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The React Newsletter

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Animated Transitions with React Router v5
If you’re reading this, you’ve probably discovered that React Router v5 doesn’t come with a built-in solution for animated transitions. That ties into React Router’s philosophy - it gives you routing primitives that you can build on and trusts you can figure out the rest. Because every app has different needs, this approach is typically the safest. The downside of this is that it’ll take some extra work to get the exact functionality you want. The tool we’ll be using alongside React Router in this post is “React Transition Group”. React Transition Group is an animation library that gives us a way to perform animations when a React component enters or leaves the DOM. Paired with React Router, it’s the perfect tool to animate route transitions.

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Back to basics - Setting up a minimal React project from scratch
It's so easy nowadays to get a web application up and running in just a couple of minutes. We've got tools like Create-react-app, React boilerplate, Slingshot etc., which let developers set up and prototype anything blazing fast. These tools come with Webpack, Babel and more already configured for you, so you don't have to know anything about them or what they are used for.  This is obviously very valuable and cost-effective, but we also have to remember to keep in touch with our roots and get some sense of what is going on under the hood. So for today's topic we will be going back to the basics and see how we can set up most of what we need from scratch!

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Getting Started with Suspense and Concurrent Rendering in React
Recording of my React Suspense and Concurrent Rendering workshop at at React Summit 2020

React keeps on evolving and making hard things easier for the average developer.

One case, where React was not particularly hard but very repetitive, is working with AJAX request. There is always the trinity of loading, success and possible error states that had to be handled each time. But no more as the Suspense component makes life much easier.

Another case is performance of larger and complex applications. Usually React is fast enough but with a large application rendering components can conflict with user interactions. Concurrent rendering will, mostly automatically, take care of this.

You will learn all about using , showing loading indicators and handling errors. You will see how easy it is to get started with concurrent rendering. You will make suspense even more capable by combining it with concurrent rendering, the useTransition() hook and the component. 

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War stories: The move from Flow to TypeScript
8 developers, 1240 files, 102 665 lines of code. This is the story of how we translated our entire codebase from Flow to TypeScript and lived to tell the tale.

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Discovering MSW

Recently, as part of a development stack refresh for Exportify, I found myself digging around for the best approach to mocking HTTP requests in a JS test suite.

I needed something that would play nicely with Jest and React, allow me to mock requests at the transport layer so my tests could be de-coupled from the HTTP request library I chose to use, as well as of course providing a convenient DSL for writing the tests themselves.

Previously I’d written my tests using CasperJS, and Mockjax for the request mocking. I’d found the test runs to be a little unreliable, plus CasperJS is no longer actively maintained and Mockjax only actually mocks the jQuery request API, which I also planned to replace during the refresh.

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How To Build A GraphQL Server Using Next.js API Routes
This guide will teach you the basics of Next.js API Routes. We will start by explaining what they are and why API Routes are useful compared to REST or GraphQL APIs. Then, we will guide you through a step by step tutorial on how to build your very first GraphQL server with Next.js and the Github API.

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Cypress Tutorial
Tired of having users email you that your web application is broken? Using, the JavaScript End to End Testing Framework, as a quality control tool will help a lot in preventing those emails. Yet, good as it is, is not a silver bullet.
In this upcoming video course Maurice de Beijer will teach you all about using You will learn how easy it is to get started and create your first useful tests. You will also learn how to make tests for data driven applications more reliable and even faster. He will show you how to test applications using 3rd party authentications services. And you will learn how to include all that as part of your continuous integration build. Hellping you prevent errors from ever deploying.
Want to learn more? Go to and subscribe to hear about the updates and the course launch. Don’t worry, I am not going to spam you. And you can unsubscribe at any time.
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