xest

Modern Reactive Programming

What is it?

On the surface, xest is an event sourcing database with bindings for popular UI frameworks. It stores and indexes published messages and allows efficient querying of those messages using a query language heavily inspired by ReactiveX. Its UI bindings allow simple, component level access to the event store and intuitive "scoping" of queries. It even comes with a query analyzer!

Digging a little deeper, xest represents a fundamental shift in the way we model data in our applications. By swapping the fundamental unit of data from SQL tables or NoSQL documents to messages or events, a number of benefits become apparent.

• Queries are inherently real-time. All of them, all the time.
• Vastly less complexity and code. No boilerplate. Persistence just happens.
• Workflows and processes can be modelled visually.
• Everything starts to become "declarative".
• The entire history of every action taken in the system is available for analysis.

xest enables all this by providing:

• a lightweight "run anywhere" host and low configuration consumer,
• a simple core expression language focused on extensibility and reuse,
• higher order components and hooks for React (more frameworks coming),
• workflows and processes built on the xstate library (coming soon!),
• out of the box authentication providers.

A Glimpse...

Simple but powerful query language heavily inspired by Rx, and simple React bindings that keep your UI up to date

Model workflows visually using xstate tools

Documentation

For newcomers, both reactive programming noobs and Rx afficionados, we recommend running through the getting started guide (video tutorial coming soon!)

To get up and running quickly, follow the instructions in the bundle documentation.

API documentation is available on the documentation site.

Packages

@xest/bundle	Host process and socket framework bundle
@xest/core	Core expression language and serialization mechanisms
@xest/devtools	Development tools (query runner)
@xest/fsm	State machine tools
@xest/host	"Run anywhere" host process
@xest/react	Higher order components and hooks for React
@x/socket	Reliable observable socket framework
@x/socket.auth	Authentication middleware for @x/socket
@x/socket.xest	@xest/host optimizations as middleware for @x/socket