`okcontract/cells` seems to be missing one of the two FRP primitives though: streams (of events).

One of the best FRP environment for JavaScript is/was FlapJax: https://en.m.wikipedia.org/wiki/Flapjax, which incorporates both the primitives and their operations.

It’s definitely not functional reactive programming, which needs to expose events and the history of events as first-order primitives, and usually a library of operations over the history of events.

If you simplify out the event stream primitive from FRP, what you are left with is not FRP.

Yes, as stated in the doc: "cells is a simplified Functional & Reactive (but not strictly FRP) library".

There were enough true FRP libraries around not to implement another one. We think cells is a sweet spot where we get most of the benefits of functional programming and reactive programming while simplifying the concepts from the original paper from Elliott and Hudak.

Rxjs, most.js and a handful of others been around for a long time.

React is also FRP, only without impure ad-hoc DOM updates :)

But this pales in comparison to the world's most successful FRP application, the spreadsheet.

Bacon.js already did FRP about 10 years ago.