JSer.info #679 - TypeScript 5.4 Betaがリリースされました。 Announcing TypeScript 5.4 Beta - TypeScript クロージャーにおけるNarrowing結果の改善、NoInfer Utility Typeが追加されています。 また、ES2024のObject.groupBy/Map.groupByをサポート、Import Attributesのサポートが追加されています。 そのほかには、target: "ES3"やoutオプションなどを非推奨として、次のTypeScript 5.5で削除されることがアナウンスされています。TypeScript 5.5で削除されるオプションは、次のIssueにまとめられています。 Feedback: 5.0 deprecations · Issue #51909 · microsoft/T
Published: September 30, 2022, Last updated: December 19, 2024 Common advice for keeping JavaScript apps fast tends to boil down to the following advice: "Don't block the main thread." "Break up your long tasks." This is great advice, but what work does it involve? Shipping less JavaScript is good, but does that automatically equate to more responsive user interfaces? Maybe, but maybe not. To unde
Don't let render-blocking resources block you on the road to good performance. Photo by Tim Wilson on Unsplash You might be here because Lighthouse told you to "eliminate render-blocking resources". Render-blocking resources are a common hurdle to rendering your page faster. They impact your Web Vitals which now impact your SEO. Slow render times also frustrate your users and can cause them to aba
There is no faster (pun intended) way to slow down a site than to use a bunch of JavaScript. The thing about JavaScript is you end up paying a performance tax no less than four times: The cost of downloading the file on the network The cost of parsing and compiling the uncompressed file once downloaded The cost of executing the JavaScript The memory cost The combination is very expensive. And we a
Doug Sillars (@dougsillars) is a leading mobile developer advocate and evangelist. He is widely known as an expert in mobile application architecture, especially when it comes to performance. Doug has worked with thousands of developers around the world, helping them improve the speed, battery life and customer satisfaction of their applications (both native and web). The author of O'Reilly's "Hig
Toggle dark mode No, not really. (It depends.) What does “slow” mean? I said it before, and I will say it again: If you didn’t measure it, it is not slow, and even if you measure it, the numbers are meaningless without context. That being said, the fact that people will not even consider adopting Web Workers because of their concerns about the performance of postMessage(), means that this is worth
Faster input events with Facebook’s first browser API contribution UPDATE Nov. 19, 2020: As of Chrome 87, the IsInputPending API is now available without the origin trial. The latest API incorporates a number of updates we’ve made in response to feedback from the origin trial, as well as from other members of the W3C Web Performance working group. The time it takes for an interaction to go from th
こえのブログは「声で書くブログ、声で聴くブログ、声で観るブログ」をコンセプトに書き手、読み手双方にバージョンアップしたブログを提供するアメブロの新機能です。 投稿者は端末に向かって喋るだけで、その音声が活字化されブログとして公開できます。閲覧者は活字化された文字を通常のブログと同じように読めるほか、音声を聴きながらでもコンテンツ消費できます。 モバイル端末、テレビ端末やスマートスピーカーなどの普及により、今後ますます増えると予想される利用形態に対して、それぞれに適した形でコンテンツを提供できるように挑戦しています。 この記事では、技術的な側面を中心にこえのブログを紹介します。 こえのブログは、文字でも音声でもコンテンツ消費できるのが特徴です。読者の方へのメッセージや質問に回答など利用法は様々です。龍玄としさんやクロちゃんさんなど著名人の方の声も聴けます。 できる限りサーバーにアクセスしない
February 18, 2019 How browsers schedule and execute scripts can impact the performance of web pages. While techniques like <script defer>, <link rel=preload> (and others) influence script loading, knowing how browsers interpret them can also be helpful. Thanks to Kouhei Ueno, we now have an up to date summary of script scheduling in Chrome.
One of the core decisions web developers must make is where to implement logic and rendering in their application. This can be difficult because there are so many ways to build a website. Our understanding of this space is informed by our work in Chrome talking to large sites over the past few years. Broadly speaking, we encourage developers to consider server-side rendering or static rendering ov
27 October, 2018 The Three Types of Performance Testing Written by Harry Roberts on CSS Wizardry. Table of Contents Proactive Reactive Passive What This Means for Developers What This Means for the Business A lot of companies—even if they are aware that performance is key to their business—are often unsure of how, when, or where performance testing sits within their development lifecycle. To make
Published: October 8, 2021 If you've used connection throttling in the network panel in a browser's developer tools (or Lighthouse in Chrome) to assess loading performance, you know how convenient those tools are for performance tuning. You can quickly measure the impact of performance optimizations with a consistent and stable baseline connection speed. The only problem is that this is synthetic
We are talking a lot about performance, how it can be improved, which tools to use for performance improvements but less about how to keep reached performance on a proper level. So, let’s take a look at tools which can help you to do so. Size Limit ai/size-limit Size Limit is a tool to prevent JavaScript libraries bloat. With it, you know exactly for how many kilobytes your JS library increases th
We're not totally certain what the sequence of events was, but dev.to has received a lot of positive attention/publicity in Japan in the last 12 hours or so. It has meant a lot of new members and a lot of new posts. This has been awesome and most of the posts have been great. It's also stretched us further into the territory of "how exactly do we serve the right multilingual experience". We don't
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