Explicit Resource Management: Exploring JavaScript's and TypeScript's new feature | iliazeus
Explicit Resource Management: Exploring JavaScript's and TypeScript's new feature 2023-11-13 en CC BY-SA 4.0 read in russian One of my favorite new features of JavaScript and TypeScript is explicit resource management. It brings new syntax, using foobar = ..., that enables RAII, reducing boilerplate when managing the lifecycle of various resources. In this article, I will explore this feature as i
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GitHub - endojs/Jessie: Tiny subset of JavaScript for ocap-safe universal mobile code
This document is an early draft. Comments appreciated! Thanks. Today, JavaScript is the pervasive representation for (somewhat) safe mobile code. For another representation to achieve universality quickly, it must be a subset of JavaScript, and so runs at least everywhere JavaScript runs. Whereas JSON is a simple universal representation for safe mobile data, Jessie is a simple universal represent
GitHub - tc39/proposal-error-cause: TC39 proposal for accumulating errors
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JavaScript でのstructuredClone関数が Chrome98 から使えるようになりました 🎉 structuredCloneを利用する事で、簡単にオブジェクトのディープコピーができるようになりました。 すごく便利そうだな...!!と思った関数なので実際に試してみました。 structuredClone 本題のstructuredCloneです。 structuredCloneは一言で言うと「構造化複製アルゴリズムに従って、指定された値のディープクローンを生成するメソッド」です。 つまり、構造化複製アルゴリズムに対応する値はstructuredCloneを使うとディープコピーした上で値を返してくれる、と言うことです。 IE には対応していませんが、Chrome、Edge、Firefox 等の主要なブラウザは対応してきているので、Object.assignやライブラリの
Today we are excited to announce the availability of TypeScript 5.2 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 5.2! using Declarations and Explicit Resource Management Decorator Metadata Named and Anonymous Tuple Elements Easier Method Usage for Unions o
GitHub - tc39/proposal-string-dedent: TC39 Proposal to remove common leading indentation from multiline template strings
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Official name bikeshed · Issue #321 · tc39/proposal-shadowrealm
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ESNEXT CONF 2020
What's next for JavaScript? A REMOTE CONF TO FIGHT COVID-19 July 13-17, 2020 👾 A new take on the fully-remote conference. 📅 12 amazing speakers spread across 5 days. 🤝 100% of ticket proceeds donated to combat the COVID-19 pandemic: Doctors Without Borders and several other charities nominated by our speakers.
Annex B について JavaScript の言語仕様には Annex B という項目があります。ここには Web 互換性のために残されているレガシーな機能の仕様について記述してあり、新たに ECMAScript のコードを書く際にこれらの機能を使用したり、その存在を前提にしたりしてはいけないと明記されています。 String#big などの今となっては全く実用性のないメソッドや、escape, unescape 函数、もともと IE の独自実装だった String#substr などについて記述されています。 ブラウザではこれらの機能を取り除くことが出来ないので残念ながら扱うことが出来ます。また Chrome の JavaScript エンジンである V8 を使っている Node.js や Deno でも Web 互換性を重視していることもあって扱うことが出来ます。 一方で Web
JSer.info #493 - ECMAScript 2020がEcma internationalの119th General Assemblyで承認され、正式にリリースされました。 Ecma latest news Release ES2020 · tc39/ecma262 proposals/finished-proposals.md at master · tc39/proposals ECMAScript 2020では次のような変更が含まれています。 for-in mechanics - for...inやObject.keysの順番が仕様で定義された export * as ns from "mod" - 構文の追加 String.prototype.matchAll - マッチしたすべての文字列をイテレータで返す globalThis - ブラウザのwindow、Node.
