import { LitElement } from 'lit';
import './contrastStyles.css';
import '../transitionStyles.css';
export declare class A11yContrastButton extends LitElement {
    label: string;
    addContrastLabel: string;
    removeContrastLabel: string;
    addContrastAriaLabel: string;
    removeContrastAriaLabel: string;
    static properties: {
        label: {
            type: StringConstructor;
            attribute: boolean;
        };
        ariaLabel: {
            type: StringConstructor;
            attribute: boolean;
        };
        addContrastLabel: {
            type: StringConstructor;
            attribute: string;
        };
        addContrastAriaLabel: {
            type: StringConstructor;
            attribute: string;
        };
        removeContrastLabel: {
            type: StringConstructor;
            attribute: string;
        };
        removeContrastAriaLabel: {
            type: StringConstructor;
            attribute: string;
        };
    };
    updateLabel(featEnabled?: boolean): void;
    __handleClick(): void;
    connectedCallback(): void;
    createRenderRoot(): this;
    render(): import("lit").TemplateResult<1>;
}