import type { FC } from '../jsx';
import type { PropertyPathItem, WatchHandler, WatchOptions } from '../vm';
import { type ComponentHost } from './component';
import type { RefValue } from './ref';
export declare function setCurrentComponentHost(component: ComponentHost | undefined): void;
export declare function getCurrentComponentHost(): ComponentHost;
/** 监听 vm 对象的 property 属性的变更。 */
export declare function watch<T extends object, P extends keyof T>(vm: T, property: P, handler: WatchHandler<T[P]>, options?: WatchOptions): void;
/** 深度监听 vm 对象的任何变更 */
export declare function watch<T extends object>(vm: T, handler: WatchHandler<T>, options?: {
    /** 是否立即执行监听回调函数，默认 false。 */
    immediate?: boolean;
}): void;
/** 监听 vm 对象上的 property path 属性，即多层的子对象的属性。 */
export declare function watch<T extends object>(vm: T, propertyPath: PropertyPathItem[], handler: WatchHandler<any>, options?: WatchOptions): void;
export declare function onMount(fn: () => (() => void) | void): void;
export declare function onUnmount(fn: () => void): void;
export declare function context<T>(key: string | symbol, value: T): void;
export declare function context<T>(key: string | symbol): T;
export declare function expose<T extends FC>(instance: RefValue<Parameters<T>[0]['ref']>): void;
export declare function firstDOM(): Node;
export declare function lastDOM(): Node;