/**
 * @license Copyright (c) 2003-2023, CKSource Holding sp. z o.o. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */
/**
 * @module list/documentlist/utils/model
 */
import type { DocumentFragment, Element, Model, Node, Writer, Item } from 'ckeditor5/src/engine';
import { type ArrayOrItem } from 'ckeditor5/src/utils';
/**
 * The list item ID generator.
 *
 * @internal
 */
export declare class ListItemUid {
    /**
     * Returns the next ID.
     *
     * @internal
     */
    static next(): string;
}
/**
 * An {@link module:engine/model/element~Element} that is known to be a list element.
 *
 * @internal
 */
export interface ListElement extends Element {
    getAttribute(key: 'listItemId'): string;
    getAttribute(key: 'listIndent'): number;
    getAttribute(key: 'listType'): 'numbered' | 'bulleted';
    getAttribute(key: string): unknown;
}
/**
 * Returns true if the given model node is a list item block.
 *
 * @internal
 */
export declare function isListItemBlock(node: Item | DocumentFragment | null): node is ListElement;
/**
 * Returns an array with all elements that represents the same list item.
 *
 * It means that values for `listIndent`, and `listItemId` for all items are equal.
 *
 * @internal
 * @param listItem Starting list item element.
 * @param options.higherIndent Whether blocks with a higher indent level than the start block should be included
 * in the result.
 */
export declare function getAllListItemBlocks(listItem: Node, options?: {
    higherIndent?: boolean;
}): Array<ListElement>;
/**
 * Returns an array with elements that represents the same list item in the specified direction.
 *
 * It means that values for `listIndent` and `listItemId` for all items are equal.
 *
 * **Note**: For backward search the provided item is not included, but for forward search it is included in the result.
 *
 * @internal
 * @param listItem Starting list item element.
 * @param options.direction Walking direction.
 * @param options.higherIndent Whether blocks with a higher indent level than the start block should be included in the result.
 */
export declare function getListItemBlocks(listItem: Node, options?: {
    direction?: 'forward' | 'backward';
    higherIndent?: boolean;
}): Array<ListElement>;
/**
 * Returns a list items nested inside the given list item.
 *
 * @internal
 */
export declare function getNestedListBlocks(listItem: Element): Array<ListElement>;
/**
 * Returns array of all blocks/items of the same list as given block (same indent, same type and properties).
 *
 * @internal
 * @param listItem Starting list item element.
 */
export declare function getListItems(listItem: Element): Array<ListElement>;
/**
 * Check if the given block is the first in the list item.
 *
 * @internal
 * @param listBlock The list block element.
 */
export declare function isFirstBlockOfListItem(listBlock: Node): boolean;
/**
 * Check if the given block is the last in the list item.
 *
 * @internal
 */
export declare function isLastBlockOfListItem(listBlock: Element): boolean;
/**
 * Expands the given list of selected blocks to include the leading and tailing blocks of partially selected list items.
 *
 * @internal
 * @param blocks The list of selected blocks.
 * @param options.withNested Whether should include nested list items.
 */
export declare function expandListBlocksToCompleteItems(blocks: ArrayOrItem<Element>, options?: {
    withNested?: boolean;
}): Array<ListElement>;
/**
 * Expands the given list of selected blocks to include all the items of the lists they're in.
 *
 * @internal
 * @param blocks The list of selected blocks.
 */
export declare function expandListBlocksToCompleteList(blocks: ArrayOrItem<Element>): Array<ListElement>;
/**
 * Splits the list item just before the provided list block.
 *
 * @internal
 * @param listBlock The list block element.
 * @param writer The model writer.
 * @returns The array of updated blocks.
 */
export declare function splitListItemBefore(listBlock: Element, writer: Writer): Array<ListElement>;
/**
 * Merges the list item with the parent list item.
 *
 * @internal
 * @param listBlock The list block element.
 * @param parentBlock The list block element to merge with.
 * @param writer The model writer.
 * @returns The array of updated blocks.
 */
export declare function mergeListItemBefore(listBlock: Node, parentBlock: Element, writer: Writer): Array<ListElement>;
/**
 * Increases indentation of given list blocks.
 *
 * @internal
 * @param blocks The block or iterable of blocks.
 * @param writer The model writer.
 * @param options.expand Whether should expand the list of blocks to include complete list items.
 * @param options.indentBy The number of levels the indentation should change (could be negative).
 */
export declare function indentBlocks(blocks: ArrayOrItem<ListElement>, writer: Writer, { expand, indentBy }?: {
    expand?: boolean;
    indentBy?: number;
}): Array<ListElement>;
/**
 * Decreases indentation of given list of blocks. If the indentation of some blocks matches the indentation
 * of surrounding blocks, they get merged together.
 *
 * @internal
 * @param blocks The block or iterable of blocks.
 * @param writer The model writer.
 */
export declare function outdentBlocksWithMerge(blocks: ArrayOrItem<ListElement>, writer: Writer): Array<ListElement>;
/**
 * Removes all list attributes from the given blocks.
 *
 * @internal
 * @param blocks The block or iterable of blocks.
 * @param writer The model writer.
 * @returns Array of altered blocks.
 */
export declare function removeListAttributes(blocks: ArrayOrItem<Element>, writer: Writer): Array<Element>;
/**
 * Checks whether the given blocks are related to a single list item.
 *
 * @internal
 * @param blocks The list block elements.
 */
export declare function isSingleListItem(blocks: Array<Node>): boolean;
/**
 * Modifies the indents of list blocks following the given list block so the indentation is valid after
 * the given block is no longer a list item.
 *
 * @internal
 * @param lastBlock The last list block that has become a non-list element.
 * @param writer The model writer.
 * @returns Array of altered blocks.
 */
export declare function outdentFollowingItems(lastBlock: Element, writer: Writer): Array<ListElement>;
/**
 * Returns the array of given blocks sorted by model indexes (document order).
 *
 * @internal
 */
export declare function sortBlocks<T extends Element>(blocks: Iterable<T>): Array<T>;
/**
 * Returns a selected block object. If a selected object is inline or when there is no selected
 * object, `null` is returned.
 *
 * @internal
 * @param model The instance of editor model.
 * @returns Selected block object or `null`.
 */
export declare function getSelectedBlockObject(model: Model): Element | null;