JavaScript With Syntax For Types.
TypeScript is JavaScript with syntax for types.TypeScript is a strongly typed programming language that builds on JavaScript, giving you better tooling at any scale.
TypeScript is JavaScript with syntax for types.TypeScript is a strongly typed programming language that builds on JavaScript, giving you better tooling at any scale.
TS 4.7 syntax regression: ';' expected. · Issue #48711 · microsoft/TypeScript
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(This blog post is based on a tweet thread and additional input by Mathias Bynens.) After work started on it in August 2017, May 2022 finally saw the publication of RFC 9239 “Updates to ECMAScript media types” by Matthew A. Miller, Myles Borins, Mathias Bynens, and Bradley Farias. It updates JavaScript MIME type registrations to align with reality: The JavaScript MIME type is now unambiguously tex
The ECMAScript proposal “Class static initialization blocks” by Ron Buckton is at stage 4 and scheduled to be included in ECMAScript 2022. For setting up an instance of a class, we have two constructs in JavaScript: Field: Create (and optionally initialize) instance properties. Constructor: A block of code that is executed before setup is finished. For setting up the static part of a class, we onl
GitHub - tc39/proposal-defer-import-eval: A proposal for introducing a way to defer evaluate of a module
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GitHub - tc39/proposal-atomics-microwait: Micro waits in JS
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ECMA-402 New Proposals No Data Updated Proposals No Data This diff is generated by ECMAScript Proposal Diff Tool. Agenda Agendas Babel babel/proposals: Tracking the status of Babel’s implementation of TC39 proposals Other proposal’s status tc39/proposals: Tracking ECMAScript Proposals Related services ECMAScript Proposal Diff Tool tc39/dataset: The automate track tc39 proposals
ES2022 Preview: 10 Exciting JavaScript Language Features From 2021 JavaScript evolves quickly. In 2021, several proposals have moved to Stage 4 of the TC39 process and will be included in ES2022. They add the following features to JavaScript: Classes and Instances Private instance fields, methods, and accessorsExistence checks for private fieldsPublic static class fieldsPrivate static class fields
Whenever developers try to make use of multi-threading in JavaScript — may that be Web Workers, Service Workers, Worklets like CSS Paint API or even other windows — they encounter a couple of problems. JavaScript’s inherent single-thread design prevents the sharing of memory (with the exception of SharedArrayBuffer) and as a direct result the sharing of functions and code. The typical paradigm of
What is a realm in JavaScript? 28 Oct 2022 As part of my long term research around browser JavaScript security, in the past year I have been focusing specifically on security for realms ⭐️. Due to the rise of dependencies-based development, the JavaScript ecosystem (and the browser JavaScript ecosystem in particular) is far more vulnerable to what we know as “supply chain attacks” - and the abilit
GitHub - openjdk/nashorn: https://openjdk.org/projects/nashorn
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オプショナルチェーンができるまで 〜仕様と実装〜
オプショナルチェーンができるまで 〜仕様と実装〜 Ross Kirsling ロス・カースリング
ECMAScript proposal “Change Array by copy”: four new non-destructive Array methods
