import type { WaterFootprintInput, WaterFootprintResult } from './types.js';
/**
 * Calculate water footprint (blue, green, grey)
 *
 * @formula total = blue + green + grey
 * @reference Water Footprint Network, ISO 14046
 * @param input - Blue, green, grey water volumes
 * @returns Total water footprint with percentage breakdown. An all-zero footprint is
 *   valid-but-degenerate: percentages are reported as 0.
 * @throws {RangeError} any water volume < 0
 */
export declare function waterFootprint(input: WaterFootprintInput): WaterFootprintResult;
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