card.js

'use strict'

const luhn = require('fast-luhn')
const Types = require('./types')

module.exports = Card

function Card (data) {
  const types = Types(data)

  return {
    types: data,
    parse: parseCard,
    format: formatCard,
    type: cardType,
    luhn: luhn,
    isValid: isCardValid
  }

  function parseCard (number) {
    if (typeof number !== 'string') return ''
    return number.replace(/[^\d]/g, '')
  }

  function formatCard (number, separator) {
    const type = getType(number, true)
    if (!type) return number
    return type.group(number).join(separator || ' ')
  }

  function cardType (number, eager) {
    const type = getType(number, eager)
    return type ? type.name : undefined
  }

  function isCardValid (number, type) {
    if (type) {
      type = types.get(type)
    } else {
      type = getType(number)
    }
    if (!type) return false
    return (!type.luhn || luhn(number)) && type.test(number)
  }

  function getType (number, eager) {
    return types.find(function (type) {
      return type.test(number, eager)
    })
  }
}