import type { WeightSource } from "./types.js";
export interface ParsedServingWeight {
    weight_g: number;
    weight_source: Exclude<WeightSource, "column">;
}
/**
 * True when `name` names a food dense/light enough that Tier C's 1.0 g/mL assumption would be
 * meaningfully wrong (see DENSITY_SENSITIVE_RE above). Used to suppress Tier C derivation for
 * these foods — they fall back to the honest `per_100g` basis instead of a confidently wrong
 * per-serving number.
 */
export declare function isDensitySensitiveFood(name: string | null | undefined): boolean;
/**
 * Derives a serving weight in grams from a free-text `serving_size` string, when the
 * `serving_weight_g` column is NULL. Returns null (never a guess) for anything that isn't
 * confidently parseable — e.g. "1 bottle", "1 can". See docs/CALLER-GUIDE.md for how callers
 * should weight `weight_source` on the result.
 */
export declare function parseServingWeight(servingSize: string | null | undefined): ParsedServingWeight | null;