import type { ComponentHost } from '../../core';
export type Key<T> = string | number | symbol | T;
export type KeyMap<T> = Map<Key<T>, number>;
export type KeyFn<T> = (value: T, index: number) => Key<T>;
export declare const KEY_DATA: unique symbol;
export declare const KEY_INDEX: unique symbol;
export interface EachVm<T> {
    data: T;
    index: number;
    key?: Key<T>;
}
export type ForEach<T> = ComponentHost & {
    [KEY_DATA]: EachVm<T>;
};