// 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
JavaScriptの仕様であるECMAScriptはEcma Internationalによって定められています。ECMAScript 2015（ES6）の登場以降は、ECMAScript 2016、ECMAScript 2017･･･と、年次で仕様が更新されています。ECMAScript 2022（ES2022）は2022年6月22日のEcma InternationalのGA 123rd meetingにて、ECMAScript 2023（ES2023）は2023年6月27日のGA 125th meetingで承認されました。 ES2022とES2023はすでに多くのブラウザやNode.js環境で利用可能です。本記事では新仕様と使いどころを紹介します。 ES2023 - 配列の非破壊操作 ES2023では配列を非破壊で操作できるメソッドが追加されています。非破壊とは、元の配列を変更せ
Over the past few months, during the lead-up to the TypeScript 5.0 beta, our team spent a good portion of our time looking for ways to improve the performance of our compiler so that your projects build faster. One of the ways we improved was by looking into an oft overlooked aspect of many JavaScript VMs: inline caching. A Brief Primer on Inline Caching Inline caching is an optimization often use
WebKit Features in Safari 16.4
Mar 27, 2023 by Patrick Angle, Marcos Caceres, Razvan Caliman, Jon Davis, Brady Eidson, Timothy Hatcher, Ryosuke Niwa, and Jen Simmons ContentsWeb Push on iOS and iPadOSImprovements for Web AppsWeb ComponentsCSSHTMLJavaScript and WebAssemblyWeb APIImages, Video, and AudioWKWebViewDeveloper ToolingWeb InspectorSafari Web ExtensionsSafari Content BlockersNew Restrictions in Lockdown ModeMore Improve
JavaScript 第7版
JavaScriptは最も多くのソフトウェア開発者に使用されているプログラミング言語です。JavaScriptを包括的に解説する本書は、第6版から大幅に加筆および更新し、全面改訂しました。 はじめにJavaScript言語仕様の基本的な構文と機能について豊富なサンプルコードを使って学習します。そしてJavaScript標準ライブラリを詳述し、Webブラウザで使われるクライアントサイドJavaScriptやNode.jsで使われるサーバサイドJavaScriptについてわかりやすく説明します。またNode形式と標準形式のモジュールの使い方、イテレータとジェネレータ、async/awaitやPromiseなどの非同期プログラミングの新しい構文、クラスの定義方法などを紹介し、さらにツール群や言語拡張機能、理解の難しいJavaScript特有の動きなどについても学ぶことができます。 Webプラット
`undefined` vs. `null` revisited
Many programming languages have one “non-value” called null. It indicates that a variable does not currently point to an object – for example, when it hasn’t been initialized yet. In contrast, JavaScript has two such non-values: undefined and null. In this blog post, we examine how they differ and how to best use or avoid them. undefined vs. null # Both values are very similar and often used inte
はじめに この記事では TC39 のプロトタイプ汚染周りの提案、そしてグローバルやプロトタイプのプロパティ変更に耐えるためのコードである primordials.js について紹介します。 プロトタイプ汚染とは JavaScript はプロトタイプベースの言語です。どのオブジェクトもプロトタイプ（[[Prototype]] 内部スロット）を持っており、それを辿ることで継承を表現します（プロトタイプチェーン）。 JavaScript では基本的にどのオブジェクトも凍結されておらず、好きにプロパティを追加していくことができます。かつて Prototype JavaScript Framework や MooTools というライブラリが広く使われ、ビルトインオブジェクトのプロトタイプに独自のメソッドを追加して Web サイトを開発していました。しかしオブジェクトが直接所有するプロパティとプロト
We've added JavaScript-native RPC to Cloudflare Workers
We've added JavaScript-native RPC to Cloudflare Workers2024-04-05 Cloudflare Workers now features a built-in RPC (Remote Procedure Call) system enabling seamless Worker-to-Worker and Worker-to-Durable Object communication, with almost no boilerplate. You just define a class: export class MyService extends WorkerEntrypoint { sum(a, b) { return a + b; } } And then you call it: let three = await env.
