(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.tus = f()}})(function(){var define,module,exports;return (function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = void 0;
var _isReactNative = _interopRequireDefault(require("./isReactNative.js"));
var _uriToBlob = _interopRequireDefault(require("./uriToBlob.js"));
var _FileSource = _interopRequireDefault(require("./sources/FileSource.js"));
var _StreamSource = _interopRequireDefault(require("./sources/StreamSource.js"));
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
function _regeneratorRuntime() { "use strict"; /*! regenerator-runtime -- Copyright (c) 2014-present, Facebook, Inc. -- license (MIT): https://github.com/facebook/regenerator/blob/main/LICENSE */ _regeneratorRuntime = function _regeneratorRuntime() { return e; }; var t, e = {}, r = Object.prototype, n = r.hasOwnProperty, o = Object.defineProperty || function (t, e, r) { t[e] = r.value; }, i = "function" == typeof Symbol ? Symbol : {}, a = i.iterator || "@@iterator", c = i.asyncIterator || "@@asyncIterator", u = i.toStringTag || "@@toStringTag"; function define(t, e, r) { return Object.defineProperty(t, e, { value: r, enumerable: !0, configurable: !0, writable: !0 }), t[e]; } try { define({}, ""); } catch (t) { define = function define(t, e, r) { return t[e] = r; }; } function wrap(t, e, r, n) { var i = e && e.prototype instanceof Generator ? e : Generator, a = Object.create(i.prototype), c = new Context(n || []); return o(a, "_invoke", { value: makeInvokeMethod(t, r, c) }), a; } function tryCatch(t, e, r) { try { return { type: "normal", arg: t.call(e, r) }; } catch (t) { return { type: "throw", arg: t }; } } e.wrap = wrap; var h = "suspendedStart", l = "suspendedYield", f = "executing", s = "completed", y = {}; function Generator() {} function GeneratorFunction() {} function GeneratorFunctionPrototype() {} var p = {}; define(p, a, function () { return this; }); var d = Object.getPrototypeOf, v = d && d(d(values([]))); v && v !== r && n.call(v, a) && (p = v); var g = GeneratorFunctionPrototype.prototype = Generator.prototype = Object.create(p); function defineIteratorMethods(t) { ["next", "throw", "return"].forEach(function (e) { define(t, e, function (t) { return this._invoke(e, t); }); }); } function AsyncIterator(t, e) { function invoke(r, o, i, a) { var c = tryCatch(t[r], t, o); if ("throw" !== c.type) { var u = c.arg, h = u.value; return h && "object" == _typeof(h) && n.call(h, "__await") ? e.resolve(h.__await).then(function (t) { invoke("next", t, i, a); }, function (t) { invoke("throw", t, i, a); }) : e.resolve(h).then(function (t) { u.value = t, i(u); }, function (t) { return invoke("throw", t, i, a); }); } a(c.arg); } var r; o(this, "_invoke", { value: function value(t, n) { function callInvokeWithMethodAndArg() { return new e(function (e, r) { invoke(t, n, e, r); }); } return r = r ? r.then(callInvokeWithMethodAndArg, callInvokeWithMethodAndArg) : callInvokeWithMethodAndArg(); } }); } function makeInvokeMethod(e, r, n) { var o = h; return function (i, a) { if (o === f) throw Error("Generator is already running"); if (o === s) { if ("throw" === i) throw a; return { value: t, done: !0 }; } for (n.method = i, n.arg = a;;) { var c = n.delegate; if (c) { var u = maybeInvokeDelegate(c, n); if (u) { if (u === y) continue; return u; } } if ("next" === n.method) n.sent = n._sent = n.arg;else if ("throw" === n.method) { if (o === h) throw o = s, n.arg; n.dispatchException(n.arg); } else "return" === n.method && n.abrupt("return", n.arg); o = f; var p = tryCatch(e, r, n); if ("normal" === p.type) { if (o = n.done ? s : l, p.arg === y) continue; return { value: p.arg, done: n.done }; } "throw" === p.type && (o = s, n.method = "throw", n.arg = p.arg); } }; } function maybeInvokeDelegate(e, r) { var n = r.method, o = e.iterator[n]; if (o === t) return r.delegate = null, "throw" === n && e.iterator["return"] && (r.method = "return", r.arg = t, maybeInvokeDelegate(e, r), "throw" === r.method) || "return" !== n && (r.method = "throw", r.arg = new TypeError("The iterator does not provide a '" + n + "' method")), y; var i = tryCatch(o, e.iterator, r.arg); if ("throw" === i.type) return r.method = "throw", r.arg = i.arg, r.delegate = null, y; var a = i.arg; return a ? a.done ? (r[e.resultName] = a.value, r.next = e.nextLoc, "return" !== r.method && (r.method = "next", r.arg = t), r.delegate = null, y) : a : (r.method = "throw", r.arg = new TypeError("iterator result is not an object"), r.delegate = null, y); } function pushTryEntry(t) { var e = { tryLoc: t[0] }; 1 in t && (e.catchLoc = t[1]), 2 in t && (e.finallyLoc = t[2], e.afterLoc = t[3]), this.tryEntries.push(e); } function resetTryEntry(t) { var e = t.completion || {}; e.type = "normal", delete e.arg, t.completion = e; } function Context(t) { this.tryEntries = [{ tryLoc: "root" }], t.forEach(pushTryEntry, this), this.reset(!0); } function values(e) { if (e || "" === e) { var r = e[a]; if (r) return r.call(e); if ("function" == typeof e.next) return e; if (!isNaN(e.length)) { var o = -1, i = function next() { for (; ++o < e.length;) if (n.call(e, o)) return next.value = e[o], next.done = !1, next; return next.value = t, next.done = !0, next; }; return i.next = i; } } throw new TypeError(_typeof(e) + " is not iterable"); } return GeneratorFunction.prototype = GeneratorFunctionPrototype, o(g, "constructor", { value: GeneratorFunctionPrototype, configurable: !0 }), o(GeneratorFunctionPrototype, "constructor", { value: GeneratorFunction, configurable: !0 }), GeneratorFunction.displayName = define(GeneratorFunctionPrototype, u, "GeneratorFunction"), e.isGeneratorFunction = function (t) { var e = "function" == typeof t && t.constructor; return !!e && (e === GeneratorFunction || "GeneratorFunction" === (e.displayName || e.name)); }, e.mark = function (t) { return Object.setPrototypeOf ? Object.setPrototypeOf(t, GeneratorFunctionPrototype) : (t.__proto__ = GeneratorFunctionPrototype, define(t, u, "GeneratorFunction")), t.prototype = Object.create(g), t; }, e.awrap = function (t) { return { __await: t }; }, defineIteratorMethods(AsyncIterator.prototype), define(AsyncIterator.prototype, c, function () { return this; }), e.AsyncIterator = AsyncIterator, e.async = function (t, r, n, o, i) { void 0 === i && (i = Promise); var a = new AsyncIterator(wrap(t, r, n, o), i); return e.isGeneratorFunction(r) ? a : a.next().then(function (t) { return t.done ? t.value : a.next(); }); }, defineIteratorMethods(g), define(g, u, "Generator"), define(g, a, function () { return this; }), define(g, "toString", function () { return "[object Generator]"; }), e.keys = function (t) { var e = Object(t), r = []; for (var n in e) r.push(n); return r.reverse(), function next() { for (; r.length;) { var t = r.pop(); if (t in e) return next.value = t, next.done = !1, next; } return next.done = !0, next; }; }, e.values = values, Context.prototype = { constructor: Context, reset: function reset(e) { if (this.prev = 0, this.next = 0, this.sent = this._sent = t, this.done = !1, this.delegate = null, this.method = "next", this.arg = t, this.tryEntries.forEach(resetTryEntry), !e) for (var r in this) "t" === r.charAt(0) && n.call(this, r) && !isNaN(+r.slice(1)) && (this[r] = t); }, stop: function stop() { this.done = !0; var t = this.tryEntries[0].completion; if ("throw" === t.type) throw t.arg; return this.rval; }, dispatchException: function dispatchException(e) { if (this.done) throw e; var r = this; function handle(n, o) { return a.type = "throw", a.arg = e, r.next = n, o && (r.method = "next", r.arg = t), !!o; } for (var o = this.tryEntries.length - 1; o >= 0; --o) { var i = this.tryEntries[o], a = i.completion; if ("root" === i.tryLoc) return handle("end"); if (i.tryLoc <= this.prev) { var c = n.call(i, "catchLoc"), u = n.call(i, "finallyLoc"); if (c && u) { if (this.prev < i.catchLoc) return handle(i.catchLoc, !0); if (this.prev < i.finallyLoc) return handle(i.finallyLoc); } else if (c) { if (this.prev < i.catchLoc) return handle(i.catchLoc, !0); } else { if (!u) throw Error("try statement without catch or finally"); if (this.prev < i.finallyLoc) return handle(i.finallyLoc); } } } }, abrupt: function abrupt(t, e) { for (var r = this.tryEntries.length - 1; r >= 0; --r) { var o = this.tryEntries[r]; if (o.tryLoc <= this.prev && n.call(o, "finallyLoc") && this.prev < o.finallyLoc) { var i = o; break; } } i && ("break" === t || "continue" === t) && i.tryLoc <= e && e <= i.finallyLoc && (i = null); var a = i ? i.completion : {}; return a.type = t, a.arg = e, i ? (this.method = "next", this.next = i.finallyLoc, y) : this.complete(a); }, complete: function complete(t, e) { if ("throw" === t.type) throw t.arg; return "break" === t.type || "continue" === t.type ? this.next = t.arg : "return" === t.type ? (this.rval = this.arg = t.arg, this.method = "return", this.next = "end") : "normal" === t.type && e && (this.next = e), y; }, finish: function finish(t) { for (var e = this.tryEntries.length - 1; e >= 0; --e) { var r = this.tryEntries[e]; if (r.finallyLoc === t) return this.complete(r.completion, r.afterLoc), resetTryEntry(r), y; } }, "catch": function _catch(t) { for (var e = this.tryEntries.length - 1; e >= 0; --e) { var r = this.tryEntries[e]; if (r.tryLoc === t) { var n = r.completion; if ("throw" === n.type) { var o = n.arg; resetTryEntry(r); } return o; } } throw Error("illegal catch attempt"); }, delegateYield: function delegateYield(e, r, n) { return this.delegate = { iterator: values(e), resultName: r, nextLoc: n }, "next" === this.method && (this.arg = t), y; } }, e; }
function asyncGeneratorStep(gen, resolve, reject, _next, _throw, key, arg) { try { var info = gen[key](arg); var value = info.value; } catch (error) { reject(error); return; } if (info.done) { resolve(value); } else { Promise.resolve(value).then(_next, _throw); } }
function _asyncToGenerator(fn) { return function () { var self = this, args = arguments; return new Promise(function (resolve, reject) { var gen = fn.apply(self, args); function _next(value) { asyncGeneratorStep(gen, resolve, reject, _next, _throw, "next", value); } function _throw(err) { asyncGeneratorStep(gen, resolve, reject, _next, _throw, "throw", err); } _next(undefined); }); }; }
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor); } }
function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == _typeof(i) ? i : i + ""; }
function _toPrimitive(t, r) { if ("object" != _typeof(t) || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != _typeof(i)) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
var FileReader = exports["default"] = /*#__PURE__*/function () {
  function FileReader() {
    _classCallCheck(this, FileReader);
  }
  return _createClass(FileReader, [{
    key: "openFile",
    value: function () {
      var _openFile = _asyncToGenerator( /*#__PURE__*/_regeneratorRuntime().mark(function _callee(input, chunkSize) {
        var blob;
        return _regeneratorRuntime().wrap(function _callee$(_context) {
          while (1) switch (_context.prev = _context.next) {
            case 0:
              if (!((0, _isReactNative["default"])() && input && typeof input.uri !== 'undefined')) {
                _context.next = 11;
                break;
              }
              _context.prev = 1;
              _context.next = 4;
              return (0, _uriToBlob["default"])(input.uri);
            case 4:
              blob = _context.sent;
              return _context.abrupt("return", new _FileSource["default"](blob));
            case 8:
              _context.prev = 8;
              _context.t0 = _context["catch"](1);
              throw new Error("tus: cannot fetch `file.uri` as Blob, make sure the uri is correct and accessible. ".concat(_context.t0));
            case 11:
              if (!(typeof input.slice === 'function' && typeof input.size !== 'undefined')) {
                _context.next = 13;
                break;
              }
              return _context.abrupt("return", Promise.resolve(new _FileSource["default"](input)));
            case 13:
              if (!(typeof input.read === 'function')) {
                _context.next = 18;
                break;
              }
              chunkSize = Number(chunkSize);
              if (Number.isFinite(chunkSize)) {
                _context.next = 17;
                break;
              }
              return _context.abrupt("return", Promise.reject(new Error('cannot create source for stream without a finite value for the `chunkSize` option')));
            case 17:
              return _context.abrupt("return", Promise.resolve(new _StreamSource["default"](input, chunkSize)));
            case 18:
              return _context.abrupt("return", Promise.reject(new Error('source object may only be an instance of File, Blob, or Reader in this environment')));
            case 19:
            case "end":
              return _context.stop();
          }
        }, _callee, null, [[1, 8]]);
      }));
      function openFile(_x, _x2) {
        return _openFile.apply(this, arguments);
      }
      return openFile;
    }()
  }]);
}();

},{"./isReactNative.js":5,"./sources/FileSource.js":6,"./sources/StreamSource.js":7,"./uriToBlob.js":10}],2:[function(require,module,exports){
"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = fingerprint;
var _isReactNative = _interopRequireDefault(require("./isReactNative.js"));
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
// TODO: Differenciate between input types

/**
 * Generate a fingerprint for a file which will be used the store the endpoint
 *
 * @param {File} file
 * @param {Object} options
 * @param {Function} callback
 */
function fingerprint(file, options) {
  if ((0, _isReactNative["default"])()) {
    return Promise.resolve(reactNativeFingerprint(file, options));
  }
  return Promise.resolve(['tus-br', file.name, file.type, file.size, file.lastModified, options.endpoint].join('-'));
}
function reactNativeFingerprint(file, options) {
  var exifHash = file.exif ? hashCode(JSON.stringify(file.exif)) : 'noexif';
  return ['tus-rn', file.name || 'noname', file.size || 'nosize', exifHash, options.endpoint].join('/');
}
function hashCode(str) {
  // from https://stackoverflow.com/a/8831937/151666
  var hash = 0;
  if (str.length === 0) {
    return hash;
  }
  for (var i = 0; i < str.length; i++) {
    var _char = str.charCodeAt(i);
    hash = (hash << 5) - hash + _char;
    hash &= hash; // Convert to 32bit integer
  }
  return hash;
}

},{"./isReactNative.js":5}],3:[function(require,module,exports){
"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = void 0;
function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor); } }
function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == _typeof(i) ? i : i + ""; }
function _toPrimitive(t, r) { if ("object" != _typeof(t) || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != _typeof(i)) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
var XHRHttpStack = exports["default"] = /*#__PURE__*/function () {
  function XHRHttpStack() {
    _classCallCheck(this, XHRHttpStack);
  }
  return _createClass(XHRHttpStack, [{
    key: "createRequest",
    value: function createRequest(method, url) {
      return new Request(method, url);
    }
  }, {
    key: "getName",
    value: function getName() {
      return 'XHRHttpStack';
    }
  }]);
}();
var Request = /*#__PURE__*/function () {
  function Request(method, url) {
    _classCallCheck(this, Request);
    this._xhr = new XMLHttpRequest();
    this._xhr.open(method, url, true);
    this._method = method;
    this._url = url;
    this._headers = {};
  }
  return _createClass(Request, [{
    key: "getMethod",
    value: function getMethod() {
      return this._method;
    }
  }, {
    key: "getURL",
    value: function getURL() {
      return this._url;
    }
  }, {
    key: "setHeader",
    value: function setHeader(header, value) {
      this._xhr.setRequestHeader(header, value);
      this._headers[header] = value;
    }
  }, {
    key: "getHeader",
    value: function getHeader(header) {
      return this._headers[header];
    }
  }, {
    key: "setProgressHandler",
    value: function setProgressHandler(progressHandler) {
      // Test support for progress events before attaching an event listener
      if (!('upload' in this._xhr)) {
        return;
      }
      this._xhr.upload.onprogress = function (e) {
        if (!e.lengthComputable) {
          return;
        }
        progressHandler(e.loaded);
      };
    }
  }, {
    key: "send",
    value: function send() {
      var _this = this;
      var body = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : null;
      return new Promise(function (resolve, reject) {
        _this._xhr.onload = function () {
          resolve(new Response(_this._xhr));
        };
        _this._xhr.onerror = function (err) {
          reject(err);
        };
        _this._xhr.send(body);
      });
    }
  }, {
    key: "abort",
    value: function abort() {
      this._xhr.abort();
      return Promise.resolve();
    }
  }, {
    key: "getUnderlyingObject",
    value: function getUnderlyingObject() {
      return this._xhr;
    }
  }]);
}();
var Response = /*#__PURE__*/function () {
  function Response(xhr) {
    _classCallCheck(this, Response);
    this._xhr = xhr;
  }
  return _createClass(Response, [{
    key: "getStatus",
    value: function getStatus() {
      return this._xhr.status;
    }
  }, {
    key: "getHeader",
    value: function getHeader(header) {
      return this._xhr.getResponseHeader(header);
    }
  }, {
    key: "getBody",
    value: function getBody() {
      return this._xhr.responseText;
    }
  }, {
    key: "getUnderlyingObject",
    value: function getUnderlyingObject() {
      return this._xhr;
    }
  }]);
}();

