Feature request: alien-signals adapter

[nickchomey]

Alien signals seems to be the fastest library around, and is also becoming quite popular (vue 3.6 will be using it).

https://github.com/transitive-bullshit/js-reactivity-benchmark

There's also a deep signals implementation if that's something useful here.

https://github.com/CCherry07/alien-deepsignals

There's also a promising version built with the tc39 signals proposal api. proposal-signals/signal-polyfill#44

[maxnowack]

I just took a look at alien signals. A possible implementation could look like this (untested):

import { signal, pauseTracking, resumeTracking } from 'alien-signals'
import { createReactivityAdapter } from '@signaldb/core'

const alienSignalsReactivityAdapter = createReactivityAdapter({
  create: () => {
    const dep = signal(0)
    return {
      depend: () => {
        // eslint-disable-next-line @typescript-eslint/no-unused-expressions
        dep()
      },
      notify: () => {
        pauseTracking()
        const currentValue = dep()
        resumeTracking()
        dep(currentValue + 1)
      },
    }
  },
  isInScope: undefined,
  onDispose: undefined,
})

export default alienSignalsReactivityAdapter

However, it seems like the current implementation doesn't offer a way to check whether the current code runs inside of a reactive scope, nor a way to clean up things after a reactive scope is closed. Therefore, I would consider this as "experimental."