import type { SiteShellAttributes, SiteShellPosition } from "./types.js";
export declare function asOptionalText(value: string | null | undefined): string | null;
export declare function asOptionalHttpUrl(value: string | null | undefined): string | null;
export declare function normalizeSiteShellPosition(value: string | null | undefined): SiteShellPosition;
export declare function escapeHtml(value: string): string;
export declare function readSiteShellAttributes(element: Pick<Element, "getAttribute">): SiteShellAttributes;
export declare function resolveMountTarget(target: Element | string): Element;
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