はじめに JavaScript: Everything From ES2016 to ES2019のを読み、本稿はES2018で導入された機能についてわかったことを自分なりにまとめたものになります。 レスト構文とスプレッド構文(Rest/Spread)をオブジェクトにも使用可能 ES2015では、配列にスプレッド構文を使用することができました。 const name = ["taro", "ichiro", "hanako"]; const spread_name = [...name, "jiro"]; console.log(spread_name); //["taro", "ichiro", "hanako", "jiro"]
GitHub - tc39/proposal-iterator.range: A proposal for ECMAScript to add a built-in Iterator.range()
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GitHub - wessberg/cjstoesm: A tool that can transform CommonJS to ESM
This is a tool that converts CommonJS modules into tree-shakeable ES Modules. This allows you to not only bundle CommonJS modules for the browser, but also makes it possible for you to bundle them in modern tools such as Rollup. It can also be used as a tool for migrating a CommonJS-based codebase to one based on ES-modules via a simple CLI. cjstoesm can be used from the Command Line, as a JavaScr
GitHub - endojs/endo: Endo is a distributed secure JavaScript sandbox, based on SES
Endo is a JavaScript platform under development for secure communication among objects within one process and distributed between mutually suspicious machines. The foundation of Endo is Hardened JavaScript as implemented by ses, a tamper-proof JavaScript environment that allows safe execution of arbitrary programs in Compartments. Most JavaScript libraries built for Node.js, either in CommonJS or
TC39 の 86 回目のミーティングが 10/25 ~ 10/28 に開催されました。 このミーティングで議題に上がった提案と、そのステージの移動について紹介します。 agendas/10.md at master · tc39/agendas Oct 2021 · Issue #77 · babel/proposals for Stage 4 Error Cause Stage 4 になりました。ECMAScript 2022 に入ります Error Cause は、Error コンストラクタの第 2 引数に cause という値で原因となったエラーを渡すことができるようにする提案です。 キャッチする側では、error.cause で、そのエラーを取得できます。 例を示します。 doUploadJob 関数は fetch を実行して失敗したときに新しいエラーをスローします。そのエラーの
Show navigation Generally, references to objects are strongly held in JavaScript, meaning that as long you have a reference to the object, it won’t be garbage-collected. const ref = { x: 42, y: 51 }; // As long as you have access to `ref` (or any other reference to the // same object), the object won’t be garbage-collected.Currently, WeakMaps and WeakSets are the only way to kind-of-weakly referen
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reg is a package manager for native ES Modules. It's built to enable dependency management for Universal JavaScript (JavaScript that can run in the Browser and in Node.js w/o a compiler). This library is highly experimental and still likely to break without notice. DO NOT USE THIS IN PRODUCTION. Supporting Universal JavaScript is quite difficult as the Browser's module system has a very unique set
Node Modules at War: Why CommonJS and ES Modules Can’t Get Along
Dan Fabulich is a Principal Engineer at Redfin. (We’re hiring!) In Node 14, there are now two kinds of scripts: there are old-style CommonJS (CJS) scripts and new-style ESM scripts (aka MJS). CJS scripts use require() and module.exports; ESM scripts use import and export. ESM and CJS are completely different animals. Superficially, ESM looks very similar to CJS, but their implementations couldn’t
GitHub - tc39/proposal-regexp-v-flag: UTS18 set notation in regular expressions
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ECMAScript仕様書を 誰でも読めるようにする 技術を求めて yebis0942 JSConf.jp 2022
This release doesn't contain any deliberately-breaking changes. However, it contains a very complex new feature and while all of esbuild's tests pass, I would not be surprised if an important edge case turns out to be broken. So I'm releasing this as a breaking change release to avoid causing any trouble. As usual, make sure to test your code when you upgrade. Implement the JavaScript decorators p
GitHub - tc39/proposal-array-grouping: A proposal to make grouping of array items easier
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ECMAScript proposal: JSON modules
In this blog post, we examine the ECMAScript proposal “JSON modules” (by Sven Sauleau, Daniel Ehrenberg, Myles Borins, and Dan Clark). It lets us import JSON data as if it were an ECMAScript module. Why would we want to import JSON like a module? # Various bundlers (such as webpack) have allowed us to import JSON data as if it were an ECMAScript module for a long time. JSON modules turn this into
GitHub - tc39/source-map: Source map specification, RFCs and new proposals.
