{"id":44605,"date":"2023-04-18T20:28:12","date_gmt":"2023-04-18T11:28:12","guid":{"rendered":"https:\/\/kinsta.com\/jp\/?p=44605&preview=true&preview_id=44605"},"modified":"2023-09-25T20:24:58","modified_gmt":"2023-09-25T11:24:58","slug":"typescript-5-0","status":"publish","type":"post","link":"https:\/\/kinsta.com\/jp\/blog\/typescript-5-0\/","title":{"rendered":"\u3010TypeScript 5.0\u306e\u65b0\u6a5f\u80fd\u3011\u5ba3\u8a00\u5b50\u3001const\u578b\u3001enum\u306e\u6539\u5584\u3001\u30b9\u30d4\u30fc\u30c9\u30a2\u30c3\u30d7\u306a\u3069"},"content":{"rendered":"

2023\u5e743\u670816\u65e5\u306bTypeScript 5.0\u304c\u6b63\u5f0f\u306b\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u3001\u8ab0\u3067\u3082\u5229\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u3053\u306e\u30ea\u30ea\u30fc\u30b9\u3067\u306f\u3001TypeScript\u3092\u3088\u308a\u30b3\u30f3\u30d1\u30af\u30c8\u306b\u3001\u3088\u308a\u30b7\u30f3\u30d7\u30eb\u306b\u3001\u305d\u3057\u3066\u3088\u308a\u9ad8\u901f\u306b\u3059\u308b\u3053\u3068\u3092\u76ee\u7684\u3068\u3057\u3066\u3001\u591a\u304f\u306e\u65b0\u3057\u3044\u6a5f\u80fd\u304c\u5c0e\u5165\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n

\u30af\u30e9\u30b9\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u306e\u30c7\u30b3\u30ec\u30fc\u30bf\u3067\u9855\u8457\u306a\u6539\u826f\u304c\u898b\u3089\u308c\u3001\u30af\u30e9\u30b9\u3068\u305d\u306e\u30e1\u30f3\u30d0\u30fc\u3092\u518d\u5229\u7528\u53ef\u80fd\u306a\u304b\u305f\u3061\u3067\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u958b\u767a\u8005<\/a>\u306b\u5b09\u3057\u3044\u60c5\u5831\u3068\u3057\u3066\u3001\u578b\u30d1\u30e9\u30e1\u30fc\u30bf\u5ba3\u8a00\u306bconst\u4fee\u98fe\u5b50\u3092\u8ffd\u52a0\u3067\u304d\u3001const\u30e9\u30a4\u30af\u306a\u63a8\u8ad6\u3092\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u5b9f\u884c\u53ef\u80fd\u3067\u3059\u3002\u307e\u305f\u3001\u4eca\u56de\u306e\u30ea\u30ea\u30fc\u30b9\u3067enum\uff08\u5217\u6319\u578b\uff09\u306b\u5927\u304d\u306a\u5909\u66f4\u304c\u52a0\u3048\u3089\u308c\u3001\u30b3\u30fc\u30c9\u69cb\u9020\u306e\u7c21\u7d20\u5316\u3068TypeScript\u5168\u4f53\u306e\u9ad8\u901f\u5316\u3082\u5b9f\u73fe\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n

\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001TypeScript 5.0\u3067\u5c0e\u5165\u3055\u308c\u305f\u5909\u66f4\u70b9\u3092\u63a2\u308a\u3001\u305d\u306e\u65b0\u3057\u3044\u6a5f\u80fd\u3084\u7279\u5fb4\u3092\u8a73\u3057\u304f\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n

<\/div><\/kinsta-auto-toc>\n

TypeScript 5.0\u306e\u5229\u7528\u3092\u59cb\u3081\u308b<\/h2>\n

TypeScript\u306f\u3001npm<\/a>\u3092\u4f7f\u3063\u3066\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306b\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u516c\u5f0f\u306e\u30b3\u30f3\u30d1\u30a4\u30e9\u3067\u3059\u3002\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067TypeScript 5.0\u3092\u4f7f\u3044\u59cb\u3081\u308b\u306b\u306f\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3067\u6b21\u306e\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n

npm install -D typescript<\/code><\/pre>\n
\u3053\u308c\u306b\u3088\u308a\u3001\u30b3\u30f3\u30d1\u30a4\u30e9\u304cnode_modules<\/strong>\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306b\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3055\u308c\u3001npx tsc<\/code>\u30b3\u30de\u30f3\u30c9\u3067\u5b9f\u884c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u307e\u305f\u3001Visual Studio Code<\/a>\u3067\u3088\u308a\u65b0\u3057\u3044\u30d0\u30fc\u30b8\u30e7\u30f3\u306eTypeScript\u3092\u4f7f\u7528\u3059\u308b\u624b\u9806\u3082\u3053\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/a>\u306b\u8a18\u8f09\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n
