import type { MetalWeightInput, MetalWeightResult } from './types.js';
/**
 * Calculate metal weight based on shape, material, dimensions, and length.
 *
 * @formula Weight = Volume × Density
 *   - plate: Volume = width × thickness × length
 *   - round: Volume = π(d/2)² × length
 *   - pipe:  Volume = π(R² − r²) × length
 *   - angle: Volume = (w×t + h×t − t²) × length
 *   - All dimensions in mm → Volume converted mm³ → cm³ (÷1000) → kg (×density/1000)
 *
 * @reference Oberg, E. et al. "Machinery's Handbook", 31st Ed. Industrial Press.
 *
 * @units dimensions: mm, density: g/cm³, weight: kg
 *
 * @param input - Metal weight input parameters (discriminated by shape)
 * @returns MetalWeightResult with weight (kg), volume (cm³), and density (g/cm³)
 */
export declare function metalWeight(input: MetalWeightInput): MetalWeightResult;
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