皆さんこんにちは、暑い中ですがお元気ですか？おっくんです。 去る 2021 年 7 月 13 日に Deno 1.12 がリリースされました。 今回も、リリースノートを参考に 変更事項の気になるところを紹介したいと思います。 実行環境 macOS Catalina 10.15.7 Docker イメージ denoland/deno:centos(確認時点では Deno 1.12.0 でした) Deno 1.12 Deno 1.12 での変更事項をDeno 1.12 リリースノートを元に確認します。 deno.com Web Crypto API の対応メソッドが増えました Deno 1.12 では、 以下のWeb Crypto APIの 3 つの実装が追加されました。 crypto.subtle.generateKey キー生成 crypto.subtle.sign 署名 crypto.s
WebKit Features in Safari 17.4
ContentsArchitectural improvementsWeb AppsForm elementsCSSWeb APIJavaScriptMediaSVGWebGLWeb AssemblyWeb InspectorChanges to SafariSafari ExtensionsWeb AuthenticationBug Fixes and moreUpdating to Safari 17.4Feedback Just like Safari 15.4 and Safari 16.4, this March’s release of Safari 17.4 is a significant one for web developers. We’re proud to announce another 46 features and 146 bug fixes. You ca
WebKit Features in Safari 18.0
ContentsNew in Safari 18Web apps for MacCSSSpatial WebHTMLJavaScriptWeb APICanvasManaged Media SourceWebRTCHTTPSWebGLWeb InspectorPasskeysSafari ExtensionsApple PayDeprecationsBug Fixes and moreUpdating to Safari 18.0Feedback Safari 18.0 is here. Along with iOS 18, iPadOS 18, macOS Sequoia and visionOS 2, today is the day another 53 web platform features, as well as 25 deprecations and 209 resolve
2025-05-06, Version 24.0.0 (Current), @RafaelGSS and @juanarbol We’re excited to announce the release of Node.js 24! This release brings several significant updates, including the upgrade of the V8 JavaScript engine to version 13.6 and npm to version 11. Starting with Node.js 24, support for MSVC has been removed, and ClangCL is now required to compile Node.js on Windows. The AsyncLocalStorage API
Today we’re excited to announce the release of TypeScript 5.3! If you’re not familiar with TypeScript, it’s a language that adds type syntax to JavaScript to bring type-checking. Type-checking can catch all sorts of issues like typos and forgetting to check for null and undefined. But types go beyond type-checking – the same analyses of TypeScript’s type-checker are used for rich editor tooling li
Today we’re excited to announce our Release Candidate of TypeScript 5.3! Between now and the stable release of TypeScript 5.3, we expect no further changes apart from critical bug fixes. To get started using the RC, you can get it through NuGet, or through npm with the following command: npm install -D typescript@rc Here’s a quick list of what’s new in TypeScript 5.3! Import Attributes Stable Supp
Welcome to WWDC25! We’ve got lots of exciting announcements about web technology to share with you this week. Don’t miss our seven sessions, including What’s new in Safari and WebKit. Today brings the beta of Safari 26, with 67 new features and 107 improvements. We’ll take a tour of them all in this article. But first — Safari 26? Where is Safari 19? You might have seen today during the WWDC25 Key
Prettier 3.6: Experimental fast CLI and new OXC and Hermes plugins! · Prettier
This release includes several important feature additions that we're excited to share with you. First, we're shipping a new experimental high-performance CLI behind a feature flag (--experimental-cli). This CLI was previously only available in prettier@next, but now you can enable it simply by using a flag. We encourage you to try it out and share your feedback! If you are interested in the intern
More information on the syntax and semantics of decorators (optional section) # (This section is optional. If you skip it, you can still understand the remaining content.) The syntax of decorator expressions # A decorator expression starts with a chain of one or more identifiers, separated by dots. Each identifier except the first one can be private (prefix #). Square brackets [] are not allowed
