{"id":105449,"date":"2016-11-30T13:00:22","date_gmt":"2016-11-30T04:00:22","guid":{"rendered":"http:\/\/www.key-p.com\/blog\/staff\/?p=105449"},"modified":"2017-09-01T18:47:15","modified_gmt":"2017-09-01T09:47:15","slug":"babel-preset-env%e3%81%a7%e7%92%b0%e5%a2%83%e3%81%ab%e5%90%88%e3%82%8f%e3%81%9b%e3%81%a6javascript%e3%82%92%e3%83%88%e3%83%a9%e3%83%b3%e3%82%b9%e3%83%91%e3%82%a4%e3%83%ab%e3%81%99%e3%82%8b","status":"publish","type":"post","link":"https:\/\/www.key-p.com\/blog\/staff\/archives\/105449","title":{"rendered":"babel-preset-env\u3067\u74b0\u5883\u306b\u5408\u308f\u305b\u3066JavaScript\u3092\u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30eb\u3059\u308b"},"content":{"rendered":"<p>\nt\u3067\u3059\u3002\u4eca\u56de\u306f\u3001<a href=\"https:\/\/babeljs.io\/\" target=\"_blank\">Babel<\/a>\u3092\u4f7f\u3063\u3066JavaScript\u30b3\u30fc\u30c9\u3092\u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30eb\u3059\u308b\u3068\u304d\u306b\u4fbf\u5229\u306a\u3001<a href=\"https:\/\/github.com\/babel\/babel-preset-env\" target=\"_blank\">babel-preset-env<\/a>\u306b\u3064\u3044\u3066\u7d39\u4ecb\u3057\u307e\u3059\u3002<br \/>\n<br \/>\nBabel\u306f\u3001ES2015\u3001ES2016\u306a\u3069\u306e\u65b0\u3057\u3044JavaScript\u306e\u6587\u6cd5\u3084\u6a5f\u80fd\u3092\u3001\u5bfe\u5fdc\u3057\u3066\u3044\u306a\u3044JavaScript\u74b0\u5883\u3067\u3082\u5229\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u3001JavaScript\u306e\u30b3\u30fc\u30c9\u3092\u5909\u63db\u3057\u307e\u3059\u3002<br \/>\n<br \/>\n\u6700\u8fd1\u3067\u306f\u3001ES2015\u3001ES2016\u3078\u306eJavaScript\u74b0\u5883\u306e\u5bfe\u5fdc\u3082\u9032\u3093\u3067\u3044\u307e\u3059\u304c\u3001\u305d\u308c\u3068\u540c\u6642\u306b\u3001\u65b0\u3057\u3044\u6587\u6cd5\u3084\u6a5f\u80fd\u306e\u7b56\u5b9a\u3082\u884c\u308f\u308c\u3066\u3044\u307e\u3059\u3002<br \/>\nbabel-preset-env\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u7c21\u5358\u306b\u3001\u65e2\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u6a5f\u80fd\u306f\u5909\u63db\u3092\u884c\u308f\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\n<h3>\u74b0\u5883\u6e96\u5099<\/h3>\nbabel-preset-env\u3092\u4f7f\u3063\u3066\u3069\u306e\u3088\u3046\u306b\u5909\u63db\u3055\u308c\u308b\u304b\u3092\u3001\u300cindex.js\u300d\u3092\u4f7f\u3063\u3066\u898b\u3066\u3044\u304d\u307e\u3059\u3002<br \/>\n\u4ee5\u4e0b\u306e3\u3064\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u3001\u4efb\u610f\u306e\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306b\u6e96\u5099\u3057\u3066\u304f\u3060\u3055\u3044\u3002<br \/>\n<pre class=\"lang:default highlight:0 decode:true\" title=\"\u30d5\u30a1\u30a4\u30eb\u69cb\u6210\">\/path\/to\/any\/directory\n\u251c.babelrc\n\u251cindex.js\n\u2514package.json<\/pre>\n\u300cpackage.json\u300d\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u5c0e\u5165\u3059\u308b\u5b9a\u7fa9\u3092\u8a18\u8ff0\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n<ul>\n \t<li>babel-cli: \u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30eb\u3092\u884c\u3046\u30b3\u30de\u30f3\u30c9<\/li>\n \t<li>babel-polyfill: Babel\u306b\u3088\u308b\u5909\u63db\u5f8c\u306e\u30b3\u30fc\u30c9\u306b\u3088\u3063\u3066\u306f\u5fc5\u8981\u3068\u306a\u308b\u95a2\u6570\u306a\u3069\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b<\/li>\n \t<li>babel-preset-env: \u74b0\u5883\u306b\u5408\u308f\u305b\u305f\u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30eb\u3092\u884c\u3046\u30d7\u30ea\u30bb\u30c3\u30c8<\/li>\n<\/ul>\n<pre class=\"lang:js decode:true \" title=\"package.json\">{\n  \"name\": \"babel-env-example\",\n  \"version\": \"1.0.0\",\n  \"description\": \"\",\n  \"scripts\": {\n    \"build\": \"babel index.js --out-file compiled.js\"\n  },\n  \"keywords\": [],\n  \"author\": \"\",\n  \"license\": \"ISC\",\n  \"devDependencies\": {\n    \"babel-cli\": \"^6.18.0\",\n    \"babel-polyfill\": \"^6.16.0\",\n    \"babel-preset-env\": \"0.0.9\"\n  }\n}<\/pre>\n\u300cindex.js\u300d\u3067\u306f\u3001\u3044\u304f\u3064\u304b\u306e\u65b0\u3057\u3044JavaScript\u306e\u6587\u6cd5\u3084\u6a5f\u80fd\u3092\u8a18\u8ff0\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n<pre class=\"lang:js decode:true \" title=\"index.js\">import 'babel-polyfill';\n\n\/\/ \u30a2\u30ed\u30fc\u95a2\u6570\nconst f = n =&gt; n &gt; 1 ? f( n - 1 ) + f( n - 2 ) : n;\n\n\/\/ \u3079\u304d\u4e57\u6f14\u7b97\u5b50\nconsole.log( 3 ** 3 );\n\n\/\/ async\u95a2\u6570\nconst asyncFunc = async function () {\n  await Promise.resolve( 1 );\n  return Promise.resolve( 2 );\n}\n\n\/\/ \u30af\u30e9\u30b9\u5b9a\u7fa9\nclass A {\n  constructor() {\n    this.a = 1;\n  }\n}<\/pre>\n\u300c.babelrc\u300d\u3067\u306f\u3001babel-preset-env\u3092\u4f7f\u3063\u3066\u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30eb\u3092\u884c\u3046\u5b9a\u7fa9\u3092\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n\u4eca\u56de\u306f\u3001Node.js\u3067\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u5909\u3048\u305f\u5834\u5408\u3092\u60f3\u5b9a\u3057\u3066\u3001\u3069\u306e\u3088\u3046\u306b\u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30eb\u3055\u308c\u308b\u304b\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002<br \/>\n\u300c\"node\": \"current\"\u300d\u3068\u3059\u308b\u3053\u3068\u3067\u3001\u73fe\u5728\u5229\u7528\u3057\u3066\u3044\u308bNode.js\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u306b\u5408\u308f\u305b\u3066\u3001\u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30eb\u3092\u884c\u3044\u307e\u3059\u3002<br \/>\n<pre class=\"lang:js decode:true \" title=\".babelrc\">{\n  \"presets\": [\n    [ \"env\", {\n      \"targets\": {\n        \"node\": \"current\"\n      }\n    } ]\n  ]\n}<\/pre>\n\u30d5\u30a1\u30a4\u30eb\u306e\u6e96\u5099\u304c\u3067\u304d\u305f\u3089\u3001\u300cnpm i\u300d\u3092\u5b9f\u884c\u3057\u3066\u3001\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u307e\u3059\u3002<br \/>\n<h3>\u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30eb\u7d50\u679c<\/h3>\n\u9055\u3046\u30d0\u30fc\u30b8\u30e7\u30f3\u306eNode.js\u3067\u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30eb\u3057\u305f\u30b3\u30fc\u30c9\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<br \/>\n<br \/>\n\u305d\u308c\u305e\u308c\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u306eNode.js\u306b\u3057\u3066\u304b\u3089\u3001\u300cnpm run build\u300d\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u305d\u3046\u3059\u308b\u3068\u3001\u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30eb\u5f8c\u306e\u30b3\u30fc\u30c9\u304c\u300ccompiled.js\u300d\u306b\u751f\u6210\u3055\u308c\u307e\u3059\u3002<br \/>\n(Node.js\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u5909\u66f4\u306f\u3001NVM\u306a\u3069\u3092\u4f7f\u3046\u3068\u624b\u8efd\u3067\u3059)<br \/>\n<br \/>\n\u4eca\u56de\u306f\u3001Node.js \u306e 4.6.2\u30687.2.0\u3067\u5207\u308a\u66ff\u3048\u3066\u3001\u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30eb\u3057\u307e\u3057\u305f\u3002<br \/>\n\u4ee5\u4e0b\u304c\u3001\u305d\u308c\u305e\u308c\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u306e\u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30eb\u5f8c\u306e\u30b3\u30fc\u30c9\u3067\u3059\u3002<br \/>\n<h5>4.6.2\u3067\u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30eb\u3057\u305fcompiled.js<\/h5>\n<pre class=\"lang:js decode:true \" title=\"4.6.2\u3067\u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30eb\u3057\u305fcompiled.js\">'use strict';\n\nrequire('babel-polyfill');\n\nfunction _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError(\"Cannot call a class as a function\"); } }\n\nfunction _asyncToGenerator(fn) { return function () { var gen = fn.apply(this, arguments); return new Promise(function (resolve, reject) { function step(key, arg) { try { var info = gen[key](arg); var value = info.value; } catch (error) { reject(error); return; } if (info.done) { resolve(value); } else { return Promise.resolve(value).then(function (value) { step(\"next\", value); }, function (err) { step(\"throw\", err); }); } } return step(\"next\"); }); }; }\n\n\/\/ \u30a2\u30ed\u30fc\u95a2\u6570\nvar f = function f(n) {\n  return n &gt; 1 ? f(n - 1) + f(n - 2) : n;\n};\n\n\/\/ \u3079\u304d\u4e57\u6f14\u7b97\u5b50\nconsole.log(Math.pow(3, 3));\n\n\/\/ async\u95a2\u6570\nvar asyncFunc = function () {\n  var _ref = _asyncToGenerator(regeneratorRuntime.mark(function _callee() {\n    return regeneratorRuntime.wrap(function _callee$(_context) {\n      while (1) {\n        switch (_context.prev = _context.next) {\n          case 0:\n            _context.next = 2;\n            return Promise.resolve(1);\n\n          case 2:\n            return _context.abrupt('return', Promise.resolve(2));\n\n          case 3:\n          case 'end':\n            return _context.stop();\n        }\n      }\n    }, _callee, this);\n  }));\n\n  return function asyncFunc() {\n    return _ref.apply(this, arguments);\n  };\n}();\n\n\/\/ \u30af\u30e9\u30b9\u5b9a\u7fa9\n\nvar A = function A() {\n  _classCallCheck(this, A);\n\n  this.a = 1;\n};\n<\/pre>\n<h5>7.2.0\u3067\u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30eb\u3057\u305fcompiled.js<\/h5>\n<pre class=\"lang:js decode:true \" title=\"7.2.0\u3067\u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30eb\u3057\u305fcompiled.js\">'use