/**
 * Shared helpers for element wrappers.
 */
export type ElementList = Element[];
/**
 * Normalize a CSS property name for the CSSOM `setProperty()` /
 * `getPropertyValue()` calls, which only understand the hyphenated form.
 *
 * `css({ fontSize: '18px' })` — the jQuery spelling, and the one the
 * migration guide shows — was otherwise ignored without any error. Custom
 * properties (`--brand`) are case-sensitive and passed through untouched;
 * vendor prefixes follow the DOM spelling (`WebkitTransition`,
 * `webkitTransition`, `msTransform` → `-webkit-transition`, `-ms-transform`).
 * Names that already contain a hyphen are passed through unchanged.
 * @internal
 */
export declare const toCssPropertyName: (name: string) => string;
/**
 * Whether an element is hidden by one of the mechanisms `show()` undoes:
 * an inline `display: none`, or the `hidden` attribute when no inline
 * `display` overrides it (an inline `display: flex` beats `[hidden]`).
 * `hidden="until-found"` hides through `content-visibility`, so it hides the
 * content whatever the inline `display` is.
 * @internal
 */
export declare const isElementHidden: (el: Element) => boolean;
/**
 * Hide an element with an inline `display: none`, remembering the inline
 * `display` it had so {@link showElement} can put it back.
 * @internal
 */
export declare const hideElement: (el: Element) => void;
/**
 * Show an element: drop the `hidden` attribute and restore the inline
 * `display` from before {@link hideElement}. An explicit `display` wins.
 * Without one, an element that is not inline-hidden keeps its current value.
 * @internal
 */
export declare const showElement: (el: Element, display?: string) => void;
/** Handler signature for delegated events */
export type DelegatedHandler = (event: Event, target: Element) => void;
/** @internal */
export declare const addDelegatedListener: (el: Element, event: string, selector: string, handler: DelegatedHandler) => void;
/** @internal */
export declare const removeDelegatedListener: (el: Element, event: string, selector: string, handler: DelegatedHandler) => void;
export declare const toElementList: (input: Element | ElementList) => ElementList;
export declare const applyAll: (elements: ElementList, action: (el: Element) => void) => void;
/** @internal */
export declare const isHTMLElement: (element: Element | null | undefined) => element is HTMLElement;
/**
 * Gets an element's inner size (content + padding, excluding border and margin).
 *
 * @internal
 */
export declare const getInnerSize: (element: Element | null | undefined, dimension: "width" | "height") => number;
/**
 * Gets an element's outer size, optionally including margins.
 *
 * @internal
 */
export declare const getOuterSize: (element: Element | null | undefined, dimension: "width" | "height", includeMargin: boolean) => number;
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