TypeScript 5.0\u3067\u4f55\u304c\u65b0\u3057\u304f\u306a\u3063\u305f\u306e\u304b<\/h2>\n
TypeScript\u306b\u5c0e\u5165\u3055\u308c\u305f5\u3064\u306e\u4e3b\u8981\u306a\u5909\u66f4\u5185\u5bb9\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n
<\/div><\/kinsta-auto-toc>\n
\u30c7\u30b3\u30ec\u30fc\u30bf<\/h3>\n
\u30c7\u30b3\u30ec\u30fc\u30bf\u306f\u3001TypeScript\u3067\u306f\u5b9f\u9a13\u7684\u306a\u30d5\u30e9\u30b0\u3068\u3057\u3066\u3057\u3070\u3089\u304f\u5b58\u5728\u3057\u3066\u3044\u307e\u3057\u305f\u304c\u3001\u4eca\u56de\u306e\u65b0\u3057\u3044\u30ea\u30ea\u30fc\u30b9\u3067\u306f\u3001ECMAScript\u306e\u63d0\u6848\u306b\u5bfe\u5fdc\u3057\u30b9\u30c6\u30fc\u30b83<\/a>\u3001\u3064\u307e\u308aTypeScript\u306b\u8ffd\u52a0\u3055\u308c\u308b\u6bb5\u968e\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u30c7\u30b3\u30ec\u30fc\u30bf\u3092\u4f7f\u3048\u3070\u3001\u30af\u30e9\u30b9\u3068\u305d\u306e\u30e1\u30f3\u30d0\u30fc\u306e\u52d5\u4f5c\u3092\u518d\u5229\u7528\u53ef\u80fd\u306a\u65b9\u6cd5\u3067\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3067\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001greet<\/code>\u3068getAge<\/code>\u3068\u3044\u30462\u3064\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u6301\u3064\u30af\u30e9\u30b9\u304c\u3042\u308b\u3068\u3057\u307e\u3059\u3002<\/p>\n
class Person {\n    name: string;\n    age: number;\n    constructor(name: string, age: number) {\n        this.name = name;\n        this.age = age;\n    }\n\n    greet() {\n        console.log(`Hello, my name is ${this.name}.`);\n    }\n\n    getAge() {\n        console.log(`I am ${this.age} years old.`);\n    }\n}\n\nconst p = new Person('Ron', 30);\np.greet();\np.getAge();<\/code><\/pre>\n
\u5b9f\u969b\u306e\u4f7f\u7528\u4f8b\u3067\u306f\u3001\u3053\u306e\u30af\u30e9\u30b9\u306b\u306f\u975e\u540c\u671f\u30ed\u30b8\u30c3\u30af\u3092\u6271\u3046\u8907\u96d1\u306a\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u3063\u305f\u308a\u3001\u526f\u4f5c\u7528\u304c\u4ecb\u5728\u3057\u305f\u308a\uff08\u30e1\u30bd\u30c3\u30c9\u306e\u30c7\u30d0\u30c3\u30b0\u3092\u52a9\u3051\u308b\u305f\u3081\u306bconsole.log<\/code>\u3092\u547c\u3073\u51fa\u3059\u7b49\uff09\u3059\u308b\u306f\u305a\u3067\u3059\u3002<\/p>\n
class Person {\n    name: string;\n    age: number;\n    constructor(name: string, age: number) {\n        this.name = name;\n        this.age = age;\n    }\n\n    greet() {\n        console.log('LOG: Method Execution Starts.');\n        console.log(`Hello, my name is ${this.name}.`);\n        console.log('LOG: Method Execution Ends.');\n    }\n\n    getAge() {\n        console.log('LOG: Method Execution Starts.');\n        console.log(`I am ${this.age} years old.`);\n        console.log('Method Execution Ends.');\n    }\n}\n\nconst p = new Person('Ron', 30);\np.greet();\np.getAge();<\/code><\/pre>\n
\u3053\u308c\u306f\u983b\u767a\u3059\u308b\u30d1\u30bf\u30fc\u30f3\u306a\u306e\u3067\u3001\u3069\u306e\u65b9\u6cd5\u306b\u3082\u9069\u7528\u3067\u304d\u308b\u89e3\u6c7a\u7b56\u304c\u3042\u308b\u3068\u4fbf\u5229\u3067\u3059\u3002<\/p>\n
\u3053\u3053\u3067\u30c7\u30b3\u30ec\u30fc\u30bf\u306e\u51fa\u756a\u3067\u3059\u3002\u6b21\u306e\u3088\u3046\u306b\u8868\u793a\u3055\u308c\u308bdebugMethod<\/code>\u3068\u3044\u3046\u540d\u524d\u306e\u95a2\u6570\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
