import type { FC } from '../jsx';
import { type AnyFn } from '../util';
import type { ComponentHost } from './component';
export declare const REF: unique symbol;
export interface Ref<T extends Node | Record<string, AnyFn>> {
    value?: T;
}
export type RefValue<T extends Ref<any> | undefined> = T extends Ref<infer R> ? R : never;
export declare function ref<T extends Node | FC>(): T extends Node ? Ref<T> : T extends FC ? Ref<RefValue<Parameters<T>[0]['ref']>> : never;
export declare function isRef<T extends Node | Record<string, AnyFn>>(v: object): v is Ref<T>;
export type RefFn<T = Node> = (el: T) => void;
/** 用于给编译器使用的 set ref 函数 */
export declare function setRefForComponent(target: ComponentHost, ref: Ref<any> | RefFn<any>, el: ComponentHost | Node): void;