Intlの今までとこれからJSConf JP 2023 : 2023/11/19 - https://jsconf.jp/2023/talk/ryusei-sajiki-1/
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
Fixing JavaScript Date – Getting Started
I’ve been off the blog for a while, which has to do with a lot of things going on in my life. That said, I’m happy to report that I’m back with stories about a big project – fixing the date handing in the JavaScript programming language itself! History A little backtracking here. I met Brian Terlson not too long after moving up to Redmond Washington to work for Microsoft. Brian is Microsoft’s repr
CommonJSからES Modulesへの移行する方法。トップダウンかボトムアップか
Secretlint v7でCommonJS からES Modulesへの移行を行いました。 Secretlint v7.0.0をリリースしました。Pure ESMへの書き直し この記事では、CommonJS(CJS)からES Modules(ESM)への移行を行った経緯と、移行する方法について紹介します。 CJSからESMへの移行は、率直に言えば単調な作業で、メリットが見えにくい作業です。 しかし、将来的にCJSよりもESMが主流になることは間違いないので、移行することは必要です。 移行の作業は、移行方法が決まれば大部分は機械的な書き換えが可能です。 では、実際にどうやって移行したのかを紹介します。 ESMへの移行の影響は依存元へと連鎖する Secretlintのリポジトリはmonorepoになっていて、だいたい40コぐらいのパッケージが含まれています。 そしてパッケージ間で依存関係があ
TypeScript 5.2's New Keyword: 'using'
Matt PocockMatt is a well-regarded TypeScript expert known for his ability to demystify complex TypeScript concepts. TypeScript 5.2 introduces a new keyword - using - that you can use to dispose of anything with a Symbol.dispose function when it leaves scope. { const getResource = () => { return { [Symbol.dispose]: () => { console.log('Hooray!') } } } using resource = getResource(); } // 'Hooray!'
What's new in ECMAScript 2023 | pawelgrzybek.com
After reading notes from the last TC39 meeting, it looks like the list of new features coming to JavaScript is already known. The final version of the ECMAScript specification is expected to be published at the end of June. Last and most important thing is that we are cutting ES2023. We are freezing it, or rather we have frozen it, I should say. We are not expecting any more significant editorial
JavaScript Import maps, Part 1: Introduction
We recently shipped import maps in Firefox 108 and this article is the first in a series that describes what they are and the problems they can solve. In this first article, we will go through the background and basics of import maps and follow up with a second article explaining more details of import maps. Background: JavaScript Modules If you don’t know JavaScript modules, you can read the MDN
eslint-cjs-to-esm: CJSをESMへとマイグレーションするツールを書いた
最近、色々なライブラリをCommonJS(CJS)からECMAScript Module(ESM)へとマイグレーションしています。 その際に、ESMでは__dirnameやrequireなどCommonJS特有の機能は使えなくなっています。 また、TypeScriptやBabelなど多くのツールはCJSではimport時に拡張子はなくても大丈夫ですが、ESMの場合はimport時に拡張子が必要になります。 import url from "node:url"; - import { mdEscape } from "./mdEscape"; + import { mdEscape } from "./mdEscape.js"; // ESMでは相対パスに拡張子は省略できない + const __filename = url.fileURLToPath(import.meta.url); /
ECMAScript proposal: iterator helpers
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
What is a realm in JavaScript?
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
JavaScript metaprogramming with the 2022-03 decorators API
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
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JS Decorators Explained: 10 Years Journey to the Real Implementation | Binary Studio
Release v5.0.0: ES2023/CC BYライセンスに変更/Open Collective · js-primer/js-primer
esnext/es6-module-transpiler
GitHub - tc39/proposal-promise-with-resolvers
GitHub - azu/eslint-cjs-to-esm: ESLint wrapper for migration from CJS to ESM.
GitHub - es-meta/esmeta: ECMAScript Specification (ECMA-262) Metalanguage
Release 3.26.0 - 2022.10.24 · zloirock/core-js
Intl Explorer
GitHub - node-projects/esprima-next: fork of esprima, with full ES2022 support
