Javascript - genreate uuid v4

 https://stackoverflow.com/questions/105034/how-to-create-a-guid-uuid?page=1&tab=votes#tab-top

https://github.com/Microsoft/TypeScript/issues/18402

  function uuidv4()
  {
     return ([1e7] as any + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c =>
      (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16)
    )
  }