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Release 3.0.0: ECMAScript 2021対応 · asciidwango/js-primer
JavaScript Primerのウェブ版がECMAScript 2021に対応しました 🎉 JavaScript Primerのウェブサイトから閲覧できます。 ウェブサイト: https://jsprimer.net/ 対応のサマリIssue: ES2021の対応 · Issue #1220 · asciidwango/js-primer 昨年のES2020のリリースノート: Release 2.0.0: ECMAScript 2020対応 JavaScript Primerについて JavaScript Primerは、これからJavaScriptを学びたい人が、ECMAScript 2015以降をベースにして一からJavaScriptを学べる書籍です。 ECMAScriptの仕様は毎年アップデートされるため、JavaScript Primerも毎年それに対応できるように継続してア
In this TC39 meeting, the updates to JavaScript Classes around private state have moved to stage 4. Other proposals of note this meeting were proposals related to ArrayBuffers, notably resizable ArrayBuffers and a new proposal, introducing read-only ArrayBuffers and fixed views into ArrayBuffers. Read-only ArrayBuffers are not a new ArrayBuffer, but rather a way to freeze existing ArrayBuffers so
Ecma International approves ECMAScript 2022: What’s new? On 22 June 2022, the 123nd Ecma General Assembly approved the ECMAScript 2022 language specification, which means that it’s officially a standard now. This blog post explains what’s new. The editors of ECMAScript 2022 # The editors of this release are: Shu-yu Guo Michael Ficarra Kevin Gibbons What’s new in ECMAScript 2022? # New members of
Temporal API is Awesome · Taro
Wednesday, August 23, 2023 Dates in JS suck. Well, they suck in all languages, really. It's surprisingly hard to get right. The native Date is super limited. Sure, you can new Date('2015-10-21T01:22:00.000Z') and date.toISOString(), maybe dateA < dateB, but that's pretty much it. Need to add minutes, hours, or whatever to a date, check how many days there are until X date, etc? Good luck with that
The ECMAScript proposal “Import assertions” (by Myles Borins, Sven Sauleau, Dan Clark, and Daniel Ehrenberg) introduces syntax for associating metadata with import statements. In this blog post, we examine what that looks like and why it’s useful. Import assertions # The motivating use case for import assertions was importing JSON data as a module. That looks as follows (and is further specified
Moddable Blog | XS Update
The latest update to the XS JavaScript engine continues to focus on adapting and optimizing JavaScript for embedded systems. In this release, the majority of these improvements take place during the preload phase, part of the build process. Additionally, this release adds support for top-level await and WeakRef, two new JavaScript features expected to be part of a future standard. Finally, this re
ESLint v6.2.0 - Qiita
前 v6.1.0 | 次 v6.3.0 ESLint 6.2.0 has been released: https://t.co/L7srPm1jkE This release adds support for parsing ES2020 features (bigint, dynamic import) using the default parser! Please give it a try and let us know if you see any issues. — ESLint (@geteslint) August 18, 2019 ESLint 6.2.0 がリリースされました。 お盆休み中に ESTree 仕様が更新されたので、BigInt と Dynamic Imports 構文をサポートしました。 既知の問題: babel-eslintを利用している場合、変数の利
GitHub - tc39/proposal-import-attributes: Proposal for syntax to import ES modules with assertions
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The triple dot syntax (...) in JavaScript: rest vs. spread In JavaScript, the same syntax – triple dots (...) – is used for two different mechanisms: Rest syntax is for receiving data. Spreading is for sending data. This blog post examines how these mechanisms work and why they are not operators. Receiving data: rest syntax # A rest parameter is a special kind of parameter that receives all remai
GitHub - azu/eslint-cjs-to-esm: ESLint wrapper for migration from CJS to ESM.
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ES feature: `globalThis`
Warning: This blog post is outdated. Instead, read section “globalThis” in “JavaScript for impatient programmers”. The ECMAScript proposal “globalThis” by Jordan Harband provides a new standard way of accessing the global object. JavaScript’s global scope # JavaScript’s variable scopes are nested and form a tree whose root is the global scope. That scope is only the direct scope when a script run
ES2023 features list
ES2023 Features! Array find from last Hashbang Grammar Symbols as WeakMap keys Change array by copy Array find from last Array.prototype.findLast and Array.prototype.findLastIndex 📕 let nums = [5,4,3,2,1]; let lastEven = nums.findLast((num) => num % 2 === 0); // 2 let lastEvenIndex = nums.findLastIndex((num) => num % 2 === 0); // 3Hashbang Grammar #! for JS 📕 The first line of this script begins
GitHub - addaleax/gen-esm-wrapper: Generate ESM wrapper files for CommonJS modules
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Release v4.0.0: ES2022 · asciidwango/js-primer
structuredCloneを使ってオブジェクトをディープコピーする
Announcing TypeScript 5.2 Beta - TypeScript
ECMAScript Annex B と型定義、ついでに ES2022 __proto__
2020-06-23のJS: ECMAScript 2020リリース、Bootstrap 5 alpha、Safari 14 Beta
ES2018で追加された機能について - Qiita
NodeJS Executable Standalone Module
ECMAScriptの最新動向 2021年11月版 | サイボウズ フロントエンドエキスパートチーム
Weak references and finalizers · V8
GitHub - lukeed/tsm: TypeScript Module Loader
GitHub - mikeal/reg: Native ESM Package Manager
ECMAScript仕様書を誰でも読めるようにする技術を求めて
Release v0.21.0 · evanw/esbuild
TC39 meeting, April 19-21 2021
Ecma International approves ECMAScript 2022: What’s new?
ECMAScript proposal: Import assertions
The triple dot syntax (`...`) in JavaScript: rest vs. spread