function debugMethod(originalMethod: any, context: any) {\n    function replacementMethod(this: any, ...args: any[]) {\n        console.log('Method Execution Starts.');\n        const result = originalMethod.call(this, ...args);\n        console.log('Method Execution Ends.');\n        return result;\n    }\n    return replacementMethod;\n}<\/code><\/pre>\n
\u4e0a\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001debugMethod<\/code>\u304c\u30aa\u30ea\u30b8\u30ca\u30eb\u30e1\u30bd\u30c3\u30c9\uff08originalMethod<\/code>\uff09\u3092\u53d7\u3051\u53d6\u308a\u3001\u6b21\u306e\u3088\u3046\u306a\u95a2\u6570\u3092\u8fd4\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
    \n
  1. \u300cMethod Execution Starts\u300d\u3068\u3044\u3046\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u30ed\u30b0\u306b\u51fa\u529b<\/li>\n
  2. \u30aa\u30ea\u30b8\u30ca\u30eb\u30e1\u30bd\u30c3\u30c9\u3068\u305d\u306e\u3059\u3079\u3066\u306e\u5f15\u6570\uff08this\u3092\u542b\u3080\uff09\u3092\u6e21\u3059<\/li>\n
  3. \u300cMethod Execution Ends\u300d\u3068\u3044\u3046\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u30ed\u30b0\u306b\u51fa\u529b<\/li>\n
  4. \u30aa\u30ea\u30b8\u30ca\u30eb\u30e1\u30bd\u30c3\u30c9\u304b\u3089\u306e\u3082\u306e\u3092\u3059\u3079\u3066\u8fd4\u3059<\/li>\n<\/ol>\n
    \u30c7\u30b3\u30ec\u30fc\u30bf\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u306e\u3088\u3046\u306b\u30e1\u30bd\u30c3\u30c9\u306bdebugMethod<\/code>\u3092\u9069\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
    class Person {\n    name: string;\n    age: number;\n    constructor(name: string, age: number) {\n        this.name = name;\n        this.age = age;\n    }\n    @debugMethod\n    greet() {\n        console.log(`Hello, my name is ${this.name}.`);\n    }\n    @debugMethod\n    getAge() {\n        console.log(`I am ${this.age} years old.`);\n    }\n}\nconst p = new Person('Ron', 30);\np.greet();\np.getAge();<\/code><\/pre>\n
    \u3053\u308c\u306b\u3088\u308a\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u51fa\u529b\u304c\u5f97\u3089\u308c\u307e\u3059\u3002<\/p>\n
    LOG: Entering method.\nHello, my name is Ron.\nLOG: Exiting method.\nLOG: Entering method.\nI am 30 years old.\nLOG: Exiting method.<\/code><\/pre>\n
    \u30c7\u30b3\u30ec\u30fc\u30bf\u95a2\u6570\uff08debugMethod<\/code>\uff09\u3092\u5b9a\u7fa9\u3059\u308b\u3068\u304d\u3001context<\/code>\u3068\u3044\u30462\u756a\u76ee\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u304c\u6e21\u3055\u308c\u307e\u3059\uff08\u3053\u308c\u306f\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3001\u30e1\u30bd\u30c3\u30c9\u304c\u3069\u306e\u3088\u3046\u306b\u5ba3\u8a00\u3055\u308c\u305f\u304b\u3001\u307e\u305f\u30e1\u30bd\u30c3\u30c9\u306e\u540d\u524d\u306a\u3069\u3001\u4fbf\u5229\u306a\u60c5\u5831\u3068\u306a\u308a\u307e\u3059\uff09\u3002debugMethod<\/code>\u3092\u66f4\u65b0\u3057\u3001context<\/code>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304b\u3089\u30e1\u30bd\u30c3\u30c9\u540d\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
    function debugMethod(\n    originalMethod: any,\n    context: ClassMethodDecoratorContext\n) {\n    const methodName = String(context.name);\n    function replacementMethod(this: any, ...args: any[]) {\n        console.log(`'${methodName}' Execution Starts.`);\n        const result = originalMethod.call(this, ...args);\n        console.log(`'${methodName}' Execution Ends.`);\n        return result;\n    }\n    return replacementMethod;\n}<\/code><\/pre>\n
