Today, I am writing a specification
(Basically, I am finally getting around to actually writing that specification for my JS streams design - they're streams that don't suck, and that can be parallelized safely, and that have well-defined termination behaviour, and that can interoperate with all existing types of streams, and...)
They're also environment-agnostic; they require zero special runtime features (not even ES6 Promises, any A+ implementation is fine!), and are realistically implementable from scratch (and from spec) even in a library-less environment - all you need are a bunch of object literals with 3 functions each that have some defined behaviours, basically - the system as a whole is just emergent from those properties
Oh and some of the cooler features include unbounded parallelism (without blowing up your resources!), stream forking for distributing values across multiple streams (mirroring, round-robin, latching, custom distribution, etc.)...
For those who are curious, here's a work-in-progress draft of the spec so far: https://gist.github.com/joepie91/9ced67203070051be70c2ae0cd644a30