/**
 * The references of a document (#268): CSL items written in its front
 * matter (`references:`, as Pandoc reads them) and in `:::references`
 * blocks (BibTeX, CSL-JSON or CSL-YAML), and the works it lists without
 * citing them (`nocite`).
 */
import type { ContentBlock } from '../parse/index.js';
import type { CslItem } from './types.js';
/** Something wrong with the reference data, where it is written. */
export interface ReferenceIssue {
    message: string;
    sourceStart: number;
    sourceEnd: number;
}
/** The references and `nocite` keys of a document. */
export interface ReferenceData {
    items: CslItem[];
    /** Keys listed without a citation; `'*'` lists every reference. */
    nocite: string[];
    issues: ReferenceIssue[];
}
/** A reference as YAML or JSON wrote it, as a CSL item; undefined without
 *  an id. Types default to `book`; dates and names are normalised; numbers
 *  become strings. */
export declare function normalizeCslItem(raw: unknown): CslItem | undefined;
/** The `nocite` field of a front matter: `'@*'`, `'@a, @b'`, `['@a']`. */
export declare function nociteKeys(value: unknown): string[];
/** The items of a `:::references` block, in its `format` (`bibtex`,
 *  `csl-json`, `csl-yaml`; guessed from the body when unset). */
export declare function referencesOfBlock(block: ContentBlock, issues: ReferenceIssue[]): CslItem[];
/** The references of a document: its front matter's `references` and
 *  `nocite`, and every `:::references` block, in order. A key written twice
 *  keeps its first entry. */
export declare function documentReferences(metadata: Record<string, unknown> | undefined, blocks: readonly ContentBlock[]): ReferenceData;
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