/**
 * A constructed stylesheet, or on a server, a stand-in for one.
 *
 * Node has no `CSSStyleSheet`, so a sheet module that builds one at import
 * (`?css-sheet`, `urlSheet()`) used to throw the moment a server render
 * imported a component that adopts it. The stand-in keeps the css text as
 * `cssText`, which is what Lit's server renderer writes into a component's
 * declarative shadow root, so the styles arrive with the server's HTML.
 *
 * Shared by `css.ts` and `css-build.ts`; dependency-free like them.
 *
 * @module
 */
/** Whether constructed sheets don't exist here: a server render. */
export declare const noSheets: () => boolean;
/** `new CSSStyleSheet()`, or {@link ServerSheet} where there is none. */
export declare const newSheet: () => CSSStyleSheet;
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