declare const recordedCSSSymbol: unique symbol;
declare const isInstalledSymbol: unique symbol;
interface ExtendedCSSStyleSheetConstructor {
    new (options?: CSSStyleSheetInit): CSSStyleSheet;
    [isInstalledSymbol]?: boolean;
    prototype: CSSStyleSheet;
}
interface ExtendedWindow extends Window {
    CSSStyleSheet: ExtendedCSSStyleSheetConstructor;
}
export declare function isExtendedWindow(w: Window): w is ExtendedWindow;
export default function applyConstructedStylesPatch(win?: ExtendedWindow): void;
export { recordedCSSSymbol };
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