/**
 * Syntax sugar for {@link appendStyleSheet}. Injects given CSS string as global
 * stylesheet in DOM head. If `first` is true, inserts it as first stylesheet,
 * else (default) appends it.
 *
 * Returns created style DOM element.
 *
 * @param css - CSS string
 * @param first - true, if prepend to stylesheet list (else append)
 */
export declare const injectStyleSheet: (css: string, first?: boolean) => HTMLStyleElement;
/**
 * Injects given CSS string as `<style>` element and attaches it to `parent`. If
 * `first` is true, inserts it as first child, else (default) appends it.
 * Returns created style DOM element.
 *
 * @param css
 * @param parent
 * @param first
 */
export declare const appendStyleSheet: (css: string, parent: Element | ShadowRoot, first?: boolean) => HTMLStyleElement;
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