/**
 * Static, Page-owned document metadata.
 *
 * `meta` keys map to HTML `<meta name="...">` names. Rich head content such
 * as `property`, `charset`, links, and scripts is intentionally outside this
 * core contract.
 */
export interface PageMetadata {
    readonly title?: string;
    readonly meta?: Readonly<Record<string, string>>;
}
export declare function assertPageMetadata(value: unknown, source: string): asserts value is PageMetadata;
export declare function clonePageMetadata(value: PageMetadata | undefined): PageMetadata | undefined;
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