},{}],4:[function(require,module,exports){
"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
Object.defineProperty(exports, "DefaultHttpStack", {
  enumerable: true,
  get: function get() {
    return _httpStack["default"];
  }
});
Object.defineProperty(exports, "DetailedError", {
  enumerable: true,
  get: function get() {
    return _error["default"];
  }
});
exports.Upload = void 0;
Object.defineProperty(exports, "canStoreURLs", {
  enumerable: true,
  get: function get() {
    return _urlStorage.canStoreURLs;
  }
});
exports.defaultOptions = void 0;
Object.defineProperty(exports, "enableDebugLog", {
  enumerable: true,
  get: function get() {
    return _logger.enableDebugLog;
  }
});
exports.isSupported = void 0;
var _error = _interopRequireDefault(require("../error.js"));
var _logger = require("../logger.js");
var _noopUrlStorage = _interopRequireDefault(require("../noopUrlStorage.js"));
var _upload = _interopRequireDefault(require("../upload.js"));
var _fileReader = _interopRequireDefault(require("./fileReader.js"));
var _fileSignature = _interopRequireDefault(require("./fileSignature.js"));
var _httpStack = _interopRequireDefault(require("./httpStack.js"));
var _urlStorage = require("./urlStorage.js");
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor); } }
function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
function _callSuper(t, o, e) { return o = _getPrototypeOf(o), _possibleConstructorReturn(t, _isNativeReflectConstruct() ? Reflect.construct(o, e || [], _getPrototypeOf(t).constructor) : o.apply(t, e)); }
function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } else if (call !== void 0) { throw new TypeError("Derived constructors may only return object or undefined"); } return _assertThisInitialized(self); }
function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
function _isNativeReflectConstruct() { try { var t = !Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); } catch (t) {} return (_isNativeReflectConstruct = function _isNativeReflectConstruct() { return !!t; })(); }
function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf.bind() : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); Object.defineProperty(subClass, "prototype", { writable: false }); if (superClass) _setPrototypeOf(subClass, superClass); }
function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
function ownKeys(e, r) { var t = Object.keys(e); if (Object.getOwnPropertySymbols) { var o = Object.getOwnPropertySymbols(e); r && (o = o.filter(function (r) { return Object.getOwnPropertyDescriptor(e, r).enumerable; })), t.push.apply(t, o); } return t; }
function _objectSpread(e) { for (var r = 1; r < arguments.length; r++) { var t = null != arguments[r] ? arguments[r] : {}; r % 2 ? ownKeys(Object(t), !0).forEach(function (r) { _defineProperty(e, r, t[r]); }) : Object.getOwnPropertyDescriptors ? Object.defineProperties(e, Object.getOwnPropertyDescriptors(t)) : ownKeys(Object(t)).forEach(function (r) { Object.defineProperty(e, r, Object.getOwnPropertyDescriptor(t, r)); }); } return e; }
function _defineProperty(obj, key, value) { key = _toPropertyKey(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == _typeof(i) ? i : i + ""; }
function _toPrimitive(t, r) { if ("object" != _typeof(t) || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != _typeof(i)) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
var defaultOptions = exports.defaultOptions = _objectSpread(_objectSpread({}, _upload["default"].defaultOptions), {}, {
  httpStack: new _httpStack["default"](),
  fileReader: new _fileReader["default"](),
  urlStorage: _urlStorage.canStoreURLs ? new _urlStorage.WebStorageUrlStorage() : new _noopUrlStorage["default"](),
  fingerprint: _fileSignature["default"]
});
var Upload = exports.Upload = /*#__PURE__*/function (_BaseUpload) {
  function Upload() {
    var file = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : null;
    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
    _classCallCheck(this, Upload);
    options = _objectSpread(_objectSpread({}, defaultOptions), options);
    return _callSuper(this, Upload, [file, options]);
  }
  _inherits(Upload, _BaseUpload);
  return _createClass(Upload, null, [{
    key: "terminate",
    value: function terminate(url) {
      var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
      options = _objectSpread(_objectSpread({}, defaultOptions), options);
      return _upload["default"].terminate(url, options);
    }
  }]);
}(_upload["default"]); // Note: We don't reference `window` here because these classes also exist in a Web Worker's context.
var isSupported = exports.isSupported = typeof XMLHttpRequest === 'function' && typeof Blob === 'function' && typeof Blob.prototype.slice === 'function';

},{"../error.js":12,"../logger.js":13,"../noopUrlStorage.js":14,"../upload.js":15,"./fileReader.js":1,"./fileSignature.js":2,"./httpStack.js":3,"./urlStorage.js":11}],5:[function(require,module,exports){
"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = void 0;
var isReactNative = function isReactNative() {
  return typeof navigator !== 'undefined' && typeof navigator.product === 'string' && navigator.product.toLowerCase() === 'reactnative';
};
var _default = exports["default"] = isReactNative;

},{}],6:[function(require,module,exports){
"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = void 0;
var _isCordova = _interopRequireDefault(require("./isCordova.js"));
var _readAsByteArray = _interopRequireDefault(require("./readAsByteArray.js"));
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor); } }
function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == _typeof(i) ? i : i + ""; }
function _toPrimitive(t, r) { if ("object" != _typeof(t) || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != _typeof(i)) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
var FileSource = exports["default"] = /*#__PURE__*/function () {
  // Make this.size a method
  function FileSource(file) {
    _classCallCheck(this, FileSource);
    this._file = file;
    this.size = file.size;
  }
  return _createClass(FileSource, [{
    key: "slice",
    value: function slice(start, end) {
      // In Apache Cordova applications, a File must be resolved using
      // FileReader instances, see
      // https://cordova.apache.org/docs/en/8.x/reference/cordova-plugin-file/index.html#read-a-file
      if ((0, _isCordova["default"])()) {
        return (0, _readAsByteArray["default"])(this._file.slice(start, end));
      }
      var value = this._file.slice(start, end);
      var done = end >= this.size;
      return Promise.resolve({
        value: value,
        done: done
      });
    }
  }, {
    key: "close",
    value: function close() {
      // Nothing to do here since we don't need to release any resources.
    }
  }]);
}();

},{"./isCordova.js":8,"./readAsByteArray.js":9}],7:[function(require,module,exports){
"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = void 0;
function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor); } }
function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == _typeof(i) ? i : i + ""; }
function _toPrimitive(t, r) { if ("object" != _typeof(t) || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != _typeof(i)) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
function len(blobOrArray) {
  if (blobOrArray === undefined) return 0;
  if (blobOrArray.size !== undefined) return blobOrArray.size;
  return blobOrArray.length;
}

/*
  Typed arrays and blobs don't have a concat method.
  This function helps StreamSource accumulate data to reach chunkSize.
*/
function concat(a, b) {
  if (a.concat) {
    // Is `a` an Array?
    return a.concat(b);
  }
  if (a instanceof Blob) {
    return new Blob([a, b], {
      type: a.type
    });
  }
  if (a.set) {
    // Is `a` a typed array?
    var c = new a.constructor(a.length + b.length);
    c.set(a);
    c.set(b, a.length);
    return c;
  }
  throw new Error('Unknown data type');
}
var StreamSource = exports["default"] = /*#__PURE__*/function () {
  function StreamSource(reader) {
    _classCallCheck(this, StreamSource);
    this._buffer = undefined;
    this._bufferOffset = 0;
    this._reader = reader;
    this._done = false;
  }
  return _createClass(StreamSource, [{
    key: "slice",
    value: function slice(start, end) {
      if (start < this._bufferOffset) {
        return Promise.reject(new Error("Requested data is before the reader's current offset"));
      }
      return this._readUntilEnoughDataOrDone(start, end);
    }
  }, {
    key: "_readUntilEnoughDataOrDone",
    value: function _readUntilEnoughDataOrDone(start, end) {
      var _this = this;
      var hasEnoughData = end <= this._bufferOffset + len(this._buffer);
      if (this._done || hasEnoughData) {
        var value = this._getDataFromBuffer(start, end);
        var done = value == null ? this._done : false;
        return Promise.resolve({
          value: value,
          done: done
        });
      }
      return this._reader.read().then(function (_ref) {
        var value = _ref.value,
          done = _ref.done;
        if (done) {
          _this._done = true;
        } else if (_this._buffer === undefined) {
          _this._buffer = value;
        } else {
          _this._buffer = concat(_this._buffer, value);
        }
        return _this._readUntilEnoughDataOrDone(start, end);
      });
    }
  }, {
    key: "_getDataFromBuffer",
    value: function _getDataFromBuffer(start, end) {
      // Remove data from buffer before `start`.
      // Data might be reread from the buffer if an upload fails, so we can only
      // safely delete data when it comes *before* what is currently being read.
      if (start > this._bufferOffset) {
        this._buffer = this._buffer.slice(start - this._bufferOffset);
        this._bufferOffset = start;
      }
      // If the buffer is empty after removing old data, all data has been read.
      var hasAllDataBeenRead = len(this._buffer) === 0;
      if (this._done && hasAllDataBeenRead) {
        return null;
      }
      // We already removed data before `start`, so we just return the first
      // chunk from the buffer.
      return this._buffer.slice(0, end - start);
    }
  }, {
    key: "close",
    value: function close() {
      if (this._reader.cancel) {
        this._reader.cancel();
      }
    }
  }]);
}();

},{}],8:[function(require,module,exports){
"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = void 0;
var isCordova = function isCordova() {
  return typeof window !== 'undefined' && (typeof window.PhoneGap !== 'undefined' || typeof window.Cordova !== 'undefined' || typeof window.cordova !== 'undefined');
};
var _default = exports["default"] = isCordova;

},{}],9:[function(require,module,exports){
"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = readAsByteArray;
/**
 * readAsByteArray converts a File object to a Uint8Array.
 * This function is only used on the Apache Cordova platform.
 * See https://cordova.apache.org/docs/en/latest/reference/cordova-plugin-file/index.html#read-a-file
 */
function readAsByteArray(chunk) {
  return new Promise(function (resolve, reject) {
    var reader = new FileReader();
    reader.onload = function () {
      var value = new Uint8Array(reader.result);
      resolve({
        value: value
      });
    };
    reader.onerror = function (err) {
      reject(err);
    };
    reader.readAsArrayBuffer(chunk);
  });
}

},{}],10:[function(require,module,exports){
"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = uriToBlob;
/**
 * uriToBlob resolves a URI to a Blob object. This is used for
 * React Native to retrieve a file (identified by a file://
 * URI) as a blob.
 */
function uriToBlob(uri) {
  return new Promise(function (resolve, reject) {
    var xhr = new XMLHttpRequest();
    xhr.responseType = 'blob';
    xhr.onload = function () {
      var blob = xhr.response;
      resolve(blob);
    };
    xhr.onerror = function (err) {
      reject(err);
    };
    xhr.open('GET', uri);
    xhr.send();
  });
}

},{}],11:[function(require,module,exports){
"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.canStoreURLs = exports.WebStorageUrlStorage = void 0;
function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor); } }
function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == _typeof(i) ? i : i + ""; }
function _toPrimitive(t, r) { if ("object" != _typeof(t) || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != _typeof(i)) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
var hasStorage = false;
try {
  // Note: localStorage does not exist in the Web Worker's context, so we must use window here.
  hasStorage = 'localStorage' in window;

  // Attempt to store and read entries from the local storage to detect Private
  // Mode on Safari on iOS (see #49)
  // If the key was not used before, we remove it from local storage again to
  // not cause confusion where the entry came from.
  var key = 'tusSupport';
  var originalValue = localStorage.getItem(key);
  localStorage.setItem(key, originalValue);
  if (originalValue === null) localStorage.removeItem(key);
} catch (e) {
  // If we try to access localStorage inside a sandboxed iframe, a SecurityError
  // is thrown. When in private mode on iOS Safari, a QuotaExceededError is
  // thrown (see #49)
  if (e.code === e.SECURITY_ERR || e.code === e.QUOTA_EXCEEDED_ERR) {
    hasStorage = false;
  } else {
    throw e;
  }
}
var canStoreURLs = exports.canStoreURLs = hasStorage;
var WebStorageUrlStorage = exports.WebStorageUrlStorage = /*#__PURE__*/function () {
  function WebStorageUrlStorage() {
    _classCallCheck(this, WebStorageUrlStorage);
  }
  return _createClass(WebStorageUrlStorage, [{
    key: "findAllUploads",
    value: function findAllUploads() {
      var results = this._findEntries('tus::');
      return Promise.resolve(results);
    }
  }, {
    key: "findUploadsByFingerprint",
    value: function findUploadsByFingerprint(fingerprint) {
      var results = this._findEntries("tus::".concat(fingerprint, "::"));
      return Promise.resolve(results);
    }
  }, {
    key: "removeUpload",
    value: function removeUpload(urlStorageKey) {
      localStorage.removeItem(urlStorageKey);
      return Promise.resolve();
    }
  }, {
    key: "addUpload",
    value: function addUpload(fingerprint, upload) {
      var id = Math.round(Math.random() * 1e12);
      var key = "tus::".concat(fingerprint, "::").concat(id);
      localStorage.setItem(key, JSON.stringify(upload));
      return Promise.resolve(key);
    }
  }, {
    key: "_findEntries",
    value: function _findEntries(prefix) {
      var results = [];
      for (var i = 0; i < localStorage.length; i++) {
        var _key = localStorage.key(i);
        if (_key.indexOf(prefix) !== 0) continue;
        try {
          var upload = JSON.parse(localStorage.getItem(_key));
          upload.urlStorageKey = _key;
          results.push(upload);
        } catch (_e) {
          // The JSON parse error is intentionally ignored here, so a malformed
          // entry in the storage cannot prevent an upload.
        }
      }
      return results;
    }
  }]);
}();

},{}],12:[function(require,module,exports){
"use strict";

function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = void 0;
function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor); } }
function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == _typeof(i) ? i : i + ""; }
function _toPrimitive(t, r) { if ("object" != _typeof(t) || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != _typeof(i)) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
function _callSuper(t, o, e) { return o = _getPrototypeOf(o), _possibleConstructorReturn(t, _isNativeReflectConstruct() ? Reflect.construct(o, e || [], _getPrototypeOf(t).constructor) : o.apply(t, e)); }
function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } else if (call !== void 0) { throw new TypeError("Derived constructors may only return object or undefined"); } return _assertThisInitialized(self); }
function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); Object.defineProperty(subClass, "prototype", { writable: false }); if (superClass) _setPrototypeOf(subClass, superClass); }
function _wrapNativeSuper(Class) { var _cache = typeof Map === "function" ? new Map() : undefined; _wrapNativeSuper = function _wrapNativeSuper(Class) { if (Class === null || !_isNativeFunction(Class)) return Class; if (typeof Class !== "function") { throw new TypeError("Super expression must either be null or a function"); } if (typeof _cache !== "undefined") { if (_cache.has(Class)) return _cache.get(Class); _cache.set(Class, Wrapper); } function Wrapper() { return _construct(Class, arguments, _getPrototypeOf(this).constructor); } Wrapper.prototype = Object.create(Class.prototype, { constructor: { value: Wrapper, enumerable: false, writable: true, configurable: true } }); return _setPrototypeOf(Wrapper, Class); }; return _wrapNativeSuper(Class); }
function _construct(t, e, r) { if (_isNativeReflectConstruct()) return Reflect.construct.apply(null, arguments); var o = [null]; o.push.apply(o, e); var p = new (t.bind.apply(t, o))(); return r && _setPrototypeOf(p, r.prototype), p; }
function _isNativeReflectConstruct() { try { var t = !Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); } catch (t) {} return (_isNativeReflectConstruct = function _isNativeReflectConstruct() { return !!t; })(); }
function _isNativeFunction(fn) { try { return Function.toString.call(fn).indexOf("[native code]") !== -1; } catch (e) { return typeof fn === "function"; } }
function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf.bind() : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
var DetailedError = /*#__PURE__*/function (_Error) {
  function DetailedError(message) {
    var _this;
    var causingErr = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : null;
    var req = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;
    var res = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : null;
    _classCallCheck(this, DetailedError);
    _this = _callSuper(this, DetailedError, [message]);
    _this.originalRequest = req;
    _this.originalResponse = res;
    _this.causingError = causingErr;
    if (causingErr != null) {
      message += ", caused by ".concat(causingErr.toString());
    }
    if (req != null) {
      var requestId = req.getHeader('X-Request-ID') || 'n/a';
      var method = req.getMethod();
      var url = req.getURL();
      var status = res ? res.getStatus() : 'n/a';
      var body = res ? res.getBody() || '' : 'n/a';
      message += ", originated from request (method: ".concat(method, ", url: ").concat(url, ", response code: ").concat(status, ", response text: ").concat(body, ", request id: ").concat(requestId, ")");
    }
    _this.message = message;
    return _this;
  }
  _inherits(DetailedError, _Error);
  return _createClass(DetailedError);
}( /*#__PURE__*/_wrapNativeSuper(Error));
var _default = exports["default"] = DetailedError;

},{}],13:[function(require,module,exports){
"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.enableDebugLog = enableDebugLog;
exports.log = log;
var isEnabled = false;
function enableDebugLog() {
  isEnabled = true;
}
function log(msg) {
  if (!isEnabled) return;
  console.log(msg);
}

},{}],14:[function(require,module,exports){
"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = void 0;
function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor); } }
function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == _typeof(i) ? i : i + ""; }
function _toPrimitive(t, r) { if ("object" != _typeof(t) || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != _typeof(i)) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
var NoopUrlStorage = exports["default"] = /*#__PURE__*/function () {
  function NoopUrlStorage() {
    _classCallCheck(this, NoopUrlStorage);
  }
  return _createClass(NoopUrlStorage, [{
    key: "listAllUploads",
    value: function listAllUploads() {
      return Promise.resolve([]);
    }
  }, {
    key: "findUploadsByFingerprint",
    value: function findUploadsByFingerprint(_fingerprint) {
      return Promise.resolve([]);
    }
  }, {
    key: "removeUpload",
    value: function removeUpload(_urlStorageKey) {
      return Promise.resolve();
    }
  }, {
    key: "addUpload",
    value: function addUpload(_fingerprint, _upload) {
      return Promise.resolve(null);
    }
  }]);
}();

},{}],15:[function(require,module,exports){
"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = void 0;
var _jsBase = require("js-base64");
var _urlParse = _interopRequireDefault(require("url-parse"));
var _error = _interopRequireDefault(require("./error.js"));
var _logger = require("./logger.js");
var _uuid = _interopRequireDefault(require("./uuid.js"));
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
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function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _unsupportedIterableToArray(arr, i) || _nonIterableRest(); }
function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
function _iterableToArrayLimit(r, l) { var t = null == r ? null : "undefined" != typeof Symbol && r[Symbol.iterator] || r["@@iterator"]; if (null != t) { var e, n, i, u, a = [], f = !0, o = !1; try { if (i = (t = t.call(r)).next, 0 === l) { if (Object(t) !== t) return; f = !1; } else for (; !(f = (e = i.call(t)).done) && (a.push(e.value), a.length !== l); f = !0); } catch (r) { o = !0, n = r; } finally { try { if (!f && null != t["return"] && (u = t["return"](), Object(u) !== u)) return; } finally { if (o) throw n; } } return a; } }
function _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }
function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
function _createForOfIteratorHelper(o, allowArrayLike) { var it = typeof Symbol !== "undefined" && o[Symbol.iterator] || o["@@iterator"]; if (!it) { if (Array.isArray(o) || (it = _unsupportedIterableToArray(o)) || allowArrayLike && o && typeof o.length === "number") { if (it) o = it; var i = 0; var F = function F() {}; return { s: F, n: function n() { if (i >= o.length) return { done: true }; return { done: false, value: o[i++] }; }, e: function e(_e) { throw _e; }, f: F }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } var normalCompletion = true, didErr = false, err; return { s: function s() { it = it.call(o); }, n: function n() { var step = it.next(); normalCompletion = step.done; return step; }, e: function e(_e2) { didErr = true; err = _e2; }, f: function f() { try { if (!normalCompletion && it["return"] != null) it["return"](); } finally { if (didErr) throw err; } } }; }
function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) arr2[i] = arr[i]; return arr2; }
function ownKeys(e, r) { var t = Object.keys(e); if (Object.getOwnPropertySymbols) { var o = Object.getOwnPropertySymbols(e); r && (o = o.filter(function (r) { return Object.getOwnPropertyDescriptor(e, r).enumerable; })), t.push.apply(t, o); } return t; }
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function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor); } }
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function _toPrimitive(t, r) { if ("object" != _typeof(t) || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != _typeof(i)) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
var PROTOCOL_TUS_V1 = 'tus-v1';
var PROTOCOL_IETF_DRAFT_03 = 'ietf-draft-03';
var PROTOCOL_IETF_DRAFT_05 = 'ietf-draft-05';
var defaultOptions = {
  endpoint: null,
  uploadUrl: null,
  metadata: {},
  metadataForPartialUploads: {},
  fingerprint: null,
  uploadSize: null,
  onProgress: null,
  onChunkComplete: null,
  onSuccess: null,
  onError: null,
  onUploadUrlAvailable: null,
  overridePatchMethod: false,
  headers: {},
  addRequestId: false,
  onBeforeRequest: null,
  onAfterResponse: null,
  onShouldRetry: defaultOnShouldRetry,
  chunkSize: Number.POSITIVE_INFINITY,
  retryDelays: [0, 1000, 3000, 5000],
  parallelUploads: 1,
  parallelUploadBoundaries: null,
  storeFingerprintForResuming: true,
  removeFingerprintOnSuccess: false,
  uploadLengthDeferred: false,
  uploadDataDuringCreation: false,
  urlStorage: null,
  fileReader: null,
  httpStack: null,
  protocol: PROTOCOL_TUS_V1
};
var BaseUpload = /*#__PURE__*/function () {
  function BaseUpload(file, options) {
    _classCallCheck(this, BaseUpload);
    // Warn about removed options from previous versions
    if ('resume' in options) {
      console.log('tus: The `resume` option has been removed in tus-js-client v2. Please use the URL storage API instead.');
    }

