/**
 * Citation-graph densification (#1505): two TS-native tools that close gaps in
 * a research corpus's citation graph.
 *
 *  - extract-crossrefs — scan analysis docs' Cross-References / Related-Work /
 *    Referenced-By sections for REF ids that have a sidecar but are missing from
 *    the source's Outgoing table, and (with --write) inject them as outgoing
 *    edges. Port of section9 `extract_crossrefs.py`. This is new capability —
 *    no existing skill covers cross-reference → outgoing densification.
 *  - citation-backfill — compute the inverse of the outgoing map and report /
 *    inject missing Incoming edges + dangling cited-but-no-sidecar targets.
 *    TS-native parity for `citation_backfill.py`; the prose `citation-backfill`
 *    skill orchestrates this deterministic tool.
 *
 * Both default to dry-run; pass `{ write: true }` to persist.
 *
 * @source historical: corpus/extract_crossrefs.py, corpus/citation_backfill.py
 * @tests @test/unit/artifacts/citation-densify.test.ts
 */
export interface CrossrefResult {
    scanned: number;
    /** source ref → target refs to add as outgoing edges */
    perSource: Record<string, string[]>;
    totalAdditions: number;
    applied: number;
}
export declare function extractCrossrefs(root: string, opts?: {
    refs?: string[];
    write?: boolean;
}): CrossrefResult;
export declare function renderCrossrefs(r: CrossrefResult, write: boolean): string;
export interface BackfillResult {
    scanned: number;
    totalOutgoing: number;
    totalIncomingCurrent: number;
    totalIncomingExpected: number;
    missingEdges: number;
    /** target ref → source refs missing from its incoming table */
    perTarget: Record<string, string[]>;
    /** cited but no sidecar: target ref → citing sources */
    dangling: Array<{
        target: string;
        sources: string[];
    }>;
    applied: number;
}
export declare function backfillCitations(root: string, opts?: {
    write?: boolean;
}): BackfillResult;
export declare function renderBackfill(r: BackfillResult, write: boolean): string;
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