/**
 * Gets the value of a CSS variable on the specified element or the root element.
 * @param key - The name of the CSS variable to get.
 * @param ele - The element to get the CSS variable from. If not specified, defaults to the root element.
 * @returns The value of the CSS variable.
 * @example
 * setCssVariable('--test-color', 'red')
 * console.log(getCssVariable('--test-color'))
 *
 * @since 1.0.0
 */
declare const getCssVariable: (key: string, ele?: HTMLElement) => string;
export default getCssVariable;