    // The default options will already be added from the wrapper classes.
    this.options = options;

    // Cast chunkSize to integer
    this.options.chunkSize = Number(this.options.chunkSize);

    // The storage module used to store URLs
    this._urlStorage = this.options.urlStorage;

    // The underlying File/Blob object
    this.file = file;

    // The URL against which the file will be uploaded
    this.url = null;

    // The underlying request object for the current PATCH request
    this._req = null;

    // The fingerpinrt for the current file (set after start())
    this._fingerprint = null;

    // The key that the URL storage returned when saving an URL with a fingerprint,
    this._urlStorageKey = null;

    // The offset used in the current PATCH request
    this._offset = null;

    // True if the current PATCH request has been aborted
    this._aborted = false;

    // The file's size in bytes
    this._size = null;

    // The Source object which will wrap around the given file and provides us
    // with a unified interface for getting its size and slice chunks from its
    // content allowing us to easily handle Files, Blobs, Buffers and Streams.
    this._source = null;

    // The current count of attempts which have been made. Zero indicates none.
    this._retryAttempt = 0;

    // The timeout's ID which is used to delay the next retry
    this._retryTimeout = null;

    // The offset of the remote upload before the latest attempt was started.
    this._offsetBeforeRetry = 0;

    // An array of BaseUpload instances which are used for uploading the different
    // parts, if the parallelUploads option is used.
    this._parallelUploads = null;

    // An array of upload URLs which are used for uploading the different
    // parts, if the parallelUploads option is used.
    this._parallelUploadUrls = null;
  }

  /**
   * Use the Termination extension to delete an upload from the server by sending a DELETE
   * request to the specified upload URL. This is only possible if the server supports the
   * Termination extension. If the `options.retryDelays` property is set, the method will
   * also retry if an error ocurrs.
   *
   * @param {String} url The upload's URL which will be terminated.
   * @param {object} options Optional options for influencing HTTP requests.
   * @return {Promise} The Promise will be resolved/rejected when the requests finish.
   */
  return _createClass(BaseUpload, [{
    key: "findPreviousUploads",
    value: function findPreviousUploads() {
      var _this = this;
      return this.options.fingerprint(this.file, this.options).then(function (fingerprint) {
        return _this._urlStorage.findUploadsByFingerprint(fingerprint);
      });
    }
  }, {
    key: "resumeFromPreviousUpload",
    value: function resumeFromPreviousUpload(previousUpload) {
      this.url = previousUpload.uploadUrl || null;
      this._parallelUploadUrls = previousUpload.parallelUploadUrls || null;
      this._urlStorageKey = previousUpload.urlStorageKey;
    }
  }, {
    key: "start",
    value: function start() {
      var _this2 = this;
      var file = this.file;
      if (!file) {
        this._emitError(new Error('tus: no file or stream to upload provided'));
        return;
      }
      if (![PROTOCOL_TUS_V1, PROTOCOL_IETF_DRAFT_03, PROTOCOL_IETF_DRAFT_05].includes(this.options.protocol)) {
        this._emitError(new Error("tus: unsupported protocol ".concat(this.options.protocol)));
        return;
      }
      if (!this.options.endpoint && !this.options.uploadUrl && !this.url) {
        this._emitError(new Error('tus: neither an endpoint or an upload URL is provided'));
        return;
      }
      var retryDelays = this.options.retryDelays;
      if (retryDelays != null && Object.prototype.toString.call(retryDelays) !== '[object Array]') {
        this._emitError(new Error('tus: the `retryDelays` option must either be an array or null'));
        return;
      }
      if (this.options.parallelUploads > 1) {
        // Test which options are incompatible with parallel uploads.
        for (var _i = 0, _arr = ['uploadUrl', 'uploadSize', 'uploadLengthDeferred']; _i < _arr.length; _i++) {
          var optionName = _arr[_i];
          if (this.options[optionName]) {
            this._emitError(new Error("tus: cannot use the ".concat(optionName, " option when parallelUploads is enabled")));
            return;
          }
        }
      }
      if (this.options.parallelUploadBoundaries) {
        if (this.options.parallelUploads <= 1) {
          this._emitError(new Error('tus: cannot use the `parallelUploadBoundaries` option when `parallelUploads` is disabled'));
          return;
        }
        if (this.options.parallelUploads !== this.options.parallelUploadBoundaries.length) {
          this._emitError(new Error('tus: the `parallelUploadBoundaries` must have the same length as the value of `parallelUploads`'));
          return;
        }
      }
      this.options.fingerprint(file, this.options).then(function (fingerprint) {
        if (fingerprint == null) {
          (0, _logger.log)('No fingerprint was calculated meaning that the upload cannot be stored in the URL storage.');
        } else {
          (0, _logger.log)("Calculated fingerprint: ".concat(fingerprint));
        }
        _this2._fingerprint = fingerprint;
        if (_this2._source) {
          return _this2._source;
        }
        return _this2.options.fileReader.openFile(file, _this2.options.chunkSize);
      }).then(function (source) {
        _this2._source = source;

        // First, we look at the uploadLengthDeferred option.
        // Next, we check if the caller has supplied a manual upload size.
        // Finally, we try to use the calculated size from the source object.
        if (_this2.options.uploadLengthDeferred) {
          _this2._size = null;
        } else if (_this2.options.uploadSize != null) {
          _this2._size = Number(_this2.options.uploadSize);
          if (Number.isNaN(_this2._size)) {
            _this2._emitError(new Error('tus: cannot convert `uploadSize` option into a number'));
            return;
          }
        } else {
          _this2._size = _this2._source.size;
          if (_this2._size == null) {
            _this2._emitError(new Error("tus: cannot automatically derive upload's size from input. Specify it manually using the `uploadSize` option or use the `uploadLengthDeferred` option"));
            return;
          }
        }

        // If the upload was configured to use multiple requests or if we resume from
        // an upload which used multiple requests, we start a parallel upload.
        if (_this2.options.parallelUploads > 1 || _this2._parallelUploadUrls != null) {
          _this2._startParallelUpload();
        } else {
          _this2._startSingleUpload();
        }
      })["catch"](function (err) {
        _this2._emitError(err);
      });
    }

    /**
     * Initiate the uploading procedure for a parallelized upload, where one file is split into
     * multiple request which are run in parallel.
     *
     * @api private
     */
  }, {
    key: "_startParallelUpload",
    value: function _startParallelUpload() {
      var _this$options$paralle,
        _this3 = this;
      var totalSize = this._size;
      var totalProgress = 0;
      this._parallelUploads = [];
      var partCount = this._parallelUploadUrls != null ? this._parallelUploadUrls.length : this.options.parallelUploads;

      // The input file will be split into multiple slices which are uploaded in separate
      // requests. Here we get the start and end position for the slices.
      var parts = (_this$options$paralle = this.options.parallelUploadBoundaries) !== null && _this$options$paralle !== void 0 ? _this$options$paralle : splitSizeIntoParts(this._source.size, partCount);

      // Attach URLs from previous uploads, if available.
      if (this._parallelUploadUrls) {
        parts.forEach(function (part, index) {
          part.uploadUrl = _this3._parallelUploadUrls[index] || null;
        });
      }

      // Create an empty list for storing the upload URLs
      this._parallelUploadUrls = new Array(parts.length);

      // Generate a promise for each slice that will be resolve if the respective
      // upload is completed.
      var uploads = parts.map(function (part, index) {
        var lastPartProgress = 0;
        return _this3._source.slice(part.start, part.end).then(function (_ref) {
          var value = _ref.value;
          return new Promise(function (resolve, reject) {
            // Merge with the user supplied options but overwrite some values.
            var options = _objectSpread(_objectSpread({}, _this3.options), {}, {
              // If available, the partial upload should be resumed from a previous URL.
              uploadUrl: part.uploadUrl || null,
              // We take manually care of resuming for partial uploads, so they should
              // not be stored in the URL storage.
              storeFingerprintForResuming: false,
              removeFingerprintOnSuccess: false,
              // Reset the parallelUploads option to not cause recursion.
              parallelUploads: 1,
              // Reset this option as we are not doing a parallel upload.
              parallelUploadBoundaries: null,
              metadata: _this3.options.metadataForPartialUploads,
              // Add the header to indicate the this is a partial upload.
              headers: _objectSpread(_objectSpread({}, _this3.options.headers), {}, {
                'Upload-Concat': 'partial'
              }),
              // Reject or resolve the promise if the upload errors or completes.
              onSuccess: resolve,
              onError: reject,
              // Based in the progress for this partial upload, calculate the progress
              // for the entire final upload.
              onProgress: function onProgress(newPartProgress) {
                totalProgress = totalProgress - lastPartProgress + newPartProgress;
                lastPartProgress = newPartProgress;
                _this3._emitProgress(totalProgress, totalSize);
              },
              // Wait until every partial upload has an upload URL, so we can add
              // them to the URL storage.
              onUploadUrlAvailable: function onUploadUrlAvailable() {
                _this3._parallelUploadUrls[index] = upload.url;
                // Test if all uploads have received an URL
                if (_this3._parallelUploadUrls.filter(function (u) {
                  return Boolean(u);
                }).length === parts.length) {
                  _this3._saveUploadInUrlStorage();
                }
              }
            });
            var upload = new BaseUpload(value, options);
            upload.start();

            // Store the upload in an array, so we can later abort them if necessary.
            _this3._parallelUploads.push(upload);
          });
        });
      });
      var req;
      // Wait until all partial uploads are finished and we can send the POST request for
      // creating the final upload.
      Promise.all(uploads).then(function () {
        req = _this3._openRequest('POST', _this3.options.endpoint);
        req.setHeader('Upload-Concat', "final;".concat(_this3._parallelUploadUrls.join(' ')));

        // Add metadata if values have been added
        var metadata = encodeMetadata(_this3.options.metadata);
        if (metadata !== '') {
          req.setHeader('Upload-Metadata', metadata);
        }
        return _this3._sendRequest(req, null);
      }).then(function (res) {
        if (!inStatusCategory(res.getStatus(), 200)) {
          _this3._emitHttpError(req, res, 'tus: unexpected response while creating upload');
          return;
        }
        var location = res.getHeader('Location');
        if (location == null) {
          _this3._emitHttpError(req, res, 'tus: invalid or missing Location header');
          return;
        }
        _this3.url = resolveUrl(_this3.options.endpoint, location);
        (0, _logger.log)("Created upload at ".concat(_this3.url));
        _this3._emitSuccess(res);
      })["catch"](function (err) {
        _this3._emitError(err);
      });
    }

    /**
     * Initiate the uploading procedure for a non-parallel upload. Here the entire file is
     * uploaded in a sequential matter.
     *
     * @api private
     */
  }, {
    key: "_startSingleUpload",
    value: function _startSingleUpload() {
      // Reset the aborted flag when the upload is started or else the
      // _performUpload will stop before sending a request if the upload has been
      // aborted previously.
      this._aborted = false;

      // The upload had been started previously and we should reuse this URL.
      if (this.url != null) {
        (0, _logger.log)("Resuming upload from previous URL: ".concat(this.url));
        this._resumeUpload();
        return;
      }

      // A URL has manually been specified, so we try to resume
      if (this.options.uploadUrl != null) {
        (0, _logger.log)("Resuming upload from provided URL: ".concat(this.options.uploadUrl));
        this.url = this.options.uploadUrl;
        this._resumeUpload();
        return;
      }

      // An upload has not started for the file yet, so we start a new one
      (0, _logger.log)('Creating a new upload');
      this._createUpload();
    }

    /**
     * Abort any running request and stop the current upload. After abort is called, no event
     * handler will be invoked anymore. You can use the `start` method to resume the upload
     * again.
     * If `shouldTerminate` is true, the `terminate` function will be called to remove the
     * current upload from the server.
     *
     * @param {boolean} shouldTerminate True if the upload should be deleted from the server.
     * @return {Promise} The Promise will be resolved/rejected when the requests finish.
     */
  }, {
    key: "abort",
    value: function abort(shouldTerminate) {
      var _this4 = this;
      // Stop any parallel partial uploads, that have been started in _startParallelUploads.
      if (this._parallelUploads != null) {
        var _iterator = _createForOfIteratorHelper(this._parallelUploads),
          _step;
        try {
          for (_iterator.s(); !(_step = _iterator.n()).done;) {
            var upload = _step.value;
            upload.abort(shouldTerminate);
          }
        } catch (err) {
          _iterator.e(err);
        } finally {
          _iterator.f();
        }
      }

      // Stop any current running request.
      if (this._req !== null) {
        this._req.abort();
        // Note: We do not close the file source here, so the user can resume in the future.
      }
      this._aborted = true;

      // Stop any timeout used for initiating a retry.
      if (this._retryTimeout != null) {
        clearTimeout(this._retryTimeout);
        this._retryTimeout = null;
      }
      if (!shouldTerminate || this.url == null) {
        return Promise.resolve();
      }
      return BaseUpload.terminate(this.url, this.options)
      // Remove entry from the URL storage since the upload URL is no longer valid.
      .then(function () {
        return _this4._removeFromUrlStorage();
      });
    }
  }, {
    key: "_emitHttpError",
    value: function _emitHttpError(req, res, message, causingErr) {
      this._emitError(new _error["default"](message, causingErr, req, res));
    }
  }, {
    key: "_emitError",
    value: function _emitError(err) {
      var _this5 = this;
      // Do not emit errors, e.g. from aborted HTTP requests, if the upload has been stopped.
      if (this._aborted) return;

      // Check if we should retry, when enabled, before sending the error to the user.
      if (this.options.retryDelays != null) {
        // We will reset the attempt counter if
        // - we were already able to connect to the server (offset != null) and
        // - we were able to upload a small chunk of data to the server
        var shouldResetDelays = this._offset != null && this._offset > this._offsetBeforeRetry;
        if (shouldResetDelays) {
          this._retryAttempt = 0;
        }
        if (shouldRetry(err, this._retryAttempt, this.options)) {
          var delay = this.options.retryDelays[this._retryAttempt++];
          this._offsetBeforeRetry = this._offset;
          this._retryTimeout = setTimeout(function () {
            _this5.start();
          }, delay);
          return;
        }
      }
      if (typeof this.options.onError === 'function') {
        this.options.onError(err);
      } else {
        throw err;
      }
    }

    /**
     * Publishes notification if the upload has been successfully completed.
     *
     * @param {object} lastResponse Last HTTP response.
     * @api private
     */
  }, {
    key: "_emitSuccess",
    value: function _emitSuccess(lastResponse) {
      if (this.options.removeFingerprintOnSuccess) {
        // Remove stored fingerprint and corresponding endpoint. This causes
        // new uploads of the same file to be treated as a different file.
        this._removeFromUrlStorage();
      }
      if (typeof this.options.onSuccess === 'function') {
        this.options.onSuccess({
          lastResponse: lastResponse
        });
      }
    }

    /**
     * Publishes notification when data has been sent to the server. This
     * data may not have been accepted by the server yet.
     *
     * @param {number} bytesSent  Number of bytes sent to the server.
     * @param {number} bytesTotal Total number of bytes to be sent to the server.
     * @api private
     */
  }, {
    key: "_emitProgress",
    value: function _emitProgress(bytesSent, bytesTotal) {
      if (typeof this.options.onProgress === 'function') {
        this.options.onProgress(bytesSent, bytesTotal);
      }
    }

    /**
     * Publishes notification when a chunk of data has been sent to the server
     * and accepted by the server.
     * @param {number} chunkSize  Size of the chunk that was accepted by the server.
     * @param {number} bytesAccepted Total number of bytes that have been
     *                                accepted by the server.
     * @param {number} bytesTotal Total number of bytes to be sent to the server.
     * @api private
     */
  }, {
    key: "_emitChunkComplete",
    value: function _emitChunkComplete(chunkSize, bytesAccepted, bytesTotal) {
      if (typeof this.options.onChunkComplete === 'function') {
        this.options.onChunkComplete(chunkSize, bytesAccepted, bytesTotal);
      }
    }

    /**
     * Create a new upload using the creation extension by sending a POST
     * request to the endpoint. After successful creation the file will be
     * uploaded
     *
     * @api private
     */
  }, {
    key: "_createUpload",
    value: function _createUpload() {
      var _this6 = this;
      if (!this.options.endpoint) {
        this._emitError(new Error('tus: unable to create upload because no endpoint is provided'));
        return;
      }
      var req = this._openRequest('POST', this.options.endpoint);
      if (this.options.uploadLengthDeferred) {
        req.setHeader('Upload-Defer-Length', '1');
      } else {
        req.setHeader('Upload-Length', "".concat(this._size));
      }

      // Add metadata if values have been added
      var metadata = encodeMetadata(this.options.metadata);
      if (metadata !== '') {
        req.setHeader('Upload-Metadata', metadata);
      }
      var promise;
      if (this.options.uploadDataDuringCreation && !this.options.uploadLengthDeferred) {
        this._offset = 0;
        promise = this._addChunkToRequest(req);
      } else {
        if (this.options.protocol === PROTOCOL_IETF_DRAFT_03 || this.options.protocol === PROTOCOL_IETF_DRAFT_05) {
          req.setHeader('Upload-Complete', '?0');
        }
        promise = this._sendRequest(req, null);
      }
      promise.then(function (res) {
        if (!inStatusCategory(res.getStatus(), 200)) {
          _this6._emitHttpError(req, res, 'tus: unexpected response while creating upload');
          return;
        }
        var location = res.getHeader('Location');
        if (location == null) {
          _this6._emitHttpError(req, res, 'tus: invalid or missing Location header');
          return;
        }
        _this6.url = resolveUrl(_this6.options.endpoint, location);
        (0, _logger.log)("Created upload at ".concat(_this6.url));
        if (typeof _this6.options.onUploadUrlAvailable === 'function') {
          _this6.options.onUploadUrlAvailable();
        }
        if (_this6._size === 0) {
          // Nothing to upload and file was successfully created
          _this6._emitSuccess(res);
          _this6._source.close();
          return;
        }
        _this6._saveUploadInUrlStorage().then(function () {
          if (_this6.options.uploadDataDuringCreation) {
            _this6._handleUploadResponse(req, res);
          } else {
            _this6._offset = 0;
            _this6._performUpload();
          }
        });
      })["catch"](function (err) {
        _this6._emitHttpError(req, null, 'tus: failed to create upload', err);
      });
    }

    /*
     * Try to resume an existing upload. First a HEAD request will be sent
     * to retrieve the offset. If the request fails a new upload will be
     * created. In the case of a successful response the file will be uploaded.
     *
     * @api private
     */
  }, {
    key: "_resumeUpload",
    value: function _resumeUpload() {
      var _this7 = this;
      var req = this._openRequest('HEAD', this.url);
      var promise = this._sendRequest(req, null);
      promise.then(function (res) {
        var status = res.getStatus();
        if (!inStatusCategory(status, 200)) {
          // If the upload is locked (indicated by the 423 Locked status code), we
          // emit an error instead of directly starting a new upload. This way the
          // retry logic can catch the error and will retry the upload. An upload
          // is usually locked for a short period of time and will be available
          // afterwards.
          if (status === 423) {
            _this7._emitHttpError(req, res, 'tus: upload is currently locked; retry later');
            return;
          }
          if (inStatusCategory(status, 400)) {
            // Remove stored fingerprint and corresponding endpoint,
            // on client errors since the file can not be found
            _this7._removeFromUrlStorage();
          }
          if (!_this7.options.endpoint) {
            // Don't attempt to create a new upload if no endpoint is provided.
            _this7._emitHttpError(req, res, 'tus: unable to resume upload (new upload cannot be created without an endpoint)');
            return;
          }