    \u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001debugMethod<\/code>\u30c7\u30b3\u30ec\u30fc\u30bf\u3067\u88c5\u98fe\u3055\u308c\u305f\u5404\u30e1\u30bd\u30c3\u30c9\u306e\u540d\u524d\u304c\u51fa\u529b\u3055\u308c\u307e\u3059\u3002<\/p>\n
    'greet' Execution Starts.\nHello, my name is Ron.\n'greet' Execution Ends.\n'getAge' Execution Starts.\nI am 30 years old.\n'getAge' Execution Ends.<\/code><\/pre>\n
    \u30c7\u30b3\u30ec\u30fc\u30bf\u3067\u3067\u304d\u308b\u3053\u3068\u306f\u307e\u3060\u307e\u3060\u3042\u308a\u307e\u3059\u3002TypeScript\u3067\u30c7\u30b3\u30ec\u30fc\u30bf\u3092\u4f7f\u3046\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f\u3001\u5143\u306e\u30d7\u30eb\u30ea\u30af\u30a8\u30b9\u30c8<\/a>\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n
    const\u578b\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u5c0e\u5165<\/h3>\n
    \u3053\u308c\u306f\u3001\u95a2\u6570\u3092\u547c\u3073\u51fa\u3059\u3068\u304d\u306b\u5f97\u3089\u308c\u308b\u63a8\u8ad6\u3092\u6539\u5584\u3059\u308b\u3082\u306e\u3067\u3001\u30b8\u30a7\u30cd\u30ea\u30c3\u30af\u578b\u307e\u3067\u305d\u306e\u5bfe\u8c61\u7bc4\u56f2\u304c\u62e1\u5927\u3057\u3066\u3044\u307e\u3059\u3002\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u3001const<\/code>\u3067\u5024\u3092\u5ba3\u8a00\u3059\u308b\u3068\u3001TypeScript\u306b\u3088\u308a\uff08\u30ea\u30c6\u30e9\u30eb\u5024\u3067\u306f\u306a\u304f\uff09\u578b\u304c\u63a8\u8ad6\u3055\u308c\u307e\u3059\u3002<\/p>\n
    \/\/ Inferred type: string[]\nconst names = ['John', 'Jake', 'Jack'];<\/code><\/pre>\n
    \u3053\u308c\u307e\u3067\u306f\u3001\u76ee\u7684\u3069\u304a\u308a\u306e\u63a8\u8ad6\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u300cas const\u300d\u3092\u4ed8\u3051\u3066const\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u3092\u884c\u3046\u5fc5\u8981\u304c\u3042\u308a\u307e\u3057\u305f\u3002<\/p>\n
    \/\/ Inferred type: readonly [\"John\", \"Jake\", \"Jack\"]\nconst names = ['John', 'Jake', 'Jack'] as const;<\/code><\/pre>\n
    \u95a2\u6570\u3092\u547c\u3073\u51fa\u3059\u3068\u304d\u3082\u3001\u4f3c\u305f\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001\u63a8\u8ad6\u3055\u308c\u308bcountries\uff08\u56fd\uff09<\/strong>\u306e\u7a2e\u985e\u306fstring[]<\/code> \u3067\u3059\u3002<\/p>\n
    type HasCountries = { countries: readonly string[] };\nfunction getCountriesExactly(arg: T): T['countries'] {\n    return arg.countries;\n}\n\n\/\/ Inferred type: string[]\nconst countries = getCountriesExactly({ countries: ['USA', 'Canada', 'India'] });<\/code><\/pre>\n
    \u305d\u3057\u3066\u3001\u3088\u308a\u6b63\u78ba\u306a\u578b\u3092\u6c42\u3081\u308b\u306e\u3067\u3042\u308c\u3070\uff08\u4ee5\u524d\u304b\u3089\u53ef\u80fd\u306a\u65b9\u6cd5\u3068\u3057\u3066\uff09as const<\/code>\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
    \/\/ Inferred type: readonly [\"USA\", \"Canada\", \"India\"]\nconst names = getNamesExactly({ countries: ['USA', 'Canada', 'India'] } as const);<\/code><\/pre>\n
    \u3068\u306f\u8a00\u3048\u3001\u3053\u308c\u306f\u899a\u3048\u308b\u306e\u3082\u5b9f\u88c5\u3059\u308b\u306e\u3082\u6642\u306b\u9762\u5012\u306b\u306a\u308a\u5f97\u307e\u3059\u3002\u305d\u3053\u3067\u3001TypeScript 5.0\u3067\u306f\u3001\u578b\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u5ba3\u8a00\u306bconst\u4fee\u98fe\u5b50\u3092\u8ffd\u52a0\u3059\u308b\u6a5f\u80fd\u304c\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u81ea\u52d5\u7684\u306bconst\u30e9\u30a4\u30af\u306a\u63a8\u8ad6\u3092\u9069\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
