Node.js module to generate invoice number sequentially
$ npm install invoice-number
import { InvoiceNumber } from 'invoice-number'
InvoiceNumber.next('2017/08/ABC001')
// => 2017/08/ABC002
InvoiceNumber.next('xjsiwe234njshd6')
// => XJSIWE234NJSHD7
InvoiceNumber.next('899ZZZ9')
// => 900AAA0