ECMAScript proposal “Change Array by copy”: four new non-destructive Array methods This blog post describes the ECMAScript proposal “Change Array by copy” by Robin Ricard and Ashley Claymore. It proposes four new methods for Arrays and Typed Arrays: .toReversed() .toSorted() .toSpliced() .with() The new methods are for Arrays and TypedArrays # This blog post only demonstrates the new methods with
In this blog post, we take a look at the ECMAScript 2023 feature “Symbols as WeakMap keys” – which was proposed by Robin Ricard, Rick Button, Daniel Ehrenberg, Leo Balter, Caridy Patiño, Rick Waldron, and Ashley Claymore. What are WeakMaps good for? # The key ability of a WeakMap is to associate data with a value: The value is the key of a WeakMap entry. The data is the value of that entry. Consi
【2023/05/05 変更】 ES2023 Change Array by Copy の議論によって Array に追加するメソッドが減り、同様に Tuple から取り除かれた pushed や sorted などの独自メソッドについての記述を削除 Symbols as WeakMap keys が ES2023 となったため修正 0, -0, NaN の等価性、同値性が決まったため修正 JSON.parseImmutable が別提案としてスプリットされたため修正 支持されなかった Box についての記述を削除 JavaScript におけるイミュータブル、ミュータブル JavaScript においてプリミティブはイミュータブル、つまり変更不可能です。 一方でオブジェクトは基本的にミュータブル、つまり変更可能です。Object.freeze を使って凍結することは出来ますが、アクセサプ
Web Developer working on @kintone at @cybozu. Loves JavaScript and Curry! 🍛 Old slides: https://www.slideshare.net/teppeis/presentations
JS Decorators Explained: 10 Years Journey to the Real Implementation | Binary Studio
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Design Meeting Notes, 9/22/2021 · Issue #46012 · microsoft/TypeScript
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Symbol.species に未来はあるのか
いや、ない（反語） ES2015 から導入された @@species について ES2015 からクラス構文が導入され、ビルトインクラスを継承したクラスを簡単に作れるようになりました。 ES2015 を策定するにあたって議論となったのがビルトインクラスそのものを返すメソッドの存在です。例えばこの MyArray のインスタンスで Array#map を実行したときにその返り値は MyArray であるべきでしょうか Array であるべきでしょうか。そしてそれをどうやって Array#map に伝えればいいでしょうか。 これを制御できるようにするのが @@species という Well-known Symbol です。普通は派生クラスを返しますが、任意のクラスを返すように変更することも可能になります。 class MyArray extends Array { // 明示的に @@spe
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
GitHub - azu/eslint-cjs-to-esm: ESLint wrapper for migration from CJS to ESM.
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Show navigation The new class static initialization block syntax lets developers gather code that should run once for a given class definition and put them in a single place. Consider the following example where a pseudo-random number generator uses a static block to initialize an entropy pool once, when the class MyPRNG definition is evaluated. class MyPRNG { constructor(seed) { if (seed === unde
suin・読者3万人『サバイバルTypeScript』公開中！ on Twitter: "ECMAScriptとJavaScriptエンジンとブラウザの関係を図にしてみました。 https://t.co/KiUCqb60xr"
ECMAScriptとJavaScriptエンジンとブラウザの関係を図にしてみました。 https://t.co/KiUCqb60xr
GitHub - tc39/proposal-source-phase-imports: Proposal to enable importing modules at the source phase
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tc39/notes | DeepWiki
Overview Relevant source files .eslintrc.js .npmrc .nvmrc README.md delegates.txt meetings/2018-09/sept-25.md meetings/2019-01/jan-29.md meetings/2019-01/jan-30.md meetings/2019-01/jan-31.md meetings/2019-03/mar-26.md meetings/2019-03/mar-27.md meetings/2019-03/mar-28.md meetings/2020-02/february-4.md meetings/2020-02/february-5.md meetings/2020-02/february-6.md scripts/check-delegates-test.mjs sc
Implement the Stage 3 Decorators Proposal by rbuckton · Pull Request #50820 · microsoft/TypeScript
