/**
 * CSS tagged template utility and CSSStyleSheet caching.
 */
export type CSSResult = {
    content: string;
    toString(): string;
};
export declare const isCssResult: (value: unknown) => value is CSSResult;
export declare const css: (strings: TemplateStringsArray, ...values: Array<CSSResult | string | number>) => CSSResult;
export declare const loadStylesheet: (style: string | CSSStyleSheet | CSSResult) => CSSStyleSheet;
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