import { DomUtils } from '../htmlparser2';
import { Node } from '../domhandler';
import type { Cheerio } from './cheerio';
/**
 * Check if the DOM element is a tag.
 *
 * `isTag(type)` includes `<script>` and `<style>` tags.
 *
 * @private
 * @category Utils
 * @param type - DOM node to check.
 * @returns Whether the node is a tag.
 */
export declare const isTag: typeof DomUtils.isTag;
/**
 * Checks if an object is a Cheerio instance.
 *
 * @category Utils
 * @param maybeCheerio - The object to check.
 * @returns Whether the object is a Cheerio instance.
 */
export declare function isCheerio<T>(maybeCheerio: any): maybeCheerio is Cheerio<T>;
/**
 * Convert a string to camel case notation.
 *
 * @private
 * @category Utils
 * @param str - String to be converted.
 * @returns String in camel case notation.
 */
export declare function camelCase(str: string): string;
/**
 * Convert a string from camel case to "CSS case", where word boundaries are
 * described by hyphens ("-") and all characters are lower-case.
 *
 * @private
 * @category Utils
 * @param str - String to be converted.
 * @returns String in "CSS case".
 */
export declare function cssCase(str: string): string;
/**
 * Iterate over each DOM element without creating intermediary Cheerio instances.
 *
 * This is indented for use internally to avoid otherwise unnecessary memory
 * pressure introduced by _make.
 *
 * @category Utils
 * @param array - Array to iterate over.
 * @param fn - Function to call.
 * @returns The original instance.
 */
export declare function domEach<T extends Node, Arr extends ArrayLike<T> = Cheerio<T>>(array: Arr, fn: (elem: T, index: number) => void): Arr;
/**
 * Create a deep copy of the given DOM structure. Sets the parents of the copies
 * of the passed nodes to `null`.
 *
 * @private
 * @category Utils
 * @param dom - The htmlparser2-compliant DOM structure.
 * @returns - The cloned DOM.
 */
export declare function cloneDom<T extends Node>(dom: T | T[]): T[];
/**
 * Check if string is HTML.
 *
 * @private
 * @category Utils
 * @param str - String to check.
 * @returns Indicates if `str` is HTML.
 */
export declare function isHtml(str: string): boolean;
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