export type CssToken = {
    css: string;
    fallback: string;
};
/**
 * Creates a CSS variable token with a fallback value.
 * The `css` string is used in real browsers (supports var()).
 * The `fallback` is used in environments that don't (e.g., jsdom in tests).
 */
export declare const cssToken: (varName: string, fallback: string) => CssToken;
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