import type { CSSResult } from 'lit';
export type Theme = 'material' | 'bootstrap' | 'indigo' | 'fluent';
export type ThemeVariant = 'light' | 'dark';
export type Themes = {
    light: {
        [K in Theme]?: CSSResult;
    };
    dark: {
        [K in Theme]?: CSSResult;
    };
};
export type ThemeChangedCallback = (theme: Theme) => unknown;
/**
 * A controller responsible for adopting various component themes;
 * See also {@link updateWhenThemeChanges}.
 */
export interface ThemeController {
    /**
     * The name of the currently adopted theme. See {@link Theme}.
     */
    theme: Theme;
    /**
     * Optional callback function to invoke when the theme is changed at runtime.
     */
    onThemeChanged?: ThemeChangedCallback;
}