{"id":26856,"date":"2025-12-07T15:29:41","date_gmt":"2025-12-07T15:29:41","guid":{"rendered":"https:\/\/pokecon.jp\/job\/?p=26856"},"modified":"2025-12-07T15:29:41","modified_gmt":"2025-12-07T15:29:41","slug":"vitest-%e3%81%ae-expect-unreachable-%e3%81%a7%e6%9d%a1%e4%bb%b6%e5%88%86%e5%b2%90%e3%82%92%e4%bc%b4%e3%81%86%e3%83%86%e3%82%b9%e3%83%88%e3%81%a7%e5%9e%8b%e3%82%92%e7%b5%9e%e3%82%8a%e8%be%bc%e3%82%81","status":"publish","type":"post","link":"https:\/\/pokecon.jp\/job\/26856\/","title":{"rendered":"Vitest \u306e expect.unreachable \u3067\u6761\u4ef6\u5206\u5c90\u3092\u4f34\u3046\u30c6\u30b9\u30c8\u3067\u578b\u3092\u7d5e\u308a\u8fbc\u3081\u308b"},"content":{"rendered":"\n<\/p>\n<div wp_automatic_readability=\"79.057169634489\">\n<aside class=\"msg message\" wp_automatic_readability=\"0.56842105263158\"><span class=\"msg-symbol\">!<\/span><\/p>\n<div class=\"msg-content\" wp_automatic_readability=\"17.89247311828\">\n<p data-line=\"1\" class=\"code-line\">\u3053\u306e\u8a18\u4e8b\u306f\u3001<a target=\"_blank\" href=\"https:\/\/qiita.com\/advent-calendar\/2025\/typescript\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">Qiita \u306e TypeScript Advent Calendar 2025<\/a> \u306e 2025-12-08 \u6295\u7a3f\u5206\u3067\u3059\u3002<\/p>\n<\/div>\n<\/aside>\n<h2 id=\"expect.unreachable%E3%80%81%E3%81%8B%E3%81%AA%E3%82%8A%E4%BE%BF%E5%88%A9\" data-line=\"4\" class=\"code-line\">\n <code>expect.unreachable<\/code>\u3001\u304b\u306a\u308a\u4fbf\u5229<\/h2>\n<p data-line=\"6\" class=\"code-line\">Zod \u3084 Valibot \u306a\u3069\u3067\u4f5c\u6210\u3057\u305f schema \u306b\u3064\u3044\u3066\u3001Vitest \u3067 Unit \u30c6\u30b9\u30c8\u3092\u8a18\u8ff0\u3059\u308b\u969b\u306b\u3001\u300c\u6210\u529f\u3057\u305f\u304b\u3069\u3046\u304b\u300d\u306e\u5206\u5c90\u304c\u3067\u305f\u6642\u306b\u5c11\u3057\u56f0\u308a\u307e\u305b\u3093\u304b\uff1f<\/p>\n<div class=\"code-block-container\" wp_automatic_readability=\"10\">\n<pre class=\"language-ts\"><code class=\"language-ts code-line\" data-line=\"8\"><span class=\"token keyword\">import<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">as<\/span> v <span class=\"token keyword\">from<\/span> <span class=\"token string\">\"valibot\"<\/span><span class=\"token punctuation\">;<\/span>\n\n<span class=\"token keyword\">export<\/span> <span class=\"token keyword\">const<\/span> UserSchema <span class=\"token operator\">=<\/span> v<span class=\"token punctuation\">.<\/span><span class=\"token function\">object<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span>\n  name<span class=\"token operator\">:<\/span> v<span class=\"token punctuation\">.<\/span><span class=\"token function\">string<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>\n  age<span class=\"token operator\">:<\/span> v<span class=\"token punctuation\">.<\/span><span class=\"token function\">number<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n<\/code><\/pre>\n<\/div>\n<div class=\"code-block-container\" wp_automatic_readability=\"12\">\n<pre class=\"language-ts\"><code class=\"language-ts code-line\" data-line=\"17\">\n<span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> UserSchema <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">from<\/span> <span class=\"token string\">\".