Issue 502 - TypeScript 4.0, going deep into proxies, and I sunk your battleship (24)

ImmortalDB: A Resilient Key-Value Store for the Browser — Data is redundantly stored in numerous places like in cookies, IndexedDB, LocalStorage, and SessionStorage, and self heals as needed. v1.1 just came out.

Cypress 5.0: Fast and Reliable Testing for Anything That Runs in a Browser — v5.0 adds support for test retries and requires Node 10+. There’s also a migration guide if you’re coming from an earlier version.

Embla: An Extensible Low Level Carousel for the Web — We first came across this over a year ago, but this bare-bones carousel option is still seeing updates and remains a decent dependency-free option. Demos here.

BootBot: A Facebook Messenger Bot Framework — Want to create bots that work on Facebook Messenger? BootBot gives you a modular foundation, the ability to subscribe to message events, helpers to send all supported message types, etc. See some sample code to see how easy it is.

Elder.js: A Svelte-Focused Framework and Static Site Generator — An opinionated static site generator and web framework for Svelte built with SEO in mind.

TypeScript 4.0 Released — The latest major version of TypeScript, the increasingly popular superset of JavaScript that adds optional static typing, is here. No major breaking changes, but a laundry list of tweaks and smaller new features, including:

Metaprogramming with Proxies — Dr. Axel, the author of Deep JavaScript, keeps releasing extra chapters of his book for free online, and this one goes as deep into the topic of object proxies as you could ever hope. Do you need to know all of this? No. Am I glad the knowledge exists if I ever need to know? Yes!

The Definitive Introduction to Svelte with Rich Harris — Learn how the Svelte framework works, write svelte components, and take a tour through the entire Svelte API in this detailed video course.

npm v7 Now in Beta — Isaac is back bearing good news: there’s a new major beta version of npm. Run npm i -g npm@next-7 to try it now, but he notes it’s “a big one” and there are rough edges and breaking changes ahead. Trouble-free improvements are promised for most users, but this post digs into the changes.

ts-migrate: A Tool for Migrating to TypeScript at Scale — Learn about how Airbnb used codemods to accelerate migration from JavaScript to TypeScript and how their new ts-migrate tooling (GitHub repo) can help with the process.

▶  Let's Build a Multiplayer Battleship Game — A three part screencast series (by three different developers) that really digs deep into building a complete multiplayer game on both the front and back end. You’d need to commit some hours to getting through all of this, but it’s a neat collaboration and might inspire you to take part in Js13kGames!

Build a Confirmation Modal in React with State Machines — React confirmation modals can be tricky, with useEffect and keeping track of shown/hidden, loading/not, and errors. State machines make it somewhat easier.

Modern Ways of End-to-End Testing with Cypress — v5.0 of the popular testing system has just come out but this post gently demonstrates what end-to-end testing is, how it relates to other forms of testing, and how to write your first Cypress powered tests for a web app.

Understanding Destructuring, Rest Parameters, and Spread Syntax — Tania’s tutorial on understanding generators was super popular with you, so you might like this similarly deep but accessible dive into other handy features ES6/ES2015 brought us.

▶  An Overview of Higher Order Functions in JavaScript — A 10 minute screencast covering one aspect of functional programming in JavaScript.

An In-Depth Explanation of Promise.all and Comparison With Promise.allSettled — Covers both in a very gentle way – aimed at beginners.

▶  React 17’s Best New Feature: Gradual Upgrades — React 17 boasts ‘no new features’, but this isn’t entirely true – what’s new is just more subtle and will still benefit you.

Stream Chat API & JavaScript SDK for Custom Chat Apps — Build real-time chat in less time. Rapidly ship in-app messaging with our highly reliable chat infrastructure.

React JS Developer (Remote) — We’re looking for an ambitious React developer to help us make komoot the place to go to plan outdoor adventures.

Real-Time Debugging as You Code, Without Breakpoints and console.log — Wallaby catches errors in your tests and code and displays them right in your editor as you type, making your development feedback loop more productive.

Find A Job Through Vettery — Vettery specializes in dev roles and is completely free for job seekers.

JavaScript Developer at X-Team (Remote) — Join the most energizing community for developers. Work from anywhere with the world's leading brands.