export default PseudoBackdrop;
export type ToggleState = "open" | "closed";
export type CSSInfinity = "calc(infinity)";
export type AnimatesAttr = Extract<FillMode, "forwards" | "backwards" | "both" | "none">;
declare class PseudoBackdrop extends HTMLElement {
    /**
     * @type {WeakMap<Document | ShadowRoot, number>} Tracks the Root Nodes to which the {@link PseudoBackdrop} has attached
     * its `toggle` event listener. Each root points to the number of {@link PseudoBackdrop} instances registered with it.
     */
    static #registeredRoots: WeakMap<Document | ShadowRoot, number>;
    /**
     * @param {ToggleEvent} event
     * @returns {void}
     */
    static #handleDelegatedToggle(event: ToggleEvent): void;
    /**
     * The Event Handler used by the {@link PseudoBackdrop}'s `transitionrun` event when it is **_opened_**.
     * @param {TransitionEvent} event
     * @returns {void}
     */
    static #handleTransitionrun(event: TransitionEvent): void;
    /**
     * Promotes the `pseudoPopover` (and the related `elevatedSibling`) associated with the provided {@link backdrop}
     * to a higher Stacking Context by applying a high `z-index` to the elements.
     * @param {PseudoBackdrop} backdrop
     * @returns {void}
     */
    static #promote(backdrop: PseudoBackdrop): void;
    /**
     * The Event Handler used by the {@link PseudoBackdrop}'s `transitionend` and `transitioncancel` events when it is **_closed_**.
     * @param {TransitionEvent} event
     * @returns {void}
     */
    static #handleTransitionCompletion(event: TransitionEvent): void;
    /**
     * Demotes the `pseudoPopover` (and the related `elevatedSibling`) associated with the provided {@link backdrop}
     * by terminating their Stacking Contexts (via `z-index` removal).
     * @param {PseudoBackdrop} backdrop
     * @returns {void}
     */
    static #demote(backdrop: PseudoBackdrop): void;
    /** "On Mount" for Custom Elements @returns {void} */
    connectedCallback(): void;
    /** "On Unmount" for Custom Elements @returns {void} */
    disconnectedCallback(): void;
    /** @param {AnimatesAttr | null | undefined} value */
    set animates(value: AnimatesAttr | null | undefined);
    /**
     * Tells the {@link PseudoBackdrop} how it should **_expect_** to be animated. This setting is required
     * to ensure that the backdrop will always modify the `z-index`es of other elements at the right time.
     *
     * - `both` (default): The backdrop should expect to be animated in both directions.
     * - `forwards`: The backdrop should only expect to be animated while opening.
     * - `backwards`: The backdrop should only expect to be animated while closing.
     * - `none`: The backdrop should never expect to be animated.
     * @returns {AnimatesAttr}
     */
    get animates(): AnimatesAttr;
    #private;
}
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