Jun 10, 2024 by Jen Simmons, Jon Davis, Karl Dubost, Anne van Kesteren, Marcos Cáceres, Ada Rose Canon, Tim Nguyen, Sanjana Aithal, Pascoe, and Garrett Davidson ContentsWebXRCSSWeb apps for MacSafari ExtensionsSpatial mediaHTMLMediaWebRTCPasskeysHTTPSJavaScriptWeb APICanvasWebGLWeb InspectorWKWebViewApple PayDeprecationsBug Fixes and moreHelp us Beta TestFeedback The last year has been a great one
WebKit Features in Safari 18.4
Mar 31, 2025 by Jen Simmons, Saron Yitbarek, Jon Davis, Razvan Caliman, Karl Dubost, Brady Eidson, Elika Etemad, Youenn Fablet, Matthew Finkel, Simon Fraser, Timothy Hatcher, David Johnson, Anne van Kesteren, Daniel Liu, Keith Miller, Rupin Mittal, Tim Nguyen, Pascoe, Abrar Rahman Protyasha, Richard Robinson, Lily Spiniolas, Brandon Stewart, John Wilander and Luming Yin ContentsDeclarative Web Pus
Today we are excited to announce the availability of TypeScript 5.3 Beta. To get started using the beta, you can get it through NuGet, or through npm with the following command: npm install -D typescript@beta Here’s a quick list of what’s new in TypeScript 5.3! Import Attributes Stable Support resolution-mode in Import Types switch (true) Narrowing Narrowing On Comparisons to Booleans instanceof N
Implementing Private Fields for JavaScript – Mozilla Hacks - the Web developer blog
This post is cross-posted from Matthew Gaudet’s blog When implementing a language feature for JavaScript, an implementer must make decisions about how the language in the specification maps to the implementation. Sometimes this is fairly simple, where the specification and implementation can share much of the same terminology and algorithms. Other times, pressures in the implementation make it mor
AuthyToOtherAuthenticator.md Exporting your 2FA tokens from Authy to transfer them into another 2FA application IMPORTANT - Update regarding deprecation of Authy desktop apps Past August 2024, Authy stopped supported the desktop version of their apps: See Authy is shutting down its desktop app | The 2FA app Authy will only be available on Android and iOS starting in August for details. And indeed,
WebKit Features in Safari 18.2
Dec 9, 2024 by Jen Simmons, Ada Rose Canon, David Degazio, Yoel Hawa, Etienne Segonzac, and John Wilander ContentsCSSSpatial videos and photosWebXRGenmojiMediaHTMLWebAssemblyWeb APIJavaScriptSecurity and PrivacyWeb InspectorWebDriverWKWebViewBug Fixes and moreUpdating to Safari 18.2Feedback Today marks the arrival of Safari 18.2. With it, WebKit adds 61 new features and 111 resolved issues. Highli
Node.js
Notable changes Add support for externally shared js builtins By default Node.js is built so that all dependencies are bundled into the Node.js binary itself. Some Node.js distributions prefer to manage dependencies externally. There are existing build options that allow dependencies with native code to be externalized. This commit adds additional options so that dependencies with JavaScript code
// 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
Building interactive web pages with Guile Hoot — Spritely Institute
Building interactive web pages with Guile HootDave Thompson — November 30, 2023 A question we frequently hear in discussions about WebAssembly (Wasm) is: "Can Wasm call the DOM (Document Object Model) API?" The answer is: Yes, thanks to Wasm Garbage Collection! In this post, we will use Guile Hoot (our Scheme to Wasm compiler) to demonstrate how a language that compiles to Wasm GC can be used to i
Web IDL Standard
Participate: GitHub whatwg/webidl (new issue, open issues) Chat on Matrix Commits: GitHub whatwg/webidl/commits Snapshot as of this commit @webidl Tests: web-platform-tests webidl/ (ongoing work) Translations (non-normative): 日本語 简体中文 한국어 Abstract This standard defines an interface definition language, Web IDL, that can be used to describe interfaces that are intended to be implemented in web brow