          // Try to create a new upload
          _this7.url = null;
          _this7._createUpload();
          return;
        }
        var offset = Number.parseInt(res.getHeader('Upload-Offset'), 10);
        if (Number.isNaN(offset)) {
          _this7._emitHttpError(req, res, 'tus: invalid or missing offset value');
          return;
        }
        var length = Number.parseInt(res.getHeader('Upload-Length'), 10);
        if (Number.isNaN(length) && !_this7.options.uploadLengthDeferred && _this7.options.protocol === PROTOCOL_TUS_V1) {
          _this7._emitHttpError(req, res, 'tus: invalid or missing length value');
          return;
        }
        if (typeof _this7.options.onUploadUrlAvailable === 'function') {
          _this7.options.onUploadUrlAvailable();
        }
        _this7._saveUploadInUrlStorage().then(function () {
          // Upload has already been completed and we do not need to send additional
          // data to the server
          if (offset === length) {
            _this7._emitProgress(length, length);
            _this7._emitSuccess(res);
            return;
          }
          _this7._offset = offset;
          _this7._performUpload();
        });
      })["catch"](function (err) {
        _this7._emitHttpError(req, null, 'tus: failed to resume upload', err);
      });
    }

    /**
     * Start uploading the file using PATCH requests. The file will be divided
     * into chunks as specified in the chunkSize option. During the upload
     * the onProgress event handler may be invoked multiple times.
     *
     * @api private
     */
  }, {
    key: "_performUpload",
    value: function _performUpload() {
      var _this8 = this;
      // If the upload has been aborted, we will not send the next PATCH request.
      // This is important if the abort method was called during a callback, such
      // as onChunkComplete or onProgress.
      if (this._aborted) {
        return;
      }
      var req;

      // Some browser and servers may not support the PATCH method. For those
      // cases, you can tell tus-js-client to use a POST request with the
      // X-HTTP-Method-Override header for simulating a PATCH request.
      if (this.options.overridePatchMethod) {
        req = this._openRequest('POST', this.url);
        req.setHeader('X-HTTP-Method-Override', 'PATCH');
      } else {
        req = this._openRequest('PATCH', this.url);
      }
      req.setHeader('Upload-Offset', "".concat(this._offset));
      var promise = this._addChunkToRequest(req);
      promise.then(function (res) {
        if (!inStatusCategory(res.getStatus(), 200)) {
          _this8._emitHttpError(req, res, 'tus: unexpected response while uploading chunk');
          return;
        }
        _this8._handleUploadResponse(req, res);
      })["catch"](function (err) {
        // Don't emit an error if the upload was aborted manually
        if (_this8._aborted) {
          return;
        }
        _this8._emitHttpError(req, null, "tus: failed to upload chunk at offset ".concat(_this8._offset), err);
      });
    }

    /**
     * _addChunktoRequest reads a chunk from the source and sends it using the
     * supplied request object. It will not handle the response.
     *
     * @api private
     */
  }, {
    key: "_addChunkToRequest",
    value: function _addChunkToRequest(req) {
      var _this9 = this;
      var start = this._offset;
      var end = this._offset + this.options.chunkSize;
      req.setProgressHandler(function (bytesSent) {
        _this9._emitProgress(start + bytesSent, _this9._size);
      });
      if (this.options.protocol === PROTOCOL_TUS_V1) {
        req.setHeader('Content-Type', 'application/offset+octet-stream');
      } else if (this.options.protocol === PROTOCOL_IETF_DRAFT_05) {
        req.setHeader('Content-Type', 'application/partial-upload');
      }

      // The specified chunkSize may be Infinity or the calcluated end position
      // may exceed the file's size. In both cases, we limit the end position to
      // the input's total size for simpler calculations and correctness.
      if ((end === Number.POSITIVE_INFINITY || end > this._size) && !this.options.uploadLengthDeferred) {
        end = this._size;
      }
      return this._source.slice(start, end).then(function (_ref2) {
        var value = _ref2.value,
          done = _ref2.done;
        var valueSize = value !== null && value !== void 0 && value.size ? value.size : 0;

        // If the upload length is deferred, the upload size was not specified during
        // upload creation. So, if the file reader is done reading, we know the total
        // upload size and can tell the tus server.
        if (_this9.options.uploadLengthDeferred && done) {
          _this9._size = _this9._offset + valueSize;
          req.setHeader('Upload-Length', "".concat(_this9._size));
        }

        // The specified uploadSize might not match the actual amount of data that a source
        // provides. In these cases, we cannot successfully complete the upload, so we
        // rather error out and let the user know. If not, tus-js-client will be stuck
        // in a loop of repeating empty PATCH requests.
        // See https://community.transloadit.com/t/how-to-abort-hanging-companion-uploads/16488/13
        var newSize = _this9._offset + valueSize;
        if (!_this9.options.uploadLengthDeferred && done && newSize !== _this9._size) {
          return Promise.reject(new Error("upload was configured with a size of ".concat(_this9._size, " bytes, but the source is done after ").concat(newSize, " bytes")));
        }
        if (value === null) {
          return _this9._sendRequest(req);
        }
        if (_this9.options.protocol === PROTOCOL_IETF_DRAFT_03 || _this9.options.protocol === PROTOCOL_IETF_DRAFT_05) {
          req.setHeader('Upload-Complete', done ? '?1' : '?0');
        }
        _this9._emitProgress(_this9._offset, _this9._size);
        return _this9._sendRequest(req, value);
      });
    }

    /**
     * _handleUploadResponse is used by requests that haven been sent using _addChunkToRequest
     * and already have received a response.
     *
     * @api private
     */
  }, {
    key: "_handleUploadResponse",
    value: function _handleUploadResponse(req, res) {
      var offset = Number.parseInt(res.getHeader('Upload-Offset'), 10);
      if (Number.isNaN(offset)) {
        this._emitHttpError(req, res, 'tus: invalid or missing offset value');
        return;
      }
      this._emitProgress(offset, this._size);
      this._emitChunkComplete(offset - this._offset, offset, this._size);
      this._offset = offset;
      if (offset === this._size) {
        // Yay, finally done :)
        this._emitSuccess(res);
        this._source.close();
        return;
      }
      this._performUpload();
    }

    /**
     * Create a new HTTP request object with the given method and URL.
     *
     * @api private
     */
  }, {
    key: "_openRequest",
    value: function _openRequest(method, url) {
      var req = openRequest(method, url, this.options);
      this._req = req;
      return req;
    }

    /**
     * Remove the entry in the URL storage, if it has been saved before.
     *
     * @api private
     */
  }, {
    key: "_removeFromUrlStorage",
    value: function _removeFromUrlStorage() {
      var _this10 = this;
      if (!this._urlStorageKey) return;
      this._urlStorage.removeUpload(this._urlStorageKey)["catch"](function (err) {
        _this10._emitError(err);
      });
      this._urlStorageKey = null;
    }

    /**
     * Add the upload URL to the URL storage, if possible.
     *
     * @api private
     */
  }, {
    key: "_saveUploadInUrlStorage",
    value: function _saveUploadInUrlStorage() {
      var _this11 = this;
      // We do not store the upload URL
      // - if it was disabled in the option, or
      // - if no fingerprint was calculated for the input (i.e. a stream), or
      // - if the URL is already stored (i.e. key is set alread).
      if (!this.options.storeFingerprintForResuming || !this._fingerprint || this._urlStorageKey !== null) {
        return Promise.resolve();
      }
      var storedUpload = {
        size: this._size,
        metadata: this.options.metadata,
        creationTime: new Date().toString()
      };
      if (this._parallelUploads) {
        // Save multiple URLs if the parallelUploads option is used ...
        storedUpload.parallelUploadUrls = this._parallelUploadUrls;
      } else {
        // ... otherwise we just save the one available URL.
        storedUpload.uploadUrl = this.url;
      }
      return this._urlStorage.addUpload(this._fingerprint, storedUpload).then(function (urlStorageKey) {
        _this11._urlStorageKey = urlStorageKey;
      });
    }

    /**
     * Send a request with the provided body.
     *
     * @api private
     */
  }, {
    key: "_sendRequest",
    value: function _sendRequest(req) {
      var body = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : null;
      return sendRequest(req, body, this.options);
    }
  }], [{
    key: "terminate",
    value: function terminate(url) {
      var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
      var req = openRequest('DELETE', url, options);
      return sendRequest(req, null, options).then(function (res) {
        // A 204 response indicates a successfull request
        if (res.getStatus() === 204) {
          return;
        }
        throw new _error["default"]('tus: unexpected response while terminating upload', null, req, res);
      })["catch"](function (err) {
        if (!(err instanceof _error["default"])) {
          err = new _error["default"]('tus: failed to terminate upload', err, req, null);
        }
        if (!shouldRetry(err, 0, options)) {
          throw err;
        }

        // Instead of keeping track of the retry attempts, we remove the first element from the delays
        // array. If the array is empty, all retry attempts are used up and we will bubble up the error.
        // We recursively call the terminate function will removing elements from the retryDelays array.
        var delay = options.retryDelays[0];
        var remainingDelays = options.retryDelays.slice(1);
        var newOptions = _objectSpread(_objectSpread({}, options), {}, {
          retryDelays: remainingDelays
        });
        return new Promise(function (resolve) {
          return setTimeout(resolve, delay);
        }).then(function () {
          return BaseUpload.terminate(url, newOptions);
        });
      });
    }
  }]);
}();
function encodeMetadata(metadata) {
  return Object.entries(metadata).map(function (_ref3) {
    var _ref4 = _slicedToArray(_ref3, 2),
      key = _ref4[0],
      value = _ref4[1];
    return "".concat(key, " ").concat(_jsBase.Base64.encode(String(value)));
  }).join(',');
}

/**
 * Checks whether a given status is in the range of the expected category.
 * For example, only a status between 200 and 299 will satisfy the category 200.
 *
 * @api private
 */
function inStatusCategory(status, category) {
  return status >= category && status < category + 100;
}

/**
 * Create a new HTTP request with the specified method and URL.
 * The necessary headers that are included in every request
 * will be added, including the request ID.
 *
 * @api private
 */
function openRequest(method, url, options) {
  var req = options.httpStack.createRequest(method, url);
  if (options.protocol === PROTOCOL_IETF_DRAFT_03) {
    req.setHeader('Upload-Draft-Interop-Version', '5');
  } else if (options.protocol === PROTOCOL_IETF_DRAFT_05) {
    req.setHeader('Upload-Draft-Interop-Version', '6');
  } else {
    req.setHeader('Tus-Resumable', '1.0.0');
  }
  var headers = options.headers || {};
  for (var _i2 = 0, _Object$entries = Object.entries(headers); _i2 < _Object$entries.length; _i2++) {
    var _Object$entries$_i = _slicedToArray(_Object$entries[_i2], 2),
      name = _Object$entries$_i[0],
      value = _Object$entries$_i[1];
    req.setHeader(name, value);
  }
  if (options.addRequestId) {
    var requestId = (0, _uuid["default"])();
    req.setHeader('X-Request-ID', requestId);
  }
  return req;
}

/**
 * Send a request with the provided body while invoking the onBeforeRequest
 * and onAfterResponse callbacks.
 *
 * @api private
 */
function sendRequest(_x, _x2, _x3) {
  return _sendRequest2.apply(this, arguments);
}
/**
 * Checks whether the browser running this code has internet access.
 * This function will always return true in the node.js environment
 *
 * @api private
 */
function _sendRequest2() {
  _sendRequest2 = _asyncToGenerator( /*#__PURE__*/_regeneratorRuntime().mark(function _callee(req, body, options) {
    var res;
    return _regeneratorRuntime().wrap(function _callee$(_context) {
      while (1) switch (_context.prev = _context.next) {
        case 0:
          if (!(typeof options.onBeforeRequest === 'function')) {
            _context.next = 3;
            break;
          }
          _context.next = 3;
          return options.onBeforeRequest(req);
        case 3:
          _context.next = 5;
          return req.send(body);
        case 5:
          res = _context.sent;
          if (!(typeof options.onAfterResponse === 'function')) {
            _context.next = 9;
            break;
          }
          _context.next = 9;
          return options.onAfterResponse(req, res);
        case 9:
          return _context.abrupt("return", res);
        case 10:
        case "end":
          return _context.stop();
      }
    }, _callee);
  }));
  return _sendRequest2.apply(this, arguments);
}
function isOnline() {
  var online = true;
  // Note: We don't reference `window` here because the navigator object also exists
  // in a Web Worker's context.
  if (typeof navigator !== 'undefined' && navigator.onLine === false) {
    online = false;
  }
  return online;
}

/**
 * Checks whether or not it is ok to retry a request.
 * @param {Error|DetailedError} err the error returned from the last request
 * @param {number} retryAttempt the number of times the request has already been retried
 * @param {object} options tus Upload options
 *
 * @api private
 */
function shouldRetry(err, retryAttempt, options) {
  // We only attempt a retry if
  // - retryDelays option is set
  // - we didn't exceed the maxium number of retries, yet, and
  // - this error was caused by a request or it's response and
  // - the error is server error (i.e. not a status 4xx except a 409 or 423) or
  // a onShouldRetry is specified and returns true
  // - the browser does not indicate that we are offline
  if (options.retryDelays == null || retryAttempt >= options.retryDelays.length || err.originalRequest == null) {
    return false;
  }
  if (options && typeof options.onShouldRetry === 'function') {
    return options.onShouldRetry(err, retryAttempt, options);
  }
  return defaultOnShouldRetry(err);
}

/**
 * determines if the request should be retried. Will only retry if not a status 4xx except a 409 or 423
 * @param {DetailedError} err
 * @returns {boolean}
 */
function defaultOnShouldRetry(err) {
  var status = err.originalResponse ? err.originalResponse.getStatus() : 0;
  return (!inStatusCategory(status, 400) || status === 409 || status === 423) && isOnline();
}

/**
 * Resolve a relative link given the origin as source. For example,
 * if a HTTP request to http://example.com/files/ returns a Location
 * header with the value /upload/abc, the resolved URL will be:
 * http://example.com/upload/abc
 */
function resolveUrl(origin, link) {
  return new _urlParse["default"](link, origin).toString();
}

/**
 * Calculate the start and end positions for the parts if an upload
 * is split into multiple parallel requests.
 *
 * @param {number} totalSize The byte size of the upload, which will be split.
 * @param {number} partCount The number in how many parts the upload will be split.
 * @return {object[]}
 * @api private
 */
function splitSizeIntoParts(totalSize, partCount) {
  var partSize = Math.floor(totalSize / partCount);
  var parts = [];
  for (var i = 0; i < partCount; i++) {
    parts.push({
      start: partSize * i,
      end: partSize * (i + 1)
    });
  }
  parts[partCount - 1].end = totalSize;
  return parts;
}
BaseUpload.defaultOptions = defaultOptions;
var _default = exports["default"] = BaseUpload;

},{"./error.js":12,"./logger.js":13,"./uuid.js":16,"js-base64":20,"url-parse":23}],16:[function(require,module,exports){
"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = uuid;
/**
 * Generate a UUID v4 based on random numbers. We intentioanlly use the less
 * secure Math.random function here since the more secure crypto.getRandomNumbers
 * is not available on all platforms.
 * This is not a problem for us since we use the UUID only for generating a
 * request ID, so we can correlate server logs to client errors.
 *
 * This function is taken from following site:
 * https://stackoverflow.com/questions/105034/create-guid-uuid-in-javascript
 *
 * @return {string} The generate UUID
 */
function uuid() {
  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
    var r = Math.random() * 16 | 0;
    var v = c === 'x' ? r : r & 0x3 | 0x8;
    return v.toString(16);
  });
}

},{}],17:[function(require,module,exports){
'use strict'

exports.byteLength = byteLength
exports.toByteArray = toByteArray
exports.fromByteArray = fromByteArray

var lookup = []
var revLookup = []
var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array

var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
for (var i = 0, len = code.length; i < len; ++i) {
  lookup[i] = code[i]
  revLookup[code.charCodeAt(i)] = i
}

// Support decoding URL-safe base64 strings, as Node.js does.
// See: https://en.wikipedia.org/wiki/Base64#URL_applications
revLookup['-'.charCodeAt(0)] = 62
revLookup['_'.charCodeAt(0)] = 63

function getLens (b64) {
  var len = b64.length

  if (len % 4 > 0) {
    throw new Error('Invalid string. Length must be a multiple of 4')
  }

  // Trim off extra bytes after placeholder bytes are found
  // See: https://github.com/beatgammit/base64-js/issues/42
  var validLen = b64.indexOf('=')
  if (validLen === -1) validLen = len

  var placeHoldersLen = validLen === len
    ? 0
    : 4 - (validLen % 4)

  return [validLen, placeHoldersLen]
}

// base64 is 4/3 + up to two characters of the original data
function byteLength (b64) {
  var lens = getLens(b64)
  var validLen = lens[0]
  var placeHoldersLen = lens[1]
  return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen
}

function _byteLength (b64, validLen, placeHoldersLen) {
  return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen
}

function toByteArray (b64) {
  var tmp
  var lens = getLens(b64)
  var validLen = lens[0]
  var placeHoldersLen = lens[1]

  var arr = new Arr(_byteLength(b64, validLen, placeHoldersLen))

  var curByte = 0

  // if there are placeholders, only get up to the last complete 4 chars
  var len = placeHoldersLen > 0
    ? validLen - 4
    : validLen

  var i
  for (i = 0; i < len; i += 4) {
    tmp =
      (revLookup[b64.charCodeAt(i)] << 18) |
      (revLookup[b64.charCodeAt(i + 1)] << 12) |
      (revLookup[b64.charCodeAt(i + 2)] << 6) |
      revLookup[b64.charCodeAt(i + 3)]
    arr[curByte++] = (tmp >> 16) & 0xFF
    arr[curByte++] = (tmp >> 8) & 0xFF
    arr[curByte++] = tmp & 0xFF
  }

  if (placeHoldersLen === 2) {
    tmp =
      (revLookup[b64.charCodeAt(i)] << 2) |
      (revLookup[b64.charCodeAt(i + 1)] >> 4)
    arr[curByte++] = tmp & 0xFF
  }

  if (placeHoldersLen === 1) {
    tmp =
      (revLookup[b64.charCodeAt(i)] << 10) |
      (revLookup[b64.charCodeAt(i + 1)] << 4) |
      (revLookup[b64.charCodeAt(i + 2)] >> 2)
    arr[curByte++] = (tmp >> 8) & 0xFF
    arr[curByte++] = tmp & 0xFF
  }

  return arr
}

function tripletToBase64 (num) {
  return lookup[num >> 18 & 0x3F] +
    lookup[num >> 12 & 0x3F] +
    lookup[num >> 6 & 0x3F] +
    lookup[num & 0x3F]
}

function encodeChunk (uint8, start, end) {
  var tmp
  var output = []
  for (var i = start; i < end; i += 3) {
    tmp =
      ((uint8[i] << 16) & 0xFF0000) +
      ((uint8[i + 1] << 8) & 0xFF00) +
      (uint8[i + 2] & 0xFF)
    output.push(tripletToBase64(tmp))
  }
  return output.join('')
}

function fromByteArray (uint8) {
  var tmp
  var len = uint8.length
  var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes
  var parts = []
  var maxChunkLength = 16383 // must be multiple of 3

  // go through the array every three bytes, we'll deal with trailing stuff later
  for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
    parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)))
  }

