import { PropertyValues } from 'lit';
import { SpectrumElement } from '../../element/index.js';
declare const ButtonBase_base: typeof SpectrumElement & {
    new (...args: any[]): import('../../mixins/index.js').SlotPresenceObservingInterface;
    prototype: import('../../mixins/index.js').SlotPresenceObservingInterface;
} & {
    new (...args: any[]): import('../../mixins/index.js').SlotTextObservingInterface;
    prototype: import('../../mixins/index.js').SlotTextObservingInterface;
} & {
    new (...args: any[]): import('../../mixins/index.js').SizedElementInterface;
    prototype: import('../../mixins/index.js').SizedElementInterface;
} & import('../../mixins/index.js').SizedElementConstructor;
/**
 * Abstract base class for all button-like components. Owns shared semantic
 * concerns: interaction state, sizing, slot-derived icon/label state,
 * accessible-name resolution, and host-to-internal-button attribute forwarding.
 *
 * Visual API specific to `sp-button` (`variant`, `fill-style`, `static-color`)
 * is intentionally absent so that ActionButton, ClearButton, CloseButton,
 * PickerButton, and InfieldButton can extend this base without inheriting
 * the `swc-button` visual surface.
 *
 * @slot - Visible button label.
 * @slot icon - Optional leading icon.
 *
 * @attribute {ElementSize} size - The size of the button.
 *
 * @todo We currently have 3 levels of mixins on this class, but the mixin
 * composition guide recommends a maximum of 2. Explore reducing after milestone 2.
 */
export declare abstract class ButtonBase extends ButtonBase_base {
    static shadowRootOptions: ShadowRootInit;
    /**
     * Whether the button is disabled. Removes focusability and prevents
     * interaction.
     */
    disabled: boolean;
    /**
     * Whether the button is in a pending (busy) state. The button remains
     * focusable but activation is suppressed.
     */
    pending: boolean;
    /**
     * Accessible label forwarded to the internal `<button>` element as
     * `aria-label`. Required for icon-only buttons, which have no visible text.
     */
    accessibleLabel?: string;
    /**
     * Custom accessible label used during the pending state. When omitted,
     * the pending label is derived from the resolved non-busy accessible name
     * plus a busy suffix (e.g. "Save, busy").
     */
    pendingLabel?: string;
    /**
     * Tracks whether the pending visual (disabled colors + spinner) is currently
     * active. Set to `true` after a 1-second delay once `pending` becomes true,
     * so the button does not immediately flash to its unavailable appearance.
     * Protected so subclasses can reference it in their `classMap` binding.
     */
    protected pendingActive: boolean;
    private _pendingTimer;
    protected get hasIcon(): boolean;
    protected get hasLabel(): boolean;
    /**
     * Resolves the accessible name for the button from `accessibleLabel` or
     * visible text content. Returns `null` when no accessible name is
     * determinable.
     *
     * @internal
     */
    protected getResolvedAccessibleName(): string | null;
    /**
     * Derives the pending-state accessible label. Prefers an explicit
     * `pendingLabel`, then falls back to the resolved non-busy accessible
     * name plus a ", busy" suffix, then a fixed "Busy" fallback.
     *
     * @internal
     */
    protected getPendingAccessibleName(): string;
    /**
     * Returns the set of attributes that should be forwarded to the internal
     * semantic `<button>` element, if not otherwise directly managed.
     *
     * @internal
     */
    protected getForwardedButtonAttributes(): Record<string, string | boolean | undefined>;
    connectedCallback(): void;
    disconnectedCallback(): void;
    /**
     * Suppresses click activation while the button is `disabled` or `pending`.
     *
     * Slotted icon content lives in the light DOM, so pointer clicks on icons
     * bypass the disabled inner `<button>` and bubble on the host. The host
     * listener (capture) and inner `@click` binding both call this handler.
     */
    protected readonly handleClick: (event: Event) => void;
    protected update(changedProperties: PropertyValues): void;
}
export {};