export type AnthropicCitation = {
    type: "char_location" | "page_location" | "content_block_location" | "web_search_result_location" | "search_result_location";
    citedText: string;
    url?: string;
    title?: string;
    encryptedIndex?: string;
    source?: string;
    fileId?: string;
    startCharIndex?: number;
    endCharIndex?: number;
    startBlockIndex?: number;
    endBlockIndex?: number;
    startPageNumber?: number;
    endPageNumber?: number;
    documentIndex?: number;
    documentTitle?: string;
    searchResultIndex?: number;
};
/**
 * Validates and normalizes the current Messages API citation union.
 *
 * Citation records are provider-controlled protocol data. Returning
 * `undefined` for any malformed or unknown variant lets callers fail the
 * successful response closed instead of silently discarding attribution.
 */
export declare function normalizeAnthropicCitation(raw: unknown): AnthropicCitation | undefined;
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