  // pad the end with zeros, but make sure to not forget the extra bytes
  if (extraBytes === 1) {
    tmp = uint8[len - 1]
    parts.push(
      lookup[tmp >> 2] +
      lookup[(tmp << 4) & 0x3F] +
      '=='
    )
  } else if (extraBytes === 2) {
    tmp = (uint8[len - 2] << 8) + uint8[len - 1]
    parts.push(
      lookup[tmp >> 10] +
      lookup[(tmp >> 4) & 0x3F] +
      lookup[(tmp << 2) & 0x3F] +
      '='
    )
  }

  return parts.join('')
}

},{}],18:[function(require,module,exports){
(function (Buffer){(function (){
/*!
 * The buffer module from node.js, for the browser.
 *
 * @author   Feross Aboukhadijeh <https://feross.org>
 * @license  MIT
 */
/* eslint-disable no-proto */

'use strict'

var base64 = require('base64-js')
var ieee754 = require('ieee754')

exports.Buffer = Buffer
exports.SlowBuffer = SlowBuffer
exports.INSPECT_MAX_BYTES = 50

var K_MAX_LENGTH = 0x7fffffff
exports.kMaxLength = K_MAX_LENGTH

/**
 * If `Buffer.TYPED_ARRAY_SUPPORT`:
 *   === true    Use Uint8Array implementation (fastest)
 *   === false   Print warning and recommend using `buffer` v4.x which has an Object
 *               implementation (most compatible, even IE6)
 *
 * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
 * Opera 11.6+, iOS 4.2+.
 *
 * We report that the browser does not support typed arrays if the are not subclassable
 * using __proto__. Firefox 4-29 lacks support for adding new properties to `Uint8Array`
 * (See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438). IE 10 lacks support
 * for __proto__ and has a buggy typed array implementation.
 */
Buffer.TYPED_ARRAY_SUPPORT = typedArraySupport()

if (!Buffer.TYPED_ARRAY_SUPPORT && typeof console !== 'undefined' &&
    typeof console.error === 'function') {
  console.error(
    'This browser lacks typed array (Uint8Array) support which is required by ' +
    '`buffer` v5.x. Use `buffer` v4.x if you require old browser support.'
  )
}

function typedArraySupport () {
  // Can typed array instances can be augmented?
  try {
    var arr = new Uint8Array(1)
    arr.__proto__ = { __proto__: Uint8Array.prototype, foo: function () { return 42 } }
    return arr.foo() === 42
  } catch (e) {
    return false
  }
}

Object.defineProperty(Buffer.prototype, 'parent', {
  enumerable: true,
  get: function () {
    if (!Buffer.isBuffer(this)) return undefined
    return this.buffer
  }
})

Object.defineProperty(Buffer.prototype, 'offset', {
  enumerable: true,
  get: function () {
    if (!Buffer.isBuffer(this)) return undefined
    return this.byteOffset
  }
})

function createBuffer (length) {
  if (length > K_MAX_LENGTH) {
    throw new RangeError('The value "' + length + '" is invalid for option "size"')
  }
  // Return an augmented `Uint8Array` instance
  var buf = new Uint8Array(length)
  buf.__proto__ = Buffer.prototype
  return buf
}

/**
 * The Buffer constructor returns instances of `Uint8Array` that have their
 * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of
 * `Uint8Array`, so the returned instances will have all the node `Buffer` methods
 * and the `Uint8Array` methods. Square bracket notation works as expected -- it
 * returns a single octet.
 *
 * The `Uint8Array` prototype remains unmodified.
 */

function Buffer (arg, encodingOrOffset, length) {
  // Common case.
  if (typeof arg === 'number') {
    if (typeof encodingOrOffset === 'string') {
      throw new TypeError(
        'The "string" argument must be of type string. Received type number'
      )
    }
    return allocUnsafe(arg)
  }
  return from(arg, encodingOrOffset, length)
}

// Fix subarray() in ES2016. See: https://github.com/feross/buffer/pull/97
if (typeof Symbol !== 'undefined' && Symbol.species != null &&
    Buffer[Symbol.species] === Buffer) {
  Object.defineProperty(Buffer, Symbol.species, {
    value: null,
    configurable: true,
    enumerable: false,
    writable: false
  })
}

Buffer.poolSize = 8192 // not used by this implementation

function from (value, encodingOrOffset, length) {
  if (typeof value === 'string') {
    return fromString(value, encodingOrOffset)
  }

  if (ArrayBuffer.isView(value)) {
    return fromArrayLike(value)
  }

  if (value == null) {
    throw TypeError(
      'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
      'or Array-like Object. Received type ' + (typeof value)
    )
  }

  if (isInstance(value, ArrayBuffer) ||
      (value && isInstance(value.buffer, ArrayBuffer))) {
    return fromArrayBuffer(value, encodingOrOffset, length)
  }

  if (typeof value === 'number') {
    throw new TypeError(
      'The "value" argument must not be of type number. Received type number'
    )
  }

  var valueOf = value.valueOf && value.valueOf()
  if (valueOf != null && valueOf !== value) {
    return Buffer.from(valueOf, encodingOrOffset, length)
  }

  var b = fromObject(value)
  if (b) return b

  if (typeof Symbol !== 'undefined' && Symbol.toPrimitive != null &&
      typeof value[Symbol.toPrimitive] === 'function') {
    return Buffer.from(
      value[Symbol.toPrimitive]('string'), encodingOrOffset, length
    )
  }

  throw new TypeError(
    'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
    'or Array-like Object. Received type ' + (typeof value)
  )
}

/**
 * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
 * if value is a number.
 * Buffer.from(str[, encoding])
 * Buffer.from(array)
 * Buffer.from(buffer)
 * Buffer.from(arrayBuffer[, byteOffset[, length]])
 **/
Buffer.from = function (value, encodingOrOffset, length) {
  return from(value, encodingOrOffset, length)
}

// Note: Change prototype *after* Buffer.from is defined to workaround Chrome bug:
// https://github.com/feross/buffer/pull/148
Buffer.prototype.__proto__ = Uint8Array.prototype
Buffer.__proto__ = Uint8Array

function assertSize (size) {
  if (typeof size !== 'number') {
    throw new TypeError('"size" argument must be of type number')
  } else if (size < 0) {
    throw new RangeError('The value "' + size + '" is invalid for option "size"')
  }
}

function alloc (size, fill, encoding) {
  assertSize(size)
  if (size <= 0) {
    return createBuffer(size)
  }
  if (fill !== undefined) {
    // Only pay attention to encoding if it's a string. This
    // prevents accidentally sending in a number that would
    // be interpretted as a start offset.
    return typeof encoding === 'string'
      ? createBuffer(size).fill(fill, encoding)
      : createBuffer(size).fill(fill)
  }
  return createBuffer(size)
}

/**
 * Creates a new filled Buffer instance.
 * alloc(size[, fill[, encoding]])
 **/
Buffer.alloc = function (size, fill, encoding) {
  return alloc(size, fill, encoding)
}

function allocUnsafe (size) {
  assertSize(size)
  return createBuffer(size < 0 ? 0 : checked(size) | 0)
}

/**
 * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
 * */
Buffer.allocUnsafe = function (size) {
  return allocUnsafe(size)
}
/**
 * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
 */
Buffer.allocUnsafeSlow = function (size) {
  return allocUnsafe(size)
}

function fromString (string, encoding) {
  if (typeof encoding !== 'string' || encoding === '') {
    encoding = 'utf8'
  }

  if (!Buffer.isEncoding(encoding)) {
    throw new TypeError('Unknown encoding: ' + encoding)
  }

  var length = byteLength(string, encoding) | 0
  var buf = createBuffer(length)

  var actual = buf.write(string, encoding)

  if (actual !== length) {
    // Writing a hex string, for example, that contains invalid characters will
    // cause everything after the first invalid character to be ignored. (e.g.
    // 'abxxcd' will be treated as 'ab')
    buf = buf.slice(0, actual)
  }

  return buf
}

function fromArrayLike (array) {
  var length = array.length < 0 ? 0 : checked(array.length) | 0
  var buf = createBuffer(length)
  for (var i = 0; i < length; i += 1) {
    buf[i] = array[i] & 255
  }
  return buf
}

function fromArrayBuffer (array, byteOffset, length) {
  if (byteOffset < 0 || array.byteLength < byteOffset) {
    throw new RangeError('"offset" is outside of buffer bounds')
  }

  if (array.byteLength < byteOffset + (length || 0)) {
    throw new RangeError('"length" is outside of buffer bounds')
  }

  var buf
  if (byteOffset === undefined && length === undefined) {
    buf = new Uint8Array(array)
  } else if (length === undefined) {
    buf = new Uint8Array(array, byteOffset)
  } else {
    buf = new Uint8Array(array, byteOffset, length)
  }

  // Return an augmented `Uint8Array` instance
  buf.__proto__ = Buffer.prototype
  return buf
}

function fromObject (obj) {
  if (Buffer.isBuffer(obj)) {
    var len = checked(obj.length) | 0
    var buf = createBuffer(len)

    if (buf.length === 0) {
      return buf
    }

    obj.copy(buf, 0, 0, len)
    return buf
  }

  if (obj.length !== undefined) {
    if (typeof obj.length !== 'number' || numberIsNaN(obj.length)) {
      return createBuffer(0)
    }
    return fromArrayLike(obj)
  }

  if (obj.type === 'Buffer' && Array.isArray(obj.data)) {
    return fromArrayLike(obj.data)
  }
}

function checked (length) {
  // Note: cannot use `length < K_MAX_LENGTH` here because that fails when
  // length is NaN (which is otherwise coerced to zero.)
  if (length >= K_MAX_LENGTH) {
    throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
                         'size: 0x' + K_MAX_LENGTH.toString(16) + ' bytes')
  }
  return length | 0
}

function SlowBuffer (length) {
  if (+length != length) { // eslint-disable-line eqeqeq
    length = 0
  }
  return Buffer.alloc(+length)
}

Buffer.isBuffer = function isBuffer (b) {
  return b != null && b._isBuffer === true &&
    b !== Buffer.prototype // so Buffer.isBuffer(Buffer.prototype) will be false
}

Buffer.compare = function compare (a, b) {
  if (isInstance(a, Uint8Array)) a = Buffer.from(a, a.offset, a.byteLength)
  if (isInstance(b, Uint8Array)) b = Buffer.from(b, b.offset, b.byteLength)
  if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
    throw new TypeError(
      'The "buf1", "buf2" arguments must be one of type Buffer or Uint8Array'
    )
  }

  if (a === b) return 0

  var x = a.length
  var y = b.length

  for (var i = 0, len = Math.min(x, y); i < len; ++i) {
    if (a[i] !== b[i]) {
      x = a[i]
      y = b[i]
      break
    }
  }

  if (x < y) return -1
  if (y < x) return 1
  return 0
}

Buffer.isEncoding = function isEncoding (encoding) {
  switch (String(encoding).toLowerCase()) {
    case 'hex':
    case 'utf8':
    case 'utf-8':
    case 'ascii':
    case 'latin1':
    case 'binary':
    case 'base64':
    case 'ucs2':
    case 'ucs-2':
    case 'utf16le':
    case 'utf-16le':
      return true
    default:
      return false
  }
}

Buffer.concat = function concat (list, length) {
  if (!Array.isArray(list)) {
    throw new TypeError('"list" argument must be an Array of Buffers')
  }

  if (list.length === 0) {
    return Buffer.alloc(0)
  }

  var i
  if (length === undefined) {
    length = 0
    for (i = 0; i < list.length; ++i) {
      length += list[i].length
    }
  }

  var buffer = Buffer.allocUnsafe(length)
  var pos = 0
  for (i = 0; i < list.length; ++i) {
    var buf = list[i]
    if (isInstance(buf, Uint8Array)) {
      buf = Buffer.from(buf)
    }
    if (!Buffer.isBuffer(buf)) {
      throw new TypeError('"list" argument must be an Array of Buffers')
    }
    buf.copy(buffer, pos)
    pos += buf.length
  }
  return buffer
}

function byteLength (string, encoding) {
  if (Buffer.isBuffer(string)) {
    return string.length
  }
  if (ArrayBuffer.isView(string) || isInstance(string, ArrayBuffer)) {
    return string.byteLength
  }
  if (typeof string !== 'string') {
    throw new TypeError(
      'The "string" argument must be one of type string, Buffer, or ArrayBuffer. ' +
      'Received type ' + typeof string
    )
  }

  var len = string.length
  var mustMatch = (arguments.length > 2 && arguments[2] === true)
  if (!mustMatch && len === 0) return 0

  // Use a for loop to avoid recursion
  var loweredCase = false
  for (;;) {
    switch (encoding) {
      case 'ascii':
      case 'latin1':
      case 'binary':
        return len
      case 'utf8':
      case 'utf-8':
        return utf8ToBytes(string).length
      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return len * 2
      case 'hex':
        return len >>> 1
      case 'base64':
        return base64ToBytes(string).length
      default:
        if (loweredCase) {
          return mustMatch ? -1 : utf8ToBytes(string).length // assume utf8
        }
        encoding = ('' + encoding).toLowerCase()
        loweredCase = true
    }
  }
}
Buffer.byteLength = byteLength

function slowToString (encoding, start, end) {
  var loweredCase = false

  // No need to verify that "this.length <= MAX_UINT32" since it's a read-only
  // property of a typed array.

  // This behaves neither like String nor Uint8Array in that we set start/end
  // to their upper/lower bounds if the value passed is out of range.
  // undefined is handled specially as per ECMA-262 6th Edition,
  // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
  if (start === undefined || start < 0) {
    start = 0
  }
  // Return early if start > this.length. Done here to prevent potential uint32
  // coercion fail below.
  if (start > this.length) {
    return ''
  }

  if (end === undefined || end > this.length) {
    end = this.length
  }

  if (end <= 0) {
    return ''
  }

  // Force coersion to uint32. This will also coerce falsey/NaN values to 0.
  end >>>= 0
  start >>>= 0

  if (end <= start) {
    return ''
  }

  if (!encoding) encoding = 'utf8'

  while (true) {
    switch (encoding) {
      case 'hex':
        return hexSlice(this, start, end)

      case 'utf8':
      case 'utf-8':
        return utf8Slice(this, start, end)

      case 'ascii':
        return asciiSlice(this, start, end)

      case 'latin1':
      case 'binary':
        return latin1Slice(this, start, end)

      case 'base64':
        return base64Slice(this, start, end)

      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return utf16leSlice(this, start, end)

      default:
        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
        encoding = (encoding + '').toLowerCase()
        loweredCase = true
    }
  }
}

// This property is used by `Buffer.isBuffer` (and the `is-buffer` npm package)
// to detect a Buffer instance. It's not possible to use `instanceof Buffer`
// reliably in a browserify context because there could be multiple different
// copies of the 'buffer' package in use. This method works even for Buffer
// instances that were created from another copy of the `buffer` package.
// See: https://github.com/feross/buffer/issues/154
Buffer.prototype._isBuffer = true

function swap (b, n, m) {
  var i = b[n]
  b[n] = b[m]
  b[m] = i
}

Buffer.prototype.swap16 = function swap16 () {
  var len = this.length
  if (len % 2 !== 0) {
    throw new RangeError('Buffer size must be a multiple of 16-bits')
  }
  for (var i = 0; i < len; i += 2) {
    swap(this, i, i + 1)
  }
  return this
}

Buffer.prototype.swap32 = function swap32 () {
  var len = this.length
  if (len % 4 !== 0) {
    throw new RangeError('Buffer size must be a multiple of 32-bits')
  }
  for (var i = 0; i < len; i += 4) {
    swap(this, i, i + 3)
    swap(this, i + 1, i + 2)
  }
  return this
}

Buffer.prototype.swap64 = function swap64 () {
  var len = this.length
  if (len % 8 !== 0) {
    throw new RangeError('Buffer size must be a multiple of 64-bits')
  }
  for (var i = 0; i < len; i += 8) {
    swap(this, i, i + 7)
    swap(this, i + 1, i + 6)
    swap(this, i + 2, i + 5)
    swap(this, i + 3, i + 4)
  }
  return this
}

Buffer.prototype.toString = function toString () {
  var length = this.length
  if (length === 0) return ''
  if (arguments.length === 0) return utf8Slice(this, 0, length)
  return slowToString.apply(this, arguments)
}

Buffer.prototype.toLocaleString = Buffer.prototype.toString

Buffer.prototype.equals = function equals (b) {
  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
  if (this === b) return true
  return Buffer.compare(this, b) === 0
}

Buffer.prototype.inspect = function inspect () {
  var str = ''
  var max = exports.INSPECT_MAX_BYTES
  str = this.toString('hex', 0, max).replace(/(.{2})/g, '$1 ').trim()
  if (this.length > max) str += ' ... '
  return '<Buffer ' + str + '>'
}

Buffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {
  if (isInstance(target, Uint8Array)) {
    target = Buffer.from(target, target.offset, target.byteLength)
  }
  if (!Buffer.isBuffer(target)) {
    throw new TypeError(
      'The "target" argument must be one of type Buffer or Uint8Array. ' +
      'Received type ' + (typeof target)
    )
  }

  if (start === undefined) {
    start = 0
  }
  if (end === undefined) {
    end = target ? target.length : 0
  }
  if (thisStart === undefined) {
    thisStart = 0
  }
  if (thisEnd === undefined) {
    thisEnd = this.length
  }

  if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {
    throw new RangeError('out of range index')
  }

  if (thisStart >= thisEnd && start >= end) {
    return 0
  }
  if (thisStart >= thisEnd) {
    return -1
  }
  if (start >= end) {
    return 1
  }

  start >>>= 0
  end >>>= 0
  thisStart >>>= 0
  thisEnd >>>= 0

  if (this === target) return 0

  var x = thisEnd - thisStart
  var y = end - start
  var len = Math.min(x, y)

  var thisCopy = this.slice(thisStart, thisEnd)
  var targetCopy = target.slice(start, end)

  for (var i = 0; i < len; ++i) {
    if (thisCopy[i] !== targetCopy[i]) {
      x = thisCopy[i]
      y = targetCopy[i]
      break
    }
  }

  if (x < y) return -1
  if (y < x) return 1
  return 0
}

// Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,
// OR the last index of `val` in `buffer` at offset <= `byteOffset`.
//
// Arguments:
// - buffer - a Buffer to search
// - val - a string, Buffer, or number
// - byteOffset - an index into `buffer`; will be clamped to an int32
// - encoding - an optional encoding, relevant is val is a string
// - dir - true for indexOf, false for lastIndexOf
function bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {
  // Empty buffer means no match
  if (buffer.length === 0) return -1

  // Normalize byteOffset
  if (typeof byteOffset === 'string') {
    encoding = byteOffset
    byteOffset = 0
  } else if (byteOffset > 0x7fffffff) {
    byteOffset = 0x7fffffff
  } else if (byteOffset < -0x80000000) {
    byteOffset = -0x80000000
  }
  byteOffset = +byteOffset // Coerce to Number.
  if (numberIsNaN(byteOffset)) {
    // byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer
    byteOffset = dir ? 0 : (buffer.length - 1)
  }

  // Normalize byteOffset: negative offsets start from the end of the buffer
  if (byteOffset < 0) byteOffset = buffer.length + byteOffset
  if (byteOffset >= buffer.length) {
    if (dir) return -1
    else byteOffset = buffer.length - 1
  } else if (byteOffset < 0) {
    if (dir) byteOffset = 0
    else return -1
  }

  // Normalize val
  if (typeof val === 'string') {
    val = Buffer.from(val, encoding)
  }

