/**
 * Index-based iteration over legacy DOM collections.
 *
 * `CSSStyleDeclaration`, `CSSRuleList`, `StyleSheetList`, `NamedNodeMap`, and
 * `HTMLCollection` are all `length`-plus-`item()` interfaces. Browsers have
 * retrofitted `Symbol.iterator` onto several of them; JSDOM has not, and which
 * ones are covered differs by engine and version.
 *
 * `for...of` over them therefore works in Chromium and throws in JSDOM — an
 * engine-dependent crash in the one component whose entire purpose is to behave
 * identically on both. Everything here goes through these helpers instead.
 */
interface IndexedCollection<T> {
    readonly length: number;
    item?(index: number): T | null;
    readonly [index: number]: T;
}
/**
 * Read a collection by index, preferring `item()` and falling back to bracket
 * access.
 *
 * The fallback is not defensive padding. JSDOM's CSS object model comes from
 * `cssom`, whose `CSSRuleList` is a bare array-like with a `length` and no
 * `item` method at all — so a browser-correct `item()` call throws there, while
 * bracket access works on both. Neither form alone covers both engines.
 */
export declare function items<T>(collection: IndexedCollection<T> | null | undefined): T[];
/**
 * Property names of a `CSSStyleDeclaration`.
 *
 * Separate from {@link items} because its `item()` returns property *names*
 * rather than nodes, and because a declaration block with a `length` of 0 is
 * routine rather than exceptional.
 */
export declare function propertyNames(style: CSSStyleDeclaration | null | undefined): string[];
/** Elements of an `HTMLCollection`, which has `item()` but not always an iterator. */
export declare function elements(collection: HTMLCollection | null | undefined): Element[];
/** Attributes of an element, as plain name/value pairs. */
export declare function attributesOf(element: Element): Record<string, string>;
/** Child nodes, via `childNodes.item`. */
export declare function childNodesOf(node: Node): Node[];
/** Class names, without relying on `DOMTokenList` being iterable. */
export declare function classNamesOf(element: Element): string[];
export {};
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