{"id":256,"date":"2016-03-25T18:00:00","date_gmt":"2016-03-25T09:00:00","guid":{"rendered":"https:\/\/p-corporate-blog-cms.mmmcorp.co.jp\/blog\/2016\/03\/25\/static-type-check-with-flow-type"},"modified":"2016-03-25T18:00:00","modified_gmt":"2016-03-25T09:00:00","slug":"static-type-check-with-flow-type","status":"publish","type":"post","link":"https:\/\/p-corporate-blog-cms.mmmcorp.co.jp\/blog\/2016\/03\/25\/static-type-check-with-flow-type\/","title":{"rendered":"Flowtype\u306b\u5165\u9580\u3057\u3066JavaScript\u30b3\u30fc\u30c9\u3067\u9759\u7684\u578b\u4ed8\u3051\u306e\u6069\u6075\u3092\u3046\u3051\u308b\u3068\u3053\u308d\u307e\u3067"},"content":{"rendered":"<p><a href=\"http:\/\/house-of-cards.jp\/\">\u30cf\u30a6\u30b9\u30fb\u30aa\u30d6\u30fb\u30ab\u30fc\u30c9<\/a>\u3067\u5bdd\u4e0d\u8db3\u306e\u5c0f\u98fc\u3067\u3059\u3002<br \/>\n\u3069\u3046\u306a\u308b\u3093\u3067\u3059\u304b\u3001\u3042\u306e\u30a2\u30ec\u306f...<\/p>\n<p><img src=\"\/images\/static-type-check-with-flow-type\/flow-hero-logo.png\" alt=\"\"><\/p>\n<p>\u3055\u3066\u3001\u6700\u8fd1\u500b\u4eba\u7684\u306b<code>Golang<\/code>\u3067\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u4f5c\u3063\u305f\u308a\u3001<code>Haskell<\/code>\u3092\u52c9\u5f37\u3057\u305f\u308a\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n\u3044\u305a\u308c\u3082<a href=\"https:\/\/ja.wikipedia.org\/wiki\/%E9%9D%99%E7%9A%84%E5%9E%8B%E4%BB%98%E3%81%91\">\u9759\u7684\u578b\u4ed8\u3051<\/a>\u306b\u3088\u308a\u3001\u5b9f\u884c\u524d\u306b\u578b\u30a8\u30e9\u30fc\u3092\u691c\u51fa\u53ef\u80fd\u306a\u8a00\u8a9e\u3067\u3059\u3002<br \/>\n\u79c1\u306f\u666e\u6bb5\u3001\u52d5\u7684\u578b\u4ed8\u3051\u8a00\u8a9e\u3067\u3042\u308b<code>JavaScript<\/code>\u3092\u4e3b\u306b\u66f8\u3044\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u521d\u3081\u3053\u305d\u30d3\u30eb\u30c9\u6642\u306e\u30a8\u30e9\u30fc\u306b\u30e4\u30ad\u30e2\u30ad\u3057\u305f\u308a\u3057\u307e\u3057\u305f\u304c\u3001\u6163\u308c\u3066\u304f\u308b\u3068\u975e\u5e38\u306b\u5feb\u9069\u306b\u611f\u3058\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<p>\u5b9f\u884c\u6642\u306b\u691c\u51fa\u3055\u308c\u308b\u3064\u307e\u3089\u306a\u3044\u9593\u9055\u3044\u3084\u3001\u9593\u9055\u3063\u305f\u578b\u304c\u6e21\u3063\u3066\u304d\u305f\u6642\u306e\u9632\u5fa1\u30b3\u30fc\u30c9(<code>if typeof variable !== &#39;string&#39; console.warn(&#39;\u578b\u304c\u9055\u3046&#39;)<\/code>\u306e\u3088\u3046\u306a\u30b3\u30fc\u30c9)\u304c\u4e0d\u8981\u306b\u306a\u308b\u3053\u3068\u4ee5\u5916\u306b\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u56fa\u6709\u306e\u30c7\u30fc\u30bf\u69cb\u9020\u3092\u578b\u3068\u3057\u3066\u5ba3\u8a00\u3059\u308b\u3053\u3068\u3067\u3001<code>\u4f55\u3092\u3059\u308b\u304b<\/code>\u3088\u308a\u3082<code>\u4f55\u3067\u3042\u308b\u304b<\/code>\u306b\u6ce8\u76ee\u3057\u305f\u8aad\u307f\u3084\u3059\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u53ef\u80fd\u306b\u306a\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n<p><code>React.js<\/code>\u306b\u306f<code>PropType<\/code>\u3068\u3044\u3046\u578b\u30b7\u30b9\u30c6\u30e0\u3092\u5302\u308f\u305b\u308b\u3088\u3046\u306a\u4ed5\u7d44