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finmath-engine

v0.4.1

Published

Motor de cálculos financeiros de alta precisão para o mercado brasileiro

Downloads

188

Readme

@finmath/engine

Motor de cálculos financeiros de alta precisão para o mercado brasileiro.

Version License TypeScript

🎯 Características

  • Precisão decimal (decimal.js - sem erros de ponto flutuante)
  • 30 Golden Files validando cálculos
  • TypeScript nativo com types completos
  • CET completo (IOF + seguros + perfis institucionais)
  • Método de Brent para IRR robusto
  • 85% de cobertura de testes

📦 Instalação

npm install @finmath/engine decimal.js
# ou
pnpm add @finmath/engine decimal.js
# ou
yarn add @finmath/engine decimal.js

🚀 Uso Rápido

import { Decimal } from 'decimal.js';
import { amortization, cet, irr } from '@finmath/engine';

// Price
const price = amortization.calculatePrice({
  pv: new Decimal('10000'),
  rate: new Decimal('0.02'),
  n: 12
});
console.log(`PMT: R$ ${price.pmt.toFixed(2)}`); // R$ 946.56

// CET
const cetResult = cetBasic({
  pv: new Decimal('10000'),
  pmt: new Decimal('946.56'),
  n: 12,
  feesT0: [{ name: 'TAC', value: new Decimal('150') }]
});
console.log(`CET Anual: ${cetResult.cetAnual.mul(100).toFixed(2)}%`);

// IRR
const cashflows = [
  new Decimal('-10000'),
  new Decimal('1000'),
  ...
];
const tir = irr.calculateIRR(cashflows);
console.log(`TIR: ${tir.mul(100).toFixed(2)}%`);

📚 Módulos Disponíveis

Amortização

  • calculatePrice() - Sistema Price
  • generatePriceSchedule() - Cronograma Price
  • calculateSAC() - Sistema SAC
  • generateSacSchedule() - Cronograma SAC

CET (Custo Efetivo Total)

  • cetBasic() - CET básico (tarifas t0)
  • calculateCETFull() - CET completo (IOF + seguros)

IRR/NPV

  • calculateIRR() - Taxa Interna de Retorno (Brent)
  • calculateNPV() - Valor Presente Líquido

Outros

  • interest - Juros compostos (FV/PV)
  • rate - Equivalência de taxas
  • series - Séries uniformes
  • daycount - Convenções de contagem de dias

📖 Documentação

🧪 Exemplos

Ver diretório examples/ para exemplos detalhados:

  • 01-price-basico.ts - Cálculo Price completo
  • 02-cet-completo.ts - CET com tarifas
  • 03-irr-investimento.ts - TIR de projeto

🔬 Testes

# Todos os testes
pnpm test

# Apenas Golden Files
pnpm test:golden

# Cobertura
pnpm test:coverage

📊 Qualidade

  • ✅ 30/30 Golden Files validados
  • ✅ 85% cobertura de código
  • ✅ 0 erros TypeScript
  • ✅ Lint limpo

🤝 Contribuindo

Contribuições são bem-vindas! Veja CONTRIBUTING.md.

📄 Licença

MIT © 2025 PrinceOfEgypt1

🔗 Links