/** Open Graph / content type for og:type. */
export type OGType = "website" | "article" | "profile" | "video.other" | "product" | "music.song" | "book";
/** Config for the useLLMMetadata hook. All fields optional except route. */
export interface LLMConfig {
    /** Current route path (e.g. "/blog/ai-hooks"). Changes trigger metadata update. */
    route: string;
    /** "manual" = use title/description/tags from config. "auto-extract" = derive from DOM. */
    mode?: "manual" | "auto-extract";
    /** Page title (manual mode). */
    title?: string;
    /** Page description (manual mode). */
    description?: string;
    /** Tags/keywords (manual mode). */
    tags?: string[];
    /** Canonical URL (absolute). */
    canonicalUrl?: string;
    /** Content language (e.g. "en", "en-US"). */
    language?: string;
    /** Open Graph type (website, article, etc.). */
    ogType?: OGType;
    /** OG image URL (absolute). */
    ogImage?: string;
    /** OG image alt text. */
    ogImageAlt?: string;
    /** Site name (e.g. for social previews). */
    siteName?: string;
    /** Author name (for articles). */
    author?: string;
    /** ISO date string (article publish). */
    publishedTime?: string;
    /** ISO date string (article last modified). */
    modifiedTime?: string;
    /** Robots hint (e.g. "index, follow"). */
    robots?: string;
    /** Extra key-value pairs (e.g. section, category). Keys/values are sanitized. */
    extra?: Record<string, string | number | boolean | string[]>;
}
/** Payload injected as JSON in the LLM script tag. Only includes defined, safe values. */
export interface LLMPayload {
    route: string;
    title?: string;
    description?: string;
    tags?: string[];
    outline?: string[];
    canonicalUrl?: string;
    language?: string;
    ogType?: string;
    ogImage?: string;
    ogImageAlt?: string;
    siteName?: string;
    author?: string;
    publishedTime?: string;
    modifiedTime?: string;
    robots?: string;
    generatedAt: string;
    extra?: Record<string, string | number | boolean | string[]>;
}
/**
 * Production-ready hook: injects an AI-readable metadata block into the document head
 * when the route changes. Framework-agnostic (React 18+ and Preact 10+ via aliasing).
 *
 * - Rich structure: route, title, description, tags, outline (auto), canonicalUrl, language,
 *   ogType, ogImage, ogImageAlt, siteName, author, publishedTime, modifiedTime, robots, extra.
 * - Safe usage: never throws; invalid/missing config is normalized; DOM and JSON are guarded.
 * - Cacheable: if the generated payload is unchanged, the script is not replaced.
 * - SSR-safe: no-op when window/document is undefined.
 * - Cleans up on unmount (removes the script).
 *
 * @param config - Route (required), mode, and optional metadata fields. Can be partial; defaults applied.
 */
export declare function useLLMMetadata(config: LLMConfig | null | undefined): void;