    type HasCountries = { countries: readonly string[] };\nfunction getNamesExactly(arg: T): T['countries'] {\n    return arg.countries;\n}\n\n\/\/ Inferred type: readonly [\"USA\", \"Canada\", \"India\"]\nconst names = getNamesExactly({ countries: ['USA', 'Canada', 'India'] });<\/code><\/pre>\n
    const<\/code>\u578b\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u958b\u767a\u8005\u306f\u30b3\u30fc\u30c9\u5185\u3067\u4eca\u307e\u3067\u4ee5\u4e0a\u306b\u660e\u78ba\u306b\u610f\u56f3\u3092\u8868\u73fe\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3042\u308b\u5909\u6570\u304c\u4e00\u5b9a\u3067\u5909\u5316\u3057\u306a\u3044\u3053\u3068\u3092\u610f\u56f3\u3059\u308b\u5834\u5408\u3001const<\/code>\u578b\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u8aa4\u3063\u3066\u5909\u5316\u3057\u3066\u3057\u307e\u3046\u53ef\u80fd\u6027\u3092\u6392\u9664\u3067\u304d\u307e\u3059\u3002<\/p>\n
    TypeScript\u3067const\u578b\u30d1\u30e9\u30e1\u30fc\u30bf\u304c\u3069\u306e\u3088\u3046\u306b\u6a5f\u80fd\u3059\u308b\u304b\u306b\u3064\u3044\u3066\u306f\u3001\u5143\u306e\u30d7\u30eb\u30ea\u30af\u30a8\u30b9\u30c8<\/a>\u3092\u3054\u78ba\u8a8d\u304f\u3060\u3055\u3044\u3002<\/p>\n
    enum\u306e\u6539\u826f<\/h3>\n
    TypeScript\u306eenum\u3092\u4f7f\u7528\u3059\u308c\u3070\u3001\u540d\u524d\u4ed8\u304d\u5b9a\u6570\u306e\u307e\u3068\u307e\u308a\u3092\u67d4\u8edf\u306b\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002TypeScript 5.0\u3067\u306f\u3001\u3053\u306eenum\u306b\u6539\u826f\u304c\u52a0\u3048\u3089\u308c\u3001\u3088\u308a\u4fbf\u5229\u306a\u3082\u306e\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n
    \u4f8b\u3048\u3070\u3001\u3042\u308b\u95a2\u6570\u306b\u6b21\u306e\u3088\u3046\u306aenum\u304c\u6e21\u3055\u308c\u305f\u3068\u3057\u307e\u3059\u3002<\/p>\n
    enum Color {\n    Red,\n    Green,\n    Blue,\n}\n\nfunction getColorName(colorLevel: Color) {\n    return colorLevel;\n}\n\nconsole.log(getColorName(1));<\/code><\/pre>\n
    TypeScript 5.0\u304c\u5c0e\u5165\u3055\u308c\u308b\u524d\u306f\u3001\u9593\u9055\u3063\u305f\u6570\u5b57\u3092\u6e21\u3057\u3066\u3082\u3001\u30a8\u30e9\u30fc\u306f\u51fa\u307e\u305b\u3093\u3067\u3057\u305f\u3002\u3057\u304b\u3057\u3001TypeScript 5.0\u306e\u5c0e\u5165\u306b\u3088\u308a\u3001\u3059\u3050\u306b\u30a8\u30e9\u30fc\u304c\u6295\u3052\u3089\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n
    \u307e\u305f\u3001\u4eca\u56de\u306e\u30ea\u30ea\u30fc\u30b9\u3067\u306f\u3001\u30e1\u30f3\u30d0\u30fc\u3054\u3068\u306b\u30e6\u30cb\u30fc\u30af\u306a\u578b\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u3067\u3001enum\u304cunion enum\u306b\u306a\u3063\u3066\uff08enum\u306e\u5024\u306b\u5b9a\u6570\u4ee5\u5916\u306e\u5024\u3092\u6307\u5b9a\u53ef\u80fd\uff09\u3044\u307e\u3059\u3002\u3053\u306e\u6539\u5584\u306b\u3088\u308a\u3001\u3059\u3079\u3066\u306eenum\u304b\u3089\u7d5e\u308a\u8fbc\u307f\u3001\u305d\u306e\u30e1\u30f3\u30d0\u30fc\u3092\u578b\u3068\u3057\u3066\u53c2\u7167\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n
    enum Color {\n    Red,\n    Purple,\n    Orange,\n    Green,\n    Blue,\n    Black,\n    White,\n}\n\ntype PrimaryColor = Color.Red | Color.Green | Color.Blue;\n\nfunction isPrimaryColor(c: Color): c is PrimaryColor {\n    return c === Color.Red || c === Color.Green || c === Color.Blue;\n}\n\nconsole.log(isPrimaryColor(Color.White)); \/\/ Outputs: false\nconsole.log(isPrimaryColor(Color.Red)); \/\/ Outputs: true<\/code><\/pre>\n
    TypeScript 5.0\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u5411\u4e0a<\/h3>\n