\u307f\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u5b9f\u884c\u6642\u306e\u578b\u30a8\u30e9\u30fc\u691c\u51fa\u3067\u3059\u3057\u3001\u30ab\u30b9\u30bf\u30e0\u578b(\u306e\u3088\u3046\u306a\u3082\u306e)\u306f\u72ec\u81ea\u306e\u578b\u691c\u8a3c\u95a2\u6570\u3092\u7528\u610f\u3059\u308b\u3088\u3046\u306a\u3082\u306e\u3067\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u767b\u5834\u4eba\u7269\u3092\u5ba3\u8a00\u3059\u308b\u3088\u306a\u4f7f\u3044\u65b9\u306f\u96e3\u3057\u304f\u3001\u4e0a\u8a18\u306e\u3088\u3046\u306a\u30e1\u30ea\u30c3\u30c8\u306f\u53d7\u3051\u306b\u304f\u3044\u5370\u8c61\u3067\u3059\u3002<\/p>\n<p>\u73fe\u5728<code>JavaScript<\/code>\u754c\u9688\u3067\u9759\u7684\u578b\u4ed8\u3051\u3092\u5c0e\u5165\u3059\u308b\u3068\u3057\u305f\u3089\u3001\u4ee5\u4e0b\u306e2\u3064\u306e\u30e9\u30a4\u30d6\u30e9\u30ea(\u30c8\u30e9\u30f3\u30b9\u30b3\u30f3\u30d1\u30a4\u30e9)\u304c\u30e1\u30b8\u30e3\u30fc\u306a\u9078\u629e\u80a2\u306a\u306e\u3067\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b<br \/>\n(<code>elm<\/code>\u306b\u3082\u9759\u7684\u578b\u4ed8\u3051\u306f\u3042\u308b\u3088\u3046\u3067\u3059\u304c\u3001\u30e1\u30b8\u30e3\u30fc\u306a\u9078\u629e\u80a2\u3068\u3057\u3066\u53d6\u308a\u5f97\u308b\u304b?\u3068\u3044\u3046\u3068...)<\/p>\n<ul>\n<li>TypeScript<\/li>\n<li>Flow<\/li>\n<\/ul>\n<p><code>Angular2.x~<\/code>\u306e\u57fa\u76e4\u3068\u306a\u3063\u3066\u3044\u308b<code>TypeScript<\/code>\u3082\u6c17\u306b\u306a\u308b\u3068\u3053\u308d\u3067\u306f\u3042\u308a\u307e\u3059\u304c\u3001\u672c\u7a3f\u3067\u306f\u8efd\u3081\u306b\u59cb\u3081\u3089\u308c\u308b\u3068\u5642\u306e<code>Flow<\/code>\u3092\u6271\u3063\u3066\u307f\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<p>\u4eca\u56de\u306f<code>Github-API<\/code>\u304b\u3089\u30e6\u30fc\u30b6\u306e\u30ea\u30b9\u30c8\u3092\u53d6\u3063\u3066\u304d\u3066\u3001\u30e6\u30fc\u30b6\u306e\u30b5\u30e0\u30cd\u30a4\u30eb\u3068\u540d\u524d\u3092\u63cf\u753b\u3059\u308b\u3001\u7c21\u5358\u306a\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<br \/>\n\u6b21\u306b\u3053\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3078\u5b9f\u969b\u306b<code>Flow<\/code>\u3092\u9069\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u9759\u7684\u578b\u4ed8\u3051\u306e\u30e1\u30ea\u30c3\u30c8\u304c\u5f97\u3089\u308c\u308b\u304b\u3092\u691c\u8a3c\u3057\u3066\u307f\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u3093\u306a\u611f\u3058\u306e\u7c21\u5358\u306a\u3082\u306e\u3067\u3059<br \/>\n<img src=\"\/images\/static-type-check-with-flow-type\/sample.png\" alt=\"\u30b5\u30f3\u30d7\u30eb\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\"><\/p>\n<h2 id=\"outline__1\" id=\"\u52d5\u7684\u578b\u4ed8\u3051\u306e\u30b5\u30f3\u30d7\u30eb\">\u52d5\u7684\u578b\u4ed8\u3051\u306e\u30b5\u30f3\u30d7\u30eb<\/h2>\n<p>\u307e\u305a<code>Flow<\/code>\u3092\u5c0e\u5165\u3057\u306a\u3044\u72b6\u614b\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<br \/>\n\u8a71\u3092\u7c21\u5358\u306b\u3059\u308b\u305f\u3081\u306b\u3001<code>Flux<\/code>\u7cfb\u306e\u4f55\u3084\u304b\u3084\u306f\u4f7f\u308f\u305a\u306b\u3001\u5b9f\u76f4\u306a<code>Props<\/code>\u30d0\u30b1\u30c4\u30ea\u30ec\u30fc\u306b\u3088\u308a\u30c7\u30fc\u30bf\u3092\u4f1d\u64ad\u3055\u305b\u307e\u3059\u3002<br \/>\n(\u5b9f\u884c\u6642\u306e\u578b\u30a8\u30e9\u30fc\u691c\u51fa\u306b\u3088\u308b\u6069\u6075\u306f\u3001\u672c\u7a3f\u306e\u4e3b\u984c\u304b\u3089\u5916\u308c\u308b\u305f\u3081<code>PropType<\/code>\u306e\u5ba3\u8a00\u3082\u3057\u307e\u305b\u3093)<\/p>\n<pre><code class=\"language-js\">import React, { Component } from &#39;react&#39;;\nimport ReactDOM from &#39;react-dom&#39;;\nimport &#39;whatwg-fetch&#39;;\n\nclass Root extends Component {\n  constructor() {\n    super()\n    this.state = {\n      users: []\n    }\n  }\n  componentWillMount() {\n    fetch(&#39;https:\/\/api.github.com\/users&#39;)\n    .then(r=&gt; r.json())\n    .then(r=&gt; this.setState({\n      users: j.map(u=&gt; ({\n        name: u.login,\n        img: u.avatar_url,\n      })),\n    }))\n    .catch(e=&gt; console.log(e))\n  }\n  render() {\n    return &lt;Users users={this.state.users}\/&gt;\n  }\n}\n\nclass Users extends Component {\n  constructor() {\n    super()\n  }\n  render() {\n    return &lt;ul&gt;{this.props.users.map((user, i)=&gt; &lt;User key={i} user={user}\/&gt;)}&lt;\/ul&gt;\n  }\n}\n\nclass User extends Component {\n  constructor() {\n    super()\n  }\n  render() {\n    const { user } = this.props;\n    return (\n      &lt;li&gt;\n        &lt;a href={`https:\/\/github.com\/${user.name}`}&gt;&lt;img src={user.img} alt={user.name} \/&gt;&lt;\/a&gt;\n        {user.name}\n      &lt;\/li&gt;\n    )\n  }\n}\n\nReactDOM.render(&lt;Root \/&gt;, document.querySelector(&#39;#root&#39;))<\/code><\/pre>\n<p>\u7279\u306b\u96e3\u3057\u3044\u3053\u3068\u306f\u3057\u3066\u3044\u306a\u3044\u3068\u601d\u3044\u307e\u3059\u3002<br \/>\n<code>Root<\/code>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u30e6\u30fc\u30b6\u4e00\u89a7\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u6e21\u3057\u3066\u3001\u63cf\u753b\u3059\u308b\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u3059\u3002<br \/>\n\u3053\u3053\u306b<code>Flow<\/code>\u306b\u3088\u308b\u9759\u7684\u578b\u4ed8\u3051\u3092\u5c0e\u5165\u3057\u3066\u3044\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<h2 id=\"outline__2\" id=\"\u5c0e\u5165\u6e96\u5099\">\u5c0e\u5165\u6e96\u5099<\/h2>\n<p><a href=\"http:\/\/flowtype.org\/docs\/getting-started.html\">\u516c\u5f0f\u306e\u624b\u9806<\/a>\u3092\u53c2\u8003\u306b\u5c0e\u5165\u3057\u307e\u3059\u3002<br \/>\n<code>Flow<\/code>\u306e\u7279\u5fb4\u3068\u3057\u3066<code>CLI\u30c4\u30fc\u30eb\u306b\u3088\u308b\u578b\u691c\u67fb<\/code>\u3068<code>\u30d3\u30eb\u30c9\u6642\u306e\u578b\u5ba3\u8a00\u9664\u53bb<\/code>\u306b\u3088\u3063\u3066\u3001\u9759\u7684\u306a\u578b\u691c\u67fb\u3092\u3057\u3064\u3064\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u5b9f\u884c\u6642\u306b\u306f\u578b\u5ba3\u8a00\u306e\u5f71\u97ff\u3092\u6301\u305f\u306a\u3044\u3053\u3068\u304c\u6319\u3052\u3089\u308c\u307e\u3059\u3002<br \/>\n\u3053\u308c\u306b\u3088\u3063\u3066\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u4efb\u610f\u306e\u7b87\u6240\u304b\u3089\u6bb5\u968e\u7684\u306b\u578b\u5ba3\u8a00\u306e\u6069\u6075\u3092\u5c0e\u5165\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3001\u3068\u3044\u3046\u30b3\u30f3\u30bb\u30d7\u30c8\u306e\u3088\u3046\u3067\u3059\u3002<\/p>\n<blockquote>\n<p>Flow is a static type checker, designed to quickly find errors in JavaScript applications:<br \/>\nFlow is a gradual type system. Any parts of your program that are dynamic in nature can easily bypass the type checker, so you can mix statically typed code with dynamic code.