\/user\"<\/span><span class=\"token punctuation\">;<\/span>\n<span class=\"token keyword\">import<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">as<\/span> v <span class=\"token keyword\">from<\/span> <span class=\"token string\">\"valibot\"<\/span><span class=\"token punctuation\">;<\/span>\n\n<span class=\"token function\">it<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"should successfully parse a valid user\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=&gt;<\/span> <span class=\"token punctuation\">{<\/span>\n  <span class=\"token keyword\">const<\/span> user <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">{<\/span> name<span class=\"token operator\">:<\/span> <span class=\"token string\">\"John Doe\"<\/span><span class=\"token punctuation\">,<\/span> age<span class=\"token operator\">:<\/span> <span class=\"token number\">25<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span>\n  <span class=\"token keyword\">const<\/span> result <span class=\"token operator\">=<\/span> v<span class=\"token punctuation\">.<\/span><span class=\"token function\">safeParse<\/span><span class=\"token punctuation\">(<\/span>UserSchema<span class=\"token punctuation\">,<\/span> user<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n  <span class=\"token function\">expect<\/span><span class=\"token punctuation\">(<\/span>result<span class=\"token punctuation\">.<\/span>success<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toBe<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n\n  \n  \n  <span class=\"token function\">expect<\/span><span class=\"token punctuation\">(<\/span>result<span class=\"token punctuation\">.<\/span>output<span class=\"token punctuation\">.<\/span>age<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toEqual<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">25<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n  \n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n<\/code><\/pre>\n<\/div>\n<details wp_automatic_readability=\"8.3715351812367\">\n<summary>\u53c2\u8003: `output` \u306e\u30a2\u30af\u30bb\u30b9\u81ea\u4f53\u306f\u5931\u6557\u305b\u305a\u3001`unknown` \u578b\u306b\u306a\u308b\u7406\u7531<\/summary>\n<div class=\"details-content\" wp_automatic_readability=\"52.367392518146\">\n<p data-line=\"36\" class=\"code-line\">Valibot \u306e <code>safeParse<\/code> \u306e\u623b\u308a\u5024\u306e\u578b\u5b9a\u7fa9\u3092\u898b\u3066\u307f\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<ul data-line=\"38\" class=\"code-line\">\n<li data-line=\"38\" class=\"code-line\">\u6210\u529f\uff08<code>success === true<\/code>\uff09\u306e\u3068\u304d\u3001<code>output<\/code> \u306e\u578b\u304c\u6c7a\u307e\u308b<\/li>\n<li data-line=\"39\" class=\"code-line\">\u5931\u6557\uff08<code>success === false<\/code>\uff09\u306e\u3068\u304d\u3001<code>output<\/code> \u306e\u578b\u304c <code>unknown<\/code> \u306b\u306a\u308b\n<ul data-line=\"40\" class=\"code-line\">\n<li data-line=\"40\" class=\"code-line\">\u300c<code>output<\/code> \u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u5b58\u5728\u3057\u306a\u3044\u300d\u3068\u306f\u306a\u3089\u306a\u3044<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p data-line=\"42\" class=\"code-line\"><span class=\"embed-block zenn-embedded zenn-embedded-github\"><iframe id=\"zenn-embedded__420f390d19083\" src=\"https:\/\/embed.zenn.studio\/github#zenn-embedded__420f390d19083\" data-content=\"https%3A%2F%2Fgithub.com%2Fopen-circle%2Fvalibot%2Fblob%2Fdf7152ac637070c5ba1fd7685bd34fe614b57a51%2Flibrary%2Fsrc%2Fmethods%2FsafeParse%2Ftypes.ts%23L12-L41\" frameborder=\"0\" scrolling=\"no\" loading=\"lazy\"><\/iframe><\/span><a target=\"_blank\" href=\"https:\/\/github.com\/open-circle\/valibot\/blob\/df7152ac637070c5ba1fd7685bd34fe614b57a51\/library\/src\/methods\/safeParse\/types.ts#L12-L41\" style=\"display:none\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">https:\/\/github.com\/open-circle\/valibot\/blob\/df7152ac637070c5ba1fd7685bd34fe614b57a51\/library\/src\/methods\/safeParse\/types.ts#L12-L41<\/a><\/p>\n<p data-line=\"44\" class=\"code-line\">\u4eca\u56de\u306e\u3088\u3046\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u6642\u306e\u5229\u4fbf\u6027\u3092\u8003\u616e\u3057\u3066\u306e\u3053\u3068\u3067\u3059\u304b\u306d\u2026\uff1f\u5b9f\u969b\u306b\u3001 <code>age<\/code> \u306e\u3088\u3046\u306a\u500b\u5225\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u306f\u306a\u304f\u3001 <code>output<\/code> \u306e\u5185\u5bb9\u5168\u4f53\u3092\u6bd4\u8f03\u3057\u3055\u3048\u3059\u308c\u3070\u826f\u3044\u306a\u3089\u3001\u578b\u30a8\u30e9\u30fc\u3092\u8d77\u3053\u3055\u305a\u306b\u66f8\u3051\u307e\u3059\u3002<\/p>\n<p data-line=\"46\" class=\"code-line\">\u307e\u305f\u3001\u300c\u2705\ufe0f\u5b8c\u5168\u7248\u30b3\u30fc\u30c9\u300d\u306e\u3088\u3046\u306b\u3057\u3066\u578b\u30c1\u30a7\u30c3\u30af\u3092\u6709\u52b9\u5316\u3057\u305f\u3068\u3057\u3066\u3082\u3001\uff08<code>expect<\/code> \u306e\u5b9a\u7fa9\u304c\u3086\u308b\u3044\u306e\u3067\uff09\u578b\u30c1\u30a7\u30c3\u30af\u304c\u7279\u306b\u53b3\u3057\u304f\u306a\u308b\u308f\u3051\u3067\u3082\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p data-line=\"48\" class=\"code-line\">\u306a\u306e\u3067\u3001\u5b9f\u306f\u3001<code>safeParse<\/code> \u306f\u3001<code>unreachable<\/code> \u306e\u30e1\u30ea\u30c3\u30c8\u306e\u8aac\u660e\u306e\u305f\u3081\u306b\u306f\u5c11\u3057\u4e0d\u5b8c\u5168\u3067\u3059\u304c\u3001\u8ad6\u7406\u7684\u306b\u6b63\u3057\u3044\u4e3b\u5f35\u306e\u306f\u305a\u306a\u306e\u3067\u305d\u308c\u306b\u514d\u3058\u3066\u8a31\u3057\u3066\u304f\u3060\u3055\u3044\u3002\ud83d\ude47<\/p>\n<div class=\"code-block-container\" wp_automatic_readability=\"14\">\n<pre class=\"language-ts\"><code class=\"language-ts code-line\" data-line=\"50\">\n<span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> UserSchema <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">from<\/span> <span class=\"token string\">\".\/user\"<\/span><span class=\"token punctuation\">;<\/span>\n<span class=\"token keyword\">import<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">as<\/span> v <span class=\"token keyword\">from<\/span> <span class=\"token string\">\"valibot\"<\/span><span class=\"token punctuation\">;<\/span>\n\n<span class=\"token function\">it<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"should successfully parse a valid user\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=&gt;<\/span> <span class=\"token punctuation\">{<\/span>\n  <span class=\"token keyword\">const<\/span> user <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">{<\/span> name<span class=\"token operator\">:<\/span> <span class=\"token string\">\"John Doe\"<\/span><span class=\"token punctuation\">,<\/span> age<span class=\"token operator\">:<\/span> <span class=\"token number\">25<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span>\n  <span class=\"token keyword\">const<\/span> result <span class=\"token operator\">=<\/span> v<span class=\"token punctuation\">.<\/span><span class=\"token function\">safeParse<\/span><span class=\"token punctuation\">(<\/span>UserSchema<span class=\"token punctuation\">,<\/span> user<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n  <span class=\"token function\">expect<\/span><span class=\"token punctuation\">(<\/span>result<span class=\"token punctuation\">.<\/span>success<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toBe<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n\n  <span class=\"token function\">expect<\/span><span class=\"token punctuation\">(<\/span>result<span class=\"token punctuation\">.