    TypeScript 5.0\u3067\u306f\u3001\u30b3\u30fc\u30c9\u306e\u69cb\u9020\u3001\u30c7\u30fc\u30bf\u306e\u69cb\u9020\u3001\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u62e1\u5f35\u306a\u3069\u3001\u6570\u591a\u304f\u306e\u91cd\u8981\u306a\u5909\u66f4\u304c\u884c\u308f\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u304b\u3089\u5b9f\u884c\u307e\u3067\u3001TypeScript\u306e\u4f7f\u3044\u3084\u3059\u3055\u5168\u4f53\u304c\u6539\u5584\u3055\u308c\u3001\u3088\u308a\u901f\u304f\u3001\u3088\u308a\u52b9\u7387\u7684\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n
    \u4f8b\u3048\u3070\u3001TypeScript 5.0\u30684.9\u306e\u30d1\u30c3\u30b1\u30fc\u30b8\u30b5\u30a4\u30ba\u306e\u5dee\u306f\u3001\u975e\u5e38\u306b\u5927\u304d\u306a\u3082\u306e\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n
    TypeScript\u306f\u6700\u8fd1\u3001\u540d\u524d\u7a7a\u9593\u304b\u3089\u30e2\u30b8\u30e5\u30fc\u30eb\u306b\u79fb\u884c\u3055\u308c\u3001\u30b9\u30b3\u30fc\u30d7\u306e\u30db\u30a4\u30b9\u30c6\u30a3\u30f3\u30b0\uff08\u5dfb\u304d\u4e0a\u3052\uff09\u306a\u3069\u306e\u6700\u9069\u5316\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u307e\u305f\u3001\u975e\u63a8\u5968\u30b3\u30fc\u30c9\u306e\u524a\u9664\u306b\u3088\u308a\u3001TypeScript 4.9\u306e\u30d1\u30c3\u30b1\u30fc\u30b8\u30b5\u30a4\u30ba\uff0863.8MB\uff09\u306e\u7d0426.4MB\u524a\u6e1b\u306b\u6210\u529f\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
    \"TypeScript\u306e\u30d1\u30c3\u30b1\u30fc\u30b8\u30b5\u30a4\u30ba\"
    TypeScript\u306e\u30d1\u30c3\u30b1\u30fc\u30b8\u30b5\u30a4\u30ba<\/figcaption><\/figure>\n
    TypeScript 5.0\u30684.9\u306e\u9593\u3067\u3001\u30b9\u30d4\u30fc\u30c9\u3068\u30b5\u30a4\u30ba\u306b\u304a\u3044\u3066\u3055\u3089\u306b\u8208\u5473\u6df1\u3044\u70b9\u3092\u3044\u304f\u3064\u304b\u4ee5\u4e0b\u306b\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n
    \n\n\n\n\n\n\n\n\n\n\n
    \u9805\u76ee<\/strong><\/td>\nTS 4.9\u306b\u6bd4\u8f03\u3057\u305f\u6642\u9593\u3084\u30b5\u30a4\u30ba<\/strong><\/td>\n<\/tr>\n
    \u30de\u30c6\u30ea\u30a2\u30ebUI\u30d3\u30eb\u30c9\u6642\u9593<\/td>\n90%<\/td>\n<\/tr>\n
    TypeScript Compiler\u306e\u8d77\u52d5\u6642\u9593<\/td>\n89%<\/td>\n<\/tr>\n
    Playwright\u306e\u30d3\u30eb\u30c9\u6642\u9593<\/td>\n88%<\/td>\n<\/tr>\n
    TypeScript Compiler\u306e\u30bb\u30eb\u30d5\u30d3\u30eb\u30c9\u6642\u9593<\/td>\n87%<\/td>\n<\/tr>\n
    Outlook Web\u306e\u30d3\u30eb\u30c9\u6642\u9593<\/td>\n82%<\/td>\n<\/tr>\n
    VS Code\u306e\u30d3\u30eb\u30c9\u6642\u9593<\/td>\n80%<\/td>\n<\/tr>\n
    typescript npm\u30d1\u30c3\u30b1\u30fc\u30b8\u30b5\u30a4\u30ba<\/td>\n59%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
    \u30d0\u30f3\u30c9\u30e9\u30fc\uff08\u30e2\u30b8\u30e5\u30fc\u30eb\u89e3\u6c7a\u306e\u6539\u5584\uff09<\/h3>\n
    TypeScript\u3067import\u6587\u3092\u66f8\u304f\u3068\u304d\u3001\u30b3\u30f3\u30d1\u30a4\u30e9\u306fimport\u304c\u4f55\u3092\u6307\u3057\u3066\u3044\u308b\u304b\u3092\u628a\u63e1\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3092\u5b9f\u73fe\u3059\u308b\u306e\u304c\u3001\u30e2\u30b8\u30e5\u30fc\u30eb\u89e3\u6c7a\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001import { a } from \"moduleA\"<\/code>\u3068\u66f8\u304f\u3068\u3001\u30b3\u30f3\u30d1\u30a4\u30e9\u306fmoduleA<\/code>\u306ea<\/code>\u306e\u5b9a\u7fa9\u3092\u7406\u89e3\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
    TypeScript 4.7 \u3067\u306f\u3001--module<\/code>\u3068moduleResolution<\/code>\u306e\u8a2d\u5b9a\u306b\u3001node16<\/code>\u3068nodenext<\/code>\u3068\u3044\u30462\u3064\u306e\u65b0\u3057\u3044\u30aa\u30d7\u30b7\u30e7\u30f3\u304c\u8ffd\u52a0\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n
