{"id":1824,"date":"2026-02-02T16:04:08","date_gmt":"2026-02-02T07:04:08","guid":{"rendered":"https:\/\/www.fandmnet.com\/blog\/?p=1824"},"modified":"2026-02-02T16:04:08","modified_gmt":"2026-02-02T07:04:08","slug":"typescript%e3%81%ae%e9%ad%85%e5%8a%9b%e3%82%92%e8%a7%a3%e8%aa%ac%ef%bc%81%e5%88%9d%e5%bf%83%e8%80%85%e3%81%a7%e3%82%82%e3%82%8f%e3%81%8b%e3%82%8b%e5%9f%ba%e7%a4%8e%e8%ac%9b%e5%ba%a7","status":"publish","type":"post","link":"https:\/\/www.fandmnet.com\/blog\/1824\/","title":{"rendered":"TypeScript\u306e\u9b45\u529b\u3092\u89e3\u8aac\uff01\u521d\u5fc3\u8005\u3067\u3082\u308f\u304b\u308b\u57fa\u790e\u8b1b\u5ea7"},"content":{"rendered":"\n<p><span class=\"pre--font-size span-stk-fs-s\">\u3053\u3093\u306b\u3061\u306f\u3002Web\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u30cb\u30ad\u3067\u3059\uff01<br>\u4eca\u56de\u306f\u3001\u6700\u8fd1\u306e\u30e2\u30c0\u30f3\u306a\u958b\u767a\u73fe\u5834\u3067\u6ce8\u76ee\u3055\u308c\u3066\u3044\u308b\u300cTypeScript\u300d\u306b\u3064\u3044\u3066\u3001\u57fa\u790e\u304b\u3089\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/span><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">TypeScript\u3068\u306f\uff1f<\/h2>\n\n\n\n<p>TypeScript\u306f\u3001Microsoft\u793e\u304c\u958b\u767a\u3057\u305f\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u3059\u3002<br>\u540d\u524d\u304cJavaScript\u306b\u4f3c\u3066\u3044\u308b\u306e\u3067\u3001\u300c\u4f55\u304b\u95a2\u4fc2\u304c\u3042\u308b\u306e\u304b\u306a\uff1f\u300d\u3068\u601d\u3063\u305f\u65b9\u3082\u3044\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u305d\u306e\u901a\u308a\u3001TypeScript\u306fJavaScript\u306e\u4e0a\u4f4d\u4e92\u63db\u3068\u3057\u3066\u52d5\u4f5c\u3059\u308b\u8a00\u8a9e\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u7c21\u5358\u306b\u8a00\u3046\u3068\u3001<br><strong>TypeScript = JavaScript + \u578b<\/strong>\u3000\u3068\u3044\u3046\u95a2\u4fc2\u6027\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<br>\u3053\u308c\u306b\u3088\u308a\u3001\u3088\u308a\u5b89\u5168\u3067\u52b9\u7387\u7684\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e3b\u306a\u7279\u5fb4<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u30b9\u30fc\u30d1\u30fc\u30bb\u30c3\u30c8<\/h3>\n\n\n\n<p>\u30b9\u30fc\u30d1\u30fc\u30bb\u30c3\u30c8\u3068\u306f\u3001\u3042\u308b\u8a00\u8a9e\u304c\u5143\u306e\u8a00\u8a9e\u306e\u6280\u8853\u30fb\u4ed5\u69d8\u3092\u3059\u3079\u3066\u6301\u3061\u306a\u304c\u3089\u3001\u65b0\u305f\u306a\u6a5f\u80fd\u3092\u8ffd\u52a0\u3057\u305f\u3082\u306e\u3092\u8868\u3059\u8a00\u8449\u3067\u3059\u3002<br>TypeScript\u306f\u3001JavaScript\u306e\u3059\u3079\u3066\u306e\u6a5f\u80fd\u3092\u305d\u306e\u307e\u307e\u4f7f\u3048\u308b\u300c\u30b9\u30fc\u30d1\u30fc\u30bb\u30c3\u30c8\u300d\u3067\u3059\u3002\u65e2\u5b58\u306eJavaScript\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306b\u3082\u6bb5\u968