Find unused files, dependencies and exports in JavaScript and TypeScript projects
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Find unused files, dependencies and exports in JavaScript and TypeScript projects
Open source hooliganism and the TypeScript meltdown
September 7, 2023 Open source hooliganism and the TypeScript meltdown I've seen a lot of true believers argue for virtues of their favorite paradigms and methods over the decades working in software. And mostly, I look at people with a passionate preference and smile. Isn't it great that people care so much about their craft that they volunteer to extol the benefits of their favorite tools! Yes it
My new error...
2023 年度ã®åƒ•ã®ã‚¨ãƒ©ãƒ¼ãƒãƒ³ãƒ‰ãƒªãƒ³ã‚° ã«ã¤ã„ã¦æ›¸ããŸã„。 昨日Safe Data Fetching in Modern JavaScriptã‚’èªã‚“ã§ã„ã¦ã€fetch ã«é™ã£ãŸè©±ã§ã¯ãªã„ãŒä¸€å®¶è¨€ã‚る内容ã ã£ãŸã®ã§æ›¸ããŸããªã£ãŸã€‚ ãŠãらãã‚„ã‚Šã™ãŽã ã¨ã‹éžåŠ¹çŽ‡ã¨è¨€ã‚れる点ã¯ã‚ã‚‹ã¨æ€ã†ã®ã§ã€ã¿ã‚“ãªã®ä¸€å®¶è¨€ã‚‚æ•™ãˆã¦æ¬²ã—ã„。 対象㯠Typescript ã§ã® サーãƒãƒ¼é–‹ç™ºæƒ³å®šã ãŒã€TS ã§ã‚ã‚Œã°ã‚¯ãƒ©ã‚¤ã‚¢ãƒ³ãƒˆé–‹ç™ºã«ã‚‚ã»ã¨ã‚“ã©ã«å½“ã¦ã¯ã¾ã‚‹è©±ã ã¨æ€ã†ã€‚ 例外ã®ã‚¹ãƒãƒ¼ã§ã¯ãªã Result 型を使ㆠResult ã¯å¤±æ•—ã™ã‚‹ã‹ã‚‚ã—ã‚Œãªã„ã¨ã„ã†æ–‡è„ˆã‚’与ãˆã¦ãれる型 エラーãƒãƒ³ãƒ‰ãƒªãƒ³ã‚°ã®æˆ¦ç•¥ã¨ã—ã¦ä¾‹å¤–を投ã’ã‚‹ã®ã§ã¯ãªãã€Result åž‹ã‚’è¿”ã™ã‚„ã‚Šæ–¹ãŒã‚る。 Result åž‹ã¨ã„ã†ã®ã¯ export type Result<T, E> = Ok<T> | Err<E>; export interface Ok
JavaScript ã® undefined 㨠null を完全ã«ç†è§£ã™ã‚‹
JavaScript ã§é »å‡ºã™ã‚‹ undefined 㨠null ã«ã¤ã„ã¦èªžã‚Šã¾ã™ã€‚ 言語仕様上ã®é•ã„ JavaScript (ECMAScript) ã«ãŠã„ã¦ã€ä»•æ§˜ä¸Š undefined 㨠null ã¯å½“然ãªãŒã‚‰æ˜Žç¢ºã«åŒºåˆ¥ã•ã‚Œã¦ã„ã¾ã™ã€‚ã„ãã¤ã‹è¨€èªžä»•æ§˜ä¸Šã®æ‰±ã„ã«ã¤ã„ã¦æŒ™ã’ã¦ã¿ã¾ã™ã€‚ 比較 厳密ãªæ¯”較演算å === ã«ãŠã„㦠undefined 㨠null ã¯åŒºåˆ¥ã•ã‚Œã¾ã™ã€‚ゆるã„比較演算å == ã«ãŠã„ã¦ã¯ä¸¡è€…ã¯åŒºåˆ¥ã•ã‚Œã¾ã›ã‚“（仕様 7.2.14）。 console.log(undefined === null); // false console.log(undefined == null); // true