    \u3053\u308c\u3089\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u306e\u76ee\u7684\u306f\u3001Node.js<\/a>\u306eECMAScript\u30e2\u30b8\u30e5\u30fc\u30eb\u306e\u6b63\u78ba\u306a\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u30eb\u30fc\u30eb\u3092\u3088\u308a\u6b63\u78ba\u306b\u8868\u73fe\u3059\u308b\u3053\u3068\u3067\u3057\u305f\u3002\u3057\u304b\u3057\u3001\u3053\u306e\u30e2\u30fc\u30c9\u306b\u306f\u3001\u4ed6\u306e\u30c4\u30fc\u30eb\u3067\u306f\u5f37\u5236\u3055\u308c\u306a\u3044\u5236\u7d04\u304c\u8907\u6570\u3042\u308a\u307e\u3059\u3002<\/p>\n
    \u4f8b\u3048\u3070\u3001Node.js\u306eECMAScript\u30e2\u30b8\u30e5\u30fc\u30eb\u3067\u306f\u3001\u76f8\u5bfe\u7684\u306a\u30a4\u30f3\u30dd\u30fc\u30c8\u304c\u6b63\u3057\u304f\u52d5\u4f5c\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u30d5\u30a1\u30a4\u30eb\u62e1\u5f35\u5b50\u3092\u660e\u78ba\u306b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
    import * as utils from \".\/utils\"; \/\/ Wrong \n\nimport * as utils from \".\/utils.mjs\"; \/\/ Correct<\/code><\/pre>\n
    \u300cmoduleResolution bundler\u300d\u3068\u3044\u3046\u65b0\u3057\u3044\u624b\u6cd5\u304c\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u308c\u306f\u3001TypeScript\u8a2d\u5b9a\u30d5\u30a1\u30a4\u30eb\u306e\u300ccompilerOptions\u300d\u30bb\u30af\u30b7\u30e7\u30f3\u306b\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u3067\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
    {\n    \"compilerOptions\": {\n        \"target\": \"esnext\",\n        \"moduleResolution\": \"bundler\"\n    }\n}<\/code><\/pre>\n
    \u3053\u306e\u624b\u6cd5\u306f\u3001Vite\u3001esbuild\u3001swc\u3001Webpack\u3001Parcel\u306a\u3069\u3001\u30cf\u30a4\u30d6\u30ea\u30c3\u30c9\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u3092\u7528\u3044\u308b\u6700\u65b0\u306e\u30d0\u30f3\u30c9\u30e9\u30fc\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u4eba\u306b\u9069\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
    TypeScript\u3067moduleResolution<\/code>\u304c\u3069\u306e\u3088\u3046\u306b\u52d5\u4f5c\u3059\u308b\u304b\u306b\u3064\u3044\u3066\u306f\u3001\u5143\u306e\u30d7\u30eb\u30ea\u30af\u30a8\u30b9\u30c8\u3068\u305d\u306e\u5b9f\u88c5\u306b\u3064\u3044\u3066\u306e\u8aac\u660e<\/a>\u3092\u3054\u78ba\u8a8d\u304f\u3060\u3055\u3044\u3002<\/p>\n
    \u975e\u63a8\u5968\u4e8b\u9805<\/h2>\n
    TypeScript 5.0\u306b\u306f\u3001\u30e9\u30f3\u30bf\u30a4\u30e0\u306e\u8981\u4ef6\u3001lib.d.ts\u306e\u5909\u66f4\u3001API<\/a>\u306e\u5909\u66f4\u306a\u3069\u3001\u3044\u304f\u3064\u304b\u306e\u975e\u63a8\u5968\u4e8b\u9805\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
      \n
    1. \u30e9\u30f3\u30bf\u30a4\u30e0<\/strong>\uff1aTypeScript\u306f\u73fe\u5728\u3001ECMAScript 2018\u3092\u30bf\u30fc\u30b2\u30c3\u30c8\u3068\u3057\u3066\u304a\u308a\u3001\u30d1\u30c3\u30b1\u30fc\u30b8\u3067\u306f\u30a8\u30f3\u30b8\u30f3\u306e\u671f\u5f85\u5024\u3068\u3057\u306612.20\u3092\u6700\u4f4e\u9650\u306e\u6761\u4ef6\u3068\u5b9a\u3081\u3066\u3044\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001Node.js\u5229\u7528\u8005\u306f\u3001TypeScript 5.0\u3092\u4f7f\u7528\u3059\u308b\u305f\u3081\u306b\u6700\u4f4e\u3067\u308212.20\u4ee5\u964d\u3092\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n
