Learn how to design large-scale systems. Prep for the system design interview. Includes Anki flashcards.

Checking browser rendering performance regression

A behavioral analytics library that uses dom mutations and user interactions to generate aggregated insights.

Magically easy insight into the JavaScript loaded by a web app

Never-Slow Mode (a.k.a. Slightly-Fast Mode)

🚔 List of PWA Bugs and workarounds

🖼️ An Almost Ideal React Image Component

Code pattern analysis for JS

Entire React code base explanation by visual block schemes (Stack version)

Batch component for performant frequent updates (flush on count or interval)

A React utility belt for function components and higher-order components.

Tiny flux implementation built on mitt

🔧 A list of Crankshaft bailout reasons with examples

Progressive web metrics at your fingertipz

⚡ Web Debugging Proxy based on Chrome DevTools Network panel.

Console for mobile browsers

☕ The longflow manifesto

A collection of links to help answer your questions about React.js

ES6 polyfill vs. feature performance tests

An explainer page and demo of how the URL bar interacts with pages on the web

Script for running Sinopia server as demon

The Big List of Naughty Strings is a list of strings which have a high probability of causing issues when used as user-input data.

Clean Code concepts adapted for JavaScript

High-resolution JavaScript timer based on performance.mark/measure (491 bytes min+gz)

⚛️ Fast 3kB React alternative with the same modern API. Components & Virtual DOM.

Material UI: Comprehensive React component library that implements Google's Material Design. Free forever.

Telemetry dashboard for node.js apps from the terminal!

The 1.x line is frozen - features and bugfixes now happen on https://github.com/yarnpkg/berry

🔩 A collection of awesome resources for learning Service Workers