vscodeが使うTypeScript.tmLanguageに基づいて構文ハイライトを実現する - Islands in the byte stream
vscodeはTypeScriptの構文ハイライトのために TypeScript.tmLanguage という定義ファイルをもっています。 GitHub - microsoft/TypeScript-TmLanguage: TextMate grammar files for TypeScript for VS Code, Sublime Text, and Atom. この tmLanguage はもともとTextmate用の構文定義言語のようですが、vscodeプロジェクト群はこれを利用する構文ハイライトエンジンも提供しています。 GitHub - microsoft/vscode-textmate: A library that helps tokenize text using Text Mate grammars. つまりこれらを使うと、vscodeと同じ構文ハイライトを実装でき
The very first beta release of Eleventy v2.0
The very first Eleventy 2.0 Beta release is now available on the @beta channel and we’re looking for Beta testers! You can try it out now: # Local project npm install @11ty/eleventy@beta # Global install npm install @11ty/eleventy@beta -g Read more about local versus global installation. Are you new to Eleventy? Eleventy is a flexible and production-ready site generator known for its zero-client-J
Building Distributed Systems in Node
This post introduces the concept of durable execution, which is used by Stripe, Netflix, Coinbase, HashiCorp, and many others to solve a wide range of problems in distributed systems. Then it shows how simple it is to write durable code using Temporal's TypeScript/JavaScript SDK. For an updated version of this post, see durable-execution.pdf Distributed systems# When building a request-response mo
Astro 2.0 | Astro
Introducing Astro 2.0! Astro is a popular web framework for building performant, content-focused websites. Our next-gen frontend architecture (known as Astro Islands) can optimize your site to load 33% faster with 90% less JavaScript using the UI frameworks you already love like React, Svelte, and Vue. Astro 2.0 is the first major web framework to deliver complete type-safety for Markdown and MDX.
GitHub - amandaghassaei/gpu-io: A GPU-accelerated computing library for running physics simulations and other GPGPU computations in a web browser.
A GPU-accelerated computing library for running physics simulations on the web gpu-io is a WebGL library that helps you easily compose GPU-accelerated computing workflows. This library can be used for a variety of applications including real-time physics simulations, particle/agent-based simulations, cellular automata, image processing, and general purpose GPU computations. gpu-io supports renderi
Fixing a Memory Leak in a Production Node.js App
Fixing a Memory Leak in a Production Node.js AppJanuary 12th, 2023 — 15 min read A few months ago, I wrote about my migration from Postgres to SQLite. I ended that with a "to be continued" because I had a number of issues related to memory and CPU spikes that I couldn't really explain. For a while I thought it was bugs in LiteFS (which I'm using to get distributed SQLite for my distributed node ap
Why Is My Jest Suite So Slow?
Our team is a couple of months into developing a new application, and our suite of unit 240 tests takes 46 seconds to run. That duration is not excessive yet, but it’s increasing in proportion to the number of tests. In a couple of months, it’ll take a couple of minutes to run our tests. We were surprised by this, as Jest is known for its fast performance. However, while Jest reported that each te
Why Not document.write()? – CSS Wizardry
10 January, 2023 (last updated on 1 June, 2025) Why Not document.write()? Written by Harry Roberts on CSS Wizardry. Table of Contents Independent writing is brought to you via my wonderful Supporters. What Makes Scripts Slow? The Preload Scanner document.write() Hides Files From the Preload Scanner What About Async Snippets? document.write() Executes Synchronously Is It All Bad? Early document.wri
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); /
JavaScript で CPU が Intel かどうかを判定する（ついでに JIT を検知する）
先日、次のような Tweet を見かけました TIL I discovered that TensorFlow.js uses an interesting trick to sniff your CPU architecture in WebAssembly. pic.twitter.com/LVyywIM48I — Robert Knight (@robknight_) January 4, 2023 面白かったので、なぜこうなるのかの解説と、ついでにこのテクニックを使った JIT 検知方法などについて紹介します。 JavaScript における低レイヤーの扱い JavaScript においては、挙動が比較的しっかりと仕様に定められているために、環境による振る舞いの違いはあまり発生しません。しかし、低レイヤーに降りるほど振る舞いは実装依存になり、環境差が発生する余地が出てきます。 一番
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GitHub - CodeIntelligenceTesting/jazzer.js: Coverage-guided, in-process fuzzing for Node.js
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Scrollend, a new JavaScript event | Blog | Chrome for Developers
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GitHub - azu/eslint-cjs-to-esm: ESLint wrapper for migration from CJS to ESM.
GitHub - beenotung/fix-esm-import-path: Auto fix import path for esm compatibility