import { PropertyValues } from 'lit';
import { SpectrumElement } from '../../element/index.js';
import { AccordionDensity, AccordionHeadingLevel, AccordionSize } from './Accordion.types.js';
declare const AccordionBase_base: typeof SpectrumElement & {
    new (...args: any[]): import('../../mixins/index.js').SizedElementInterface;
    prototype: import('../../mixins/index.js').SizedElementInterface;
} & import('../../mixins/index.js').SizedElementConstructor;
/**
 * Base class for accordion components. Manages item propagation, heading
 * level, density, and the exclusive-open constraint.
 *
 * @attribute {boolean} allowMultiple - Reflected as `allow-multiple`. When set,
 *   multiple items may be open at the same time.
 * @attribute {number} level - Heading level (2–6) applied to every item header.
 *   Values outside that range are clamped.
 * @attribute {AccordionSize} size - Size applied to all items.
 * @attribute {AccordionDensity} density - Vertical spacing between items.
 * @attribute {boolean} quiet - Renders the accordion in its quiet visual variant.
 * @attribute {boolean} disabled - Disables all items in the accordion.
 *
 * @slot - One or more `swc-accordion-item` elements.
 */
export declare abstract class AccordionBase extends AccordionBase_base {
    /**
     * When set, multiple items may be open at the same time. By default only
     * one item can be open.
     */
    allowMultiple: boolean;
    /**
     * Heading level applied to every item header (2–6). Defaults to 3.
     * Values outside that range are clamped.
     */
    level: AccordionHeadingLevel;
    /**
     * Size applied to all items. Defaults to `m`.
     */
    size: AccordionSize;
    /**
     * Controls vertical spacing between items.
     *
     * @default regular
     */
    density: AccordionDensity;
    /**
     * Renders the accordion in its quiet (no-border) visual variant.
     */
    quiet: boolean;
    /**
     * Disables all items in the accordion. Individual items may also be
     * disabled independently.
     */
    disabled: boolean;
    private assignedItems;
    private readonly selectionController;
    protected firstUpdated(changedProperties: PropertyValues): void;
    protected syncAccordionItems(): void;
    protected update(changedProperties: PropertyValues): void;
}
export {};