export declare function addStyleSheetToRoot(root: ShadowRoot | Document, css: string, key?: string): CSSStyleSheet | HTMLStyleElement | HTMLLinkElement;
/**
 * Remove a previously added stylesheet by `key` from the given `root`.
 * Decrements the reference count and removes the stylesheet/link/style when it reaches zero.
 *
 * @param root Document or ShadowRoot where the stylesheet was added
 * @param key The key used when adding the stylesheet
 * @returns true when the stylesheet was removed (count reached 0), false if still referenced or not found
 */
export declare function removeStyleSheetFromRoot(root: ShadowRoot | Document, key: string): boolean;
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