import type { Scope3EmissionsInput, Scope3EmissionsResult } from './types.js';
/**
 * Calculate Scope 3 (value chain) CO2 emissions using spend-based EEIO method
 *
 * @formula CO2eq = spend × EEIO factor
 * @reference GHG Protocol Scope 3 Standard, EPA EEIO model
 * @param input - Scope 3 category and spend amount
 * @returns CO2eq emissions in kg and tonnes
 */
export declare function scope3Emissions(input: Scope3EmissionsInput): Scope3EmissionsResult;
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