Femtality- -v0.16.1- By Aerisetta May 2026

function useFemtState(initial) { const s = state(initial); useEffect(() => () => s.destroy && s.destroy(), []); return s; }

function focusPulse() { const active = state(false); const pulse = transition(active, { duration: 800, loop: true }); return { attach(el) { el.addEventListener('focus', () => active.value = true); el.addEventListener('blur', () => active.value = false); // bind a CSS variable for use in styles bindStyle(el, () => ({ '--pulse': active.value ? '1' : '0' })); } }; }

import { state, transition, bindStyle } from 'femtality'; FEMTALITY- -v0.16.1- By Aerisetta

// usage const input = document.querySelector('input'); focusPulse().attach(input); CSS:

// bindText attaches to an element and updates its text content bindText(document.querySelector('#count'), count); s.destroy && s.destroy()

Example: focus-pulse behavior

React example (hooks wrapper):

const t = transition(progress, { duration: 600, easing: 'easeOutQuad' });