Why EVT ?
'evt' is intended to be a replacement for 'events'.
It enables and encourages functional programming and makes heavy use of typescript's type inference features to provide type safety while keeping things concise and elegant 🍸.
Suitable for any JS runtime env (deno, node, old browser, react-native ...)
✅ Lightweight, no dependency.
✅ No polyfills needed, the NPM module is transpiled down to ES3.
Can be imported in TypeScript projects using version >= 3.4 (Mar 2019) and in any plain JS projects.
Motivation
There are a lot of things that can't easily be done with EventEmitter:
Enforcing type safety.
Removing a particular listener ( if the callback is an anonymous function ).
Adding a one-time listener for the next event that meets a condition.
Waiting (via a Promise) for one thing or another to happen.
Example: waiting at most one second for the next message, stop waiting if the socket disconnects.
Why would someone pick EVT over RxJS:
RxJS introduces a lot of abstractions. It's a big jump from
EventEmitter.It is often needed to resort to custom type guards, the filter operator breaks the type inference.
Tend to be quite verbose.
It could be months before it eventually supports Deno.
There is no official guideline on how to integrate it with React.
EVT is an attempt to build a lib as accessible as the EventEmitter yet much more powerfull.
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