<\/span>output<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toEqual<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span> name<span class=\"token operator\">:<\/span> <span class=\"token string\">\"John Doe\"<\/span><span class=\"token punctuation\">,<\/span> age<span class=\"token operator\">:<\/span> <span class=\"token number\">25<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n  \n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n<\/code><\/pre>\n<\/div>\n<div class=\"code-block-container\" wp_automatic_readability=\"13\">\n<pre class=\"language-ts\"><code class=\"language-ts code-line\" data-line=\"65\">\n<span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> UserSchema <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">from<\/span> <span class=\"token string\">\".\/user\"<\/span><span class=\"token punctuation\">;<\/span>\n<span class=\"token keyword\">import<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">as<\/span> v <span class=\"token keyword\">from<\/span> <span class=\"token string\">\"valibot\"<\/span><span class=\"token punctuation\">;<\/span>\n\n<span class=\"token function\">it<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"should successfully parse a valid user\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=&gt;<\/span> <span class=\"token punctuation\">{<\/span>\n  <span class=\"token keyword\">const<\/span> user <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">{<\/span> name<span class=\"token operator\">:<\/span> <span class=\"token string\">\"John Doe\"<\/span><span class=\"token punctuation\">,<\/span> age<span class=\"token operator\">:<\/span> <span class=\"token number\">25<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span>\n  <span class=\"token keyword\">const<\/span> result <span class=\"token operator\">=<\/span> v<span class=\"token punctuation\">.<\/span><span class=\"token function\">safeParse<\/span><span class=\"token punctuation\">(<\/span>UserSchema<span class=\"token punctuation\">,<\/span> user<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n  <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>result<span class=\"token punctuation\">.<\/span>success<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\n    expect<span class=\"token punctuation\">.<\/span><span class=\"token function\">unreachable<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"Should not fail safeParse\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n  <span class=\"token punctuation\">}<\/span>\n  \n  <span class=\"token function\">expect<\/span><span class=\"token punctuation\">(<\/span>result<span class=\"token punctuation\">.<\/span>output<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toEqual<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span> name<span class=\"token operator\">:<\/span> <span class=\"token string\">\"John Doe\"<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n<\/code><\/pre>\n<\/div>\n<\/div>\n<\/details>\n<p data-line=\"82\" class=\"code-line\"><code>expect<\/code> \u3060\u3051\u3067\u306f\u578b\u304c\u7d5e\u308a\u8fbc\u307e\u308c\u306a\u3044\u305f\u3081\u3001<code>result.output<\/code> \u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u306f\u305a\u306a\u306e\u306b\u3001\u578b\u30c1\u30a7\u30c3\u30af\u3067\u507d\u967d\u6027\u306b\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n<p data-line=\"84\" class=\"code-line\"><strong>\u305d\u3053\u3067\u4f7f\u3048\u308b\u306e\u304c\u3001<a target=\"_blank\" href=\"https:\/\/vitest.dev\/api\/expect.html#expect-unreachable\" target=\"_blank\" rel=\"nofollow noopener noreferrer\"><code>expect.unreachable<\/code><\/a> \u3067\u3059\u3002<\/strong><\/p>\n<div class=\"code-block-container\" wp_automatic_readability=\"13\">\n<pre class=\"language-ts\"><code class=\"language-ts code-line\" data-line=\"86\">\n<span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> UserSchema <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">from<\/span> <span class=\"token string\">\".