const {bill,bradesco} = require('boleto-br')
const bradescoBill = bill(bradesco)
const {generateBillData} = bradescoBill

const boletos =  [
  {
    ...
    expirationDay: Date,
    value: number,
    agency: string,
    card: string,
    ourNumber: string,
    account: number
  }
]
generateBillData(boletos).then( data => {
  // do something with data
}).catch(err => {
  console.log(err)
})

const {bill,bradesco} = require('boleto-br')
const bradescoBill = bill(bradesco)
const {generateRemittanceFile} = bradescoBill

const boletos = {
  emitterCompanyCode: '433923',
  agencyNumber: '7506',
  agencyDigit: 1,
  accountNumber: 54291,
  accountDigity: 1,
  emitterCompany: 'ACME. SA',
  card: '09',
  date: new Date(2017, 6, 10),
  seedingSequentialNumber: 1,
  bills: [
    {
      ourNumber: '1',
      documentNumber: '1',
      value: 10000,
      lateFee: true,
      lateFeePercentual: 2,
      lateFeeValuePerDay: 17,
      occurencyCode: '01',
      expirationDay: new Date(2017, 6, 10),
      debtType: '12',
      issueDay: new Date(2017, 6, 10),
      discountDayLimit: 0,
      discountValue: 0,
      iofValue: 0,
      decreaseValue: 0,
      discountPerDay: 0,
      registerType: '01',
      instructionOne: '00',
      instructionTwo: '00',
      registerNumber: '83901298000138',
      payerName: 'JOHN BUYER',
      payerAddress: 'CLOWN SC',
      messageOne: '',
      payerPostalCode: '88703500',
      messageTwo: '083901298000138 ACME SA'
    }
  ]
}

generateRemittanceFile(boletos).then(data =>{
  fs.writeFile("./REMESSATEST.REM", data , function(err) {
    if(err) {
      return console.log(err)
    }
    console.log("The file was saved!")
  })
}).catch(err =>{
  console.log(err)
})