e\u7684\u306b\u5c0e\u5165\u3067\u304d\u308b\u305f\u3081\u3001\u4e92\u63db\u6027\u304c\u975e\u5e38\u306b\u9ad8\u3044\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">JavaScript\u74b0\u5883\u3068\u306e\u4e92\u63db\u6027<\/h3>\n\n\n\n<p>\u30d6\u30e9\u30a6\u30b6\u3084Node.js\u3001Deno\u306a\u3069\u3001JavaScript\u304c\u52d5\u4f5c\u3059\u308b\u74b0\u5883\u3067\u305d\u306e\u307e\u307e\u5229\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u9759\u7684\u578b\u30c1\u30a7\u30c3\u30af<\/h3>\n\n\n\n<p>JavaScript\u3067\u3042\u308a\u304c\u3061\u306a\u300c\u5b9f\u884c\u3057\u3066\u521d\u3081\u3066\u767a\u899a\u3059\u308b\u300d\u578b\u306e\u4e0d\u6574\u5408\u306b\u3088\u308b\u30a8\u30e9\u30fc\u3092\u3001TypeScript\u306f\u958b\u767a\u6bb5\u968e\u3067\u672a\u7136\u306b\u9632\u304e\u307e\u3059\u3002\u9759\u7684\u578b\u30c1\u30a7\u30c3\u30af\u306b\u3088\u3063\u3066\u6f5c\u5728\u7684\u306a\u30d0\u30b0\u3092\u65e9\u671f\u306b\u767a\u898b\u3067\u304d\u308b\u305f\u3081\u3001\u624b\u623b\u308a\u304c\u6e1b\u308a\u3001\u958b\u767a\u52b9\u7387\u304c\u5927\u304d\u304f\u5411\u4e0a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30eb\u51e6\u7406<\/h3>\n\n\n\n<p>\u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30eb\u3068\u306f\u3001Transform\uff08\u5909\u63db\uff09+ Compile\uff08\u30b3\u30f3\u30d1\u30a4\u30eb\uff09\u306e\u9020\u8a9e\u3067\u3059\u3002<br>\u3042\u308b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3092\u540c\u3058\u30ec\u30d9\u30eb\u62bd\u8c61\u5ea6\u3092\u6301\u3064\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u306b\u5909\u63db\u3059\u308b\u51e6\u7406\u306e\u3053\u3068\u3092\u6307\u3057\u307e\u3059\u3002<br>TypeScript\u306e\u30b3\u30fc\u30c9\u306f\u6700\u7d42\u7684\u306bJavaScript\u306b\u5909\u63db\uff08\u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30eb\uff09\u3055\u308c\u307e\u3059\u3002<br>\u5b9f\u884c\u6642\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u306a\u3044\u306e\u3082\u30dd\u30a4\u30f3\u30c8\u3067\u3059\u3002\u306a\u305c\u306a\u3089\u3001TypeScript\u306e\u578b\u60c5\u5831\u306f\u958b\u767a\u6642\u306b\u306e\u307f\u6a5f\u80fd\u3057\u3001\u5b9f\u884c\u6642\u306b\u306f\u524a\u9664\u3055\u308c\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001TypeScript\u306f\u300c\u5b89\u5168\u6027\u300d\u3068\u300c\u958b\u767a\u52b9\u7387\u300d\u3092\u4e21\u7acb\u3055\u305b\u305f\u73fe\u4ee3\u7684\u306a\u958b\u767a\u30c4\u30fc\u30eb\u3068\u3057\u3066\u3001\u591a\u304f\u306e\u958b\u767a\u73fe\u5834\u3067\u63a1\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u7279\u5fb4\u6bd4\u8f03\uff1aJavaScript vs TypeScript<\/h2>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u8868\u3067\u3001JavaScript\u3068TypeScript\u306e\u7279\u5fb4\u3092\u6bd4\u8f03\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table common-table stk-table-thdesign\"><table><thead><tr><th