import { default as React, ReactNode } from 'react';
import { BaseColor, BorderColor, ElementDensity, ElementElevation, ElementFocusEffect, ElementFont, ElementHoverEffect, ElementOutline, ElementPlacement, ElementPressedEffect, ElementSelectedEffect, ElementShape, ElementSize, ElementTouchEffect, SemanticColor } from '../../utils';
/**
 * Props for the ButtonBase component.
 *
 * @category Base components
 */
export interface ButtonBaseProps extends Omit<React.ButtonHTMLAttributes<HTMLButtonElement>, 'color' | 'size'> {
    /** Outline thickness when outlined. Default: 1 */
    border?: ElementOutline;
    /** Border color when outlined. */
    borderColor?: BorderColor;
    /** Custom content. Overrides label, icons, and layout. */
    children?: ReactNode;
    /** Semantic color theme. Default: primary */
    color?: SemanticColor;
    /** Initial selected state for uncontrolled toggle buttons. */
    defaultSelected?: boolean;
    /** Visual density of the button. */
    density?: ElementDensity;
    /** Disables the button. */
    disabled?: boolean;
    /** Required root class name. */
    elementClass: string;
    /** Enables elevated style. */
    elevated?: boolean;
    /** Explicit elevation level. */
    elevation?: ElementElevation;
    /** Icon rendered at the end of the button. */
    endIcon?: React.ReactElement;
    /** Enables filled style. */
    filled?: boolean;
    /** Disables elevation and elevation effects. */
    flat?: boolean;
    /** Focus visual effects. */
    focusEffects?: ElementFocusEffect[];
    /** Font token for label and content. */
    font?: ElementFont;
    /** Expands button to full width. */
    fullWidth?: boolean;
    /** Hover visual effects. */
    hoverEffects?: ElementHoverEffect[];
    /** Icon rendered at the start of the button. */
    icon?: React.ReactElement;
    /** DOM id. Auto-generated if not provided. */
    id?: string;
    /** Text label for the button. */
    label?: string;
    /** Custom leading content. */
    leading?: ReactNode;
    /** Imperative link trigger element. */
    link?: React.ReactElement;
    /** Shows loading spinner and disables interaction. */
    loading?: boolean;
    /** DOM name attribute. */
    name?: string;
    /** Blur event handler. */
    onBlur?: React.FocusEventHandler<HTMLButtonElement>;
    /** Change event handler (toggle buttons). */
    onChange?: React.ChangeEventHandler<HTMLButtonElement>;
    /** Click event handler. */
    onClick?: React.MouseEventHandler<HTMLButtonElement>;
    /** Change handler for file upload input. */
    onUploadChange?: React.ChangeEventHandler<HTMLInputElement>;
    /** Enables outlined style. */
    outlined?: boolean;
    /** Pressed visual effects. */
    pressedEffects?: ElementPressedEffect[];
    /** Controlled selected state for toggle buttons. */
    selected?: boolean;
    /** Semantic color override when selected. */
    selectedColor?: SemanticColor;
    /** Visual effects applied when selected. */
    selectedEffects?: ElementSelectedEffect[];
    /** Icon displayed when selected. */
    selectedIcon?: React.ReactElement;
    /** Shape override when selected. */
    selectedShape?: ElementShape;
    /** Text color override when selected. */
    selectedTextColor?: BaseColor;
    /** Shape of the button. */
    shape?: ElementShape;
    /** Predefined button size. Default: medium */
    size?: ElementSize;
    /** Text color override. */
    textColor?: BaseColor;
    /** Tooltip text and accessibility label fallback. */
    title?: string;
    /** Enables toggle button behavior. */
    toggle?: boolean;
    /** Enables tonal style. */
    tonal?: boolean;
    /** Tooltip alignment relative to the button. */
    tooltipAlign?: ElementPlacement;
    /** Touch and click visual effects. */
    touchEffects?: ElementTouchEffect[];
    /** Custom trailing content. */
    trailing?: ReactNode;
    /** Native button type. Default: button */
    type?: 'submit' | 'reset' | 'button';
    /** Enables file upload trigger behavior. */
    upload?: boolean;
    /** Accepted MIME types for file upload. */
    uploadAccept?: string;
    /** Enables multi-file upload. */
    uploadMultiple?: boolean;
}
/**
 * Low-level base component for all button variants.
 *
 * Supports Material Design 3 styles, toggle behavior, loading state,
 * file upload trigger, icons, and semantic colors.
 *
 * @param props - Component properties.
 * @function
 *
 * @example
 * <ButtonBase label="Save" filled icon={<SaveIcon />} />
 *
 * @example
 * <ButtonBase upload label="Upload" onUploadChange={handleUpload} />
 *
 * @category Base components
 */
export declare const ButtonBase: React.ForwardRefExoticComponent<ButtonBaseProps & React.RefAttributes<HTMLButtonElement>>;