strict';\n\nrequire('babel-polyfill');\n\nfunction _asyncToGenerator(fn) { return function () { var gen = fn.apply(this, arguments); return new Promise(function (resolve, reject) { function step(key, arg) { try { var info = gen[key](arg); var value = info.value; } catch (error) { reject(error); return; } if (info.done) { resolve(value); } else { return Promise.resolve(value).then(function (value) { step(\"next\", value); }, function (err) { step(\"throw\", err); }); } } return step(\"next\"); }); }; }\n\n\/\/ \u30a2\u30ed\u30fc\u95a2\u6570\nconst f = n =&gt; n &gt; 1 ? f(n - 1) + f(n - 2) : n;\n\n\/\/ \u3079\u304d\u4e57\u6f14\u7b97\u5b50\nconsole.log(Math.pow(3, 3));\n\n\/\/ async\u95a2\u6570\nconst asyncFunc = (() =&gt; {\n  var _ref = _asyncToGenerator(function* () {\n    yield Promise.resolve(1);\n    return Promise.resolve(2);\n  });\n\n  return function asyncFunc() {\n    return _ref.apply(this, arguments);\n  };\n})();\n\n\/\/ \u30af\u30e9\u30b9\u5b9a\u7fa9\nclass A {\n  constructor() {\n    this.a = 1;\n  }\n}\n<\/pre>\n<h5>\u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30eb\u5f8c\u30b3\u30fc\u30c9\u306e\u9055\u3044\u3092\u898b\u308b<\/h5>\nNode.js 4.6.2\u30687.2.0\u305d\u308c\u305e\u308c\u3067\u3001\u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30eb\u3057\u305f\u5f8c\u306e\u30b3\u30fc\u30c9\u306b\u3064\u3044\u3066\u3001\u9055\u3044\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002<br \/>\n<br \/>\n\u30a2\u30ed\u30fc\u95a2\u6570\u3084\u30af\u30e9\u30b9\u5b9a\u7fa9\u306b\u3064\u3044\u3066\u306f\u30014.6.2\u3067\u306f\u672a\u5bfe\u5fdc\u3067\u3059\u304c\u30017.2.0\u3067\u306f\u5bfe\u5fdc\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u30014.6.2\u306e\u307f\u3067\u5909\u63db\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3079\u304d\u4e57\u6f14\u7b97\u5b50\u306b\u3064\u3044\u3066\u306f\u3069\u3061\u3089\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u3082\u672a\u5bfe\u5fdc\u306a\u306e\u3067\u5909\u63db\u3055\u308c\u3066\u3044\u307e\u3059\u3002<br \/>\nasync\u95a2\u6570\u306b\u3064\u3044\u3066\u306f\u3001\u3069\u3061\u3089\u3082\u672a\u5bfe\u5fdc\u306a\u306e\u3067\u5909\u63db\u306f\u884c\u308f\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u30b3\u30fc\u30c9\u304c\u5c11\u3005\u7570\u306a\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u30027.2.0\u3067\u306fgenerator\u95a2\u6570\u306b\u5bfe\u5fdc\u3057\u3066\u304a\u308a\u3001generator\u95a2\u6570\u3092\u4f7f\u3063\u305f\u30b3\u30fc\u30c9\u306b\u5909\u63db\u3055\u308c\u3066\u3044\u308b\u306e\u306b\u5bfe\u3057\u3066\u30014.6.2\u3067\u306fgenerator\u95a2\u6570\u306b\u3082\u672a\u5bfe\u5fdc\u306a\u306e\u3067\u3001switch-case\u6587\u3092\u4f7f\u3063\u305f\u30b3\u30fc\u30c9\u306b\u5909\u63db\u3055\u308c\u3066\u3044\u307e\u3059\u3002<br \/>\nasync\u95a2\u6570\u3067\u306egenerator\u95a2\u6570\u306e\u3088\u3046\u306b\u3001\u3067\u304d\u308b\u3060\u3051\u65e2\u306b\u3042\u308b\u6a5f\u80fd\u3092\u4f7f\u3046\u3088\u3046\u306b\u5909\u63db\u3055\u308c\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<br \/>\n<h3>\u6700\u5f8c\u306b<\/h3>\n\u4eca\u56de\u306f\u3001Node.js\u3067\u4f7f\u3046\u30b3\u30fc\u30c9\u3067\u3001\u30d0\u30fc\u30b8\u30e7\u30f3\u9593\u306e\u30b3\u30fc\u30c9\u5909\u63db\u3092babel-preset-env\u3067\u884c\u3044\u307e\u3057\u305f\u3002<br \/>\n<br \/>\nJavaScript\u3082\u30d0\u30fc\u30b8\u30e7\u30f3\u306b\u3088\u3063\u3066\u6587\u6cd5\u3084\u6a5f\u80fd\u304c\u5909\u308f\u3063\u3066\u304d\u307e\u3059\u304c\u3001\u5909\u63db\u3057\u3066\u3042\u3052\u305f\u3089\u3001\u624b\u5143\u306b\u3042\u308b\u30b3\u30fc\u30c9\u304c\u672a\u5bfe\u5fdc\u306e\u74b0\u5883\u3067\u3082\u3001\u7c21\u5358\u306b\u5bfe\u5fdc\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u899a\u3048\u3066\u304a\u3044\u3066\u640d\u306f\u306a\u3044\u3068\u601d\u3044\u307e\u3059\uff01<br \/>\n<br \/>\n( \u3061\u306a\u307f\u306b\u3001Node.js\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3060\u3051\u3067\u306a\u304f\u3001\u30d6\u30e9\u30a6\u30b6\u3092\u6307\u5b9a\u3057\u305f\u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30eb\u3082\u3067\u304d\u307e\u3059\u3002<a href=\"https:\/\/github.com\/babel\/babel-preset-env\" target=\"_blank\">babel-preset-env<\/a>\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002 )<br \/>\n<br \/>\n<a href=\"http:\/\/www.key-p.com\/recruit\/\" target=\"new\">\u30ad\u30fc\u30fb\u30dd\u30a4\u30f3\u30c8\u3067\u306f\u3001\u3044\u308d\u3044\u308d\u306a\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u3044\u3053\u306a\u3059\u30a8\u30f3\u30b8\u30cb\u30a2\u3092\u52df\u96c6\u3057\u3066\u3044\u307e\u3059\u3002<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>t\u3067\u3059\u3002\u4eca\u56de\u306f\u3001Babel\u3092\u4f7f\u3063\u3066JavaScript\u30b3\u30fc\u30c9\u3092\u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30eb\u3059\u308b &hellip; <a href=\"https:\/\/www.key-p.com\/blog\/staff\/archives\/105449\">\u7d9a\u304d\u3092\u8aad\u3080 <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":40,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[16],"tags":[],"jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/www.key-p.com\/blog\/staff\/wp-json\/wp\/v2\/posts\/105449"}],"collection":[{"href":"https:\/\/www.key-p.com\/blog\/staff\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.key-p.com\/blog\/staff\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.key-p.com\/blog\/staff\/wp-json\/wp\/v2\/users\/40"}],"replies":[{"embeddable":true,"href":"https:\/\/www.key-p.com\/blog\/staff\/wp-json\/wp\/v2\/comments?post=105449"}],"version-history":[{"count":17,"href":"https:\/\/www.key-p.com\/blog\/staff\/wp-json\/wp\/v2\/posts\/105449\/revisions"}],"predecessor-version":[{"id":106247,"href":"https:\/\/www.key-p.com\/blog\/staff\/wp-json\/wp\/v2\/posts\/105449\/revisions\/106247"}],"wp:attachment":[{"href":"https:\/\/www.key-p.com\/blog\/staff\/wp-json\/wp\/v2\/media?parent=105449"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.key-p.com\/blog\/staff\/wp-json\/wp\/v2\/categories?post=105449"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.key-p.com\/blog\/staff\/wp-json\/wp\/v2\/tags?post=105449"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}