2022年秋版　最新React/Typescript開発環境ã®ä½œæˆ - Qiita
vite4ãŒãƒªãƒªãƒ¼ã‚¹ã•ã‚Œã¾ã—ãŸãŒã€ãƒ—ãƒã‚¸ã‚§ã‚¯ãƒˆä½œæˆæ™‚ã«ã€Œvite@latestã€ã‚’指定ã—ã¦ã„ã‚‹ãŸã‚å•é¡Œã‚ã‚Šã¾ã›ã‚“。 vite4ã¯ã€ä»¥ä¸‹ã‚’å‚ç…§ã—ã¦ãã ã•ã„。 https://vitejs.dev/blog/announcing-vite4.html ã¯ã˜ã‚ã« Reactã®é–‹ç™ºç’°å¢ƒã¯ã€CRA(Create React APP)ãŒã‚ˆã使ã‚ã‚Œã¾ã™ãŒã€CRAã¯æ²¢å±±ã®ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ã®æ•´åˆæ€§ã®ç¢ºèªãªã©ã®ãŸã‚ã€ã‚¢ãƒƒãƒ—デートãŒãƒªãƒªãƒ¼ã‚¹ã•ã‚Œã‚‹ã¾ã§ã®é–“éš”ãŒçµæ§‹ã‚ã‚Šã¾ã™ã€‚ ã¾ãŸã€ä½¿ã‚ã‚Œã¦ã„るモジュールをアップデートã™ã‚‹ã¨ã‚¨ãƒ©ãƒ¼ã«æ‚©ã¾ã•ã‚ŒãŸã‚Šã—ã¾ã™ã€‚ ゼãƒã‹ã‚‰Reactã®é–‹ç™ºç’°å¢ƒã‚’作æˆã—ã¦ã„ãŸã®ã§ã™ãŒã€ã„ã‚ã„ã‚ã¨ãƒˆãƒ©ã‚¤ã‚’ç¹°ã‚Šè¿”ã™ã†ã¡ã«ä»¥ä¸‹ã®æ–¹æ³•ã«è½ã¡ç€ãã¾ã—ãŸã€‚ 比較的çŸæ™‚é–“ã§ç’°å¢ƒãŒä½œæˆã§ãã¾ã™ã—ã€å…¨ã¦æœ€æ–°ã®ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ãŒä½¿ãˆã¾ã™ã€‚ Vite nodejsを用ã„ãŸJavaSriptプãƒã‚¸ã‚§ã‚¯ãƒˆã¯ã€ã€Webpackãªã©ã§ãƒ—
JavaScript/TypeScriptã§ç‹¬è‡ªã®ã‚¨ãƒ©ãƒ¼ã‚¯ãƒ©ã‚¹ã‚’利用ã™ã‚‹ - ãらã’ã«ãªã‚ŠãŸã„。
JavaScriptã§ã‚«ã‚¹ã‚¿ãƒ 例外クラスを作りãŸã„ãªã¨æ€ã£ãŸã‚‰ã€ ã‚ã‚“ã©ã†ã ã£ãŸã®ã§ã€ãã®æ™‚調ã¹ãŸã¨ãã®å‚™å¿˜éŒ²ã€‚ 以下ãŒã™ã”ãå‚考ã«ãªã£ãŸ(´ω｀) ãƒ»ä¾‹å¤–å‡¦ç† â€” 仕事ã§ã™ãã«ä½¿ãˆã‚‹TypeScript ドã‚ュメント カスタム例外 ã“ã‚“ãªæ„Ÿã˜ã€‚ export class CustomError extends Error { constructor(e?: string) { super(e); this.name = new.target.name; // Maintains proper stack trace for where our error was thrown (only available on V8) if (Error.captureStackTrace) { Error.captureStackTrace(this, this.constructor); } //
