\u8981\u7d20\u3068\u306e\u5bfe\u8a71\u306b\u3088\u308a\u4fe1\u983c\u6027\u304c\u9ad8\u304f\u52b9\u7387\u7684\u306a\u65b9\u6cd5\u3092\u63d0\u4f9b\u3059\u308b<a href=\"https:\/\/react.dev\/learn\/manipulating-the-dom-with-refs\" target=\"_blank\" rel=\"noopener noreferrer\">DOM\u7528\u306erefs<\/a>\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306f\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u30de\u30a6\u30f3\u30c8\u3055\u308c\u305f\u969b\u306b\u5165\u529b\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u30c6\u30ad\u30b9\u30c8\u3092\u9078\u629e\u3059\u308b\u305f\u3081\u306b<code>findDOMNode<\/code>\u3092\u4f7f\u7528\u3059\u308b\u4f8b\u3067\u3059\u3002<\/p>\n<pre><code class=\"language-jsx\">import { findDOMNode } from 'react-dom';\n\nfunction AutoselectingInput() {\n  useEffect(() =&gt; {\n    const input = findDOMNode(this);\n    input.select()\n  }, []);\n\n  render() {\n    return &lt;input defaultValue=\"Hello\" \/&gt;;\n  }\n}<\/code><\/pre>\n<p>\u3053\u306e\u30b3\u30fc\u30c9\u3092React 19\u306b\u5bfe\u5fdc\u3055\u305b\u308b\u306b\u306f\u3001<code>findDOMNode<\/code>\u3092<code>ref<\/code>\u306b\u7f6e\u304d\u63db\u3048\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u30b3\u30fc\u30c9\u304c\u3088\u308a\u5805\u7262\u306b\u306a\u308a\u3001\u6700\u65b0\u306eReact\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u306b\u6cbf\u3046\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-jsx\">import React, { useEffect, useRef } from 'react';\n\nfunction AutoselectingInput() {\n  const inputRef = useRef(null);\n\n  useEffect(() =&gt; {\n    inputRef.current.select();\n  }, []);\n\n  return &lt;input ref={inputRef} defaultValue=\"Hello\" \/&gt;;\n}<\/code><\/pre>\n<h3>3. ReactDOM.render\u306e\u524a\u9664<\/h3>\n<p><code>ReactDOM.render<\/code>\u3082\u524a\u9664\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f<a href=\"https:\/\/react.dev\/blog\/2022\/03\/08\/react-18-upgrade-guide\" target=\"_blank\" rel=\"noopener noreferrer\">React 18.0.0\u3067\u975e\u63a8\u5968<\/a>\u3068\u306a\u308a\u3001React\u30a2\u30d7\u30ea\u306e\u521d\u671f\u5316\u30fb\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306b\u3088\u308a\u52b9\u7387\u7684\u3067\u65b0\u3057\u3044\u65b9\u6cd5\u3092\u63d0\u4f9b\u3059\u308b<code>react-dom\/client<\/code>\u304b\u3089\u306e<code>createRoot<\/code> API\u304c\u4ee3\u308f\u308a\u306b\u63a1\u7528\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u306e\u5909\u66f4\u306f\u3001\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u5408\u7406\u5316\u3068\u6700\u9069\u5316\u3092\u76ee\u6307\u3059React\u306e\u7d99\u7d9a\u7684\u306a\u53d6\u308a\u7d44\u307f\u306e\u4e00\u74b0\u3067\u3059\u3002<\/p>\n<p>\u4e00\u822c\u7684\u306aWordPress\u306e\u8a2d\u5b9a\u3067\u306f\u3001DOM\u306e\u7528\u610f\u304c\u3067\u304d\u305f\u969b\u306bReact\u30a2\u30d7\u30ea\u3092\u521d\u671f\u5316\u3059\u308b\u30ab\u30b9\u30bf\u30e0\u30d6\u30ed\u30c3\u30af\u3084\u30d7\u30e9\u30b0\u30a4\u30f3\u304c\u3042\u308a\u307e\u3059\u3002\u4ee5\u524d\u306f\u3001\u3053\u306e\u3088\u3046\u306a\u72b6\u6cc1\u3067<code>ReactDOM.render<\/code>\u304c\u4f7f\u308f\u308c\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n<pre><code