isResolved

true while every passed derived is resolved. A derived is pending until its first value commits, and again while any re-run is awaiting a promise — isResolved is false during those windows. Reading it inside a tracking scope subscribes to the deriveds, so it re-evaluates as they settle. Useful with <Suspense/> or as a render-time guard for async-driven values that start out as undefined.

Arguments

name	type	description
...deriveds	Derived<any>[]	one or more derived values to check

Returns: boolean — true when no passed derived is pending.

Examples

Render a loading state

Async derived chains start unresolved — isResolved guards the loading state on the first render and again on every refetch the button triggers.

import { derived, isResolved, render, signal } from 'pota'

function App() {
	const id = signal(1)

	const user = derived(
		() => `https://jsonplaceholder.typicode.com/users/${id.read()}`,
		url => fetch(url),
		res => res.json(),
	)

	return (
		<div>
			<button on:click={() => id.update(n => n + 1)}>next</button>
			<p>{() => (isResolved(user) ? user().name : 'loading…')}</p>
		</div>
	)
}

render(App)