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ã¯ã˜ã‚㫠自分ã¯2021å¹´ã«æ–°å’ã§webç³»ã®é–‹ç™ºä¼šç¤¾ã«ãƒ•ãƒãƒ³ãƒˆã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ã¨ã—ã¦å…¥ç¤¾ã—2022å¹´ã§2å¹´ç›®ã«ãªã‚Šã¾ã™ã€‚ 実務ã§ã¯React×TypeScriptを利用ã—ãŸãƒ•ãƒãƒ³ãƒˆå‘¨ã‚Šã®é–‹ç™ºã‚’メインã§è¡Œãªã£ã¦ã„ãªã™ã€‚ 今回ã¯å®Ÿå‹™ã§Next.jsプãƒã‚¸ã‚§ã‚¯ãƒˆã«ãƒ†ã‚¹ãƒˆã‚’å°Žå…¥ã™ã‚‹ã“ã¨ã«ãªã‚Šã€ŒReact-Testing-Libraryã€ã¨ã€ŒJestã€ã«ã¤ã„ã¦æ”¹ã‚ã¦å¦ã³ç›´ã—ãŸã®ã§ãã®å†…容を紹介ã—ã¾ã™ã€‚ ã¯ã˜ã‚ã«ã€ŒReact-Testing-Libraryã€ã¨ã€ŒJestã€ã®æ¦‚è¦ã‚’説明ã—ãã®ä¸Šã§å…·ä½“çš„ãªãƒ†ã‚¹ãƒˆã‚³ãƒ¼ãƒ‰ã‚’何パターンã‹æ›¸ã„ã¦ã„ãã¾ã™ã€‚ ã“ã®è¨˜äº‹ã®å¯¾è±¡è€… フãƒãƒ³ãƒˆã‚¨ãƒ³ãƒ‰ã®ãƒ†ã‚¹ãƒˆã®æ¦‚è¦ã‚’知りãŸã„人 React-Testing-Libraryã¨Jestã«ã¤ã„ã¦çŸ¥ã‚ŠãŸã„人 具体的ãªãƒ†ã‚¹ãƒˆã®æ›¸ã方をå¦ã³ãŸã„人 ãªãŠæœ¬è¨˜äº‹ã§ã¯ã€React-Testing-Libraryã®å…·ä½“çš„ãªæ›¸ãæ–¹ã«ã¤ã„ã¦ã‚’メインã«ã—ã¦ã„ã‚‹
JavaScriptã®ES2023・ES2022ã®æ–°æ©Ÿèƒ½ã¾ã¨ã‚ - ICS MEDIA
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State of JS 2020
As crappy as 2020 was, JavaScript as a whole still managed to somehow move forward. As the language itself keeps improving thanks to new features like Optional Chaining and Nullish Coalescing, TypeScript's widespread adoption is taking things to a whole other level by popularizing static typing. And on the framework side, just when we thought things were settling down, Svelte comes in and shakes e
The State of JS 2021
多ãã®ã“ã¨ãŒã‚ã£ãŸ2021å¹´ã§ã—ãŸã€‚本当ã«ã€‚ã“ã®ã‚¢ãƒ³ã‚±ãƒ¼ãƒˆã ã£ã¦2022å¹´ã«å»¶ã³ã¦ã—ã¾ã£ãŸã‚“ã§ã™ã‹ã‚‰ï¼ より高速ãªãƒ“ルドツールや新ã—ã„ãƒãƒƒã‚¯ã‚¨ãƒ³ãƒ‰ãƒ•ãƒ¬ãƒ¼ãƒ ワークãªã©ã€JavaScriptã¯é€²åŒ–ã—続ã‘ã¦ã„ã¾ã™ã€‚ç§ãŸã¡ã‚‚ベストを尽ãã—ã€æ–°ã—ã„質å•å½¢å¼ã‚„ã€2ã¤ã®ãƒ‡ãƒ¼ã‚¿ãƒã‚¤ãƒ³ãƒˆã®ç›¸äº’å‚照機能（年åŽÃ—経験レベルãªã©ï¼‰ã€ãã—ã¦ãƒãƒ£ãƒ¼ãƒˆã®ã‚«ã‚¹ã‚¿ãƒžã‚¤ã‚ºæ©Ÿèƒ½ã¨ã€ã“ã®ã‚¢ãƒ³ã‚±ãƒ¼ãƒˆã«ãƒ‘ワーアップを施ã—ã¾ã—ãŸï¼ã»ã‹ã«ã‚‚ã‚ã‚‹ã®ã§ã€[新機能ã®ã¾ã¨ã‚]](https://dev.to/sachagreif/whats-new-in-the-2021-state-of-javascript-survey-4eej)ã‚’èªã‚“ã§ã¿ã¦ãã ã•ã„（英語）。 ã™ã¹ã¦ãŒé †é¢¨æº€å¸†ã§ã¯ã‚ã‚Šã¾ã›ã‚“ã§ã—ãŸã€‚悪ã„ã“ã¨ãŒèµ·ã“ã£ã¦ãªã•ãã†ãªã®ãŒå¹¸ã„ã§ã™ãŒã€ãƒ‡ãƒ¼ã‚¿æ¼æ´©ã«å¯¾å¿œã—ãªã„ã¨ã„ã‘ã¾ã›ã‚“ã§ã—ãŸã€‚ã¾ãŸå¼•ã続ãã€ã“ã®ã‚¢ãƒ³ã‚±ãƒ¼ãƒˆã‚’より包括的ã«ã€ã‚¢ã‚¯ã‚»ã‚·ãƒ–ル