class=\"language-jsx\">import { render } from 'react-dom';\nrender(&lt;App \/&gt;, document.getElementById('root'));<\/code><\/pre>\n<p>React 19\u3067\u306f\u3001React\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u521d\u671f\u5316\u3068\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306b<code>createRoot<\/code>\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-jsx\">import { createRoot } from 'react-dom\/client';\nconst root = createRoot(document.getElementById('root'));\nroot.render(&lt;App \/&gt;);<\/code><\/pre>\n<aside role=\"note\" class=\"wp-block-kinsta-notice is-style-info\">\n            <h3>Info<\/h3>\n        <p><code>ReactDOM.render<\/code>\u3092<code>react-dom\/client<\/code>\u306e<code>createRoot<\/code> API\u306b\u5207\u308a\u66ff\u3048\u308b\u306b\u306f\u3001\u4ee5\u4e0b\u306ecodemod\u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-bash\">npx codemod@latest react\/19\/replace-reactdom-render<\/code><\/pre>\n<p><\/p>\n<\/aside>\n\n<h3>4. unmountComponentAtNode API\u306e\u524a\u9664<\/h3>\n<p><a href=\"https:\/\/react.dev\/blog\/2022\/03\/08\/react-18-upgrade-guide\" target=\"_blank\" rel=\"noopener noreferrer\">React 18.0.0\u3067\u975e\u63a8\u5968<\/a>\u3068\u306a\u3063\u305f<code>ReactDOM.unmountComponentAtNode<\/code>\u3082\u524a\u9664\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001React\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092DOM\u304b\u3089\u30a2\u30f3\u30de\u30a6\u30f3\u30c8\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n<p>React 19 \u3067\u306f\u3001\u30eb\u30fc\u30c4\u306e\u4f5c\u6210\u3068\u30cf\u30a4\u30c9\u30ec\u30fc\u30b7\u30e7\u30f3\u306eAPI\u306e\u66f4\u65b0\u306b\u3088\u308a\u3001\u4ee3\u308f\u308a\u306b<code>root.unmount()<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-js\">\/\/ \u3053\u308c\u307e\u3067\nunmountComponentAtNode(document.getElementById('root'));\n\n\/\/ \u3053\u308c\u304b\u3089\nroot.unmount();<\/code><\/pre>\n<aside role=\"note\" class=\"wp-block-kinsta-notice is-style-info\">\n            <h3>Info<\/h3>\n        <p><code>unmountComponentAtNode<\/code>\u304b\u3089<code>root.unmount<\/code>\u306b\u5207\u308a\u66ff\u3048\u308b\u306b\u306f\u3001\u4ee5\u4e0b\u306ecodemod\u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre><code class=\"language-bash\">npx codemod@latest react\/19\/replace-reactdom-render<\/code><\/pre>\n<p><\/p>\n<\/aside>\n\n<h3>5. ReactDOM.hydrate\u306e\u524a\u9664<\/h3>\n<p>ReactDOM.hydrate\u306f<a href=\"https:\/\/react.dev\/blog\/2022\/03\/08\/react-18-upgrade-guide\" target=\"_blank\" rel=\"noopener noreferrer\">React 18\u3067\u975e\u63a8\u5968<\/a>\u3068\u306a\u308a\u3001React 19\u3067\u5b8c\u5168\u306b\u524a\u9664\u3055\u308c\u308b\u4e88\u5b9a\u3067\u3059\u3002<\/p>\n<p><code>ReactDOM.hydrate<\/code>\u3092\u7f6e\u304d\u63db\u3048\u308b\u306e\u306f\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u7528\u306eReact