IntroLadybird is a relatively new browser engine originating from the SerenityOS project. Currently, it’s in pre-alpha and improving quickly. Take a look at the website and the GitHub for more information! Since the project's still in early development (SECURITY.md), bugs and vulnerabilities can be safely disclosed publicly.I’ll be researching the JavaScript engine of Ladybird, LibJS. Architecture
Here is a list of common JavaScript interview questions with detailed answers to help you prepare for the interview as a JavaScript developer. JavaScript continues to be a cornerstone of web development, powering dynamic and interactive experiences across the web. As the language evolves, so does the complexity and scope of interview questions for JavaScript developers. Whether you’re a fresher de
JSChoi.org Comparison of JavaScript dataflow proposals v1 J. S. Choi 2021-12-24 Update (2022-03-25): This original article is now out of date. There is an updated version of this article from 2022-03. There are additionally some responses to this original article: 2022-01-06 • Tab Atkins • Holistic Review of TC39 “Dataflow” Proposals 2022-01-26 • TC39 plenary meeting 2022-01-27 • HE Shi-Jun aka Jo
A History of Clojure
71 A History of Clojure RICH HICKEY, Cognitect, Inc., USA Shepherd: Mira Mezini, Technische Universität Darmstadt, Germany Clojure was designed to be a general-purpose, practical functional language, suitable for use by professionals wherever its host language, e.g., Java, would be. Initially designed in 2005 and released in 2007, Clojure is a dialect of Lisp, but is not a direct descendant of any
Node.js
Notable Changes Deprecations and Removals [f182b9b29f] - (SEMVER-MAJOR) dns: runtime deprecate type coercion of dns.lookup options (Antoine du Hamel) #39793 [4b030d0573] - doc: deprecate (doc-only) http abort related (dr-js) #36670 [36e2ffe6dc] - (SEMVER-MAJOR) module: subpath folder mappings EOL (Guy Bedford) #40121 [64287e4d45] - (SEMVER-MAJOR) module: runtime deprecate trailing slash patterns (
Server-side prototype pollution: Black-box detection without the DoS
Published: 15 February 2023 at 16:30 UTC Updated: 28 March 2023 at 09:50 UTC Server-side prototype pollution is hard to detect black-box without causing a DoS. In this post, we introduce a range of safe detection techniques, which we've also implemented in an open source Burp Suite extension. You can shortly try these out for yourself on interactive, deliberately vulnerable labs in our new Web Sec
Update 2022-12-15: New section “How will this proposal affect future JavaScript APIs?” In this blog post, we look at the ECMAScript proposal “Iterator helpers” by Gus Caplan, Michael Ficarra, Adam Vandolder, Jason Orendorff, Kevin Gibbons, and Yulia Startsev. It introduces utility methods for working with iterable data: .map(), .filter(), .take(), etc. The style of the proposed API clashes with th
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Google TypeScript Style Guide
JavaScriptのES2023・ES2022の新機能まとめ - ICS MEDIA
Introducing Deopt Explorer - TypeScript
プロトタイプ汚染周りの提案と primordials.js
Deno 1.12 へのアップデートと変更事項まとめ - 虎の穴ラボ技術ブログ
Node.js — Node.js v24.0.0 (Current)
Announcing TypeScript 5.3 - TypeScript
Announcing TypeScript 5.3 RC - TypeScript
News from WWDC25: WebKit in Safari 26 beta
JavaScript metaprogramming with the 2022-03 decorators API
News from WWDC24: WebKit in Safari 18 beta
Announcing TypeScript 5.3 Beta - TypeScript
Export TOTP tokens from Authy
Google TypeScript Style Guide
Pwning the Ladybird browser | Jess's Cafe
JavaScript Interview Questions
Comparison of ES dataflow proposals v1 (2021) • JSChoi.org
ECMAScript proposal: iterator helpers