class=\"has-text-align-center\" data-align=\"center\"><strong>\u7279\u5fb4<\/strong><\/th><th><strong>JavaScript<\/strong><\/th><th><strong>TypeScript<\/strong><\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">\u578b\u30c1\u30a7\u30c3\u30af<\/td><td>\u306a\u3057\uff08\u30a8\u30e9\u30fc\u306f\u5b9f\u884c\u6642\u306b\u767a\u751f\uff09<\/td><td>\u3042\u308a\uff08\u958b\u767a\/\u30d3\u30eb\u30c9\u6642\u306b\u691c\u51fa\uff09<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u578b\u5b9a\u7fa9<\/td><td>\u4e0d\u8981<\/td><td>\u5fc5\u8981\uff08\u307e\u305f\u306f\u578b\u63a8\u8ad6\u3067\u88dc\u5b8c\uff09<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u5b89\u5168\u6027<\/td><td>\u578b\u306b\u3088\u308b\u5b89\u5168\u6027\u306f\u4f4e\u3044\uff0f<br>\u66d6\u6627\u306a\u307e\u307e\u5b9f\u884c<\/td><td>\u578b\u3067\u5b89\u5168\u6027\u3092\u660e\u793a\u7684\u306b\u78ba\u4fdd<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">TypeScript\u306e\u5229\u70b9<\/h2>\n\n\n\n<p>TypeScript\u306e\u6700\u5927\u306e\u5229\u70b9\u306f\u3001\u30d0\u30b0\u306e\u65e9\u671f\u767a\u898b\u3067\u3059\u3002<br>\u578b\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u5b9f\u884c\u524d\uff08\u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30eb\u6642\u3084\u30a8\u30c7\u30a3\u30bf\u4e0a\uff09\u306b\u30a8\u30e9\u30fc\u3092\u691c\u51fa\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001\u578b\u60c5\u5831\u304c\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306e\u4ee3\u308f\u308a\u306b\u3082\u306a\u308b\u305f\u3081\u3001\u8a8d\u8b58\u306e\u30ba\u30ec\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3055\u3089\u306b\u3001\u30a8\u30c7\u30a3\u30bf\u306e\u88dc\u5b8c\u6a5f\u80fd\u304c\u5f37\u5316\u3055\u308c\u308b\u305f\u3081\u3001\u958b\u767a\u52b9\u7387\u304c\u5927\u5e45\u306b\u5411\u4e0a\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u5177\u4f53\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ JavaScript\u306e\u5834\u5408\nconst user = {\n  name: \"Alice\",\n  age: 25\n};\n\n\/\/ \u30bf\u30a4\u30dd\u3057\u3066\u3082\u5b9f\u884c\u6642\u307e\u3067\u30a8\u30e9\u30fc\u304c\u308f\u304b\u3089\u306a\u3044\nconsole.log(user.email.toUpperCase());\n\/\/ \u2192 \u5b9f\u884c\u6642\u306b TypeError: Cannot read properties of undefined\n\n\/\/ TypeScript\u306e\u5834\u5408\ntype User = {\n  name: string,\n  age: number\n}\n\nconst user: User = {\n  name: \"Alice\",\n  age: 25\n};\n\n\/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u30a8\u30e9\u30fc\u3092\u691c\u51fa\u3067\u304d\u308b\nconsole.log(user.email.toUpperCase()); \/\/ \u30a8\u30e9\u30fc\uff1a\u30d7\u30ed\u30d1\u30c6\u30a3 'email' \u306f\u5b58\u5728\u3057\u307e\u305b\u3093\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">TypeScript\u306e\u578b\u4ed8\u3051\u306f\u30b3\u30b9\u30c8\u304b\u3001\u6295\u8cc7\u304b?