Types vs. interfaces in TypeScript - LogRocket Blog
Leonardo Maldonado Follow Fullstack developer. JavaScript, React, TypeScript, GraphQL. The idea of having static type-checking in JavaScript is really fantastic and the adoption of TypeScript is growing more every day. You started to use TypeScript in your project, you created your first type, then you jumped to your first interface, and you got it working. You concluded that TypeScript, in fact,
interfaceã¨typeã®é•ã„ã€ãã—ã¦ä½•ã‚’使ã†ã¹ãã‹ã«ã¤ã„ã¦
始゠TSã‚’åˆã‚ã¦å‹‰å¼·ã—ãŸã¨ãã«ã€Œtypeよりinterfaceを使ã†ã‚ˆã†ã«ï¼ã€ã¨ã„ã†ãƒ–ãƒã‚°ã‚’よã見ã¾ã—ãŸãŒã€æ¥å‹™ã®æ™‚ã¯å…¨éƒ¨typeã§åž‹ã‚’定義ã—ã¦ã¾ã—ãŸã€‚ã‚れ？ã¨ç–‘念ã«æ€ã£ã¦ã¾ã—ãŸã®ã§ã€è¨˜äº‹ã§ãŠè©±ã•ã›ã¦ã„ãŸã ãã¾ã™ã€‚ 1. åž‹ã®å®šç¾© TSã§ä¸€ç•ªæ‰‹ã£å–ã‚Šæ—©ã型を定義ã§ãる方法ã¯å¤šåˆ†ã“ã‚Œã ã¨æ€ã„ã¾ã™ã€‚ let level: number = 15; level = 15 level = "å五" //Type 'string' is not assignable to type 'number' ã“ã®ã‚ˆã†ã«å®£è¨€æ™‚ã®å¤‰æ•°ã«æ–¹ã®æ³¨é‡ˆã‚’ã¤ã‘ã‚‹ã“ã¨ã‚’型アノテーション(Type Annotation)ã¨è¨€ã„ã¾ã™ã€‚上ã®ä¾‹ã ã‘見ãŸã‚‰ç‰¹ã«å•é¡Œãªã•ãã†ã«è¦‹ãˆã¾ã™ãŒã€ã‚³ãƒ¼ãƒ‰ãŒå°‘ã—ã§ã‚‚複雑ã«ãªã£ãŸã‚‰å•é¡ŒãŒã‚ã‚Šã¾ã™ã€‚
より良ã„ReactJS開発者ã«ãªã‚‹ãŸã‚ã®10ã®ãƒ’ントã¨ã‚³ãƒ„ - Qiita
より良ã„React開発者ã«ãªã‚Šã€ã‚ˆã‚Šå„ªã‚ŒãŸã‚³ãƒ¼ãƒ‰ã‚’書ãã€ã‚³ãƒ¼ãƒ‡ã‚£ãƒ³ã‚°é¢æŽ¥ã§æŠœã出るãŸã‚ã€Reactã®æŠ€é‡ã‚’改善ã™ã‚‹ã™ãã«ä½¿ãˆã‚‹çŸ¥è˜ã§ã™ã€‚ ã•ã‚ã€çš†ã•ã‚“。始ã‚ã¾ã—ょã†ã€‚ 1. Reactフックを使ã£ãŸé–¢æ•°ã‚³ãƒ³ãƒãƒ¼ãƒãƒ³ãƒˆ フックã¯React v16.8ã§å°Žå…¥ã•ã‚Œã€Reactã®é–¢æ•°åž‹ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã‚’大ããå‘上ã•ã›ã¾ã—ãŸã€‚Reactフックã§ã€ã‚¯ãƒ©ã‚¹ã‚³ãƒ³ãƒãƒ¼ãƒãƒ³ãƒˆã®ä»£ã‚ã‚Šã«é–¢æ•°ã‚³ãƒ³ãƒãƒ¼ãƒãƒ³ãƒˆãŒä½¿ãˆã¾ã™ã—ã€ä½¿ã†ã¹ãã§ã™ã€‚ã—ã‹ã—...