import ' rollup-plugin-inject-process-env';
import { FC } from "react";
import { FormWidgetTheme } from "@xapp/stentor-form-widget-channel";
export interface WidgetStylesheetProps {
    readonly theme?: FormWidgetTheme;
}
/**
 * Injects the styles
 *
 * @param props
 * @returns
 */
export declare const WidgetStylesheet: FC<WidgetStylesheetProps>;
/**
 * Loads an external font by injecting a link tag into the document head
 * Automatically adds font-display=swap optimization for Google Fonts
 */
export declare function loadExternalFont(fontUrl: string): void;
/**
 * Collects the defined theme CSS variables as [name, value] entries, skipping
 * empty values.
 */
export declare function buildStyleVariables(theme?: FormWidgetTheme): Array<[string, string]>;
export declare function buildStyleContent(widgetTheme?: FormWidgetTheme): string;