import { LitElement } from 'lit';
import { AbstractConstructor } from './constructor.ts';
declare global {
    interface ARIAMixin {
        ariaActiveDescendantElement: Element | null;
        ariaControlsElements: readonly Element[] | null;
        ariaDescribedByElements: readonly Element[] | null;
        ariaDetailsElements: readonly Element[] | null;
        ariaErrorMessageElements: readonly Element[] | null;
        ariaLabelledByElements: readonly Element[] | null;
        ariaOwnsElements: readonly Element[] | null;
    }
}
export interface SbbStateController {
    add(value: string): this;
    delete(value: string): boolean;
    has(value: string): boolean;
    toggle(value: string, force?: boolean): void;
}
/**
 * Creates a state controller for the given element.
 * NOT INTENDED TO BE USED BY CONSUMERS!
 * @internal
 */
export declare function ɵstateController(element: Element): SbbStateController;
export declare function ɵstateController(element: Element | undefined | null): SbbStateController | null;
export interface SbbElementInternalsConstructor {
    role?: ElementInternals['role'];
}
export declare abstract class SbbElementInternalsMixinType {
    protected readonly internals: ElementInternals;
    protected toggleState(value: string, force?: boolean): void;
}
/**
 * Appends the given elements to the given aria value and returns the
 * combined value as a new array or null, if both values were empty.
 */
export declare const appendAriaElements: (ariaValue: readonly Element[] | null, ...newElements: (Element | null)[]) => Element[] | null;
/**
 * Removes the given elements from the given aria value and returns
 * the remaining elements as a new array or null, if the result is empty.
 */
export declare const removeAriaElements: (ariaValue: readonly Element[] | null, ...removableElements: (Element | null)[]) => Element[] | null;
/**
 * The SbbElementInternalsMixin attaches ElementInternals to the element and sets
 * the role, if defined.
 */
export declare const SbbElementInternalsMixin: <T extends AbstractConstructor<LitElement>>(superClass: T) => AbstractConstructor<SbbElementInternalsMixinType> & T & SbbElementInternalsConstructor;
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