import { RenderProps, RuntimeStyleFunction } from './types';
type ArgTypes<T> = T extends (props: infer V) => any ? NullToObject<V> : never;
type NullToObject<T> = T extends (null | undefined) ? {} : T;
type BoxedTupleTypes<T extends any[]> = {
    [P in keyof T]: [ArgTypes<T[P]>];
}[Exclude<keyof T, keyof any[]>];
type BoxedReturnTypes<T extends any[]> = {
    [P in keyof T]: [InferReturn<T[P]>];
}[Exclude<keyof T, keyof any[]>];
type UnboxIntersection<T> = T extends {
    0: infer U;
} ? U : never;
type Arg<X, R> = RuntimeStyleFunction<X, R> | null | undefined;
type NoInfer<T> = [T, void][T extends any ? 0 : 1];
type InferReturn<T> = T extends (props: any) => infer R ? NullToObject<R> : never;
type UnionToIntersection<U> = (U extends any ? (k: U) => void : never) extends ((k: infer I) => void) ? I : never;
type InferReturnType<T extends any[]> = UnboxIntersection<UnionToIntersection<BoxedReturnTypes<T>>>;
export declare function merge<R extends RenderProps<string> = never, X = {}>(...args: Arg<NoInfer<X>, NoInfer<R>>[]): RuntimeStyleFunction<X, R>;
export declare function merge<T extends Arg<any, any>[]>(...args: T): RuntimeStyleFunction<InferReturnType<T>, UnboxIntersection<UnionToIntersection<BoxedTupleTypes<T>>>>;
export declare function mergeStyles(...styles: (string | null | undefined)[]): string;
export {};