<\/p>\n<\/blockquote>\n<p>\u5f93\u3063\u3066\u3001<code>\u578b\u691c\u67fb\u306e\u305f\u3081\u306e\u30e2\u30b8\u30e5\u30fc\u30eb<\/code>\u3068<code>\u578b\u5ba3\u8a00\u9664\u53bb\u306e\u305f\u3081\u306e\u30e2\u30b8\u30e5\u30fc\u30eb<\/code>\u306e2\u7a2e\u985e\u306e\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-bash\"># \u578b\u691c\u67fb\u306e\u305f\u3081\u306e\u30e2\u30b8\u30e5\u30fc\u30eb(Flow\u306e\u672c\u4f53\u3068\u30b3\u30de\u30f3\u30c9\u30e9\u30a4\u30f3\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9)\nnpm install --save flowtype flow-bin\n\n# babel\u306b\u3088\u308b\u30d3\u30eb\u30c9\u6642\u306b\u578b\u5ba3\u8a00\u3092\u9664\u53bb\u3059\u308b\u305f\u3081\u306e\u30d7\u30e9\u30b0\u30a4\u30f3\nnpm install --save babel-plugin-transform-flow-strip-types<\/code><\/pre>\n<p>\u30b7\u30f3\u30d7\u30eb\u306b<code>babel<\/code>+<code>browserify<\/code>\u3067\u30d3\u30eb\u30c9\u3059\u308b\u60f3\u5b9a\u3067\u3001\u4f9d\u5b58\u30e2\u30b8\u30e5\u30fc\u30eb\u306f\u3053\u3093\u306a\u611f\u3058\u306b\u3057\u307e\u3057\u305f\u3002<\/p>\n<pre><code class=\"language-json\">{\n  &quot;babel&quot;: &quot;^6.5.2&quot;,\n  &quot;babel-plugin-transform-flow-strip-types&quot;: &quot;^6.7.0&quot;,\n  &quot;babel-plugin-transform-react-jsx&quot;: &quot;^6.7.4&quot;,\n  &quot;babel-plugin-transform-class-properties&quot;: &quot;^6.6.0&quot;,\n  &quot;babel-preset-es2015&quot;: &quot;^6.6.0&quot;,\n  &quot;babelify&quot;: &quot;^7.2.0&quot;,\n  &quot;browserify&quot;: &quot;^13.0.0&quot;,\n  &quot;flow-bin&quot;: &quot;^0.22.1&quot;,\n  &quot;flowtype&quot;: &quot;^1.0.0&quot;,\n  &quot;react&quot;: &quot;^0.14.7&quot;,\n  &quot;react-dom&quot;: &quot;^0.14.7&quot;,\n  &quot;whatwg-fetch&quot;: &quot;^0.11.0&quot;\n}<\/code><\/pre>\n<p><code>.babelrc<\/code>\u306e\u8a2d\u5b9a\u306f\u3053\u3093\u306a\u611f\u3058\u3067\u3059<\/p>\n<pre><code class=\"language-json\">\n{\n  &quot;presets&quot;: [\n    &quot;es2015&quot;\n  ],\n  &quot;plugins&quot;: [\n    &quot;transform-react-jsx&quot;,\n    &quot;transform-class-properties&quot;,\n    &quot;transform-flow-strip-types&quot;\n  ]\n}<\/code><\/pre>\n<p>\u203b <a href=\"https:\/\/github.com\/jeffmo\/es-class-fields-and-static-properties\">ES Class Fields<\/a>\u3067<code>props\/state<\/code>\u306e\u578b\u691c\u67fb\u3092\u884c\u3044\u305f\u3044\u306e\u3067\u3001<code>[babel-plugin-transform-class-properties](https:\/\/www.npmjs.com\/package\/babel-plugin-transform-class-properties)<\/code>\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u5404\u7a2e\u30b9\u30af\u30ea\u30d7\u30c8\u306f\u3053\u3093\u306a\u611f\u3058\u3067\u3001<code>npm run flow<\/code>\u3067\u578b\u691c\u67fb\u3092\u3001<code>npm run