Following the guide, I came to a sorts of middlewares are there for redux application.
It is just a matter of preference around which middleware we choose. But I'm not asking for choosing a convention.
I would like to know if there are any differences between them like performance, browser support, use cases, etc. Or anything else that I'm missing with. I tried a hard research for these but not able to find any article.
So that I can consider choosing a middleware for my application. It will also be great for me to choose middleware if I know the particular use case with different middlewares.
Or, all middlewares are just conventions and I may choose any one of them for any kind of redux application (small or large)?
Redux Thunk middleware allows you to write action creators that return a function instead of an action. The thunk can be used to delay the dispatch of an action, or to dispatch only if a certain condition is met. It incorporates the methods dispatch and getState as parameters.
redux-saga is a library that aims to make application side effects (i.e. asynchronous like data fetching and impure procedures such as accessing the browser cache) in a manageable and efficient way to execute. It's simple to test as it uses the ES6 feature called generators, making the flow easy to read as synchronous code.
redux-observable is a middleware for redux that is inspired by redux-thunk. It allows developers to dispatch a function that returns an Observable, Promise or iterable of action(s). When the observable emits an action, or the promise resolves an action, or the iterable gives an action out, that action is then dispatched as usual.
And others directly from their github source:
The middleware returns a promise to the caller so that it can wait for the operation to finish before continuing. This is especially useful for server-side rendering.
Redux promise middleware enables robust handling of async action creators in Redux: it accepts a promise and dispatches pending, fulfilled and rejected actions. The middleware can also be combined with Redux Thunk to chain action creators.
redux-pack is a library that introduces promise-based middleware that allows async actions based on the lifecycle of a promise to be declarative.
Async actions in redux are often done using redux-thunk or other middlewares. The problem with this approach is that it makes it too easy to use dispatch sequentially, and dispatch multiple "actions" as the result of the same interaction/event, where they probably should have just been a single action dispatch.
This can be problematic because we are treating several dispatches as all part of a single transaction, but in reality, each dispatch causes a separate rerender of the entire component tree, where we not only pay a huge performance penalty, but also risk the redux store being in an inconsistent state.
redux-pack helps prevent us from making these mistakes, as it doesn't give us the power of a dispatch function, but allows us to do all of the things we were doing before.