import type { Triangle, TriangleKind } from "@actuarial-ts/core";
/**
 * Long-format ("tidy") triangle assembly: one row per observed
 * (origin, age) cell, pivoted into the origins x ages grid the engine uses.
 *
 * - Origins are sorted lexicographically (matching triangle label order,
 *   e.g. "2019" < "2020", "2021Q1" < "2021Q3").
 * - Ages are sorted numerically ascending.
 * - Pairs absent from the input are null (not yet observable / missing).
 * - Duplicate (origin, age) pairs are ambiguous and throw
 *   ReservingError("SHAPE", ...), even when the values agree.
 */
export interface LongFormatRow {
    origin: string;
    /** Development age in months. */
    age: number;
    value: number | null;
}
export interface TriangleFromLongFormatOptions {
    kind: TriangleKind;
}
/** Pivots long-format rows into a Triangle via core's triangleFromGrid. */
export declare function triangleFromLongFormat(rows: LongFormatRow[], opts: TriangleFromLongFormatOptions): Triangle;
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