DOM API\u306e\u65b0\u305f\u306a\u30e1\u30bd\u30c3\u30c9\u3067\u3042\u308b<code>hydrateRoot<\/code>\u3067\u3059\u3002\u30b5\u30fc\u30d0\u30fc\u3067\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u305fReact\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u30cf\u30a4\u30c9\u30ec\u30fc\u30c8\u3059\u308b\u3001\u52b9\u7387\u7684\u304b\u3064\u6700\u65b0\u306e\u624b\u6cd5\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u305f\u3068\u3048\u3070WordPress\u306e\u6587\u8108\u3067\u306f\u3001\u30da\u30fc\u30b8\u306e\u8aad\u307f\u8fbc\u307f\u3092\u9ad8\u901f\u5316\u3059\u308b\u305f\u3081\u3001\u30b5\u30fc\u30d0\u30fc\u30b5\u30a4\u30c9\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\uff08SSR\uff09\u3092\u4f7f\u7528\u3057\u3066\u6700\u521d\u306eHTML\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u914d\u4fe1\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u30a4\u30f3\u30bf\u30e9\u30af\u30c6\u30a3\u30d6\u306aReact\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u30cf\u30a4\u30c9\u30ec\u30fc\u30c8\u3059\u308b\u306b\u306f\u3001<code>ReactDOM.hydrate<\/code>\u3092\u4f7f\u7528\u3059\u308b\u306e\u304c\u4e00\u822c\u7684\u3067\u3057\u305f\u3002<\/p>\n<pre><code class=\"language-jsx\">import { hydrate } from 'react-dom';\nimport App from '.\/App.js';\n\nhydrate(\n  &lt;App \/&gt;,\n  document.getElementById('root')\n);<\/code><\/pre>\n<p>React 19\u3067\u306f\u3001\u30cf\u30a4\u30c9\u30ec\u30fc\u30b7\u30e7\u30f3\u306b<code>react-dom\/client<\/code>\u306e<code>hydrateRoot<\/code>\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-jsx\">import { hydrateRoot } from 'react-dom\/client';\nimport App from '.\/App.js';\n\nhydrateRoot(\n  document.getElementById('root'),\n  &lt;App \/&gt;\n);<\/code><\/pre>\n<aside role=\"note\" class=\"wp-block-kinsta-notice is-style-info\">\n            <h3>Info<\/h3>\n        <p><code>ReactDOM.hydrate<\/code>\u304b\u3089<code>ReactDOMClient.hydrateRoot<\/code>\u306b\u5207\u308a\u66ff\u3048\u308b\u306b\u306f\u3001\u4ee5\u4e0b\u306ecodemod\u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-bash\">npx codemod@latest react\/19\/replace-reactdom-render<\/code><\/pre>\n<p><\/p>\n<\/aside>\n\n<h2>\u524a\u9664\u3055\u308c\u308b\u975e\u63a8\u5968\u306eTypeScript\u578b<\/h2>\n<p>WordPress\u958b\u767a\u3067\u306f\u3001React\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u578b\u5b89\u5168\u6027\u3001\u30b3\u30fc\u30c9\u306e\u8cea\u3092\u5411\u4e0a\u3055\u305b\u308b\u305f\u3081\u306bTypeScript\u3092\u4e00\u822c\u7684\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002React 