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Browsers may throttle requestAnimationFrame
Browsers may throttle requestAnimationFramerequestAnimationFrame (rAF) is a browser API that allows the execution of code before the next available frame on the device display. All modern JavaScript animation libraries, like Framer Motion, use this API to increment the visual properties of DOM elements, 3D models, or canvas contexts to create motion on the web. However, it isn't a guarentee that t
Introducing Modular Underscore—Julian Gonggrijp
future-proof common good open source 2020-08-27 Introducing Modular Underscore Underscore has been JavaScript’s unofficial standard functional programming library for a decade (together with its major fork, Lodash). Its most recent significant development is the move to ECMAScript 6 modules (ESM). Underscore 1.11 is the first version to be fully modular. With the new modularity, you can now create
Designing a JavaScript Plugin System | CSS-Tricks
Get affordable and hassle-free WordPress hosting plans with Cloudways — start your free trial today. WordPress has plugins. jQuery has plugins. Gatsby, Eleventy, and Vue do, too. Plugins are a common feature of libraries and frameworks, and for a good reason: they allow developers to add functionality, in a safe, scalable way. This makes the core project more valuable, and it builds a community —
Introducing Danfo.js, a Pandas-like Library in JavaScript
A guest post by Rising Odegua, Independent Researcher; Stephen Oni, Data Science Nigeria Danfo.js is an open-source JavaScript library that provides high-performance, intuitive, and easy-to-use data structures for manipulating and processing structured data. Danfo.js is heavily inspired by the Python Pandas library and provides a similar interface/API. This means that users familiar with the Panda
ts-migrate: A Tool for Migrating to TypeScript at Scale
TypeScript is the official language of frontend web development at Airbnb. Yet, the process of adopting TypeScript and migrating a mature codebase containing thousands of JavaScript files didn’t happen in one day. TypeScript adoption went through the process of an initial proposal, adoption by multiple teams, a beta phase and, finally, landing as the official language of frontend development at Ai
Different versions of your site can be running at the same time
Different versions of your site can be running at the same time It's pretty easy for a user to be running an old version of your site. Not only that, but a user could be running many different versions of your site at the same time, in different tabs, and that's kinda terrifying. For instance: A user opens your site. You deploy an update. The user opens one of your links in a new tab. You deploy a
Generating UUIDs at scale on the Web
TL;DR can you trust every browser to generate globally unique identifiers at scale? At Teads, we have tried, and the answer is yes, with a few caveats. This article describes the experiments we’ve run and the discoveries we made along the way. Why we need client-side unique identifiersGenerating unique identifiers is a common need that third-party scripts integrated on Web pages and e-commerce sit
Your SPA doesn’t need a router
So you are building a client-side web app for that next big project and wondering: “Which router should I use?”. Here is the thing: you don’t need any, and you will understand why shortly. What is routing?The first interface for a user to access any website is their browser address bar. Even if your website is visited via a link or from bookmarks, for a user it still goes through the address bar.
Why SolidJS: Do we need another JS UI Library?
It has come to my attention this article is the first some people are hearing of SolidJS. If you want to learn more about Solid, this is NOT where to start. I suggest looking at the github or the links at the bottom of the article. This just details my personal journey and is highly biased. The number of times I've asked myself that over the years is staggering. Even after hitting 2k stars on Gith
Dates and Times in JavaScript
tl;dr: We are looking for feedback on the Temporal proposal. Try out the polyfill, and complete the survey; but don't use it in production yet! JavaScript Date is broken in ways that cannot be fixed without breaking the web. As the story goes, it was included in the original 10-day JavaScript engine hack and based on java.util.Date, which itself was deprecated in 1997 due to being a terrible API a
Exploring the Web Speech API
Experimenting with voice on the web using the Web Speech Synthesis and Recognition API The Web Speech API is one of those web technologies that no one ever talks about or writes about. In this blog post, we are going to take a closer look at what the API is capable of, what its limitations and strengths are, and how web developers can utilize it to enhance the user’s browsing experience. “The Web
Refactoring optional chaining into a large codebase: lessons learned • Lea Verou
Refactoring optional chaining into a large codebase: lessons learned Chinese translation by Coink Wang Now that optional chaining is supported across the board, I decided to finally refactor Mavo to use it (yes, yes, we do provide a transpiled version as well for older browsers, settle down). This is a moment I have been waiting for a long time, as I think optional chaining is the single most subs
How CommonJS is making your bundles larger | Articles | web.dev
In this post, we'll look into what CommonJS is and why it's making your JavaScript bundles larger than necessary. Summary: To ensure the bundler can successfully optimize your application, avoid depending on CommonJS modules, and use ECMAScript module syntax in your entire application. What's CommonJS? CommonJS is a standard from 2009 that established conventions for JavaScript modules. It was ini
JavaScriptライブラリを読むときのコツ
少し前からライブラリを読むトレーニングを始めたのですが、最近ようやく読み方がわかってきたので、やり始めた頃に知っておきたかったことをまとめます。 これから JavaScript/TypeScript で書かれたライブラリを読んでみようと思っている方の助けになれば嬉しいです。 「私はこういう道具を使ったり、こういう工夫をしています」みたいな感じの内容ですので、もし「もっといい読み方があるよ」みたいなのがありましたらIssueなどで教えていただきたいです。 （※ライブラリを読むにあたって、ブラウザの話と NodeJS の話があるのですが、似てる点がほとんどなのでごった煮します。） エントリポイントを探す ライブラリを読むにあたって そのライブラリが持つ module がどう協調して全体が作られるのか その関数は正確にはどういう挙動をするのか などを考えると、ユーザーから渡された入力や呼び出しが
Introducing the MDN Web Docs Front-end developer learning pathway – Mozilla Hacks - the Web developer blog
Thanks! Please check your inbox to confirm your subscription. If you haven’t previously confirmed a subscription to a Mozilla-related newsletter you may have to do so. Please check your inbox or your spam filter for an email from us. Saboya Gustavo Great initiative! Never coded before 2020, and I intend to become a front-end developer since the beginning of this year. Sometimes, my path has slowed
小さなEventEmitterライブラリ - eventmitを書いた
EventEmitterのようにPub/Subを行うeventmitという小さなライブラリを書きました。 azu/eventmit: Simple EventEmitter. A single event object per an event. eventmitは、TypeScriptで書かれています。 また、Node.jsのEventEmitterなどとは違って、イベント一つに対してeventmitのオブジェクトを一つ作成して使います。 import { eventmit } from "eventmit"; const event = eventmit<{ key: string }>(); // Register handler event.on((value) => { console.log(1, value); }); event.on((value) => { consol
SES support for ECMAScript modules
SES v0.8.0Up to this point, SES has supported evaluating scripts in the SES runtime. Since every non-trivial application has many modules, running an application previously required creating a script bundle with a tool like Browserify. We’re excited to announce the first release of SES that directly supports loading ECMAScript modules. This is the first in a series of milestones toward delivering
The Svelte Compiler Handbook | Tan Li Hau
SvelteJavaScriptcompiler Who is this for? Overview 1. Parsing source code into AST Where can I find the parser in the source code? Where can I learn about parsing in JavaScript? 2. Tracking references and dependencies a. Svelte creates a `Component` instance. b. Traverse the instance script and module script AST c. Traverse the template d. Traverse the instance script AST e. Update CSS selectors t
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Understanding Template Literals in JavaScript | DigitalOcean