const { createStore, createEvent } = require('effector')
const change = createEvent('change')
const first = createStore(0)
.on(change, (state, value) => state + value)
const second = createStore(100)
.watch(first, (secondState, firstState) => console.log(secondState * firstState))
// Change first store and trigger watch in second
change(20)
Created from: https://npm.runkit.com/effector