19\u3067\u306f\u3001\u975e\u63a8\u5968TypeScript\u578b\u306e\u4e00\u90e8\u304c\u524a\u9664\u3001\u307e\u305f\u306f\u3088\u308a\u95a2\u9023\u6027\u306e\u9ad8\u3044\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u79fb\u884c\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u5909\u66f4\u3092\u628a\u63e1\u3059\u308b\u3053\u3068\u306f\u3001\u30b3\u30fc\u30c9\u30d9\u30fc\u30b9\u3068React\u306e\u6700\u65b0\u30d0\u30fc\u30b8\u30e7\u30f3\u306e\u4e92\u63db\u6027\u3092\u78ba\u4fdd\u3057\u3001\u5805\u7262\u306a\u30b3\u30fc\u30c9\u3092\u7dad\u6301\u3059\u308b\u305f\u3081\u306b\u975e\u5e38\u306b\u91cd\u8981\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>React\u30c1\u30fc\u30e0\u306f\u3001\u79fb\u884c\u3092\u652f\u63f4\u3059\u308b<code><a href=\"https:\/\/github.com\/eps1lon\/types-react-codemod\/\" target=\"_blank\" rel=\"noopener noreferrer\">types-react-codemod<\/a><\/code>\u30c4\u30fc\u30eb\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u3092\u4f7f\u7528\u3059\u308b\u306b\u306f\u3001\u4ee5\u4e0b\u306ecodemod\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u308c\u306b\u306f\u975e\u63a8\u5968\u306e\u578b\u3092\u66f4\u65b0\u3059\u308b\u305f\u3081\u306e\u30b3\u30fc\u30c9\u5909\u63db\u304c\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-bash\">npx types-react-codemod@latest preset-19 .\/path-to-app<\/code><\/pre>\n<p>\u307e\u305f\u3053\u306e\u30c4\u30fc\u30eb\u306b\u306f\u5bfe\u8a71\u30e2\u30fc\u30c9\u3082\u3042\u308a\u3001\u7279\u5b9a\u306e\u5909\u63db\u3092\u9078\u3093\u3067\u9069\u7528\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<pre><code class=\"language-bash\">? Pick transforms to apply (Press  to select,  to toggle all,  to invert selection, and  to proceed)\n\u276f\u25ef context-any\n\u25c9 deprecated-react-type\n\u25c9 deprecated-sfc-element\n\u25c9 deprecated-sfc\n\u25c9 deprecated-stateless-component\n\u25ef implicit-children\n\u25ef useCallback-implicit-any<\/code><\/pre>\n<p>\u4ee5\u4e0b\u3001\u4e3b\u306a\u5909\u66f4\u70b9\u306e\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>1. ref\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7\u306e\u5fc5\u9808\u5316<\/h3>\n<p>React 19\u3067\u306f\u3001<code>ref<\/code>\u306e\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7\u95a2\u6570\u304c\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u5f62\u5f0f\u306e<code>ref<\/code>\u3067\u660e\u793a\u7684\u306a\u30ea\u30bf\u30fc\u30f3\u3092\u5f37\u5236\u3059\u308b\u3053\u3068\u3067\u3001\u578b\u5b89\u5168\u6027\u3092\u78ba\u4fdd\u3057\u3066\u3044\u307e\u3059\u3002\u6697\u9ed9\u306e\u623b\u308a\u5024\u306f\u3001TypeScript\u304c\u623b\u308a\u5024\u3092\u8aa4\u89e3\u91c8\u3059\u308b\u539f\u56e0\u306b\u306a\u308a\u5f97\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-tsx\">\/\/ \u3053\u308c\u307e\u3067\n (instance = current)} \/&gt;\n\n\/\/ \u3053\u308c\u304b\u3089\n { instance = current }} \/&gt;<\/code><\/pre>\n<h3>2. useRef\u306e\u5f15\u6570\u306e\u5fc5\u9808\u5316<\/h3>\n<p>\u4ee5\u524d\u306f\u3001\u5f15\u6570\u306a\u3057\u3067<code>useRef<\/code>\u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u305f\u305f\u3081\u3001\u6f5c\u5728\u7684\u306a\u578b\u306e\u554f\u984c\u3092\u5f15\u304d\u8d77\u3053\u3057\u3066\u3044\u307e\u3057\u305f\u3002React 