    2. lib.d.ts<\/strong>\uff1aDOM\u306e\u578b\u306e\u751f\u6210\u65b9\u6cd5\u306b\u3044\u304f\u3064\u304b\u5909\u66f4\u304c\u3042\u308a\u3001\u65e2\u5b58\u306e\u30b3\u30fc\u30c9\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u7279\u306b\u3001\u7279\u5b9a\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u6570\u5024\u304b\u3089\u6570\u5024\u30ea\u30c6\u30e9\u30eb\u578b\u306b\u5909\u63db\u3055\u308c\u3001\u30ab\u30c3\u30c8\u3001\u30b3\u30d4\u30fc\u3001\u30da\u30fc\u30b9\u30c8\u306e\u30a4\u30d9\u30f3\u30c8\u51e6\u7406\u30d7\u30ed\u30d1\u30c6\u30a3\u3068\u30e1\u30bd\u30c3\u30c9\u304c\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u8d8a\u3048\u3066\u79fb\u52d5\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\n
    3. API<\/strong>\uff1a\u4e00\u90e8\u306e\u4e0d\u8981\u306a\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u304c\u524a\u9664\u3055\u308c\u3001\u8907\u6570\u306e\u6539\u5584\u7b56\u304c\u65bd\u3055\u308c\u307e\u3057\u305f\u3002\u307e\u305f\u3001TypeScript 5.0\u3067\u306f\u3001\u30e2\u30b8\u30e5\u30fc\u30eb\u3078\u306e\u79fb\u884c\u3082\u884c\u308f\u308c\u3066\u3044\u307e\u3059\u3002<\/li>\n<\/ol>\n
      TypeScript 5.0\u3067\u306f\u3001target: ES3<\/code>, out<\/code>, noImplicitUseStrict<\/code>, keyofStringsOnly<\/code>, suppressExcessPropertyErrors<\/code>, suppressImplicitAnyIndexErrors<\/code>, noStrictGenericChecks<\/code>, charset<\/code>, importsNotUsedAsValues<\/code>, preserveValueImports<\/code>\u3092\u542b\u3080\u7279\u5b9a\u306e\u8a2d\u5b9a\u3068\u305d\u308c\u306b\u5bfe\u5fdc\u3059\u308b\u5024\u3001\u304a\u3088\u3073\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u53c2\u7167\u306b\u304a\u3051\u308bprepend\u304c\u975e\u63a8\u5968\u3068\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n
      \u3053\u308c\u3089\u306e\u8a2d\u5b9a\u306fTypeScript 5.5\u307e\u3067\u6709\u52b9\u3067\u3059\u304c\u3001\u307e\u3060\u4f7f\u7528\u3057\u3066\u3044\u308b\u30e6\u30fc\u30b6\u30fc\u306b\u306f\u6ce8\u610f\u559a\u8d77\u306e\u305f\u3081\u306e\u8b66\u544a\u304c\u51fa\u3055\u308c\u307e\u3059\u3002<\/p>\n\n
      \u307e\u3068\u3081<\/h2>\n
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      \u6b21\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u306eTypeScript\u306e\u5229\u7528\u3092\u8003\u3048\u3066\u3044\u308b\u65b9\u306f\u3001\u662f\u975e\u3068\u3082Kinsta\u306e\u30a6\u30a7\u30d6\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30b5\u30fc\u30d0\u30fc\u3092\u304a\u8a66\u3057<\/a>\u304f\u3060\u3055\u3044\u3002<\/p>\n
      TypeScript 5.0\u3067\u6700\u3082\u9b45\u529b\u7684\u3060\u3068\u601d\u3046\u6a5f\u80fd\u3084\u6539\u5584\u70b9\u306f\u4f55\u3067\u3059\u304b\uff1f\u307e\u305f\u3001\u3053\u306e\u8a18\u4e8b\u3067\u898b\u843d\u3068\u3057\u305f\u91cd\u8981\u306a\u70b9\u306f\u3042\u308a\u307e\u3059\u304b\uff1f\u30b3\u30e1\u30f3\u30c8\u6b04\u3067\u304a\u805e\u304b\u305b\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
      2023\u5e743\u670816\u65e5\u306bTypeScript 5.0\u304c …<\/p>\n","protected":false},"author":287,"featured_media":44606,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kinsta_gated_content":false,"_kinsta_gated_content_redirect":"","footnotes":""},"tags":[],"topic":[777,778],"class_list":["post-44605","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","topic-javascript-frameworks","topic-javascript-tutorials"],"yoast_head":"\n\u3010TypeScript 5.0\u306e\u65b0\u6a5f\u80fd\u3011\u5ba3\u8a00\u5b50\u3001const\u578b\u3001enum\u306e\u6539\u5584\u3001\u30b9\u30d4\u30fc\u30c9\u30a2\u30c3\u30d7\u3001\u30d0\u30f3\u30c9\u30e9\u30fc\u306a\u3069\uff5c Kinsta\u00ae<\/title>\n<meta name=\"description\" content=\"TypeScript 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