関数コンãƒãƒ¼ãƒãƒ³ãƒˆã¨ã‚¹ãƒ†ãƒ¼ãƒˆã¨ã¯ï¼Ÿãƒ©ã‚¤ãƒ•ã‚µã‚¤ã‚¯ãƒ«ãƒ¡ã‚½ãƒƒãƒ‰ã¨ã¯ï¼Ÿ 怖ãŒã‚‹å¿…è¦ã¯ã‚ã‚Šã¾ã›ã‚“。Reactフックを使ãˆã°ã§ãã¾ã™ã€‚ 例をã„ãã¤ã‹è¦‹ã¦ã¿ã¾ã—ょã†ã€‚ ã“ã‚Œã¯ã€ã‚¯ãƒ©ã‚¹ã‚’使ã†å¾“æ¥ã®æ–¹æ³•ã§ã™ã€‚次ã®ã‚ˆã†ã«useStateフックãŒä½¿ãˆã¾ã™ã€‚ ç°¡å˜ã«è¦‹ãˆã¾ã™ã‹ï¼Ÿãã®é€šã‚Šã§ã™ï¼useStateフックを使ã£ã¦ã€åˆæœŸçŠ¶æ…‹ã‚’空ã®æ–‡å—列（''）ã«è¨å®šã—ã€ç¾åœ¨ã®çŠ¶æ…‹ï¼ˆvalue）ã¨ãã®çŠ¶æ…‹ã‚’変
2021å¹´ã«JavaScriptã‚„Node.jsを勉強ã—始ã‚ãŸã®ã§ã€èªã‚“ã§è‰¯ã‹ã£ãŸè³‡æ–™ã‚’ã¾ã¨ã‚ã‚‹
2021å¹´ã«ãªã£ã¦JavaScriptã€TypeScriptã€Node.jsã®å‹‰å¼·ã‚’始ã‚ã¾ã—ãŸã€‚ ã“ã®è¨˜äº‹ã§ã¯ã€èªã‚“ã§è‰¯ã‹ã£ãŸæœ¬ã€è¨˜äº‹ã€å…¬å¼ãƒ‰ã‚ュメントãªã©ã‚’ã¾ã¨ã‚ã¦ã„ãã¾ã™ã€‚ ※2021/03時点ã®æƒ…å ±ã§ã™ã€‚ 個人的ãªãƒªãƒ³ã‚¯é›†ã§ã™ãŒã€ã€Œã“れもèªã‚€ã¨è‰¯ã„よã€ã¨ã„ã†ã‚‚ã®ãŒã‚ã‚Œã°ãœã²æ•™ãˆã¦ãã ã•ã„。 ECMAScript ECMAScriptã®ä»•æ§˜ã¯ã€Ecmaã®TC39ã§ç–定ã•ã‚Œã¦ã„ã‚‹ Ecma TC39 GitHub organization ep78 TC39 | mozaic.fm Node.jsã®å„ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã§ã®ECMAScriptサãƒãƒ¼ãƒˆçŠ¶æ³ JavaScript Misreading Chat - #86: JavaScript: the first 20 years JavaScript 二åå¹´ã®æ´å²ã«ã¤ã„ã¦ã®å›ž JavaScript ãƒãƒ¥ãƒ¼ãƒˆãƒªã‚¢ãƒ« | MDN JavaScri
Google TypeScript Style Guide
// Good: choose between two options as appropriate (see below). import * as ng from '@angular/core'; import {Foo} from './foo'; // Only when needed: default imports. import Button from 'Button'; // Sometimes needed to import libraries for their side effects: import 'jasmine'; import '@polymer/paper-button'; Import paths TypeScript code must use paths to import other TypeScript code. Paths may be r
Effective TypeScript › The Golden Rule of Generics