\/user\"<\/span><span class=\"token punctuation\">;<\/span>\n<span class=\"token keyword\">import<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">as<\/span> v <span class=\"token keyword\">from<\/span> <span class=\"token string\">\"valibot\"<\/span><span class=\"token punctuation\">;<\/span>\n\n<span class=\"token function\">it<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"should successfully parse a valid user\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=&gt;<\/span> <span class=\"token punctuation\">{<\/span>\n  <span class=\"token keyword\">const<\/span> user <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">{<\/span> name<span class=\"token operator\">:<\/span> <span class=\"token string\">\"John Doe\"<\/span><span class=\"token punctuation\">,<\/span> age<span class=\"token operator\">:<\/span> <span class=\"token number\">25<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span>\n  <span class=\"token keyword\">const<\/span> result <span class=\"token operator\">=<\/span> v<span class=\"token punctuation\">.<\/span><span class=\"token function\">safeParse<\/span><span class=\"token punctuation\">(<\/span>UserSchema<span class=\"token punctuation\">,<\/span> user<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n  <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>result<span class=\"token punctuation\">.<\/span>success<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\n    expect<span class=\"token punctuation\">.<\/span><span class=\"token function\">unreachable<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"Should not fail safeParse\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n  <span class=\"token punctuation\">}<\/span>\n  \n  <span class=\"token function\">expect<\/span><span class=\"token punctuation\">(<\/span>result<span class=\"token punctuation\">.<\/span>output<span class=\"token punctuation\">.<\/span>age<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toEqual<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">25<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n<\/code><\/pre>\n<\/div>\n<p data-line=\"102\" class=\"code-line\">\u30c6\u30b9\u30c8\u3092\u308f\u3056\u3068\u5931\u6557\u3055\u305b\u3066\u307f\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u51fa\u3057\u3066\u304f\u308c\u307e\u3059\u3002<\/p>\n<p data-line=\"104\" class=\"code-line\"><img decoding=\"async\" src=\"https:\/\/res.cloudinary.com\/zenn\/image\/fetch\/s--APbRuZwd--\/c_limit%2Cf_auto%2Cfl_progressive%2Cq_auto%2Cw_1200\/https:\/\/storage.googleapis.com\/zenn-user-upload\/deployed-images\/7ddf2bf7140b15e9ffc7e61a.png%3Fsha%3D21db4c262ebf7f664161c880815e67d24cc17ece\" alt=\" FAIL  src\/user.test.ts &gt; should successfully parse a valid user&#10;AssertionError: expected \" should=\"\" not=\"\" fail=\"\" safeparse\"=\"\" to=\"\" be=\"\" reached=\"\" &#10095;=\"\" user.test.ts:8:12\"=\"\" class=\"md-img\" loading=\"lazy\"\/><\/p>\n<p data-line=\"108\" class=\"code-line\">\u25bc \u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/p>\n<p data-line=\"110\" class=\"code-line\"><span class=\"embed-block zenn-embedded zenn-embedded-card\"><iframe id=\"zenn-embedded__899158eb3e23d\" src=\"https:\/\/embed.zenn.studio\/card#zenn-embedded__899158eb3e23d\" data-content=\"https%3A%2F%2Fvitest.dev%2Fapi%2Fexpect.html%23expect-unreachable\" frameborder=\"0\" scrolling=\"no\" loading=\"lazy\"><\/iframe><\/span><a target=\"_blank\" href=\"https:\/\/vitest.dev\/api\/expect.html#expect-unreachable\" style=\"display:none\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">https:\/\/vitest.dev\/api\/expect.html#expect-unreachable<\/a><\/p>\n<h2 id=\"assert-%E3%81%A8%E3%81%AE%E9%81%95%E3%81%84\" data-line=\"112\" class=\"code-line\">\n assert \u3068\u306e\u9055\u3044<\/h2>\n<p