19\u3067\u306f\u3001<code>useRef<\/code>\u306fref\u304c\u5e38\u306b\u30df\u30e5\u30fc\u30bf\u30d6\u30eb\u3067\u3042\u308b\u3053\u3068\u3092\u4fdd\u8a3c\u3059\u308b\u305f\u3081\u306b\u5f15\u6570\u3092\u5fc5\u8981\u3068\u3057\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-tsx\">\/\/ \u3053\u308c\u307e\u3067 \u2014 @ts-expect-error: 1\u3064\u306e\u5f15\u6570\u304c\u671f\u5f85\u3055\u308c\u3066\u3044\u305f\u304c\u4f55\u3082\u898b\u3064\u304b\u3089\u306a\u304b\u3063\u305f\nuseRef();\n\n\/\/ \u3053\u308c\u304b\u3089 \u2014 \u5f15\u6570\u3092\u4f7f\u3063\u305f\u6b63\u3057\u3044\u4f7f\u7528\u65b9\u6cd5\nuseRef(undefined);<\/code><\/pre>\n<h3>3. ReactElement TypeScript\u578b\u306e\u5909\u66f4<\/h3>\n<p><code>ReactElement<\/code> props\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u578b\u304c<code>any<\/code>\u304b\u3089<code>unknown<\/code>\u306b\u5909\u66f4\u3055\u308c\u3001\u672a\u77e5\u306e\u578b\u306e\u660e\u793a\u7684\u306a\u51e6\u7406\u3092\u8981\u6c42\u3059\u308b\u3053\u3068\u3067\u3001\u578b\u306e\u5b89\u5168\u6027\u304c\u5411\u4e0a\u3057\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-tsx\">\/\/ \u3053\u308c\u307e\u3067 \u2500 'any'\ntype Example = ReactElement[\"props\"];\n\n\/\/ \u3053\u308c\u304b\u3089\u3000\u3000\u2500 'unknown'\ntype Example = ReactElement[\"props\"];<\/code><\/pre>\n<p><code>any<\/code>\u306b\u4f9d\u5b58\u3057\u3066\u3044\u305f\u30b3\u30fc\u30c9\u306f\u3001<code>unknown<\/code>\u3092\u660e\u793a\u7684\u306b\u51e6\u7406\u3059\u308b\u3088\u3046\u306b\u66f4\u65b0\u3059\u308b\u304b\u3001<code>any<\/code>\u306b\u30ad\u30e3\u30b9\u30c8\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>WordPress\u958b\u767a\u3092\u884c\u3046\u5834\u5408\u3001\u6700\u65b0\u306eReact\u306b\u5bfe\u5fdc\u3059\u308b\u3053\u3068\u306f\u975e\u5e38\u306b\u91cd\u8981\u3067\u3059\u3002\u4eca\u56de\u306f\u3001React\u306e\u3055\u307e\u3056\u307e\u306a\u5909\u66f4\u70b9\u3092\u3054\u7d39\u4ecb\u3057\u3001WordPress\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306b\u9069\u7528\u3059\u308b\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>React 19\u3067\u306f\u3001\u65b0\u305f\u306aJSX\u30c8\u30e9\u30f3\u30b9\u30d5\u30a9\u30fc\u30e0\u304c\u5fc5\u8981\u306b\u306a\u308a\u307e\u3059\u304c\u3001\u5e78\u3044<a href=\"https:\/\/make.wordpress.org\/core\/2024\/06\/06\/jsx-in-wordpress-6-6\/\" target=\"_blank\" rel=\"noopener noreferrer\">WordPress 6.6\u306b\u6a19\u6e96\u642d\u8f09<\/a>\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u30c8\u30e9\u30f3\u30b9\u30d5\u30a9\u30fc\u30e0\u304c\u6709\u52b9\u306b\u306a\u3063\u3066\u3044\u306a\u3044\u5834\u5408\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u8b66\u544a\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-bash\">Your app (or one of its dependencies) is using an outdated JSX transform. Update to the modern JSX transform for faster performance: https:\/\/react.dev\/link\/new-jsx-transform<\/code><\/pre>\n<blockquote><p>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\uff08\u307e\u305f\u306f\u305d\u306e\u4f9d\u5b58\u95a2\u4fc2\u306e1\u3064\uff09\u304c\u53e4\u3044JSX\u30c8\u30e9\u30f3\u30b9\u30d5\u30a9\u30fc\u30e0\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u6700\u65b0\u306e\u3082\u306e\u306b\u66f4\u65b0\u3057\u3066\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5411\u4e0a\u3055\u305b\u3066\u304f\u3060\u3055\u3044<\/p><\/blockquote>\n<p>\u306a\u304a\u3001JSX\u30c8\u30e9\u30f3\u30b9\u30d5\u30a9\u30fc\u30e0\u306bReact\u30a4\u30f3\u30dd\u30fc\u30c8\u3092\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>React 19\u3078\u306e\u5bfe\u5fdc\u306b\u95a2\u3057\u3066\u7d39\u4ecb\u304c\u6f0f\u308c\u3066\u3044\u308b\u70b9\u3084\u3054\u8cea\u554f\u306a\u3069\u304c\u3042\u308a\u307e\u3057\u305f\u3089\u3001\u4ee5\u4e0b\u306e\u30b3\u30e1\u30f3\u30c8\u6b04\u3067\u304a\u77e5\u3089\u305b\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>WordPress\u958b\u767a\u3067\u306f\u3001\u72ec\u81ea\u306eReact\u30b3\u30f3\u30dd\u30fc &#8230;<\/p>\n","protected":false},"author":287,"featured_media":58530,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kinsta_gated_content":false,"_kinsta_gated_content_redirect":"","footnotes":""},"tags":[],"topic":[802],"class_list":["post-58529","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","topic-react"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.6 (Yoast SEO v24.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>React 19\u306e\u5909\u66f4\u70b9\u3068\u5bfe\u5fdc\u65b9\u6cd5\uff08WordPress 6.6\u30e6\u30fc\u30b6\u30fc\u5fc5\u8aad\uff09\uff5cKinsta\u00ae<\/title>\n<meta name=\"description\" content=\"React 19\u3078\u306e\u30b9\u30e0\u30fc\u30ba\u306a\u79fb\u884c\u3068\u30b5\u30a4\u30c8\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u5411\u4e0a\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u3001\u6700\u65b0\u30d0\u30fc\u30b8\u30e7\u30f3\u306e\u4e3b\u306a\u5909\u66f4\u70b9\u3001\u4e92\u63db\u6027\u306e\u30d2\u30f3\u30c8\u3001\u304a\u3088\u3073\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kinsta.com\/jp\/blog\/react-19-wordpress\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"React 19\u306e\u5909\u66f4\u70b9\u3068\u5bfe\u5fdc\u65b9\u6cd5\uff08WordPress 6.6\u5229\u7528\u8005\u5411\u3051\uff09\" \/>\n<meta property=\"og:description\" content=\"React 19\u3078\u306e\u30b9\u30e0\u30fc\u30ba\u306a\u79fb\u884c\u3068\u30b5\u30a4\u30c8\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u5411\u4e0a\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u3001\u6700\u65b0\u30d0\u30fc\u30b8\u30e7\u30f3\u306e\u4e3b\u306a\u5909\u66f4\u70b9\u3001\u4e92\u63db\u6027\u306e\u30d2\u30f3\u30c8\u3001\u304a\u3088\u3073\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/kinsta.com\/jp\/blog\/react-19-wordpress\/\" \/>\n<meta property=\"og:site_name\" content=\"Kinsta\u00ae\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/Kinsta-Japan-334616080691171\/\" \/>\n<meta property=\"article:published_time\" content=\"2024-07-05T07:33:04+00:00\" \/>\n<meta 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