import { type TemperatureUnit } from './units';
/** Read the persisted preference from localStorage, or null if unset/invalid. */
export declare function readStoredUnit(storageKey?: string): TemperatureUnit | null;
/** Persist an explicit choice to localStorage. */
export declare function writeStoredUnit(unit: TemperatureUnit, { storageKey }?: {
    storageKey?: string;
}): void;