Introduction to AntVObservable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
Implementing single-file Web Components | CKEditor
Probably everyone who knows the Vue.js framework also heard about its single-file components. This super simple idea allows web developers to define the entire code of a component in one file. It is such a useful solution that an initiative to include this mechanism in browsers has already appeared. However, it seems quite dead as, unfortunately, no progress has been made since August 2017. Nevert
Node.jsでUnhandled Rejectionsのときにexis statusが0となる問題を回避する
Node.jsでUnhandled Rejectionsが発生してprocessが終了すると、Exit Statusが0となる問題とその対策についてのメモです。 追記： Node.js 15+からUnhandle Rejectionが発生するとプロセスがExit Status 1で終了する動作がデフォルトとなりました Node.js v15ではunhandled rejectionでプロセスがエラー終了する 事前知識: Async FunctionはPromiseを返す関数定義です。 その辺について詳しくは次のサイトを読んでください。 JavaScript Promiseの本 非同期処理:コールバック/Promise/Async Function · JavaScript Primer #jsprimer 今回のサンプルコードは次のリポジトリにあります。 azu/unhandled-rej
npmのprivate registryからGitHub Packages Registryに移行する
PLAIDでは社内のNode.jsパッケージの管理にnpm private registry(npmのregistryにprivateでパッケージをpublishする形式)を利用していました。 また、npm private registryを導入する以前の古いパッケージは、GitHubのプライベートリポジトリのURLをpackage.jsonに指定しているパッケージも混在していました。 その中で、2019年5月にGitHub Packages Registryがベータ公開されました。 Introducing GitHub Package Registry - The GitHub BlogGitHubアカウントとの統合性、GitHubリポジトリとGitHub Actionsでの連携を考えて、 社内パッケージをGitHub Packages Registryへ移行することにしました。 移行中
Bootstrap 5 release date and what's new about it - Themesberg Blog
Bootstrap has been around for more than 8 years and it is the most popular CSS Framework in the world. It powers roughly 18 million websites worldwide and these numbers are still growing. If you’re a web developer there is almost zero chance that you wouldn’t have at least heard about it. The alpha version of Bootstrap 5 has been officially launched on the 16th of June, 2020 bringing improvements
Slow Code HATES him! Optimising a web app from 1 to 60fps
Slow Code HATES him! Optimising a web app from 1 to 60fps This post explores my experience optimising a web app through iterative improvement. The app uses Svelte, but you don’t need any prior experience, and most of what I discuss applies to any web app. It follows on from Embrace your Obsessions! so if you want to learn more about Minesweeper and the context of this post, give it a read. After m
Alternatives to enums in TypeScript
A recent blog post explored how TypeScript enums work. In this blog post, we take a look at alternatives to enums. Unions of singleton values # An alternative to creating an enum that maps keys to values, is to create a union of singleton types (one per value). Read on to see how that works. Unions of string literal types # Let’s start with an enum and convert it to a union of string literal typ
ブラウザとnode.jsに両対応したライブラリを作りたいときのWebpackレシピ集 - Qiita
概要 Webpackを使ってNode.jsとブラウザに両対応したライブラリを作るときのレシピ集です いろいろなレシピを見てWebpackによるライブラリ生成の挙動を理解することを目的としています ブラウザにもNode.jsにも両対応したライブラリを作りたい ブラウザとNode.jsに両対応したいとおもったとき、 両方同時に対応した1つのバンドルjsを作る【統合型】と、 ブラウザ用、Node.js用と別々にライブラリを出し分ける【出し分け型】の2パターンある。 本稿では主に**【統合型】**について説明する ライブラリのビルドに関するWebpack設定項目 レシピ集に行く前に、 まず、ライブラリのビルドに関する設定項目をざっくりみていく。 webpack.config.js 以下のような典型的なwebpack.config.jsの中でoutput以下の項目でライブラリ生成のためのパラメータを
Rome, a new JavaScript Toolchain - JASON Format
Sebastian McKenzie, the original creator of Yarn and Babel and a member of the React Native team at Facebook, has been working on an “all-in-one” solution for JavaScript and TypeScript development. The Rome project, a reference to “all roads lead to Rome”, was made public on Feb 26th 2020. What is Rome? Rome is a from-scratch implementation of a complete JavaScript toolchain. It compiles and bundl
Metrics, Logs, and Traces in JavaScript Tools
Home Ideas Writing & Speaking About Bio, Talks, Photos Subscribe RSS, Newsletter, Mixtape I was listening to the Official AWS Podcast’s episode on Observability and was struck by how much thought has been given towards improving tools for investigating when things go wrong. I realized that we could probably have something to learn by applying this lens to the JavaScript developer experience. Note:
pzuraq | How Autotracking Works
February 26, 2020 How Autotracking Works February 26, 2020 This blog post is the third in a series on autotracking, the new reactivity system in Ember.js. I also discuss the concept of reactivity in general, and how it manifests in JavaScript. What Is Reactivity? What Makes a Good Reactive System? How Autotracking Works ← This post In the previous blog post, we discussed a number of reactivity mod
Aborting a fetch request
tldr: AbortController is used to abort a fetch request. Check out this demo. As of today, there are two primary ways to make a request in the browser. XMLHttpRequest and fetch. XMLHttpRequest existed in browsers for a long time. the fetch was introduced with ES6. XMLHttpRequest was always abortable. An abortable XHR request looks something like this. let xhr = new XMLHttpRequest(); xhr.method = 'G
JavaScript Libraries Are Almost Never Updated Once Installed
JavaScript Libraries Are Almost Never Updated Once Installed2020-01-27 Cloudflare helps run CDNJS, a very popular way of including JavaScript and other frontend resources on web pages. With the CDNJS team’s permission we collect anonymized and aggregated data from CDNJS requests which we use to understand how people build on the Internet. Our analysis today is focused on one question: once install
How to migrate from Mocha to Jest
Jest is a simple testing library that works with zero configuration. Because of its great API - if you're already using Mocha - with a few find & replace and minimal effort, you can move to Jest without rewriting any of your tests. In this post, I'll show you how I tweaked my existing Mocha setup to achieve this. If you're new to Jest, don't forget to check out their Getting Started page as well.
💡🎁 JavaScript Visualized: Generators and Iterators
DEV Community Follow A space to discuss and keep up software development and manage your software career Open Forem Follow A general discussion space for the Forem community. If it doesn't have a home elsewhere, it belongs here Future Follow News and discussion of science and technology such as AI, VR, cryptocurrency, quantum computing, and more.
Advancing the web framework ecosystem | Articles | web.dev
Chrome is an active contributor to the web framework ecosystem and our talk at Chrome Dev Summit 2019 covers what we've worked on in the past year. Read on for an extended recap of the talk with additional details and resources. How do we make the web better? The goal of everyone on the Chrome team is to make the web better. We work on improving browser APIs and V8--the core JavaScript and WebAsse
How to move your project to TypeScript - at your own pace
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Introduction to D3
https://emberigniter.com/getting-started-ember-octane-tutorial/
https://www.barbarianmeetscoding.com/blog/2019/12/29/discovering-svelte-adding-some-tasks-and-pomodoros/