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fuel-price/.agents/skills/vueuse-functions/references/useCssVar.md
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docs: add advanced skills for Vitest, Pinia, and Vue built-ins
Add comprehensive reference documentation for:
- Vitest: environments, projects/workspaces, type testing, vi utilities
- Pinia: HMR, Nuxt integration, SSR setup
- Vue: built-in components (Transition, Teleport, Suspense, KeepAlive) and advanced directives
2026-04-11 16:28:36 +01:00

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useCssVar

Manipulate CSS variables

Usage

import { useCssVar } from '@vueuse/core'
import { useTemplateRef } from 'vue'

const el = useTemplateRef('el')
const color1 = useCssVar('--color', el)

const elv = useTemplateRef('elv')
const key = ref('--color')
const colorVal = useCssVar(key, elv)

const someEl = useTemplateRef('someEl')
const color2 = useCssVar('--color', someEl, { initialValue: '#eee' })

Type Declarations

export interface UseCssVarOptions extends ConfigurableWindow {
  initialValue?: string
  /**
   * Use MutationObserver to monitor variable changes
   * @default false
   */
  observe?: boolean
}
/**
 * Manipulate CSS variables.
 *
 * @see https://vueuse.org/useCssVar
 * @param prop
 * @param target
 * @param options
 */
export declare function useCssVar(
  prop: MaybeRefOrGetter<string | null | undefined>,
  target?: MaybeElementRef,
  options?: UseCssVarOptions,
): ShallowRef<string | undefined, string | undefined>