import type { NeoListBaseProps } from '../index.js';
import type { Snippet } from 'svelte';
import type { HTMLTransitionProps } from '../utils/action.utils.js';
import type { HTMLNeoBaseElement, HTMLRefProps, HTMLTagProps } from '../utils/html-element.utils.js';
export interface NeoVirtualItem<T> {
    id: string | number;
    index: number;
    item: T;
}
export interface NeoVirtualContext<T> {
    items: Array<T>;
    visible: Array<NeoVirtualItem<T>>;
    start: number;
    end: number;
}
export type NeoVirtualKey<T> = (item: T) => string | number | undefined;
export declare const defaultVirtualKey: NeoVirtualKey<unknown>;
export interface NeoVirtualListProps<T, Tag extends keyof HTMLElementTagNameMap = 'ul'> extends Omit<HTMLNeoBaseElement<HTMLElementTagNameMap[Tag]>, 'children'>, HTMLRefProps, HTMLTransitionProps, NeoListBaseProps {
    /**
     * Snippet to render each item in the list.
     */
    children: Snippet<[NeoVirtualItem<T>, NeoVirtualContext<T>]>;
    /**
     * Snippet to render before all items in the list.
     */
    before?: Snippet<[NeoVirtualContext<T>]>;
    /**
     * Snippet to render after all items in the list.
     */
    after?: Snippet<[NeoVirtualContext<T>]>;
    /**
     * The tag name of the element to render the list as.
     *
     * @default 'ul'
     */
    tag?: Tag | keyof HTMLElementTagNameMap;
    /**
     * The items to render in the list.
     */
    items: Array<T>;
    /**
     * The number of items to keep rendered before and after the visible items.
     *
     * @default 3
     */
    buffer?: number;
    /**
     * The average height of each item in the list.
     */
    itemHeight?: number;
    /**
     * A function to extract a unique key from each item in the list.
     *
     * @default (item) => item?.id
     */
    key?: NeoVirtualKey<T>;
    /**
     * Optional properties to pass to the content element wrapping item rows.
     */
    contentProps?: HTMLNeoBaseElement & HTMLTagProps;
    /**
     * Optional properties to pass to the tag element wrapping the before snippet.
     */
    beforeProps?: HTMLNeoBaseElement & HTMLTagProps;
    /**
     * Optional properties to pass to the element wrapping the after snippet.
     */
    afterProps?: HTMLNeoBaseElement & HTMLTagProps;
}