/**
 * The root node of an application.
 */
export type RootNode = Document | ShadowRoot;
/**
 * Class of the <div> that contains the entire application.
 */
export declare const APP_ROOT_CLASS = "pioneer-root";
export declare function isShadowRoot(node: RootNode): node is ShadowRoot;
export declare function isDocument(node: RootNode): node is Document;
/**
 * Returns the parent node for <style> elements.
 */
export declare function getStylesRoot(node: RootNode): ShadowRoot | HTMLHeadElement;
/**
 * Creates the node that contains all other application content.
 */
export declare function createAppRoot(locale: string): HTMLDivElement;
/**
 * Returns the styles for host element (the web component node).
 */
export declare function getBuiltinStyles(rootNode: RootNode, hostElement: HTMLElement | undefined): string;