browserify<\/code>\u3067\u30d3\u30eb\u30c9\u3092\u305d\u308c\u305e\u308c\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-json\">{\n  &quot;flow&quot;: &quot;$(npm bin)\/flow&quot;,\n  &quot;browserify&quot;: &quot;$(npm bin)\/browserify app.js -t babelify -o bundle.js&quot;,\n  &quot;build&quot;: &quot;npm run flow &amp;&amp; npm run browserify&quot;\n}<\/code><\/pre>\n<p><code>Flow<\/code>\u7528\u306e\u8a2d\u5b9a\u30d5\u30a1\u30a4\u30eb<code>.flowconfig<\/code>\u3092\u3001<a href=\"http:\/\/flowtype.org\/docs\/new-project.html\">\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306e\u624b\u9806<\/a>\u3092\u53c2\u8003\u306b\u751f\u6210\u3057\u3066\u3001\u578b\u691c\u67fb\u306e\u5bfe\u8c61\u30d5\u30a1\u30a4\u30eb\u306b<code>@flow<\/code>\u3092\u30b3\u30e1\u30f3\u30c8\u30a2\u30a6\u30c8\u3057\u3066\u8a18\u8ff0\u3057\u307e\u3059\u3002<br \/>\n\u30c7\u30d5\u30a9\u30eb\u30c8\u3060\u3068<code>node_modules<\/code>\u3082\u691c\u67fb\u3057\u306b\u884c\u3063\u3066\u3057\u307e\u3046\u306e\u3067\u3001\u8a2d\u5b9a\u30d5\u30a1\u30a4\u30eb\u306e<code>[ignore]<\/code>\u306b\u66f8\u3044\u3066\u304a\u3044\u305f\u65b9\u304c\u3044\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<pre><code>[ignore]\nbundle.js\n.*\/node_modules\/fbjs\/*\n[include]\n\n[libs]\ndeclare.js\n[options]\nesproposal.class_instance_fields=enable\nesproposal.class_static_fields=enable<\/code><\/pre>\n<h2 id=\"outline__3\" id=\"\u72ec\u81ea\u578b\u306e\u30c7\u30b6\u30a4\u30f3\">\u72ec\u81ea\u578b\u306e\u30c7\u30b6\u30a4\u30f3<\/h2>\n<p>\u6e96\u5099\u304c\u6574\u3063\u305f\u306e\u3067\u3001\u30b5\u30f3\u30d7\u30eb\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u9759\u7684\u578b\u4ed8\u3051\u3063\u307d\u304f\u30c7\u30b6\u30a4\u30f3\u3057\u306a\u304a\u3057\u3066\u307f\u307e\u3059\u3002<br \/>\n\u3053\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u767b\u5834\u3059\u308b\u4e3b\u306a\u30c7\u30fc\u30bf\u578b\u306b\u306f<code>\u30e6\u30fc\u30b6\u306e\u540d\u524d\u3068\u753b\u50cf\u3092\u6301\u3063\u305f\u30c7\u30fc\u30bf<\/code>\u3068<code>\u30e6\u30fc\u30b6\u306e\u914d\u5217<\/code>\u304c\u3042\u308b\u3088\u3046\u3067\u3059\u306e\u3067\u3001\u3053\u3093\u306a\u611f\u3058\u3067\u5ba3\u8a00\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-js\">\/\/ \u30e6\u30fc\u30b6\u306e\u540d\u524d\u3068\u753b\u50cf\u3092\u6301\u3063\u305f\u30c7\u30fc\u30bf\u578b\ntype TypeUser = {\n  name: string;\n  img: string;\n}\n\n\/\/ \u30e6\u30fc\u30b6\u306e\u914d\u5217\ntype TypeUsers = Array&lt;TypeUser&gt;;<\/code><\/pre>\n<p>\u6b21\u306b\u5b9f\u969b\u306b\u578b\u691c\u67fb\u3092\u3057\u3066\u307f\u307e\u3059\u3002<br \/>\nTypeUser\u578b\u306fUser\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e<code>props<\/code>\u3068\u3057\u3066\u4f7f\u308f\u308c\u307e\u3059\u306e\u3067\u3001User\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e<code>props<\/code>\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u578b\u6307\u5b9a\u3092\u3057\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-js\">class User extends Component {\n  props: {\n    user: TypeUser;\n  };\n  static defaultProps = {\n    user: { name: &#39;&#39;, img: &#39;&#39; },\n  };\n  \/*... *\/\n}<\/code><\/pre>\n<p>\u3053\u308c\u3067User\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u6e21\u305b\u308b\u30c7\u30fc\u30bf\u306f\u3001TypeUser\u578b\u3060\u3051\u306b\u306a\u3063\u305f\u306f\u305a\u3067\u3059\u3002<br \/>\n<code>npm run flow<\/code>\u3067\u578b\u691c\u67fb\u3092\u3057\u3066\u307f\u308b\u3068\u3001<code>No errors!