import Theme, { WithVariants } from './Theme';
export declare function mergeInternal(base: Theme, other: Theme): {
    [x: string]: unknown;
};
export declare function mergeThemes<T extends Theme>(base: T, other: T): Theme;
export declare const mergeWithVariants: <TBaseTheme, TVariants extends string>(theme: WithVariants<TBaseTheme, TVariants> | undefined, ...includeVariants: TVariants[]) => TBaseTheme | undefined;