/**
 * A stylesheet the component owns and rewrites at runtime, appended after the
 * component's static styles so its declarations win over them.
 */
export class AdoptedSheet {
    /** @param {string} marker  Identifies the sheet in the DOM when the fallback is used. */
    constructor(marker: string);
    /** @param {ShadowRoot | HTMLElement | DocumentFragment} root */
    attach(root: ShadowRoot | HTMLElement | DocumentFragment): void;
    /**
     * Replace the sheet's contents. Cheap to call on every update: identical CSS
     * is ignored.
     *
     * @param {string} css
     * @param {ShadowRoot | HTMLElement | DocumentFragment} root
     */
    write(css: string, root: ShadowRoot | HTMLElement | DocumentFragment): void;
    detach(): void;
    #private;
}