<\/code>\u3068\u8868\u793a\u3055\u308c\u308b\u306f\u305a\u3067\u3059\u3002<\/p>\n<p>\u78ba\u8a8d\u306e\u305f\u3081\u3001\u9593\u9055\u3063\u305f\u30c7\u30fc\u30bf\u578b\u3092\u6e21\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<br \/>\n<code>TypeUser\u578b<\/code>\u304c\u6301\u3063\u3066\u3044\u308b\u306f\u305a\u306e<code>name\/img<\/code>\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u3044\u305a\u308c\u3082\u6301\u3063\u3066\u3044\u306a\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6e21\u3057\u3066\u307f\u307e\u3059<\/p>\n<pre><code class=\"language-js\">class Users extends Component {\n  \/*... *\/\n  render() {\n    \/\/ return &lt;ul&gt;{this.props.users.map((user, i)=&gt; &lt;User key={i} id={i} user={user}\/&gt;)}&lt;\/ul&gt;\n    return &lt;ul&gt;{[{noname: &#39;&#39;, noimg: &#39;&#39;}].map((user, i)=&gt; &lt;User key={i} user={user}\/&gt;)}&lt;\/ul&gt;\n  }\n}<\/code><\/pre>\n<pre><code>app.js:57\n 57:   user: TypeUser;\n             ^^^^^^^^ property `img`. Property not found in\n 53:   render = ()=&gt; (&lt;ul&gt;{[{noname: &#39;&#39;, noimg: &#39;&#39;}].map((u, i)=&gt; &lt;User key={i} user={u}\/&gt;)}&lt;\/ul&gt;);\n                                                                                      ^ object literal\n\napp.js:57\n 57:   user: TypeUser;\n             ^^^^^^^^ property `name`. Property not found in\n 53:   render = ()=&gt; (&lt;ul&gt;{[{noname: &#39;&#39;, noimg: &#39;&#39;}].map((u, i)=&gt; &lt;User key={i} user={u}\/&gt;)}&lt;\/ul&gt;);\n                                                                                      ^ object literal\n\n\nFound 2 errors<\/code><\/pre>\n<p>\u3042\u308b\u3079\u304d\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u7121\u3044\u3053\u3068\u3092\u8b66\u544a\u3057\u3066\u304f\u308c\u307e\u3057\u305f\uff01<br \/>\n\u30d6\u30e9\u30a6\u30b6\u3067\u5b9f\u884c\u3059\u308b\u524d\u306b\u578b\u30a8\u30e9\u30fc\u3092\u691c\u51fa\u3057\u3066\u304f\u308c\u308b\u306e\u3067\u3001\u5b89\u5fc3\u3057\u3066\u958b\u767a\u304c\u3067\u304d\u305d\u3046\u3067\u3059<\/p>\n<p>\u540c\u3058\u3088\u3046\u306b\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u5404\u6240\u3067\u5fc5\u8981\u306a\u578b\u3092\u66f8\u3044\u3066\u3044\u304d\u3001\u6700\u7d42\u5f62\u306f\u3053\u3093\u306a\u611f\u3058\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<pre><code class=\"language-js\">\/\/ @flow\nimport React, { Component } from &#39;react&#39;;\nimport ReactDOM from &#39;react-dom&#39;;\nimport &#39;whatwg-fetch&#39;;\n\ntype TypeUser = {\n  name: string;\n  img: string;\n}\n\ntype UsersType = Array&lt;TypeUser&gt;;\n\nclass Root extends Component {\n  state: {\n    users: UsersType\n  };\n  constructor() {\n    super()\n    this.state = {\n      users: [],\n    }\n  }\n  componentWillMount() {\n    fetch(&#39;https:\/\/api.github.com\/users&#39;)\n    .then(r=&gt; r.json())\n    .then(j=&gt; {\n      this.setState({\n        users: j.map((u): TypeUser =&gt; ({\n          name: u.login,\n          img: u.avatar_url,\n        })),\n      })\n    })\n    .catch(e=&gt; console.log(e))\n  }\n  render() {\n    return &lt;Users users={this.state.users}\/&gt;\n  }\n}\n\nclass Users extends Component {\n  props: {\n    users: UsersType;\n  };\n  static defaultProps = {\n    users: []\n  };\n  constructor() {\n    super()\n  }\n  render() {\n    return &lt;ul&gt;{this.props.users.map((user, i)=&gt; &lt;User key={i} user={user}\/&gt;)}&lt;\/ul&gt;\n  }\n}\n\nclass User extends Component {\n  props: {\n    user: TypeUser;\n  };\n  static defaultProps = {\n    user: { name: &#39;&#39;, img: &#39;&#39; },\n  };\n  constructor() {\n    super()\n  }\n  render() {\n    const { user } = this.props;\n    return (\n      &lt;li&gt;\n        &lt;a href={`https:\/\/github.com\/${user.name}`}&gt;&lt;img src={user.img} alt={user.name} \/&gt;&lt;\/a&gt;\n        {user.name}\n      &lt;\/li&gt;\n    )\n  }\n}\n\nReactDOM.render(&lt;Root \/&gt;, document.querySelector(&#39;#root&#39;))<\/code><\/pre>\n<p>\u3053\u306e\u72b6\u614b\u3067<code>npm run browserify<\/code>\u30b3\u30de\u30f3\u30c9\u3092\u6253\u3064\u3068\u3001<code>transform-flow-strip-types<\/code>\u304c\u578b\u5ba3\u8a00\u3092\u9664\u53bb\u3057\u3066\u304b\u3089<code>bundle<\/code>\u30d5\u30a1\u30a4\u30eb\u3092\u751f\u6210\u3067\u304d\u307e\u3059\u3002<br \/>\n\u9759\u7684\u578b\u4ed8\u3051\u306e\u6069\u6075\u3092\u53d7\u3051\u3064\u3064\u3001\u5b9f\u884c\u30b3\u30fc\u30c9\u306b\u306f\u5f71\u97ff\u304c\u7121\u3044\u306e\u304c\u826f\u3044\u3067\u3059\u306d\u3002<\/p>\n<h2 id=\"outline__4\" id=\"\u307e\u3068\u3081\">\u307e\u3068\u3081<\/h2>\n<p>\u9759\u7684\u578b\u4ed8\u3051\u6700\u9ad8\u3068\u3044\u3046\u601d\u3044\u304b\u3089<code>Flow<\/code>\u3092\u8a66\u3057\u3066\u307f\u307e\u3057\u305f\u304c\u3044\u304b\u304c\u3060\u3063\u305f\u3067\u3057\u3087\u3046\u304b\u3002<br \/>\n\u65e2\u5b58\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u4efb\u610f\u306e\u7b87\u6240\u304b\u3089\u3001<code>lint<\/code>\u30c4\u30fc\u30eb\u306e\u3088\u3046\u306b\u5c0f\u3055\u304f\u6c17\u8efd\u306b\u4f7f\u3044\u59cb\u3081\u3089\u308c\u308b\u306e\u304c\u826f\u3044\u3067\u3059\u306d\u3002<\/p>\n<p>\u500b\u4eba\u7684\u306b\u306f\u3001\u72ec\u81ea\u306e\u578b\u3092\u4f5c\u308b\u3068\u3053\u308d\u304b\u3089\u767a\u60f3\u3057\u305f\u65b9\u304c\u5408\u7406\u7684\u306a\u69cb\u9020\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u8a2d\u8a08\u3057\u3084\u3059\u3044\u3088\u3046\u306b\u611f\u3058\u3066\u3044\u308b\u306e\u3067\u3001\u696d\u52d9\u30b3\u30fc\u30c9\u3067\u3082\u7a4d\u6975\u7684\u306b\u53d6\u308a\u5165\u308c\u3066\u884c\u304d\u305f\u3044\u3068\u601d\u3063\u3066\u3044\u307e\u3059\u3002<br \/>\n\u30c0\u30e1\u305d\u3046\u3060\u3063\u305f\u3089\u3059\u3050\u96e2\u308c\u3089\u308c\u308b\u8efd\u3055\u3082\u3046\u308c\u3057\u3044\u3068\u3053\u308d\u3067\u3059\u3002<\/p>\n<p>\u4ee5\u4e0a\u3001\u53c2\u8003\u306b\u306a\u308c\u3070\u5e78\u3044\u3067\u3059<\/p>\n<p>\u4eca\u56de\u3054\u7d39\u4ecb\u3057\u305f\u3088\u3046\u306a\u3001<a