Counter with Dark Mode Toggle Only - Qwik Typing CST Test
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Counter with Dark Mode Toggle Only — Qwik Code
A simple counter with a static count but theme toggling enabled.
import { component$, useStore } from '@builder.io/qwik';
export const DarkOnlyCounter = component$(() => {
const state = useStore({ isDark: false });
return (
<div class={state.isDark ? 'dark-theme' : 'light-theme'}>
<h2>Counter: 0</h2>
<button onClick$={() => state.isDark = !state.isDark}>Toggle Theme</button>
</div>
);
});Qwik Language Guide
Qwik is a next-generation, ultra-fast web framework designed around resumability instead of hydration, enabling instant loading, fine-grained lazy execution, and optimal performance for large-scale interactive applications.
Primary Use Cases
- ▸High-performance websites
- ▸SEO-critical pages
- ▸Large apps with heavy JS footprints
- ▸E-commerce storefronts
- ▸PWAs and edge-rendered apps
Notable Features
- ▸Resumability (no hydration needed)
- ▸Qwik City routing and SSR
- ▸Fine-grained lazy-loading of everything
- ▸Streaming SSR on the edge
- ▸Optimized for Core Web Vitals
Origin & Creator
Created by Miško Hevery (creator of Angular) and developed by Builder.io, officially introduced in 2021.
Industrial Note
Qwik is ideal for ultra-performance-critical sites, marketing pages, e-commerce, dashboards, and massive interactive apps with strict Core Web Vitals budgets.