import type { Visit } from './anamnesis-types';
/** Column id of the synthetic merged first visit. A record must not hold a
 * real visit with this id. */
export declare const BASELINE_VISIT_ID = "baseline";
export interface VisitBaseline {
    /** The synthetic merged first visit; `null` when the record holds fewer
     * than two first visits. */
    baseline: Visit | null;
    /** The first visits folded into it, oldest first. Empty when `baseline`
     * is null. */
    sources: Visit[];
    /** The list every downstream read runs on: `[baseline, ...non-first visits
     * in record order]` — or the INPUT ARRAY ITSELF when nothing merged. */
    visits: Visit[];
    /** What the picker may toggle: `visits` minus the baseline (the input
     * array itself when nothing merged). */
    pickable: Visit[];
}
export interface ResolveBaselineOptions {
    /** A visit that stays its own column even when it is a first visit —
     * compile mode's editable newest visit. Omitted = every first visit folds. */
    keepId?: string;
}
/** One sort key for every source, on the event axis's rule: with any
 * date-only stamp among them all compare by UTC-anchored calendar DAY, else
 * by instant — so the merge order never depends on the viewer's time zone.
 * Unreadable dates sort last; `Array.sort` is stable, so ties keep record
 * order. */
export declare function visitSortKey(visits: readonly Visit[]): (iso: string) => number;
export declare function isBaselineVisit(visit: Visit): boolean;
/** Resolve the effective visit list. Never mutates `visits` or any visit in
 * it; the synthetic visit is built field by field so nothing of a source's
 * identity (id, source label, practitioner) leaks into it. */
export declare function resolveBaseline(visits: readonly Visit[], { keepId }?: ResolveBaselineOptions): VisitBaseline;
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