Pinafore-Web-Client-Frontend/routes/_database/utils.js

import padStart from 'lodash/padStart'

export function toPaddedBigInt (id) {
  return padStart(id, 30, '0')
}

export function toReversePaddedBigInt (id) {
  let bigInt = toPaddedBigInt(id)
  let res = ''
  for (let i = 0; i < bigInt.length; i++) {
    res += (9 - parseInt(bigInt.charAt(i), 10)).toString(10)
  }
  return res
}