import type { PertInput, PertResult } from './types.js';
/**
 * Calculate PERT (Program Evaluation and Review Technique) analysis
 *
 * Formulas:
 * - Expected duration (te) = (O + 4M + P) / 6
 * - Variance = ((P - O) / 6)²
 * - Project variance = sum of critical path variances
 * - Z-score = (deadline - project duration) / √(project variance)
 *
 * @param input - PERT input with tasks and optional deadline
 * @returns PERT analysis result
 * @throws RangeError if tasks is empty or contains a circular dependency
 */
export declare function pert(input: PertInput): PertResult;
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