  // Finally, search either indexOf (if dir is true) or lastIndexOf
  if (Buffer.isBuffer(val)) {
    // Special case: looking for empty string/buffer always fails
    if (val.length === 0) {
      return -1
    }
    return arrayIndexOf(buffer, val, byteOffset, encoding, dir)
  } else if (typeof val === 'number') {
    val = val & 0xFF // Search for a byte value [0-255]
    if (typeof Uint8Array.prototype.indexOf === 'function') {
      if (dir) {
        return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)
      } else {
        return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)
      }
    }
    return arrayIndexOf(buffer, [ val ], byteOffset, encoding, dir)
  }

  throw new TypeError('val must be string, number or Buffer')
}

function arrayIndexOf (arr, val, byteOffset, encoding, dir) {
  var indexSize = 1
  var arrLength = arr.length
  var valLength = val.length

  if (encoding !== undefined) {
    encoding = String(encoding).toLowerCase()
    if (encoding === 'ucs2' || encoding === 'ucs-2' ||
        encoding === 'utf16le' || encoding === 'utf-16le') {
      if (arr.length < 2 || val.length < 2) {
        return -1
      }
      indexSize = 2
      arrLength /= 2
      valLength /= 2
      byteOffset /= 2
    }
  }

  function read (buf, i) {
    if (indexSize === 1) {
      return buf[i]
    } else {
      return buf.readUInt16BE(i * indexSize)
    }
  }

  var i
  if (dir) {
    var foundIndex = -1
    for (i = byteOffset; i < arrLength; i++) {
      if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {
        if (foundIndex === -1) foundIndex = i
        if (i - foundIndex + 1 === valLength) return foundIndex * indexSize
      } else {
        if (foundIndex !== -1) i -= i - foundIndex
        foundIndex = -1
      }
    }
  } else {
    if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength
    for (i = byteOffset; i >= 0; i--) {
      var found = true
      for (var j = 0; j < valLength; j++) {
        if (read(arr, i + j) !== read(val, j)) {
          found = false
          break
        }
      }
      if (found) return i
    }
  }

  return -1
}

Buffer.prototype.includes = function includes (val, byteOffset, encoding) {
  return this.indexOf(val, byteOffset, encoding) !== -1
}

Buffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {
  return bidirectionalIndexOf(this, val, byteOffset, encoding, true)
}

Buffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {
  return bidirectionalIndexOf(this, val, byteOffset, encoding, false)
}

function hexWrite (buf, string, offset, length) {
  offset = Number(offset) || 0
  var remaining = buf.length - offset
  if (!length) {
    length = remaining
  } else {
    length = Number(length)
    if (length > remaining) {
      length = remaining
    }
  }

  var strLen = string.length

  if (length > strLen / 2) {
    length = strLen / 2
  }
  for (var i = 0; i < length; ++i) {
    var parsed = parseInt(string.substr(i * 2, 2), 16)
    if (numberIsNaN(parsed)) return i
    buf[offset + i] = parsed
  }
  return i
}

function utf8Write (buf, string, offset, length) {
  return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
}

function asciiWrite (buf, string, offset, length) {
  return blitBuffer(asciiToBytes(string), buf, offset, length)
}

function latin1Write (buf, string, offset, length) {
  return asciiWrite(buf, string, offset, length)
}

function base64Write (buf, string, offset, length) {
  return blitBuffer(base64ToBytes(string), buf, offset, length)
}

function ucs2Write (buf, string, offset, length) {
  return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
}

Buffer.prototype.write = function write (string, offset, length, encoding) {
  // Buffer#write(string)
  if (offset === undefined) {
    encoding = 'utf8'
    length = this.length
    offset = 0
  // Buffer#write(string, encoding)
  } else if (length === undefined && typeof offset === 'string') {
    encoding = offset
    length = this.length
    offset = 0
  // Buffer#write(string, offset[, length][, encoding])
  } else if (isFinite(offset)) {
    offset = offset >>> 0
    if (isFinite(length)) {
      length = length >>> 0
      if (encoding === undefined) encoding = 'utf8'
    } else {
      encoding = length
      length = undefined
    }
  } else {
    throw new Error(
      'Buffer.write(string, encoding, offset[, length]) is no longer supported'
    )
  }

  var remaining = this.length - offset
  if (length === undefined || length > remaining) length = remaining

  if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
    throw new RangeError('Attempt to write outside buffer bounds')
  }

  if (!encoding) encoding = 'utf8'

  var loweredCase = false
  for (;;) {
    switch (encoding) {
      case 'hex':
        return hexWrite(this, string, offset, length)

      case 'utf8':
      case 'utf-8':
        return utf8Write(this, string, offset, length)

      case 'ascii':
        return asciiWrite(this, string, offset, length)

      case 'latin1':
      case 'binary':
        return latin1Write(this, string, offset, length)

      case 'base64':
        // Warning: maxLength not taken into account in base64Write
        return base64Write(this, string, offset, length)

      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return ucs2Write(this, string, offset, length)

      default:
        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
        encoding = ('' + encoding).toLowerCase()
        loweredCase = true
    }
  }
}

Buffer.prototype.toJSON = function toJSON () {
  return {
    type: 'Buffer',
    data: Array.prototype.slice.call(this._arr || this, 0)
  }
}

function base64Slice (buf, start, end) {
  if (start === 0 && end === buf.length) {
    return base64.fromByteArray(buf)
  } else {
    return base64.fromByteArray(buf.slice(start, end))
  }
}

function utf8Slice (buf, start, end) {
  end = Math.min(buf.length, end)
  var res = []

  var i = start
  while (i < end) {
    var firstByte = buf[i]
    var codePoint = null
    var bytesPerSequence = (firstByte > 0xEF) ? 4
      : (firstByte > 0xDF) ? 3
        : (firstByte > 0xBF) ? 2
          : 1

    if (i + bytesPerSequence <= end) {
      var secondByte, thirdByte, fourthByte, tempCodePoint

      switch (bytesPerSequence) {
        case 1:
          if (firstByte < 0x80) {
            codePoint = firstByte
          }
          break
        case 2:
          secondByte = buf[i + 1]
          if ((secondByte & 0xC0) === 0x80) {
            tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
            if (tempCodePoint > 0x7F) {
              codePoint = tempCodePoint
            }
          }
          break
        case 3:
          secondByte = buf[i + 1]
          thirdByte = buf[i + 2]
          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
            tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
            if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
              codePoint = tempCodePoint
            }
          }
          break
        case 4:
          secondByte = buf[i + 1]
          thirdByte = buf[i + 2]
          fourthByte = buf[i + 3]
          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
            tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
            if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
              codePoint = tempCodePoint
            }
          }
      }
    }

    if (codePoint === null) {
      // we did not generate a valid codePoint so insert a
      // replacement char (U+FFFD) and advance only 1 byte
      codePoint = 0xFFFD
      bytesPerSequence = 1
    } else if (codePoint > 0xFFFF) {
      // encode to utf16 (surrogate pair dance)
      codePoint -= 0x10000
      res.push(codePoint >>> 10 & 0x3FF | 0xD800)
      codePoint = 0xDC00 | codePoint & 0x3FF
    }

    res.push(codePoint)
    i += bytesPerSequence
  }

  return decodeCodePointsArray(res)
}

// Based on http://stackoverflow.com/a/22747272/680742, the browser with
// the lowest limit is Chrome, with 0x10000 args.
// We go 1 magnitude less, for safety
var MAX_ARGUMENTS_LENGTH = 0x1000

function decodeCodePointsArray (codePoints) {
  var len = codePoints.length
  if (len <= MAX_ARGUMENTS_LENGTH) {
    return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
  }

  // Decode in chunks to avoid "call stack size exceeded".
  var res = ''
  var i = 0
  while (i < len) {
    res += String.fromCharCode.apply(
      String,
      codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
    )
  }
  return res
}

function asciiSlice (buf, start, end) {
  var ret = ''
  end = Math.min(buf.length, end)

  for (var i = start; i < end; ++i) {
    ret += String.fromCharCode(buf[i] & 0x7F)
  }
  return ret
}

function latin1Slice (buf, start, end) {
  var ret = ''
  end = Math.min(buf.length, end)

  for (var i = start; i < end; ++i) {
    ret += String.fromCharCode(buf[i])
  }
  return ret
}

function hexSlice (buf, start, end) {
  var len = buf.length

  if (!start || start < 0) start = 0
  if (!end || end < 0 || end > len) end = len

  var out = ''
  for (var i = start; i < end; ++i) {
    out += toHex(buf[i])
  }
  return out
}

function utf16leSlice (buf, start, end) {
  var bytes = buf.slice(start, end)
  var res = ''
  for (var i = 0; i < bytes.length; i += 2) {
    res += String.fromCharCode(bytes[i] + (bytes[i + 1] * 256))
  }
  return res
}

Buffer.prototype.slice = function slice (start, end) {
  var len = this.length
  start = ~~start
  end = end === undefined ? len : ~~end

  if (start < 0) {
    start += len
    if (start < 0) start = 0
  } else if (start > len) {
    start = len
  }

  if (end < 0) {
    end += len
    if (end < 0) end = 0
  } else if (end > len) {
    end = len
  }

  if (end < start) end = start

  var newBuf = this.subarray(start, end)
  // Return an augmented `Uint8Array` instance
  newBuf.__proto__ = Buffer.prototype
  return newBuf
}

/*
 * Need to make sure that buffer isn't trying to write out of bounds.
 */
function checkOffset (offset, ext, length) {
  if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
  if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
}

Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {
  offset = offset >>> 0
  byteLength = byteLength >>> 0
  if (!noAssert) checkOffset(offset, byteLength, this.length)

  var val = this[offset]
  var mul = 1
  var i = 0
  while (++i < byteLength && (mul *= 0x100)) {
    val += this[offset + i] * mul
  }

  return val
}

Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {
  offset = offset >>> 0
  byteLength = byteLength >>> 0
  if (!noAssert) {
    checkOffset(offset, byteLength, this.length)
  }

  var val = this[offset + --byteLength]
  var mul = 1
  while (byteLength > 0 && (mul *= 0x100)) {
    val += this[offset + --byteLength] * mul
  }

  return val
}

Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 1, this.length)
  return this[offset]
}

Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 2, this.length)
  return this[offset] | (this[offset + 1] << 8)
}

Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 2, this.length)
  return (this[offset] << 8) | this[offset + 1]
}

Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 4, this.length)

  return ((this[offset]) |
      (this[offset + 1] << 8) |
      (this[offset + 2] << 16)) +
      (this[offset + 3] * 0x1000000)
}

Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 4, this.length)

  return (this[offset] * 0x1000000) +
    ((this[offset + 1] << 16) |
    (this[offset + 2] << 8) |
    this[offset + 3])
}

Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {
  offset = offset >>> 0
  byteLength = byteLength >>> 0
  if (!noAssert) checkOffset(offset, byteLength, this.length)

  var val = this[offset]
  var mul = 1
  var i = 0
  while (++i < byteLength && (mul *= 0x100)) {
    val += this[offset + i] * mul
  }
  mul *= 0x80

  if (val >= mul) val -= Math.pow(2, 8 * byteLength)

  return val
}

Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {
  offset = offset >>> 0
  byteLength = byteLength >>> 0
  if (!noAssert) checkOffset(offset, byteLength, this.length)

  var i = byteLength
  var mul = 1
  var val = this[offset + --i]
  while (i > 0 && (mul *= 0x100)) {
    val += this[offset + --i] * mul
  }
  mul *= 0x80

  if (val >= mul) val -= Math.pow(2, 8 * byteLength)

  return val
}

Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 1, this.length)
  if (!(this[offset] & 0x80)) return (this[offset])
  return ((0xff - this[offset] + 1) * -1)
}

Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 2, this.length)
  var val = this[offset] | (this[offset + 1] << 8)
  return (val & 0x8000) ? val | 0xFFFF0000 : val
}

Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 2, this.length)
  var val = this[offset + 1] | (this[offset] << 8)
  return (val & 0x8000) ? val | 0xFFFF0000 : val
}

Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 4, this.length)

  return (this[offset]) |
    (this[offset + 1] << 8) |
    (this[offset + 2] << 16) |
    (this[offset + 3] << 24)
}

Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 4, this.length)

  return (this[offset] << 24) |
    (this[offset + 1] << 16) |
    (this[offset + 2] << 8) |
    (this[offset + 3])
}

Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 4, this.length)
  return ieee754.read(this, offset, true, 23, 4)
}

Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 4, this.length)
  return ieee754.read(this, offset, false, 23, 4)
}

Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 8, this.length)
  return ieee754.read(this, offset, true, 52, 8)
}

Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 8, this.length)
  return ieee754.read(this, offset, false, 52, 8)
}

function checkInt (buf, value, offset, ext, max, min) {
  if (!Buffer.isBuffer(buf)) throw new TypeError('"buffer" argument must be a Buffer instance')
  if (value > max || value < min) throw new RangeError('"value" argument is out of bounds')
  if (offset + ext > buf.length) throw new RangeError('Index out of range')
}

Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {
  value = +value
  offset = offset >>> 0
  byteLength = byteLength >>> 0
  if (!noAssert) {
    var maxBytes = Math.pow(2, 8 * byteLength) - 1
    checkInt(this, value, offset, byteLength, maxBytes, 0)
  }

  var mul = 1
  var i = 0
  this[offset] = value & 0xFF
  while (++i < byteLength && (mul *= 0x100)) {
    this[offset + i] = (value / mul) & 0xFF
  }

  return offset + byteLength
}

Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {
  value = +value
  offset = offset >>> 0
  byteLength = byteLength >>> 0
  if (!noAssert) {
    var maxBytes = Math.pow(2, 8 * byteLength) - 1
    checkInt(this, value, offset, byteLength, maxBytes, 0)
  }

  var i = byteLength - 1
  var mul = 1
  this[offset + i] = value & 0xFF
  while (--i >= 0 && (mul *= 0x100)) {
    this[offset + i] = (value / mul) & 0xFF
  }

  return offset + byteLength
}

Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)
  this[offset] = (value & 0xff)
  return offset + 1
}

Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
  this[offset] = (value & 0xff)
  this[offset + 1] = (value >>> 8)
  return offset + 2
}

Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
  this[offset] = (value >>> 8)
  this[offset + 1] = (value & 0xff)
  return offset + 2
}

Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
  this[offset + 3] = (value >>> 24)
  this[offset + 2] = (value >>> 16)
  this[offset + 1] = (value >>> 8)
  this[offset] = (value & 0xff)
  return offset + 4
}

Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
  this[offset] = (value >>> 24)
  this[offset + 1] = (value >>> 16)
  this[offset + 2] = (value >>> 8)
  this[offset + 3] = (value & 0xff)
  return offset + 4
}

Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) {
    var limit = Math.pow(2, (8 * byteLength) - 1)

    checkInt(this, value, offset, byteLength, limit - 1, -limit)
  }

  var i = 0
  var mul = 1
  var sub = 0
  this[offset] = value & 0xFF
  while (++i < byteLength && (mul *= 0x100)) {
    if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {
      sub = 1
    }
    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
  }

  return offset + byteLength
}

Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) {
    var limit = Math.pow(2, (8 * byteLength) - 1)

    checkInt(this, value, offset, byteLength, limit - 1, -limit)
  }

  var i = byteLength - 1
  var mul = 1
  var sub = 0
  this[offset + i] = value & 0xFF
  while (--i >= 0 && (mul *= 0x100)) {
    if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {
      sub = 1
    }
    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
  }

  return offset + byteLength
}

Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)
  if (value < 0) value = 0xff + value + 1
  this[offset] = (value & 0xff)
  return offset + 1
}

Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
  this[offset] = (value & 0xff)
  this[offset + 1] = (value >>> 8)
  return offset + 2
}

Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
  this[offset] = (value >>> 8)
  this[offset + 1] = (value & 0xff)
  return offset + 2
}

Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
  this[offset] = (value & 0xff)
  this[offset + 1] = (value >>> 8)
  this[offset + 2] = (value >>> 16)
  this[offset + 3] = (value >>> 24)
  return offset + 4
}

Buffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
  if (value < 0) value = 0xffffffff + value + 1
  this[offset] = (value >>> 24)
  this[offset + 1] = (value >>> 16)
  this[offset + 2] = (value >>> 8)
  this[offset + 3] = (value & 0xff)
  return offset + 4
}

function checkIEEE754 (buf, value, offset, ext, max, min) {
  if (offset + ext > buf.length) throw new RangeError('Index out of range')
  if (offset < 0) throw new RangeError('Index out of range')
}

function writeFloat (buf, value, offset, littleEndian, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) {
    checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)
  }
  ieee754.write(buf, value, offset, littleEndian, 23, 4)
  return offset + 4
}

Buffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {
  return writeFloat(this, value, offset, true, noAssert)
}

Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {
  return writeFloat(this, value, offset, false, noAssert)
}

function writeDouble (buf, value, offset, littleEndian, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) {
    checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)
  }
  ieee754.write(buf, value, offset, littleEndian, 52, 8)
  return offset + 8
}

Buffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {
  return writeDouble(this, value, offset, true, noAssert)
}

Buffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {
  return writeDouble(this, value, offset, false, noAssert)
}

// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
Buffer.prototype.copy = function copy (target, targetStart, start, end) {
  if (!Buffer.isBuffer(target)) throw new TypeError('argument should be a Buffer')
  if (!start) start = 0
  if (!end && end !== 0) end = this.length
  if (targetStart >= target.length) targetStart = target.length
  if (!targetStart) targetStart = 0
  if (end > 0 && end < start) end = start

  // Copy 0 bytes; we're done
  if (end === start) return 0
  if (target.length === 0 || this.length === 0) return 0

  // Fatal error conditions
  if (targetStart < 0) {
    throw new RangeError('targetStart out of bounds')
  }
  if (start < 0 || start >= this.length) throw new RangeError('Index out of range')
  if (end < 0) throw new RangeError('sourceEnd out of bounds')

  // Are we oob?
  if (end > this.length) end = this.length
  if (target.length - targetStart < end - start) {
    end = target.length - targetStart + start
  }

  var len = end - start

  if (this === target && typeof Uint8Array.prototype.copyWithin === 'function') {
    // Use built-in when available, missing from IE11
    this.copyWithin(targetStart, start, end)
  } else if (this === target && start < targetStart && targetStart < end) {
    // descending copy from end
    for (var i = len - 1; i >= 0; --i) {
      target[i + targetStart] = this[i + start]
    }
  } else {
    Uint8Array.prototype.set.call(
      target,
      this.subarray(start, end),
      targetStart
    )
  }

  return len
}

// Usage:
//    buffer.fill(number[, offset[, end]])
//    buffer.fill(buffer[, offset[, end]])
//    buffer.fill(string[, offset[, end]][, encoding])
Buffer.prototype.fill = function fill (val, start, end, encoding) {
  // Handle string cases:
  if (typeof val === 'string') {
    if (typeof start === 'string') {
      encoding = start
      start = 0
      end = this.length
    } else if (typeof end === 'string') {
      encoding = end
      end = this.length
    }
    if (encoding !== undefined && typeof encoding !== 'string') {
      throw new TypeError('encoding must be a string')
    }
    if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {
      throw new TypeError('Unknown encoding: ' + encoding)
    }
    if (val.length === 1) {
      var code = val.charCodeAt(0)
      if ((encoding === 'utf8' && code < 128) ||
          encoding === 'latin1') {
        // Fast path: If `val` fits into a single byte, use that numeric value.
        val = code
      }
    }
  } else if (typeof val === 'number') {
    val = val & 255
  }

