import Hashes from "jshashes";const sha1 = new Hashes.SHA1().setUTF8(true);const getStringByteLength = function(str) {    var totalLength = 0;         var charCode;      for (var i = 0; i < str.length; i++) {          charCode = str.charCodeAt(i);          if (charCode < 0x007f)  {                 totalLength++;             } else if ((0x0080 <= charCode) && (charCode <= 0x07ff))  {                 totalLength += 2;             } else if ((0x0800 <= charCode) && (charCode <= 0xffff))  {                 totalLength += 3;           } else{              totalLength += 4;           }              }      return totalLength;   }const gitsha = function(content) {    var header = "blob " + getStringByteLength(content) + "\0";    var text = header + content;    return sha1.hex(text);}