Introduction Redux is a framework-agnostic library for global state. It’s often used with React. While I like the abstraction of Redux, React will introduce Concurrent Mode in the near future. If we want to get benefit of useTransition, state must be inside React to allow state branching. That means we can’t get the benefit with Redux. I’ve been developing React Tracked for global state that allows state branching. It works well in Concurrent Mode. ... Read More

Introduction Developing with React hooks is fun for me. I have been developing several libraries. The very first library was a library for global state. It’s naively called “react-hooks-global-state” which turns out to be too long to read. The initial version of the library was published in Oct 2018. Time has passed since then, I learned a lot, and now v1.0.0 of the library is published. https://github.com/dai-shi/react-hooks-global-state This post shows simplified versions of the code step by step. ... Read More

Introduction This is a short post about my small library. Apollo Client is a library for GraphQL. Apollo Link is an interface to extend Apollo Client. Typically, you would initialize apollo client like this. import { ApolloClient } from 'apollo-client'; import { InMemoryCache } from 'apollo-cache-inmemory'; import { HttpLink } from 'apollo-link-http'; const cache = new InMemoryCache(); const link = new HttpLink({ uri }); const client = new ApolloClient({ cache: cache, link: link, }); I want to define the link in another file and lazy load it, because it is not an HttpLink but a complicated large link. ... Read More

Introduction I have been developing React Tracked, which is a library for global state with React Hooks and Context. https://react-tracked.js.org This is a small library and focuses on only one thing. It optimizes re-renders using state usage tracking. More technically, it uses Proxies to detect the usage in render, and only triggers re-renders if necessary. Because of that, the usage of React Tracked is very straightforward. It is just like the normal useContext. ... Read More

Introduction React released Concurrent Mode in the experimental channel and Suspense for Data Fetching. This release is for library authors, and not for production apps yet. The new data fetching pattern proposed is called Render-as-You-Fetch. This post mainly discuss Render-as-You-Fetch for basic fetch calls, like calling REST APIs. But, some of discussions are not limited to REST. One could invoke GraphQL endpoints with simple fetch calls. For more complex use cases with GraphQL, it’s worth looking into Relay documentation too. ... Read More

Introduction We have been waiting for “Suspense for Data Fetching” for a long time. It is now provided as an experimental feature in the experimental channel. Check out the official docs for details. Introducing Concurrent Mode Suspense for Data Fetching Concurrent UI Patterns Adopting Concurrent Mode Concurrent Mode API Reference They are trying best to explain new mind sets with analogies. That means it’s totally different from the usage with traditional React. ... Read More

Introduction I have been developing a React Hooks library called React Tracked. This is the library I put much effort lately as well as my other libraries. https://github.com/dai-shi/react-tracked This library solves a performance issue with React Context. For those who are interested in the fundamental problem, please take a look at the long issue. What’s notable in this library is that it doesn’t provide any new fancy features. You can simply replace Context. ... Read More

Introduction It is said that Redux has been overused in some use cases and React context+hooks plays well in such use cases. While I agree with it, Redux should work well in some other situations. Redux should help developing larger apps with many developers. Various libraries in Redux ecosystem should accelerate development. There’s another situation in which Redux may help, and that is Web Workers. A while back, Surma posted a nice blog post: React + Redux + Comlink = Off-main-thread ... Read More

Introduction I have been developing several react hooks libraries. They provide custom hooks for certain purposes. One of them is for web workers. I started it for fun. I got some feedbacks and improved. This post shows the current implementation which aims the use in production. In this field, Comlink provides a nice transparent API with Proxies. Some might have already tried it with React. I have two reasons why I don’t use it for my library. ... Read More

Introduction React context and useContext are very handy. You would have no problem using it while developing a small app. If the size of your app became non-trivial, you might experience some performance issues with regard to useContext. This is because useContext will trigger rerender whenever the context value is changed. This happens even if the part of the value is not used in render. This is by design. If useContext were to conditionally trigger rerenders, the hook would become non-composable. ... Read More