  // Invalid ranges are not set to a default, so can range check early.
  if (start < 0 || this.length < start || this.length < end) {
    throw new RangeError('Out of range index')
  }

  if (end <= start) {
    return this
  }

  start = start >>> 0
  end = end === undefined ? this.length : end >>> 0

  if (!val) val = 0

  var i
  if (typeof val === 'number') {
    for (i = start; i < end; ++i) {
      this[i] = val
    }
  } else {
    var bytes = Buffer.isBuffer(val)
      ? val
      : Buffer.from(val, encoding)
    var len = bytes.length
    if (len === 0) {
      throw new TypeError('The value "' + val +
        '" is invalid for argument "value"')
    }
    for (i = 0; i < end - start; ++i) {
      this[i + start] = bytes[i % len]
    }
  }

  return this
}

// HELPER FUNCTIONS
// ================

var INVALID_BASE64_RE = /[^+/0-9A-Za-z-_]/g

function base64clean (str) {
  // Node takes equal signs as end of the Base64 encoding
  str = str.split('=')[0]
  // Node strips out invalid characters like \n and \t from the string, base64-js does not
  str = str.trim().replace(INVALID_BASE64_RE, '')
  // Node converts strings with length < 2 to ''
  if (str.length < 2) return ''
  // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
  while (str.length % 4 !== 0) {
    str = str + '='
  }
  return str
}

function toHex (n) {
  if (n < 16) return '0' + n.toString(16)
  return n.toString(16)
}

function utf8ToBytes (string, units) {
  units = units || Infinity
  var codePoint
  var length = string.length
  var leadSurrogate = null
  var bytes = []

  for (var i = 0; i < length; ++i) {
    codePoint = string.charCodeAt(i)

    // is surrogate component
    if (codePoint > 0xD7FF && codePoint < 0xE000) {
      // last char was a lead
      if (!leadSurrogate) {
        // no lead yet
        if (codePoint > 0xDBFF) {
          // unexpected trail
          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
          continue
        } else if (i + 1 === length) {
          // unpaired lead
          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
          continue
        }

        // valid lead
        leadSurrogate = codePoint

        continue
      }

      // 2 leads in a row
      if (codePoint < 0xDC00) {
        if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
        leadSurrogate = codePoint
        continue
      }

      // valid surrogate pair
      codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000
    } else if (leadSurrogate) {
      // valid bmp char, but last char was a lead
      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
    }

    leadSurrogate = null

    // encode utf8
    if (codePoint < 0x80) {
      if ((units -= 1) < 0) break
      bytes.push(codePoint)
    } else if (codePoint < 0x800) {
      if ((units -= 2) < 0) break
      bytes.push(
        codePoint >> 0x6 | 0xC0,
        codePoint & 0x3F | 0x80
      )
    } else if (codePoint < 0x10000) {
      if ((units -= 3) < 0) break
      bytes.push(
        codePoint >> 0xC | 0xE0,
        codePoint >> 0x6 & 0x3F | 0x80,
        codePoint & 0x3F | 0x80
      )
    } else if (codePoint < 0x110000) {
      if ((units -= 4) < 0) break
      bytes.push(
        codePoint >> 0x12 | 0xF0,
        codePoint >> 0xC & 0x3F | 0x80,
        codePoint >> 0x6 & 0x3F | 0x80,
        codePoint & 0x3F | 0x80
      )
    } else {
      throw new Error('Invalid code point')
    }
  }

  return bytes
}

function asciiToBytes (str) {
  var byteArray = []
  for (var i = 0; i < str.length; ++i) {
    // Node's code seems to be doing this and not & 0x7F..
    byteArray.push(str.charCodeAt(i) & 0xFF)
  }
  return byteArray
}

function utf16leToBytes (str, units) {
  var c, hi, lo
  var byteArray = []
  for (var i = 0; i < str.length; ++i) {
    if ((units -= 2) < 0) break

    c = str.charCodeAt(i)
    hi = c >> 8
    lo = c % 256
    byteArray.push(lo)
    byteArray.push(hi)
  }

  return byteArray
}

function base64ToBytes (str) {
  return base64.toByteArray(base64clean(str))
}

function blitBuffer (src, dst, offset, length) {
  for (var i = 0; i < length; ++i) {
    if ((i + offset >= dst.length) || (i >= src.length)) break
    dst[i + offset] = src[i]
  }
  return i
}

// ArrayBuffer or Uint8Array objects from other contexts (i.e. iframes) do not pass
// the `instanceof` check but they should be treated as of that type.
// See: https://github.com/feross/buffer/issues/166
function isInstance (obj, type) {
  return obj instanceof type ||
    (obj != null && obj.constructor != null && obj.constructor.name != null &&
      obj.constructor.name === type.name)
}
function numberIsNaN (obj) {
  // For IE11 support
  return obj !== obj // eslint-disable-line no-self-compare
}

}).call(this)}).call(this,require("buffer").Buffer)

},{"base64-js":17,"buffer":18,"ieee754":19}],19:[function(require,module,exports){
/*! ieee754. BSD-3-Clause License. Feross Aboukhadijeh <https://feross.org/opensource> */
exports.read = function (buffer, offset, isLE, mLen, nBytes) {
  var e, m
  var eLen = (nBytes * 8) - mLen - 1
  var eMax = (1 << eLen) - 1
  var eBias = eMax >> 1
  var nBits = -7
  var i = isLE ? (nBytes - 1) : 0
  var d = isLE ? -1 : 1
  var s = buffer[offset + i]

  i += d

  e = s & ((1 << (-nBits)) - 1)
  s >>= (-nBits)
  nBits += eLen
  for (; nBits > 0; e = (e * 256) + buffer[offset + i], i += d, nBits -= 8) {}

  m = e & ((1 << (-nBits)) - 1)
  e >>= (-nBits)
  nBits += mLen
  for (; nBits > 0; m = (m * 256) + buffer[offset + i], i += d, nBits -= 8) {}

  if (e === 0) {
    e = 1 - eBias
  } else if (e === eMax) {
    return m ? NaN : ((s ? -1 : 1) * Infinity)
  } else {
    m = m + Math.pow(2, mLen)
    e = e - eBias
  }
  return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
}

exports.write = function (buffer, value, offset, isLE, mLen, nBytes) {
  var e, m, c
  var eLen = (nBytes * 8) - mLen - 1
  var eMax = (1 << eLen) - 1
  var eBias = eMax >> 1
  var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)
  var i = isLE ? 0 : (nBytes - 1)
  var d = isLE ? 1 : -1
  var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0

  value = Math.abs(value)

  if (isNaN(value) || value === Infinity) {
    m = isNaN(value) ? 1 : 0
    e = eMax
  } else {
    e = Math.floor(Math.log(value) / Math.LN2)
    if (value * (c = Math.pow(2, -e)) < 1) {
      e--
      c *= 2
    }
    if (e + eBias >= 1) {
      value += rt / c
    } else {
      value += rt * Math.pow(2, 1 - eBias)
    }
    if (value * c >= 2) {
      e++
      c /= 2
    }

    if (e + eBias >= eMax) {
      m = 0
      e = eMax
    } else if (e + eBias >= 1) {
      m = ((value * c) - 1) * Math.pow(2, mLen)
      e = e + eBias
    } else {
      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)
      e = 0
    }
  }

  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}

  e = (e << mLen) | m
  eLen += mLen
  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}

  buffer[offset + i - d] |= s * 128
}

},{}],20:[function(require,module,exports){
(function (global,Buffer){(function (){
//
// THIS FILE IS AUTOMATICALLY GENERATED! DO NOT EDIT BY HAND!
//
;
(function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined'
        ? module.exports = factory()
        : typeof define === 'function' && define.amd
            ? define(factory) :
            // cf. https://github.com/dankogai/js-base64/issues/119
            (function () {
                // existing version for noConflict()
                var _Base64 = global.Base64;
                var gBase64 = factory();
                gBase64.noConflict = function () {
                    global.Base64 = _Base64;
                    return gBase64;
                };
                if (global.Meteor) { // Meteor.js
                    Base64 = gBase64;
                }
                global.Base64 = gBase64;
            })();
}((typeof self !== 'undefined' ? self
    : typeof window !== 'undefined' ? window
        : typeof global !== 'undefined' ? global
            : this), function () {
    'use strict';
    /**
     *  base64.ts
     *
     *  Licensed under the BSD 3-Clause License.
     *    http://opensource.org/licenses/BSD-3-Clause
     *
     *  References:
     *    http://en.wikipedia.org/wiki/Base64
     *
     * @author Dan Kogai (https://github.com/dankogai)
     */
    var version = '3.7.7';
    /**
     * @deprecated use lowercase `version`.
     */
    var VERSION = version;
    var _hasBuffer = typeof Buffer === 'function';
    var _TD = typeof TextDecoder === 'function' ? new TextDecoder() : undefined;
    var _TE = typeof TextEncoder === 'function' ? new TextEncoder() : undefined;
    var b64ch = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
    var b64chs = Array.prototype.slice.call(b64ch);
    var b64tab = (function (a) {
        var tab = {};
        a.forEach(function (c, i) { return tab[c] = i; });
        return tab;
    })(b64chs);
    var b64re = /^(?:[A-Za-z\d+\/]{4})*?(?:[A-Za-z\d+\/]{2}(?:==)?|[A-Za-z\d+\/]{3}=?)?$/;
    var _fromCC = String.fromCharCode.bind(String);
    var _U8Afrom = typeof Uint8Array.from === 'function'
        ? Uint8Array.from.bind(Uint8Array)
        : function (it) { return new Uint8Array(Array.prototype.slice.call(it, 0)); };
    var _mkUriSafe = function (src) { return src
        .replace(/=/g, '').replace(/[+\/]/g, function (m0) { return m0 == '+' ? '-' : '_'; }); };
    var _tidyB64 = function (s) { return s.replace(/[^A-Za-z0-9\+\/]/g, ''); };
    /**
     * polyfill version of `btoa`
     */
    var btoaPolyfill = function (bin) {
        // console.log('polyfilled');
        var u32, c0, c1, c2, asc = '';
        var pad = bin.length % 3;
        for (var i = 0; i < bin.length;) {
            if ((c0 = bin.charCodeAt(i++)) > 255 ||
                (c1 = bin.charCodeAt(i++)) > 255 ||
                (c2 = bin.charCodeAt(i++)) > 255)
                throw new TypeError('invalid character found');
            u32 = (c0 << 16) | (c1 << 8) | c2;
            asc += b64chs[u32 >> 18 & 63]
                + b64chs[u32 >> 12 & 63]
                + b64chs[u32 >> 6 & 63]
                + b64chs[u32 & 63];
        }
        return pad ? asc.slice(0, pad - 3) + "===".substring(pad) : asc;
    };
    /**
     * does what `window.btoa` of web browsers do.
     * @param {String} bin binary string
     * @returns {string} Base64-encoded string
     */
    var _btoa = typeof btoa === 'function' ? function (bin) { return btoa(bin); }
        : _hasBuffer ? function (bin) { return Buffer.from(bin, 'binary').toString('base64'); }
            : btoaPolyfill;
    var _fromUint8Array = _hasBuffer
        ? function (u8a) { return Buffer.from(u8a).toString('base64'); }
        : function (u8a) {
            // cf. https://stackoverflow.com/questions/12710001/how-to-convert-uint8-array-to-base64-encoded-string/12713326#12713326
            var maxargs = 0x1000;
            var strs = [];
            for (var i = 0, l = u8a.length; i < l; i += maxargs) {
                strs.push(_fromCC.apply(null, u8a.subarray(i, i + maxargs)));
            }
            return _btoa(strs.join(''));
        };
    /**
     * converts a Uint8Array to a Base64 string.
     * @param {boolean} [urlsafe] URL-and-filename-safe a la RFC4648 §5
     * @returns {string} Base64 string
     */
    var fromUint8Array = function (u8a, urlsafe) {
        if (urlsafe === void 0) { urlsafe = false; }
        return urlsafe ? _mkUriSafe(_fromUint8Array(u8a)) : _fromUint8Array(u8a);
    };
    // This trick is found broken https://github.com/dankogai/js-base64/issues/130
    // const utob = (src: string) => unescape(encodeURIComponent(src));
    // reverting good old fationed regexp
    var cb_utob = function (c) {
        if (c.length < 2) {
            var cc = c.charCodeAt(0);
            return cc < 0x80 ? c
                : cc < 0x800 ? (_fromCC(0xc0 | (cc >>> 6))
                    + _fromCC(0x80 | (cc & 0x3f)))
                    : (_fromCC(0xe0 | ((cc >>> 12) & 0x0f))
                        + _fromCC(0x80 | ((cc >>> 6) & 0x3f))
                        + _fromCC(0x80 | (cc & 0x3f)));
        }
        else {
            var cc = 0x10000
                + (c.charCodeAt(0) - 0xD800) * 0x400
                + (c.charCodeAt(1) - 0xDC00);
            return (_fromCC(0xf0 | ((cc >>> 18) & 0x07))
                + _fromCC(0x80 | ((cc >>> 12) & 0x3f))
                + _fromCC(0x80 | ((cc >>> 6) & 0x3f))
                + _fromCC(0x80 | (cc & 0x3f)));
        }
    };
    var re_utob = /[\uD800-\uDBFF][\uDC00-\uDFFFF]|[^\x00-\x7F]/g;
    /**
     * @deprecated should have been internal use only.
     * @param {string} src UTF-8 string
     * @returns {string} UTF-16 string
     */
    var utob = function (u) { return u.replace(re_utob, cb_utob); };
    //
    var _encode = _hasBuffer
        ? function (s) { return Buffer.from(s, 'utf8').toString('base64'); }
        : _TE
            ? function (s) { return _fromUint8Array(_TE.encode(s)); }
            : function (s) { return _btoa(utob(s)); };
    /**
     * converts a UTF-8-encoded string to a Base64 string.
     * @param {boolean} [urlsafe] if `true` make the result URL-safe
     * @returns {string} Base64 string
     */
    var encode = function (src, urlsafe) {
        if (urlsafe === void 0) { urlsafe = false; }
        return urlsafe
            ? _mkUriSafe(_encode(src))
            : _encode(src);
    };
    /**
     * converts a UTF-8-encoded string to URL-safe Base64 RFC4648 §5.
     * @returns {string} Base64 string
     */
    var encodeURI = function (src) { return encode(src, true); };
    // This trick is found broken https://github.com/dankogai/js-base64/issues/130
    // const btou = (src: string) => decodeURIComponent(escape(src));
    // reverting good old fationed regexp
    var re_btou = /[\xC0-\xDF][\x80-\xBF]|[\xE0-\xEF][\x80-\xBF]{2}|[\xF0-\xF7][\x80-\xBF]{3}/g;
    var cb_btou = function (cccc) {
        switch (cccc.length) {
            case 4:
                var cp = ((0x07 & cccc.charCodeAt(0)) << 18)
                    | ((0x3f & cccc.charCodeAt(1)) << 12)
                    | ((0x3f & cccc.charCodeAt(2)) << 6)
                    | (0x3f & cccc.charCodeAt(3)), offset = cp - 0x10000;
                return (_fromCC((offset >>> 10) + 0xD800)
                    + _fromCC((offset & 0x3FF) + 0xDC00));
            case 3:
                return _fromCC(((0x0f & cccc.charCodeAt(0)) << 12)
                    | ((0x3f & cccc.charCodeAt(1)) << 6)
                    | (0x3f & cccc.charCodeAt(2)));
            default:
                return _fromCC(((0x1f & cccc.charCodeAt(0)) << 6)
                    | (0x3f & cccc.charCodeAt(1)));
        }
    };
    /**
     * @deprecated should have been internal use only.
     * @param {string} src UTF-16 string
     * @returns {string} UTF-8 string
     */
    var btou = function (b) { return b.replace(re_btou, cb_btou); };
    /**
     * polyfill version of `atob`
     */
    var atobPolyfill = function (asc) {
        // console.log('polyfilled');
        asc = asc.replace(/\s+/g, '');
        if (!b64re.test(asc))
            throw new TypeError('malformed base64.');
        asc += '=='.slice(2 - (asc.length & 3));
        var u24, bin = '', r1, r2;
        for (var i = 0; i < asc.length;) {
            u24 = b64tab[asc.charAt(i++)] << 18
                | b64tab[asc.charAt(i++)] << 12
                | (r1 = b64tab[asc.charAt(i++)]) << 6
                | (r2 = b64tab[asc.charAt(i++)]);
            bin += r1 === 64 ? _fromCC(u24 >> 16 & 255)
                : r2 === 64 ? _fromCC(u24 >> 16 & 255, u24 >> 8 & 255)
                    : _fromCC(u24 >> 16 & 255, u24 >> 8 & 255, u24 & 255);
        }
        return bin;
    };
    /**
     * does what `window.atob` of web browsers do.
     * @param {String} asc Base64-encoded string
     * @returns {string} binary string
     */
    var _atob = typeof atob === 'function' ? function (asc) { return atob(_tidyB64(asc)); }
        : _hasBuffer ? function (asc) { return Buffer.from(asc, 'base64').toString('binary'); }
            : atobPolyfill;
    //
    var _toUint8Array = _hasBuffer
        ? function (a) { return _U8Afrom(Buffer.from(a, 'base64')); }
        : function (a) { return _U8Afrom(_atob(a).split('').map(function (c) { return c.charCodeAt(0); })); };
    /**
     * converts a Base64 string to a Uint8Array.
     */
    var toUint8Array = function (a) { return _toUint8Array(_unURI(a)); };
    //
    var _decode = _hasBuffer
        ? function (a) { return Buffer.from(a, 'base64').toString('utf8'); }
        : _TD
            ? function (a) { return _TD.decode(_toUint8Array(a)); }
            : function (a) { return btou(_atob(a)); };
    var _unURI = function (a) { return _tidyB64(a.replace(/[-_]/g, function (m0) { return m0 == '-' ? '+' : '/'; })); };
    /**
     * converts a Base64 string to a UTF-8 string.
     * @param {String} src Base64 string.  Both normal and URL-safe are supported
     * @returns {string} UTF-8 string
     */
    var decode = function (src) { return _decode(_unURI(src)); };
    /**
     * check if a value is a valid Base64 string
     * @param {String} src a value to check
      */
    var isValid = function (src) {
        if (typeof src !== 'string')
            return false;
        var s = src.replace(/\s+/g, '').replace(/={0,2}$/, '');
        return !/[^\s0-9a-zA-Z\+/]/.test(s) || !/[^\s0-9a-zA-Z\-_]/.test(s);
    };
    //
    var _noEnum = function (v) {
        return {
            value: v, enumerable: false, writable: true, configurable: true
        };
    };
    /**
     * extend String.prototype with relevant methods
     */
    var extendString = function () {
        var _add = function (name, body) { return Object.defineProperty(String.prototype, name, _noEnum(body)); };
        _add('fromBase64', function () { return decode(this); });
        _add('toBase64', function (urlsafe) { return encode(this, urlsafe); });
        _add('toBase64URI', function () { return encode(this, true); });
        _add('toBase64URL', function () { return encode(this, true); });
        _add('toUint8Array', function () { return toUint8Array(this); });
    };
    /**
     * extend Uint8Array.prototype with relevant methods
     */
    var extendUint8Array = function () {
        var _add = function (name, body) { return Object.defineProperty(Uint8Array.prototype, name, _noEnum(body)); };
        _add('toBase64', function (urlsafe) { return fromUint8Array(this, urlsafe); });
        _add('toBase64URI', function () { return fromUint8Array(this, true); });
        _add('toBase64URL', function () { return fromUint8Array(this, true); });
    };
    /**
     * extend Builtin prototypes with relevant methods
     */
    var extendBuiltins = function () {
        extendString();
        extendUint8Array();
    };
    var gBase64 = {
        version: version,
        VERSION: VERSION,
        atob: _atob,
        atobPolyfill: atobPolyfill,
        btoa: _btoa,
        btoaPolyfill: btoaPolyfill,
        fromBase64: decode,
        toBase64: encode,
        encode: encode,
        encodeURI: encodeURI,
        encodeURL: encodeURI,
        utob: utob,
        btou: btou,
        decode: decode,
        isValid: isValid,
        fromUint8Array: fromUint8Array,
        toUint8Array: toUint8Array,
        extendString: extendString,
        extendUint8Array: extendUint8Array,
        extendBuiltins: extendBuiltins
    };
    //
    // export Base64 to the namespace
    //
    // ES5 is yet to have Object.assign() that may make transpilers unhappy.
    // gBase64.Base64 = Object.assign({}, gBase64);
    gBase64.Base64 = {};
    Object.keys(gBase64).forEach(function (k) { return gBase64.Base64[k] = gBase64[k]; });
    return gBase64;
}));

