import type { PropertyPathItem, ViewModel } from './core';
import { VM_RAW } from './core';
export declare const VM_WATCHER_PATH: unique symbol;
export declare const VM_WATCHER_VALUE: unique symbol;
export declare const VM_WATCHER_IS_DEEP: unique symbol;
export declare const VM_WATCHER_LISTENER: unique symbol;
export declare const VM_WATCHER_IMM: unique symbol;
export type WatchHandler<T = any> = (newValue: T, oldValue: T | undefined, propertyPath?: PropertyPathItem[]) => void;
export interface Watcher<T = any> {
    [VM_RAW]?: ViewModel;
    [VM_WATCHER_PATH]?: PropertyPathItem[];
    [VM_WATCHER_VALUE]?: T;
    [VM_WATCHER_LISTENER]?: WatchHandler<T>;
    [VM_WATCHER_IS_DEEP]: boolean;
    [VM_WATCHER_IMM]: {
        i: number;
        /**
         * 发生变更的路径，undefined 代表初始无变更，null 代表直接深度 watch 对象无变更 path。
         */
        p?: PropertyPathItem[] | null;
    };
}
export declare function destoryWatcher(watcher: Watcher): void;
export declare function getValueByPath(target: unknown, path?: PropertyPathItem[]): any;
/**
 * watch view-model by property path.
 * TODO: watchPath 能实现深度的基于 keyof 的类型严格的 Property Path 么？
 */
export declare function watchPath(vm: ViewModel, handler: WatchHandler, propertyPath?: PropertyPathItem[], deep?: boolean, immediate?: boolean): () => void;
export declare function innerWatchPath(vm: ViewModel, val: unknown, handler: WatchHandler, path?: PropertyPathItem[], deep?: boolean): () => void;
export type UnwatchFn = () => void;
export interface WatchOptions {
    /** 是否立即执行监听回调函数，默认 false。 */
    immediate?: boolean;
    /** 是否深度监听该值，默认 false。 */
    deep?: boolean;
}
/** 监听 vm 对象的 property 属性的变更。 */
export declare function vmWatch<T extends object, P extends keyof T>(vm: T, property: P, handler: WatchHandler<T[P]>, options?: WatchOptions): UnwatchFn;
/** 深度监听 vm 对象的任何变更 */
export declare function vmWatch<T extends object>(vm: T, handler: WatchHandler<T>, options?: {
    immediate?: boolean;
}): UnwatchFn;
/** 监听 vm 对象上的 property path 属性，即多层的子对象的属性。 */
export declare function vmWatch<T extends object>(vm: T, propertyPath: PropertyPathItem[], handler: WatchHandler<any>, options?: WatchOptions): UnwatchFn;
export declare function notifyVmPropChange(vm: ViewModel, prop: PropertyPathItem): void;
export declare function notifyVmArrayChange(vm: ViewModel): void;