stackblitz/alien-signals v3.2.0

on GitHub

Features

• Effect cleanup functions — Effects can now return a cleanup function that runs before each re-execution and on disposal (#113)

  effect(() => {
    const handler = () => { /* ... */ };
    document.addEventListener('click', handler);
    return () => document.removeEventListener('click', handler);
  });

Bug Fixes

• Fix checkDirty resilient to graph mutations during update (#109, #110)
• Fix effectScope not participating in propagation (#111)
• Fix inner write blocking future propagation through computed chain (#112)
• Fix dispose cleanup running inside tracking context — cleanup reads no longer create spurious dependencies

Note for Custom API Implementors

If you implement custom effect/computed execution using createReactiveSystem, you must wrap the execution body with ++runDepth / --runDepth. This counter drives the innerWrite parameter to propagate, which provides two directions of protection:

1. Self-protection — the currently-running subscriber (marked RecursedCheck) won't be re-triggered by its own write
2. Downstream protection — other subscribers are marked Recursed during inner writes, which acts as a bookmark for the propagation state machine. Without this mark, subsequent top-level writes will see stale flags and skip propagation through computed chains — this is the bug fixed in #112

Testing

Integrate reactive-framework-test-suite — a cross-framework conformance suite with 180 test cases across 13 reactive libraries. alien-signals is the only framework that passes all 180 tests (#114).