private isValidUsd (usd: string | number) {
   check(is.not.null(usd), 'USD is not set')
   check(is.not.empty(usd), 'USD is not set')
   check(is.number(Number(usd)), 'USD is not a valid number')
   check(is.above(Number(usd), -1), 'USD must be a positive number')
   return true
 }

 private isValidDeposit (deposit: string | number) {
   check(is.not.null(deposit), 'Deposit is not set')
   check(is.not.empty(deposit), 'Deposit is not set')
   check(is.number(Number(deposit)), 'Deposit is not a valid number')
   check(is.above(Number(deposit), -1), 'Deposit must be a positive number')
   return true
 }

 private isValidCharge  (charge: string | number) {
   check(is.not.null(charge), 'Charge is not set')
   check(is.not.empty(charge), 'Charge is not set')
   check(is.number(Number(charge)), `Charge is not a valid number: ${charge}`)
   check(is.above(Number(charge), -1), 'Charge must be a positive number')
   return true
 }

  /**
  * Validates that the input string is a valid date formatted as "mm/dd/yyyy"
  * @param  {String}  dateString String with date to check.
  * @return {Boolean}            checked date
  * Extrated from
  * @url http://stackoverflow.com/questions/6177975/how-to-validate-date-with-format-mm-dd-yyyy-in-javascript
  */
  private isValidDate (dateString) {
    check(is.not.null(dateString), 'Date is not set')
    check(is.not.empty(dateString), 'Date is not set')
    // First check for the pattern
    if (!/^\d{1,2}\/\d{1,2}\/\d{4}$/.test(dateString)) {
      throw new Error('Invalid date string')
    }

    // Parse the date parts to integers
    const parts = dateString.split('/')
    const day = parseInt(parts[0], 10)
    const month = parseInt(parts[1], 10)
    const year = parseInt(parts[2], 10)

    // Check the ranges of month and year
    if (year < 1000 || year > 3000 || month === 0 || month > 12) {
      throw new Error('Invalid date string')
    }

    const monthLength = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]

    // Adjust for leap years
    if (year % 400 === 0 || (year % 100 !== 0 && year % 4 === 0)) {
      monthLength[1] = 29
    }

    // Check the range of the day
    return day > 0 && day <= monthLength[month - 1]
  }

  private isValidKind (kind: string) {
    const noType = lodash.includes(TRANSACTION_TYPES, kind)
    check(is.not.null(kind), 'Kind is not set')
    check(is.not.empty(kind), 'Kind is not set')
    if (!noType) {
      throw new Error('Invalid transaction kind.')
    }

    if (typeof kind === 'undefined') {
      throw new Error('Kind cannot be undefined')
    }
  }

 private isValidDescription (description: string): boolean {
   check(is.not.null(description), 'Description can\'t be empty')
   check(is.not.empty(description), 'Description can\'t be empty')
   check(is.string(description), 'Description must be a string')
   return true
 };

 private isValidBalance (balance: number | string) {
   check(is.not.null(balance), 'Balance is not set')
   check(is.not.empty(balance), 'Balance is not set')
   check(is.number(Number(balance)), 'Balance is not a valid number')
   return true
 }