<\/h2>\n\n\n\n<p>TypeScript\u306e\u5c0e\u5165\u306b\u306f\u3001\u78ba\u304b\u306b\u5b66\u7fd2\u30b3\u30b9\u30c8\u3084\u578b\u5b9a\u7fa9\u306e\u624b\u9593\u304c\u4f34\u3044\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u305d\u308c\u4ee5\u4e0a\u306e\u30e1\u30ea\u30c3\u30c8\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u904b\u7528\u6642\u306e\u30a8\u30e9\u30fc\u5bfe\u5fdc\u5de5\u6570\u306e\u524a\u6e1b<\/li>\n\n\n\n<li>\u5927\u898f\u6a21\u958b\u767a\u3067\u306e\u4fdd\u5b88\u6027\u5411\u4e0a<\/li>\n\n\n\n<li>\u81ea\u52d5\u7684\u306a\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u52b9\u679c\uff08\u5c02\u5c5e\u306e\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30ef\u30fc\u306e\u3088\u3046\u306a\u5f79\u5272\uff09<\/li>\n<\/ol>\n\n\n\n<p>\u3053\u308c\u3089\u3092\u8003\u3048\u308b\u3068\u3001TypeScript\u306e\u5c0e\u5165\u306f\u300c\u30b3\u30b9\u30c8\u300d\u3067\u306f\u306a\u304f\u300c\u6295\u8cc7\u300d\u3068\u3057\u3066\u6349\u3048\u308b\u3079\u304d\u3067\u3059\u3002\u4e2d\u9577\u671f\u7684\u306b\u306f\u3001\u958b\u767a\u52b9\u7387\u306e\u5411\u4e0a\u306b\u5927\u304d\u304f\u8ca2\u732e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u307e\u3068\u3081<\/h2>\n\n\n\n<p>TypeScript\u306f\u3001\u578b\u30b7\u30b9\u30c6\u30e0\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u958b\u767a\u6642\u306e\u5b89\u5168\u6027\u3092\u9ad8\u3081\u3001\u30d0\u30b0\u306e\u65e9\u671f\u767a\u898b\u3092\u53ef\u80fd\u306b\u3059\u308bJavaScript\u306e\u9032\u5316\u5f62\u3067\u3059\u3002\u7279\u306b\u5927\u898f\u6a21\u306a\u958b\u767a\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u306f\u3001\u305d\u306e\u30e1\u30ea\u30c3\u30c8\u304c\u5927\u304d\u304f\u767a\u63ee\u3055\u308c\u307e\u3059\u3002<br>\u3057\u304b\u3057\u3001TypeScript\u306e\u52b9\u679c\u3092\u6700\u5927\u9650\u306b\u5f15\u304d\u51fa\u3059\u305f\u3081\u306b\u306f\u3001\u6b63\u3057\u3044\u7406\u89e3\u306e\u3082\u3068\u3067\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u8aa4\u3063\u305f\u4f7f\u3044\u65b9\u3092\u3057\u3066\u3057\u307e\u3046\u3068\u3001\u304b\u3048\u3063\u3066\u5805\u7262\u6027\u3092\u640d\u306a\u3046\u53ef\u80fd\u6027\u3082\u3042\u308a\u307e\u3059\u3002<br>\u305d\u306e\u305f\u3081\u3001\u3057\u3063\u304b\u308a\u3068\u5b66\u3073\u306a\u304c\u3089\u5c0e\u5165\u3092\u9032\u3081\u308b\u3053\u3068\u304c\u6210\u529f\u306e\u9375\u3068\u306a\u308a\u307e\u3059\uff01<\/p>\n\n\n\n<p>\u6b21\u56de\u306f\u3001TypeScript\u306e\u57fa\u672c\u7684\u306a\u578b\u30b7\u30b9\u30c6\u30e0\u306b\u3064\u3044\u3066\u3001\u3055\u3089\u306b\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u304f\u4e88\u5b9a\u3067\u3059\u3002<br>\u304a\u697d\u3057\u307f\u306b\uff01<\/p>\n\n\n\n<p>\u30a8\u30d5\u30a2\u30f3\u30c9\u30a8\u30e0\u30cd\u30c3\u30c8\u682a\u5f0f\u4f1a\u793e\u3067\u306f\u4e00\u7dd2\u306b\u50cd\u304f\u4ef2\u9593\u3092\u52df\u96c6\u3057\u3066\u3044\u307e\u3059\uff01<\/p>\n\n\n\n<p>\u8a73\u3057\u304f\u306f<a 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