export const hashString = str => {
  if (!str) {
    return 0
  }
  let hash = 0
  for (let i = 0; i < str.length; i++) {
    let char = str.charCodeAt(i)
    hash = (hash << 5) - hash + char
    hash = hash & hash // Convert to 32bit integer
  }
  return hash
}