import type { VaAnalysisInput, VaAnalysisResult } from './types.js';
/**
 * Value-Added / Non-Value-Added Analysis
 *
 * Categorizes process activities as VA (Value Added), NVA (Non-Value Added),
 * or NNVA (Necessary Non-Value Added) and computes time ratios.
 *
 * @reference Womack, J.P. & Jones, D.T. (1996). "Lean Thinking".
 * @reference Ohno, T. (1988). "Toyota Production System".
 *
 * @throws {RangeError} Activities array must have at least 1 element
 * @throws {RangeError} All activity durations must be non-negative
 */
export declare function vaAnalysis(input: VaAnalysisInput): VaAnalysisResult;
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