ESP-JS

The main export in the esp-js package is the Router. This object effectively has a one responsibility - to deterministically manage how state changes are applied to the model. It’s API allows for:

• event publishing - provides a means to publish a event (aka a JS object) to change a models state.
• event delivery - provides the ability to subscribe to events and apply event state to the model.
• model observation - provides the ability to be notified when a model changes.

The Router doesn’t know about React, OO models or immutable models, it just knows how to take an event and apply it to a handler you register for that model.

Note

In reality the various bits in esp packages provide means you don’t directly observe a model, or directly wire up a handler to have state changed. It’s useful to know that a simple event bus is a play under the coves. It is however, common to publish events directly to a model so you can changes it’s state.

The api example show these lower APIs at work.