ts-blank-space
What is ts-blank-space? ts-blank-space is a fast type-stripping compiler that converts TypeScript to JavaScript. It supports a modern subset of TypeScript by erasing the types and replacing them with whitespace. That's it. It is not a type checker and does not perform any other code transformations. The underlying technique can improve build performance and simplify development. The implementation
JavaScript Visualized - Promise Execution
Promises in JavaScript can seem a bit daunting at first, but understanding what's happening under the hood can make them much more approachable. In this blog post, we'll dive deep into some of the inner workings of promises and explore how they enable non-blocking asynchronous tasks in JavaScript. I'm still working on making this blog better on mobile devices, mobile browsers don't always render t
Prettier's CLI: A Performance Deep Dive · Prettier
Hey, I'm Fabio and I've been contracted by the Prettier team to speed up Prettier's command line interface (CLI). In this post we'll take a look at the optimizations I've discovered, the process that lead to finding them, some exciting numbers comparing the current CLI with the new one, and some guesses about what could be optimized next. Installation The new work-in-progress CLI for Prettier has
JavaScriptのカスタムエラーはこれでOK | Wantedly Engineer Blog
JavaScriptでは任意の値を例外としてthrowすることができますが、実際にはErrorのインスタンスをthrowするのが慣例です。 エラーの原因をより正確に説明したいときはErrorを継承するのが望ましいですが、単に継承するのではなく以下のように書くのがオススメです。 class MyError extends Error { static { this.prototype.name = "MyError"; } }その背景について以下で説明します。テーマは以下の3つです。 nameプロパティcaptureStackTracecauseプロパティnameを正しくセットするNode.jsでエラーを表示させると、クラス名が正しく表示されます。 > throw new (class C extends Error {})() Uncaught C [Error]ここで出力されている "C
Announcing Sandpack 2.0 and a Node.js runtime for any browser
Today, we are announcing Sandpack 2.0, which introduces Nodebox—a fast Node.js runtime that allows you to run server-side code in any browser. One year ago, we introduced Sandpack, an open-source in-browser bundler that allows you to run live running code examples on your website. We couldn’t have made a better decision. We knew how powerful Sandpack is (it's the bundler that powers CodeSandbox it
Package Phobia
PackagePhobiaFind the cost of adding a new dev dependency to your project Or upload a package.json What is Package Phobia?Package Phobia reports the size of an npm package before you install it. This is useful for inspecting potential dependencies or devDependencies without using up precious disk space or waiting minutes for npm install. What is "publish size" vs "install size"?The "publish size"
FrontendOps
I had recently the privilege to speak about FrontendOps at the last Thoughtworks XConf EU in UK, Germany and Spain. You can find my presentation slides here and at some point soon a video of the talk will be made available. For now if you are interested to the topic what follows is essentially my talk transcript. Update 14.11.18: a video of my talk is now available here. This article describes the
`content-visiblity` Without Jittery Scrollbars - Infrequently Noted
Alex Russell on browsers, standards, and the process of progress. Update: After further investigation, an even better solution has presented itself, which is documented in the next post. The new content-visibility CSS property finally allows browsers to intelligently decide to defer layout and rendering work for content that isn't on-screen. For pages with large DOMs, this can be transformative. I
ArmにあるというJavaScript専用命令とは何か、あるいは浮動小数点数を整数に変換する方法について - Qiita
// gcc-10 -march=armv8.3-a arm-jcvt.c という風にコンパイル #include <stdio.h> #include <math.h> #include <inttypes.h> #include <arm_acle.h> // Prototype: // int32_t __jcvt(double); #if defined(__GNUC__) __attribute__((noinline)) #endif int32_t cast_double_to_i32(double x) { return (int32_t)x; } int main(void) { printf("(int32_t)(-2.8) = %" PRId32 "\n", cast_double_to_i32(-2.8)); printf("(int32_t)1.99 = %" P
Mozilla Specification Positions
This page tracks Mozilla's positions on open Web and Web-related specifications submitted to standards bodies like the IETF, W3C, and Ecma TC39. Please remember, this isn't a commitment to implement or participate; it's just what we think right now. See dev-platform to find out what we're implementing. Want Mozilla's position on a specification? Find out more. legend The possible positions are: po
Trust is good, observation is better: Intersection Observer v2 | Articles | web.dev
Trust is good, observation is better: Intersection Observer v2 Stay organized with collections Save and categorize content based on your preferences. Intersection Observer v2 adds the capability to not only observe intersections per se, but to also detect if the intersecting element was visible at the time of intersection. Intersection Observer v1 is one of those APIs that's probably universally l
現場に残る Vuex の map ヘルパーのコードベースを消し去り、 Vue 3 時代の型に追従するための CLI ツールを TypeScript Compiler API で実現する - Qiita
現場に残る Vuex の map ヘルパーのコードベースを消し去り、 Vue 3 時代の型に追従するための CLI ツールを TypeScript Compiler API で実現するJavaScriptNode.jsTypeScriptVue.jsVuex はじめに Vue.js 製アプリケーションのレガシーコードベースにおいて、頻繁に課題となるのが mapGetters のような map ヘルパーのメソッドです。 これらはショートハンド的に使えて過去には便利なケースもありましたが、現在ではほとんど利用されることもなくなりました。 それもそのはず。現在のフロントエンド開発の主流となる言語は JavaScript ではなく TypeScript となっています。しかし、 map 系ヘルパーはその構造から任意の文字列を受け取った上でオブジェクトに影響を及ぼす形となっており、根本的に型システム
core-jsがメンテされていない理由→プロジェクトは継続する - Qiita
core-jsとは core-jsをみなさんご存知だろうか。直接は知らなくてもbabelでpolyfillを当てているなら間接的にお世話になっているはずだ。 メンテされない そのcore-jsは当分メンテされないらしい。というか2020/01/14を最後にパタッと活動が途絶えている。 なんとこの巨大projectはzloirockというたった一人によってメンテされてきた。 ここで彼のコメントをいくつか引っ張っておこう。 https://github.com/zloirock/core-js/issues/548#issuecomment-494112872 2019年5月21日 4:06 JST Dear @jpike88! Almost 5 years almost every day I spend some hour for maintenance core-js. It's not
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javascript - の iterator がちょっと非力だったので - Qiita
