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Registers a method that runs after initial rendering is done and the elements are mounted to the page. Ideal for using refs and managing other one-time setup that requires the

function onMount(fn: () => void): void

This is an alias for an effect that is non-tracking, meaning that it is equivalent to a createEffect with no dependencies.

// example that shoes how to use onMount to get a ref to an element
import { onMount } from "solid-js"
function MyComponent() {
let ref: HTMLDivElement
// when the component is mounted, the button will be disabled
onMount(() => {
ref.disabled = true
return <button ref={ref}>Focus me!</button>
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