import type { FlatPatternInput, FlatPatternResult } from './types.js';
/**
 * Calculate flat pattern length for bent sheet metal.
 *
 * For L-shape: Flat Length = flangeA + flangeB - Bend Deduction
 * For U-shape: Flat Length = flangeA + flangeB + flangeC - 2 x Bend Deduction
 *
 * @param input - Flat pattern input parameters
 * @returns FlatPatternResult with flat length, BA, BD, and K-factor
 */
export declare function flatPattern(input: FlatPatternInput): FlatPatternResult;
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