The New TypeScript Handbook has some real gems in it. Here's what it has to say about generics: Writing generic functions is fun, and it can be easy to get carried away with type parameters. Having too many type parameters or using constraints where they aren't needed can make inference less successful, frustrating callers of your function. It goes on to offer a few specific pieces of advice about
TypeScript + React: Component patterns
Published on July 28, 2020 Stefan on Mastodon Reading time: 10 minutes More on TypeScript, React, Preact This list is a collection of component patterns for React when working with TypeScript. See them as an extension to the TypeScript + React Guide that deals with overall concepts and types. This list has been heavily inspired by chantastic’s original React patterns list. Contrary to chantastic’s
Denoã®ç™»å ´ã§Node.jsã®æ™‚代ã¯çµ‚ã‚ã‚‹ã®ã‹ï¼Ÿ - Qiita
Deno ver 1.0 5月13æ—¥ã€Deno v1.0ã®æ£å¼ãƒªãƒªãƒ¼ã‚¹ãŒæ±ºå®šã—ã¾ã—ãŸã€‚ å°‘ã—勉強ã—ã¦ã¿ã¾ã—ょã†ã€‚ ↑ ã‹ã‚ã„ã„ Denoã£ã¦ãªã«ï¼Ÿ Denoã¯Node.jsã®è£½ä½œè€…ã§ã‚ã‚‹Ryan Dahlã«ã‚ˆã£ã¦ä½œã‚‰ã‚Œã¾ã—ãŸã€æ–°ã—ã„JS/TSランタイムã§ã™ Denoã¯defaultã§å®‰å…¨ã§ã™ï¼ˆè¨±å¯ãªã—ã§ã¯ãƒ•ã‚¡ã‚¤ãƒ«ãƒ»ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ãƒ»ç’°å¢ƒã«ã‚¢ã‚¯ã‚»ã‚¹ã§ãã¾ã›ã‚“） Denoã¯TypeScriptãŒãƒ“ルトインã§å…¥ã£ã¦ã¾ã™ 外部パッケージã¯urlã§ã‚¤ãƒ³ãƒãƒ¼ãƒˆã§ãã¾ã™ï¼ˆGoã¿ãŸã„ã«ï¼‰ ディーノã£ã¦èªã‚€ã‚‰ã—ã„（デノã§ã¯ãªã„） DenoãŒä½œã‚‰ã‚ŒãŸèƒŒæ™¯ 一年å‰ãらã„ã«ã“ã®å‹•ç”»ã‚’見ãŸã“ã¨ã‚’æ€ã„出ã—ã¾ã—ãŸã€‚ Node.jsã®ä½œè€…ã§ã‚ã‚‹Ryan DahlãŒã€Node.jsを開発ã—ãŸå½“時ã®ä»•æ§˜ã‚’後悔ã™ã‚‹æ—¨ã®å‹•ç”»ã§ã™ã€‚ https://www.youtube.com/watch?v=M3BM9TB-8yA&t=1319s
Deno
Deno is the open-source JavaScript runtime for the modern web. Built on web standards with zero-config TypeScript, unmatched security, and a complete built-in toolchain.
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