data-line=\"114\" class=\"code-line\">\u5b9f\u306f\u3001\u3053\u306e\u8a18\u4e8b\u3092\u66f8\u3044\u305f\u304d\u3063\u304b\u3051\u306b\u306a\u3063\u305f\u306e\u306f\u3001Vitest \u306e <code>assert<\/code> \u3092\u7d39\u4ecb\u3057\u3066\u3044\u308b\u4ee5\u4e0b\u306e\u8a18\u4e8b\u3067\u3059\u3002<\/p>\n<p data-line=\"116\" class=\"code-line\"><code>assert<\/code> \u3082 <code>expect.unreachable<\/code> \u3068\u540c\u69d8\u306b\u3001\u5230\u9054\u4e0d\u80fd\u30b3\u30fc\u30c9\u3092 TypeScript \u306b\u6559\u3048\u3066\u578b\u3092\u7d5e\u308a\u8fbc\u3080\u306e\u306b\u4f7f\u3048\u307e\u3059\u3002<\/p>\n<p data-line=\"118\" class=\"code-line\"><span class=\"embed-block zenn-embedded zenn-embedded-card\"><iframe id=\"zenn-embedded__d2b2783258f87\" src=\"https:\/\/embed.zenn.studio\/card#zenn-embedded__d2b2783258f87\" data-content=\"https%3A%2F%2Fzenn.dev%2Fapple_yagi%2Farticles%2F3fecd12aed68d5\" frameborder=\"0\" scrolling=\"no\" loading=\"lazy\"><\/iframe><\/span><a target=\"_blank\" href=\"https:\/\/zenn.dev\/apple_yagi\/articles\/3fecd12aed68d5\" style=\"display:none\" target=\"_blank\">https:\/\/zenn.dev\/apple_yagi\/articles\/3fecd12aed68d5<\/a><\/p>\n<p data-line=\"120\" class=\"code-line\">\u3069\u3061\u3089\u3082\u4f3c\u305f\u308a\u3088\u3063\u305f\u308a\u3067\u3059\u304c\u3001\u500b\u4eba\u7684\u306b <code>expect.unreachable<\/code> \u306b\u306f\u300c<strong>\u305f\u3060\u306e <code>if<\/code> \u6587\u3067\u3001\u30c6\u30b9\u30c8\u3067\u306a\u3044 Production \u30b3\u30fc\u30c9\u3068\u540c\u69d8\u306b\u66f8\u3051\u308b\u306e\u3067\u3001<code>assert<\/code> \u306e API \u306e\u77e5\u8b58\u304c\u4e0d\u8981<\/strong>\u300d\u3068\u3044\u3046\u5229\u70b9\u304c\u3042\u308b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<p data-line=\"122\" class=\"code-line\">\uff08\u3082\u3061\u308d\u3093\u300c\u30c6\u30b9\u30c8\u3092\u5168\u4f53\u7684\u306b <code>expect<\/code> \u3092\u4f7f\u3063\u3066\u66f8\u3044\u3066\u3044\u308b\u5834\u5408\u306b\u306f\u300d\u3068\u3044\u3046\u6761\u4ef6\u4ed8\u304d\u3067\u3059\u304c\u2026\uff09<\/p>\n<h2 id=\"q.%E3%81%A9%E3%82%93%E3%81%AA%E3%82%AB%E3%83%A9%E3%82%AF%E3%83%AA%E3%81%AB%E3%81%AA%E3%81%A3%E3%81%A6%E3%82%8B%E3%81%AE%EF%BC%9F-a.-never-%E5%9E%8B%E3%81%AB%E3%82%88%E3%82%8B%E5%A4%A7%E5%9F%9F%E8%84%B1%E5%87%BA%E3%81%AE%E6%98%8E%E7%A4%BA\" data-line=\"124\" class=\"code-line\">\n Q.\u3069\u3093\u306a\u30ab\u30e9\u30af\u30ea\u306b\u306a\u3063\u3066\u308b\u306e\uff1f A. <code>never<\/code> \u578b\u306b\u3088\u308b\u5927\u57df\u8131\u51fa\u306e\u660e\u793a<\/h2>\n<p data-line=\"126\" class=\"code-line\"><code>expect.unreachable<\/code> \u306e\u578b\u5b9a\u7fa9\u3092\u898b\u3066\u307f\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<div class=\"code-block-container\" wp_automatic_readability=\"7\">\n<pre class=\"language-ts\"><code class=\"language-ts code-line\" data-line=\"128\">\t<span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">ExpectStatic<\/span> <span class=\"token punctuation\">{<\/span>\n    \n\t\t<span class=\"token function-variable function\">unreachable<\/span><span class=\"token operator\">:<\/span> <span class=\"token punctuation\">(<\/span>message<span class=\"token operator\">?<\/span><span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=&gt;<\/span> <span class=\"token builtin\">never<\/span><span class=\"token punctuation\">;<\/span>\n<\/code><\/pre>\n<\/div>\n<p data-line=\"134\" class=\"code-line\">\u300c<code>never<\/code> \u3092\u8fd4\u3059\u300d\u3068\u3044\u3046\u898b\u6163\u308c\u306a\u3044\u30b7\u30b0\u30cd\u30c1\u30e3\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306a\u95a2\u6570\u3092\u547c\u3073\u51fa\u3059\u3068\u3001\u300c\u5927\u57df\u8131\u51fa\u300d\u3068\u3057\u3066 TypeScript \u306b\u8a8d\u8b58\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306b\u6761\u4ef6\u5206\u5c90\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u65e9\u671f\u30ea\u30bf\u30fc\u30f3\u306b\u3088\u308b\u578b\u30ac\u30fc\u30c9\u3068\u540c\u69d8\u306b\u3001\u578b\u306e\u7d5e\u308a\u8fbc\u307f\u304c\u3067\u304d\u3066\u3044\u308b\u3093\u3067\u3059\u306d\u3002<\/p>\n<p data-line=\"136\" class=\"code-line\"><span class=\"embed-block zenn-embedded zenn-embedded-card\"><iframe id=\"zenn-embedded__0643b0bac17b8\" src=\"https:\/\/embed.zenn.studio\/card#zenn-embedded__0643b0bac17b8\" data-content=\"https%3A%2F%2Ftypescriptbook.jp%2Freference%2Fstatements%2Fnever\" frameborder=\"0\" scrolling=\"no\" loading=\"lazy\"><\/iframe><\/span><a target=\"_blank\" href=\"https:\/\/typescriptbook.jp\/reference\/statements\/never\" style=\"display:none\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">https:\/\/typescriptbook.jp\/reference\/statements\/never<\/a><\/p>\n<p data-line=\"138\" class=\"code-line\">\u540c\u3058\u4ed5\u7d44\u307f\u3092\u4f7f\u3063\u305f\u4f8b\u3068\u3057\u3066: <a target=\"_blank\" href=\"https:\/\/nextjs.org\/docs\/app\/api-reference\/functions\/not-found\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">Next.js \u306e <code>notFound<\/code> \u95a2\u6570<\/a> \u304c\u3042\u308a\u307e\u3059\u3002\u4eca\u56de\u3068\u540c\u69d8\u3001\u6761\u4ef6\u5206\u5c90\u306e\u4e2d\u3067 <code>notFound<\/code> \u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u3067\u3001<\/p>\n<ul data-line=\"140\" class=\"code-line\">\n<li data-line=\"140\" class=\"code-line\">id \u304c undefined \u306e\u3068\u304d\u306f Not Found \u306e\u30a8\u30e9\u30fc\u3092\u898b\u305b\u308b<\/li>\n<li data-line=\"141\" class=\"code-line\">\u2192 \u305d\u3046\u3067\u306a\u3044\u5834\u5408\u306e\u5206\u5c90\u3067\u306f id \u304c undefined \u3067\u306a\u3044\u3053\u3068\u304c\u4fdd\u8a3c\u3055\u308c\u3066\u3044\u308b<\/li>\n<\/ul>\n<p data-line=\"143\" class=\"code-line\">\u3068\u3044\u3063\u305f\u578b\u30c1\u30a7\u30c3\u30af\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<div class=\"code-block-container\" wp_automatic_readability=\"9\">\n<pre class=\"language-tsx\"><code class=\"language-tsx code-line\" data-line=\"145\"><span class=\"token keyword\">import<\/span> <span class=\"token imports\"><span class=\"token punctuation\">{<\/span> notFound <span class=\"token punctuation\">}<\/span><\/span> <span class=\"token keyword\">from<\/span> <span class=\"token string\">'next\/navigation'<\/span>\n<span class=\"token keyword\">import<\/span> <span class=\"token imports\"><span class=\"token punctuation\">{<\/span> fetchUser <span class=\"token punctuation\">}<\/span><\/span> <span class=\"token keyword\">from<\/span> <span class=\"token string\">'.\/fetch-user'<\/span>\n \n<span class=\"token keyword\">export<\/span> <span class=\"token keyword\">default<\/span> <span class=\"token keyword\">async<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token function\">Profile<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span> params <span class=\"token punctuation\">}<\/span><span class=\"token operator\">:<\/span> <span class=\"token maybe-class-name\">PageProps<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token string\">'\/users\/[id]'<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\n  <span class=\"token keyword\">const<\/span> <span class=\"token punctuation\">{<\/span> id <span class=\"token punctuation\">}<\/span> <span class=\"token operator\">=<\/span> <span class=\"token keyword\">await<\/span> params\n  <span class=\"token keyword\">const<\/span> user <span class=\"token operator\">=<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">fetchUser<\/span><span class=\"token punctuation\">(<\/span>id<span class=\"token punctuation\">)<\/span>\n  \n  <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>user<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\n    <span class=\"token function\">notFound<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>\n  <span class=\"token punctuation\">}<\/span>\n \n  \n<span class=\"token punctuation\">}<\/span>\n<\/code><\/pre>\n<\/div>\n<p data-line=\"161\" class=\"code-line\">\u4ee5\u4e0a\u3002<\/p>\n<\/div>\n\n<br \/><a href=\"https:\/\/zenn.dev\/yumemi_inc\/articles\/vitest-expect-unreachable\">\u5143\u306e\u8a18\u4e8b\u3092\u78ba\u8a8d\u3059\u308b <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"! \u3053\u306e\u8a18\u4e8b\u306f\u3001Qiita \u306e TypeScript Advent Calendar 2025 \u306e 2025-12-08 \u6295\u7a3f\u5206\u3067\u3059\u3002 expect.unreachable\u3001\u304b\u306a\u308a\u4fbf\u5229 Zod \u3084 Valibot \u306a\u3069\u3067 [&hellip;]","protected":false},"author":1,"featured_media":26857,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-26856","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-company-tec"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Vitest \u306e expect.unreachable \u3067\u6761\u4ef6\u5206\u5c90\u3092\u4f34\u3046\u30c6\u30b9\u30c8\u3067\u578b\u3092\u7d5e\u308a\u8fbc\u3081\u308b - \u30dd\u30b1\u30b3\u30f3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/zenn.dev\/yumemi_inc\/articles\/vitest-expect-unreachable\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Vitest \u306e expect.unreachable \u3067\u6761\u4ef6\u5206\u5c90\u3092\u4f34\u3046\u30c6\u30b9\u30c8\u3067\u578b\u3092\u7d5e\u308a\u8fbc\u3081\u308b - \u30dd\u30b1\u30b3\u30f3\" \/>\n<meta property=\"og:description\" content=\"! \u3053\u306e\u8a18\u4e8b\u306f\u3001Qiita \u306e TypeScript Advent Calendar 2025 \u306e 2025-12-08 \u6295\u7a3f\u5206\u3067\u3059\u3002 expect.unreachable\u3001\u304b\u306a\u308a\u4fbf\u5229 Zod \u3084 Valibot \u306a\u3069\u3067 [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/zenn.dev\/yumemi_inc\/articles\/vitest-expect-unreachable\" \/>\n<meta property=\"og:site_name\" content=\"\u30dd\u30b1\u30b3\u30f3\" \/>\n<meta property=\"article:published_time\" content=\"2025-12-07T15:29:41+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/pokecon.jp\/job\/wp-content\/uploads\/2025\/12\/1765121379_og-base-w1200-v2.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"630\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"info@pokecon.jp\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u57f7\u7b46\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"info@pokecon.jp\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u63a8\u5b9a\u8aad\u307f\u53d6\u308a\u6642\u9593\" \/>\n\t<meta name=\"twitter:data2\" content=\"2\u5206\" \/>\n<script type=\"application\/ld+json\" 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\u3067\u6761\u4ef6\u5206\u5c90\u3092\u4f34\u3046\u30c6\u30b9\u30c8\u3067\u578b\u3092\u7d5e\u308a\u8fbc\u3081\u308b\",\"datePublished\":\"2025-12-07T15:29:41+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/pokecon.jp\\\/job\\\/26856\\\/\"},\"wordCount\":80,\"image\":{\"@id\":\"https:\\\/\\\/zenn.dev\\\/yumemi_inc\\\/articles\\\/vitest-expect-unreachable#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/pokecon.jp\\\/job\\\/wp-content\\\/uploads\\\/2025\\\/12\\\/1765121379_og-base-w1200-v2.png\",\"articleSection\":[\"\u4f01\u696d\u30c6\u30c3\u30af\"],\"inLanguage\":\"ja\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/pokecon.jp\\\/job\\\/26856\\\/\",\"url\":\"https:\\\/\\\/zenn.dev\\\/yumemi_inc\\\/articles\\\/vitest-expect-unreachable\",\"name\":\"Vitest \u306e expect.unreachable \u3067\u6761\u4ef6\u5206\u5c90\u3092\u4f34\u3046\u30c6\u30b9\u30c8\u3067\u578b\u3092\u7d5e\u308a\u8fbc\u3081\u308b - 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