VueUse
Preferred Color Scheme:
no-preference

usePreferredColorScheme

Reactive prefers-color-scheme media query.

Usage 

import { usePreferredColorScheme } from '@vueuse/core'

const preferredColor = usePreferredColorScheme()

Component 

<UsePreferredColorScheme v-slot="{ colorScheme }">
  Preferred Color Scheme: {{ colorScheme }}
<UsePreferredColorScheme>
Learn more about component usage

Type Declarations 

export declare type ColorSchemeType = "dark" | "light" | "no-preference"
/**
 * Reactive prefers-color-scheme media query.
 *
 * @see https://vueuse.org/usePreferredColorScheme
 * @param [options]
 */
export declare function usePreferredColorScheme(
  options?: ConfigurableWindow
): ComputedRef<ColorSchemeType>

Source

Source • Demo • Docs