import type { ButtonAppearance, ButtonShape, ButtonSize, ButtonType, ButtonVariant } from './mud-button.types';
/**
 * Button — interactive control.
 *
 * Pattern B (atom-interactive): renders its own `<button>` (or `<a>` when `href`
 * is set) inside shadow DOM. Form participation works via `formAssociated` +
 * `ElementInternals`.
 *
 * @element mud-button
 *
 * @slot - (default) The label content. Plain text or rich inline content.
 * @slot icon-start - Optional `mud-icon` rendered before the label.
 * @slot icon-end - Optional `mud-icon` rendered after the label.
 * @slot icon - When filled, switches the button into icon-only mode: the
 *               container becomes square with equal zero-padding, and any
 *               `icon-start`, `icon-end`, or default-slot label content
 *               is suppressed. Requires `label` (or `aria-label`) for AT.
 */
export declare class MudButton {
    /**
     * Color treatment.
     * @default 'primary'
     */
    variant: ButtonVariant;
    /**
     * Visual treatment.
     * - `filled` (default) — solid background per variant
     * - `outlined` — 1.5px border with transparent fill in default/focus; hover/active fill solid (matches filled)
     * - `text` — no border, transparent fill, hover/active tint background; designed for inline use
     *
     * `outlined` and `text` only support `primary`, `strict`, and `destructive` variants.
     * Other variants fall back to `primary` visuals with a dev-time console warning.
     *
     * @default 'filled'
     */
    appearance: ButtonAppearance;
    /**
     * Visual size rung.
     * @default 'md'
     */
    size: ButtonSize;
    /**
     * Container silhouette. `circular` produces a fully-rounded pill;
     * combine with an icon-only label to render a circle.
     * @default 'rectangular'
     */
    shape: ButtonShape;
    /**
     * Native button `type` attribute. Ignored when `href` is set.
     * @default 'button'
     */
    type: ButtonType;
    /**
     * Disables interactivity. When set the internal control receives
     * `aria-disabled` and (for `<button>`) the native `disabled` attribute.
     * @default false
     */
    disabled: boolean;
    /**
     * Renders a centred spinner and blocks interactivity while preserving the
     * accessible name. Sets `aria-busy` on the internal control.
     * @default false
     */
    loading: boolean;
    /**
     * Switches the button into icon-only mode: the container becomes square
     * with equal zero-padding, and `icon-start`/`icon-end`/default-slot
     * content is suppressed. Icon content should be placed in `slot="icon"`.
     * Requires `label` (or `aria-label`) for screen readers.
     * @default false
     */
    iconOnly: boolean;
    /**
     * Makes the button expand to fill the inline-size of its container.
     * The host becomes a block-level flex container and the internal control
     * stretches to 100% width — designed for use inside `mud-button-group`
     * (vertical orientation) or in narrow form layouts.
     * @default false
     */
    fullWidth: boolean;
    /**
     * If set, the button renders as `<a href="…">` and behaves as a link.
     * `type`, `name`, and `value` are ignored in this mode.
     */
    href?: string;
    /**
     * `target` for the anchor when `href` is set.
     */
    target?: string;
    /**
     * `rel` for the anchor when `href` is set.
     */
    rel?: string;
    /**
     * Form-control `name`. Used when `type="submit"` and a value is submitted.
     */
    name?: string;
    /**
     * Form-control `value` submitted alongside `name`.
     */
    value?: string;
    /**
     * Accessible name. Required when the button has no visible text label
     * (icon-only). Forwarded to `aria-label` on the internal control.
     */
    label?: string;
    private hasIconStart;
    private hasIconEnd;
    private hasIcon;
    private fieldsetDisabled;
    host: HTMLMudButtonElement;
    internals: ElementInternals;
    componentDidLoad(): void;
    /**
     * Called by the browser when an ancestor `<fieldset disabled>` toggles. Mirrors
     * the disabled state into `fieldsetDisabled` so the control becomes inert
     * without clobbering the consumer-set `disabled` prop.
     */
    formDisabledCallback(disabled: boolean): void;
    /**
     * Called when the containing form is reset. The button itself holds no
     * persistent submission value, so this only clears any submitter value left
     * over from a prior click (defensive — `handleClick` already nulls it).
     */
    formResetCallback(): void;
    private onIconStartSlotChange;
    private onIconEndSlotChange;
    private onIconSlotChange;
    private slotHasContent;
    private hasAccessibleName;
    private isInert;
    private handleClick;
    private spinnerSizeFor;
    private spinnerVariantFor;
    render(): any;
}