This implements support for the Stage 3 Decorators proposal targeting ESNext through ES5 (except where it depends on functionality not available in a specific target, such as WeakMaps for down-level private names). The following items are not currently supported: --emitDecoratorMetadata, as metadata is currently under discussion in https://github.com/tc39/proposal-decorator-metadata and has not ye
パッケージの移行 パッケージをESMなパッケージとして明示する方法は2つ .mjs の拡張子を使う package.json の type フィールドに module の値を設定する 基本的にパッケージ単位で移行すると思うので、後者の package.json の "type": "module"を設定する。 この設定をすると、パッケージ内のJavaScriptがモジュールのコンテキストで実行されるようになる。 モジュールでは常にstrict modeとなり、Node.jsのESMではrequire、exports、__dirname、__filename などが利用できなくなる。 代わりに、ES2015+のimportとexport文がモジュール構文として利用できるようになる。 JavaScript モジュール - JavaScript | MDN Differences between
![Node.jsライブラリ/ツールをESMに移行する[Node.js 12+]](https://cdn-ak-scissors.b.st-hatena.com/image/square/7e5d02dd4b4470fe1aa0b6dc49fb67aee46c2883/height=288;version=1;width=512/https%3A%2F%2Flh3.googleusercontent.com%2Fa-%2FAOh14Gh5aVg_ccNbbR5jIUsiJw7NuPCWIwaqq1-nXKs5Bw%3Ds250-c)
This blog post is about the ECMAScript proposal “Array.fromAsync for JavaScript” by J. S. Choi. It introduces a static method for converting asynchronous iterables to Arrays. Tools for working with synchronous iterables # Currently JavaScript provides several tools for working with synchronous iterables – for example: function* createSyncIterable() { yield 'a'; yield 'b'; yield 'c'; } // Array-de
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
Print version: “JavaScript for impatient programmers” (ES2019 edition) Available on: 🇺🇸 Amazon.com (USD), 🇬🇧 Amazon.co.uk (GBP), 🇩🇪 Amazon.de (EUR), 🇫🇷 Amazon.fr (EUR), 🇪🇸 Amazon.es (EUR), 🇮🇹 Amazon.it (EUR), 🇳🇱 Amazon.nl (EUR), 🇯🇵 Amazon.co.jp (JPY), 🇮🇳 Amazon.in (INR), 🇨🇦 Amazon.ca (CAD), 🇧🇷 Amazon.com.br (BRL), 🇲🇽 Amazon.com.mx (MXN), 🇦🇺 Amazon.com.au (AUD) Upgrading f
この色の2つはUnicode 15.0.0で導入されたことに伴い、ECMAScript 2023で追加される見込みです。 この色の5つはUnicode 14.0.0で導入されたことに伴い、ECMAScript 2022で追加されたものです。 この色の4つはUnicode 13.0.0で導入されたことに伴い、ECMAScript 2021で追加されたものです。 HiraganaとKatakanaはあるのにKanjiがないと思われるかもしれませんが、Han (Hani) というのが漢字のことです（「漢字」の中国語読みをローマ字化したHanziに由来）。 Unicodeのデータファイル中には時折Katakana_Or_Hiragana (Hrkt) というスクリプト名が出てくることがありますが、これは初期の頃に使われていたものの現在はどのコードポイントとも結び付けられていません（UAX #44中
GitHub - tc39/proposal-symbol-proto: TC39 proposal for mitigating prototype pollution
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GitHub - tc39/proposal-canonical-tz: TC39 Proposal (stacked on Temporal) to improve handling of changes to the IANA Time Zone Database
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The changes of proposal’s status @ 78th meeting of Ecma TC39 New Proposals Proposal Stage
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RFC 9239: Updates to ECMAScript media types
ES2022 feature: class static initialization blocks
ECMAScript proposal updates @ 2023-09
ES2022 Preview: 10 Exciting JavaScript Language Features From 2021
GitHub - tc39/proposal-module-expressions
What is a realm in JavaScript?
ECMAScript 2023 feature: symbols as WeakMap keys
イミュータブルにデータを扱うライブラリと Stage 2 Record & Tuple
Intl.MessageFormat Introduction | ドクセル
Comparison of ES dataflow proposals v1 (2021) • JSChoi.org
GitHub - tc39/proposal-composites
Class static initialization blocks · V8
Node.jsライブラリ/ツールをESMに移行する[Node.js 12+]
ECMAScript proposal: `Array.fromAsync()`
ECMAScript proposal: iterator helpers
Exploring JavaScript (ES2024 Edition)
JavaScriptのUnicode Property Escapesについての補説
ECMAScript proposal updates @ 2020-09
GitHub - tc39/proposal-promise-with-resolvers