import type { ClassValue } from "clsx";
/**
 * A Base UI part's `className`: a plain string, or a function of that part's own state
 * (`open`, `transitionStatus`, `highlighted`, …).
 */
export type StateClassName<State> = string | ((state: State) => string | undefined) | undefined;
/**
 * Merge a wrapper's own classes with the caller's, keeping BOTH forms working.
 *
 * `cn()` on its own silently DROPS the function form. clsx walks strings, arrays and plain objects,
 * and a function is none of the three, so a caller styling by `open` or `transitionStatus` would
 * get an empty class and no warning. Always returning a function keeps one code path for both.
 */
export declare function mergeClassName<State>(base: ClassValue, extra: StateClassName<State>): (state: State) => string;
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