href=\"https:\/\/mmmcorp.co.jp\/services\/entrusted_development\/\">\u5408\u7406\u7684\u306a\u69cb\u9020\u306e\u30d3\u30b8\u30cd\u30b9\u30fb\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u958b\u767a<\/a>\u3092\u5fa1\u5e0c\u671b\u306e\u4f01\u696d\u69d8\u306f\u3001\u662f\u975eMMM\u306b\u3054\u76f8\u8ac7\u4e0b\u3055\u3044\u307e\u305b\uff01<\/p>\n<h2 id=\"outline__5\" id=\"\u53c2\u8003\">\u53c2\u8003<\/h2>\n<ul>\n<li><a href=\"http:\/\/flowtype.org\/\">Flow | A static type checker for JavaScript<\/a><\/li>\n<li><a href=\"http:\/\/qiita.com\/joe-re\/items\/3dd0d4941da014acf768\">Flowtype\u3092\u4f7f\u3063\u3066ReactComponent\u3067\u578b\u5b89\u5168\u3092\u624b\u306b\u5165\u308c\u308b<\/a><\/li>\n<li><a href=\"http:\/\/qiita.com\/mizchi\/items\/95ee0101ac22e4b7b662\">\u578b\u306a\u304d\u4e16\u754c\u306e\u305f\u3081\u306eflowtype\u5165\u9580<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u30cf\u30a6\u30b9\u30fb\u30aa\u30d6\u30fb\u30ab\u30fc\u30c9\u3067\u5bdd\u4e0d\u8db3\u306e\u5c0f\u98fc\u3067\u3059\u3002 \u3069\u3046\u306a\u308b\u3093\u3067\u3059\u304b\u3001\u3042\u306e\u30a2\u30ec\u306f&#8230; \u3055\u3066\u3001\u6700\u8fd1\u500b\u4eba\u7684\u306bGolang\u3067\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u4f5c\u3063\u305f\u308a\u3001Haskell\u3092\u52c9\u5f37\u3057\u305f\u308a\u3057\u3066\u3044\u307e\u3059\u3002 \u3044\u305a\u308c\u3082\u9759\u7684\u578b\u4ed8\u3051\u306b\u3088\u308a\u3001\u5b9f\u884c\u524d\u306b\u578b\u30a8\u30e9\u30fc\u3092\u691c\u51fa\u53ef\u80fd\u306a\u8a00\u8a9e\u3067\u3059\u3002 \u79c1\u306f\u666e\u6bb5\u3001\u52d5\u7684\u578b\u4ed8\u3051\u8a00\u8a9e\u3067\u3042\u308bJavaScript\u3092\u4e3b\u306b\u66f8\u3044\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u521d\u3081\u3053\u305d\u30d3\u30eb\u30c9\u6642\u306e\u30a8\u30e9\u30fc\u306b\u30e4\u30ad\u30e2\u30ad\u3057\u305f\u308a\u3057\u307e\u3057\u305f\u304c\u3001\u6163\u308c\u3066\u304f\u308b\u3068\u975e\u5e38\u306b\u5feb\u9069\u306b\u611f\u3058\u308b [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":826,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[7],"tags":[77,78,174],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/p-corporate-blog-cms.mmmcorp.co.jp\/wp-json\/wp\/v2\/posts\/256"}],"collection":[{"href":"https:\/\/p-corporate-blog-cms.mmmcorp.co.jp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/p-corporate-blog-cms.mmmcorp.co.jp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/p-corporate-blog-cms.mmmcorp.co.jp\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/p-corporate-blog-cms.mmmcorp.co.jp\/wp-json\/wp\/v2\/comments?post=256"}],"version-history":[{"count":0,"href":"https:\/\/p-corporate-blog-cms.mmmcorp.co.jp\/wp-json\/wp\/v2\/posts\/256\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/p-corporate-blog-cms.mmmcorp.co.jp\/wp-json\/wp\/v2\/media\/826"}],"wp:attachment":[{"href":"https:\/\/p-corporate-blog-cms.mmmcorp.co.jp\/wp-json\/wp\/v2\/media?parent=256"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/p-corporate-blog-cms.mmmcorp.co.jp\/wp-json\/wp\/v2\/categories?post=256"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/p-corporate-blog-cms.mmmcorp.co.jp\/wp-json\/wp\/v2\/tags?post=256"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}