/**
 * Normalize a surface name for SURFACE-FORM dedup only (case, whitespace,
 * punctuation, diacritics). This does NOT solve semantic identity — "Tom Lane"
 * vs "tgl" is resolved by the harvester via searchGraphNodes + mergeGraphNodes,
 * which records an alias. Keep this conservative so we never collapse distinct
 * people.
 */
export declare function normalizeName(raw: string): string;
/** Canonical dedup key: `<normalized-kind>:<normalized-name>`. */
export declare function nodeKeyOf(kind: string, name: string): string;
/** Merge alias lists, de-duplicated by surface form, preserving first-seen order. */
export declare function mergeAliases(existing: string[], incoming: string[]): string[];
/**
 * Normalize a free-text predicate into a grouping key. The original predicate
 * is kept verbatim on the edge; this is only for matching/analytics so the open
 * vocabulary stays queryable without being frozen.
 */
export declare function predicateKey(predicate: string): string;
/**
 * Combine an existing edge confidence with a new independent observation.
 * Monotonic, saturating, order-independent:  c' = 1 - (1-c_old)(1-c_obs).
 */
export declare function reinforceConfidence(existing: number, observation: number): number;
export declare function clamp01(x: number): number;
export interface ExistingEdge {
    confidence: number;
    observations: number;
    evidence: string[];
}
export interface EdgeUpsertDecision {
    /** create: no edge existed. reinforce: bump observations + noisy-OR.
     * noop: re-assert carried only already-known evidence — idempotent. */
    action: "create" | "reinforce" | "noop";
    confidence: number;
    observations: number;
    evidence: string[];
}
/**
 * Evidence is OPTIONAL (the graph stays permissive). Reinforcement counts only
 * NOVEL observations: an assertion reinforces iff it carries ≥1 evidence
 * scopeKey not already on the edge, or carries no evidence at all. Re-asserting
 * with only already-known evidence is an idempotent no-op — a duplicate/replayed
 * harvest of the same fact cannot inflate observations or confidence.
 */
export declare function decideEdgeUpsert(input: {
    confidence?: number;
    evidence?: string[];
}, existing: ExistingEdge | null): EdgeUpsertDecision;
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