}).call(this)}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {},require("buffer").Buffer)

},{"buffer":18}],21:[function(require,module,exports){
'use strict';

var has = Object.prototype.hasOwnProperty
  , undef;

/**
 * Decode a URI encoded string.
 *
 * @param {String} input The URI encoded string.
 * @returns {String|Null} The decoded string.
 * @api private
 */
function decode(input) {
  try {
    return decodeURIComponent(input.replace(/\+/g, ' '));
  } catch (e) {
    return null;
  }
}

/**
 * Attempts to encode a given input.
 *
 * @param {String} input The string that needs to be encoded.
 * @returns {String|Null} The encoded string.
 * @api private
 */
function encode(input) {
  try {
    return encodeURIComponent(input);
  } catch (e) {
    return null;
  }
}

/**
 * Simple query string parser.
 *
 * @param {String} query The query string that needs to be parsed.
 * @returns {Object}
 * @api public
 */
function querystring(query) {
  var parser = /([^=?#&]+)=?([^&]*)/g
    , result = {}
    , part;

  while (part = parser.exec(query)) {
    var key = decode(part[1])
      , value = decode(part[2]);

    //
    // Prevent overriding of existing properties. This ensures that build-in
    // methods like `toString` or __proto__ are not overriden by malicious
    // querystrings.
    //
    // In the case if failed decoding, we want to omit the key/value pairs
    // from the result.
    //
    if (key === null || value === null || key in result) continue;
    result[key] = value;
  }

  return result;
}

/**
 * Transform a query string to an object.
 *
 * @param {Object} obj Object that should be transformed.
 * @param {String} prefix Optional prefix.
 * @returns {String}
 * @api public
 */
function querystringify(obj, prefix) {
  prefix = prefix || '';

  var pairs = []
    , value
    , key;

  //
  // Optionally prefix with a '?' if needed
  //
  if ('string' !== typeof prefix) prefix = '?';

  for (key in obj) {
    if (has.call(obj, key)) {
      value = obj[key];

      //
      // Edge cases where we actually want to encode the value to an empty
      // string instead of the stringified value.
      //
      if (!value && (value === null || value === undef || isNaN(value))) {
        value = '';
      }

      key = encode(key);
      value = encode(value);

      //
      // If we failed to encode the strings, we should bail out as we don't
      // want to add invalid strings to the query.
      //
      if (key === null || value === null) continue;
      pairs.push(key +'='+ value);
    }
  }

  return pairs.length ? prefix + pairs.join('&') : '';
}

//
// Expose the module.
//
exports.stringify = querystringify;
exports.parse = querystring;

},{}],22:[function(require,module,exports){
'use strict';

/**
 * Check if we're required to add a port number.
 *
 * @see https://url.spec.whatwg.org/#default-port
 * @param {Number|String} port Port number we need to check
 * @param {String} protocol Protocol we need to check against.
 * @returns {Boolean} Is it a default port for the given protocol
 * @api private
 */
module.exports = function required(port, protocol) {
  protocol = protocol.split(':')[0];
  port = +port;

  if (!port) return false;

  switch (protocol) {
    case 'http':
    case 'ws':
    return port !== 80;

    case 'https':
    case 'wss':
    return port !== 443;

    case 'ftp':
    return port !== 21;

    case 'gopher':
    return port !== 70;

    case 'file':
    return false;
  }

  return port !== 0;
};

},{}],23:[function(require,module,exports){
(function (global){(function (){
'use strict';

var required = require('requires-port')
  , qs = require('querystringify')
  , controlOrWhitespace = /^[\x00-\x20\u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff]+/
  , CRHTLF = /[\n\r\t]/g
  , slashes = /^[A-Za-z][A-Za-z0-9+-.]*:\/\//
  , port = /:\d+$/
  , protocolre = /^([a-z][a-z0-9.+-]*:)?(\/\/)?([\\/]+)?([\S\s]*)/i
  , windowsDriveLetter = /^[a-zA-Z]:/;

/**
 * Remove control characters and whitespace from the beginning of a string.
 *
 * @param {Object|String} str String to trim.
 * @returns {String} A new string representing `str` stripped of control
 *     characters and whitespace from its beginning.
 * @public
 */
function trimLeft(str) {
  return (str ? str : '').toString().replace(controlOrWhitespace, '');
}

/**
 * These are the parse rules for the URL parser, it informs the parser
 * about:
 *
 * 0. The char it Needs to parse, if it's a string it should be done using
 *    indexOf, RegExp using exec and NaN means set as current value.
 * 1. The property we should set when parsing this value.
 * 2. Indication if it's backwards or forward parsing, when set as number it's
 *    the value of extra chars that should be split off.
 * 3. Inherit from location if non existing in the parser.
 * 4. `toLowerCase` the resulting value.
 */
var rules = [
  ['#', 'hash'],                        // Extract from the back.
  ['?', 'query'],                       // Extract from the back.
  function sanitize(address, url) {     // Sanitize what is left of the address
    return isSpecial(url.protocol) ? address.replace(/\\/g, '/') : address;
  },
  ['/', 'pathname'],                    // Extract from the back.
  ['@', 'auth', 1],                     // Extract from the front.
  [NaN, 'host', undefined, 1, 1],       // Set left over value.
  [/:(\d*)$/, 'port', undefined, 1],    // RegExp the back.
  [NaN, 'hostname', undefined, 1, 1]    // Set left over.
];

/**
 * These properties should not be copied or inherited from. This is only needed
 * for all non blob URL's as a blob URL does not include a hash, only the
 * origin.
 *
 * @type {Object}
 * @private
 */
var ignore = { hash: 1, query: 1 };

/**
 * The location object differs when your code is loaded through a normal page,
 * Worker or through a worker using a blob. And with the blobble begins the
 * trouble as the location object will contain the URL of the blob, not the
 * location of the page where our code is loaded in. The actual origin is
 * encoded in the `pathname` so we can thankfully generate a good "default"
 * location from it so we can generate proper relative URL's again.
 *
 * @param {Object|String} loc Optional default location object.
 * @returns {Object} lolcation object.
 * @public
 */
function lolcation(loc) {
  var globalVar;

  if (typeof window !== 'undefined') globalVar = window;
  else if (typeof global !== 'undefined') globalVar = global;
  else if (typeof self !== 'undefined') globalVar = self;
  else globalVar = {};

  var location = globalVar.location || {};
  loc = loc || location;

  var finaldestination = {}
    , type = typeof loc
    , key;

  if ('blob:' === loc.protocol) {
    finaldestination = new Url(unescape(loc.pathname), {});
  } else if ('string' === type) {
    finaldestination = new Url(loc, {});
    for (key in ignore) delete finaldestination[key];
  } else if ('object' === type) {
    for (key in loc) {
      if (key in ignore) continue;
      finaldestination[key] = loc[key];
    }

    if (finaldestination.slashes === undefined) {
      finaldestination.slashes = slashes.test(loc.href);
    }
  }

  return finaldestination;
}

/**
 * Check whether a protocol scheme is special.
 *
 * @param {String} The protocol scheme of the URL
 * @return {Boolean} `true` if the protocol scheme is special, else `false`
 * @private
 */
function isSpecial(scheme) {
  return (
    scheme === 'file:' ||
    scheme === 'ftp:' ||
    scheme === 'http:' ||
    scheme === 'https:' ||
    scheme === 'ws:' ||
    scheme === 'wss:'
  );
}

/**
 * @typedef ProtocolExtract
 * @type Object
 * @property {String} protocol Protocol matched in the URL, in lowercase.
 * @property {Boolean} slashes `true` if protocol is followed by "//", else `false`.
 * @property {String} rest Rest of the URL that is not part of the protocol.
 */

/**
 * Extract protocol information from a URL with/without double slash ("//").
 *
 * @param {String} address URL we want to extract from.
 * @param {Object} location
 * @return {ProtocolExtract} Extracted information.
 * @private
 */
function extractProtocol(address, location) {
  address = trimLeft(address);
  address = address.replace(CRHTLF, '');
  location = location || {};

  var match = protocolre.exec(address);
  var protocol = match[1] ? match[1].toLowerCase() : '';
  var forwardSlashes = !!match[2];
  var otherSlashes = !!match[3];
  var slashesCount = 0;
  var rest;

  if (forwardSlashes) {
    if (otherSlashes) {
      rest = match[2] + match[3] + match[4];
      slashesCount = match[2].length + match[3].length;
    } else {
      rest = match[2] + match[4];
      slashesCount = match[2].length;
    }
  } else {
    if (otherSlashes) {
      rest = match[3] + match[4];
      slashesCount = match[3].length;
    } else {
      rest = match[4]
    }
  }

  if (protocol === 'file:') {
    if (slashesCount >= 2) {
      rest = rest.slice(2);
    }
  } else if (isSpecial(protocol)) {
    rest = match[4];
  } else if (protocol) {
    if (forwardSlashes) {
      rest = rest.slice(2);
    }
  } else if (slashesCount >= 2 && isSpecial(location.protocol)) {
    rest = match[4];
  }

  return {
    protocol: protocol,
    slashes: forwardSlashes || isSpecial(protocol),
    slashesCount: slashesCount,
    rest: rest
  };
}

/**
 * Resolve a relative URL pathname against a base URL pathname.
 *
 * @param {String} relative Pathname of the relative URL.
 * @param {String} base Pathname of the base URL.
 * @return {String} Resolved pathname.
 * @private
 */
function resolve(relative, base) {
  if (relative === '') return base;

  var path = (base || '/').split('/').slice(0, -1).concat(relative.split('/'))
    , i = path.length
    , last = path[i - 1]
    , unshift = false
    , up = 0;

  while (i--) {
    if (path[i] === '.') {
      path.splice(i, 1);
    } else if (path[i] === '..') {
      path.splice(i, 1);
      up++;
    } else if (up) {
      if (i === 0) unshift = true;
      path.splice(i, 1);
      up--;
    }
  }

  if (unshift) path.unshift('');
  if (last === '.' || last === '..') path.push('');

  return path.join('/');
}

/**
 * The actual URL instance. Instead of returning an object we've opted-in to
 * create an actual constructor as it's much more memory efficient and
 * faster and it pleases my OCD.
 *
 * It is worth noting that we should not use `URL` as class name to prevent
 * clashes with the global URL instance that got introduced in browsers.
 *
 * @constructor
 * @param {String} address URL we want to parse.
 * @param {Object|String} [location] Location defaults for relative paths.
 * @param {Boolean|Function} [parser] Parser for the query string.
 * @private
 */
function Url(address, location, parser) {
  address = trimLeft(address);
  address = address.replace(CRHTLF, '');

  if (!(this instanceof Url)) {
    return new Url(address, location, parser);
  }

  var relative, extracted, parse, instruction, index, key
    , instructions = rules.slice()
    , type = typeof location
    , url = this
    , i = 0;

  //
  // The following if statements allows this module two have compatibility with
  // 2 different API:
  //
  // 1. Node.js's `url.parse` api which accepts a URL, boolean as arguments
  //    where the boolean indicates that the query string should also be parsed.
  //
  // 2. The `URL` interface of the browser which accepts a URL, object as
  //    arguments. The supplied object will be used as default values / fall-back
  //    for relative paths.
  //
  if ('object' !== type && 'string' !== type) {
    parser = location;
    location = null;
  }

  if (parser && 'function' !== typeof parser) parser = qs.parse;

  location = lolcation(location);

  //
  // Extract protocol information before running the instructions.
  //
  extracted = extractProtocol(address || '', location);
  relative = !extracted.protocol && !extracted.slashes;
  url.slashes = extracted.slashes || relative && location.slashes;
  url.protocol = extracted.protocol || location.protocol || '';
  address = extracted.rest;

  //
  // When the authority component is absent the URL starts with a path
  // component.
  //
  if (
    extracted.protocol === 'file:' && (
      extracted.slashesCount !== 2 || windowsDriveLetter.test(address)) ||
    (!extracted.slashes &&
      (extracted.protocol ||
        extracted.slashesCount < 2 ||
        !isSpecial(url.protocol)))
  ) {
    instructions[3] = [/(.*)/, 'pathname'];
  }

  for (; i < instructions.length; i++) {
    instruction = instructions[i];

    if (typeof instruction === 'function') {
      address = instruction(address, url);
      continue;
    }

    parse = instruction[0];
    key = instruction[1];

    if (parse !== parse) {
      url[key] = address;
    } else if ('string' === typeof parse) {
      index = parse === '@'
        ? address.lastIndexOf(parse)
        : address.indexOf(parse);

      if (~index) {
        if ('number' === typeof instruction[2]) {
          url[key] = address.slice(0, index);
          address = address.slice(index + instruction[2]);
        } else {
          url[key] = address.slice(index);
          address = address.slice(0, index);
        }
      }
    } else if ((index = parse.exec(address))) {
      url[key] = index[1];
      address = address.slice(0, index.index);
    }

    url[key] = url[key] || (
      relative && instruction[3] ? location[key] || '' : ''
    );

    //
    // Hostname, host and protocol should be lowercased so they can be used to
    // create a proper `origin`.
    //
    if (instruction[4]) url[key] = url[key].toLowerCase();
  }

  //
  // Also parse the supplied query string in to an object. If we're supplied
  // with a custom parser as function use that instead of the default build-in
  // parser.
  //
  if (parser) url.query = parser(url.query);

  //
  // If the URL is relative, resolve the pathname against the base URL.
  //
  if (
      relative
    && location.slashes
    && url.pathname.charAt(0) !== '/'
    && (url.pathname !== '' || location.pathname !== '')
  ) {
    url.pathname = resolve(url.pathname, location.pathname);
  }

  //
  // Default to a / for pathname if none exists. This normalizes the URL
  // to always have a /
  //
  if (url.pathname.charAt(0) !== '/' && isSpecial(url.protocol)) {
    url.pathname = '/' + url.pathname;
  }

  //
  // We should not add port numbers if they are already the default port number
  // for a given protocol. As the host also contains the port number we're going
  // override it with the hostname which contains no port number.
  //
  if (!required(url.port, url.protocol)) {
    url.host = url.hostname;
    url.port = '';
  }

  //
  // Parse down the `auth` for the username and password.
  //
  url.username = url.password = '';

  if (url.auth) {
    index = url.auth.indexOf(':');

    if (~index) {
      url.username = url.auth.slice(0, index);
      url.username = encodeURIComponent(decodeURIComponent(url.username));

      url.password = url.auth.slice(index + 1);
      url.password = encodeURIComponent(decodeURIComponent(url.password))
    } else {
      url.username = encodeURIComponent(decodeURIComponent(url.auth));
    }

    url.auth = url.password ? url.username +':'+ url.password : url.username;
  }

  url.origin = url.protocol !== 'file:' && isSpecial(url.protocol) && url.host
    ? url.protocol +'//'+ url.host
    : 'null';

  //
  // The href is just the compiled result.
  //
  url.href = url.toString();
}

/**
 * This is convenience method for changing properties in the URL instance to
 * insure that they all propagate correctly.
 *
 * @param {String} part          Property we need to adjust.
 * @param {Mixed} value          The newly assigned value.
 * @param {Boolean|Function} fn  When setting the query, it will be the function
 *                               used to parse the query.
 *                               When setting the protocol, double slash will be
 *                               removed from the final url if it is true.
 * @returns {URL} URL instance for chaining.
 * @public
 */
function set(part, value, fn) {
  var url = this;

  switch (part) {
    case 'query':
      if ('string' === typeof value && value.length) {
        value = (fn || qs.parse)(value);
      }

      url[part] = value;
      break;

    case 'port':
      url[part] = value;

      if (!required(value, url.protocol)) {
        url.host = url.hostname;
        url[part] = '';
      } else if (value) {
        url.host = url.hostname +':'+ value;
      }

      break;

    case 'hostname':
      url[part] = value;

      if (url.port) value += ':'+ url.port;
      url.host = value;
      break;

    case 'host':
      url[part] = value;

      if (port.test(value)) {
        value = value.split(':');
        url.port = value.pop();
        url.hostname = value.join(':');
      } else {
        url.hostname = value;
        url.port = '';
      }

      break;

    case 'protocol':
      url.protocol = value.toLowerCase();
      url.slashes = !fn;
      break;

    case 'pathname':
    case 'hash':
      if (value) {
        var char = part === 'pathname' ? '/' : '#';
        url[part] = value.charAt(0) !== char ? char + value : value;
      } else {
        url[part] = value;
      }
      break;

    case 'username':
    case 'password':
      url[part] = encodeURIComponent(value);
      break;

    case 'auth':
      var index = value.indexOf(':');

      if (~index) {
        url.username = value.slice(0, index);
        url.username = encodeURIComponent(decodeURIComponent(url.username));

        url.password = value.slice(index + 1);
        url.password = encodeURIComponent(decodeURIComponent(url.password));
      } else {
        url.username = encodeURIComponent(decodeURIComponent(value));
      }
  }

  for (var i = 0; i < rules.length; i++) {
    var ins = rules[i];

    if (ins[4]) url[ins[1]] = url[ins[1]].toLowerCase();
  }

  url.auth = url.password ? url.username +':'+ url.password : url.username;

  url.origin = url.protocol !== 'file:' && isSpecial(url.protocol) && url.host
    ? url.protocol +'//'+ url.host
    : 'null';

  url.href = url.toString();

  return url;
}

/**
 * Transform the properties back in to a valid and full URL string.
 *
 * @param {Function} stringify Optional query stringify function.
 * @returns {String} Compiled version of the URL.
 * @public
 */
function toString(stringify) {
  if (!stringify || 'function' !== typeof stringify) stringify = qs.stringify;

  var query
    , url = this
    , host = url.host
    , protocol = url.protocol;

  if (protocol && protocol.charAt(protocol.length - 1) !== ':') protocol += ':';

  var result =
    protocol +
    ((url.protocol && url.slashes) || isSpecial(url.protocol) ? '//' : '');

  if (url.username) {
    result += url.username;
    if (url.password) result += ':'+ url.password;
    result += '@';
  } else if (url.password) {
    result += ':'+ url.password;
    result += '@';
  } else if (
    url.protocol !== 'file:' &&
    isSpecial(url.protocol) &&
    !host &&
    url.pathname !== '/'
  ) {
    //
    // Add back the empty userinfo, otherwise the original invalid URL
    // might be transformed into a valid one with `url.pathname` as host.
    //
    result += '@';
  }

  //
  // Trailing colon is removed from `url.host` when it is parsed. If it still
  // ends with a colon, then add back the trailing colon that was removed. This
  // prevents an invalid URL from being transformed into a valid one.
  //
  if (host[host.length - 1] === ':' || (port.test(url.hostname) && !url.port)) {
    host += ':';
  }

  result += host + url.pathname;

  query = 'object' === typeof url.query ? stringify(url.query) : url.query;
  if (query) result += '?' !== query.charAt(0) ? '?'+ query : query;

  if (url.hash) result += url.hash;

  return result;
}

Url.prototype = { set: set, toString: toString };

//
// Expose the URL parser and some additional properties that might be useful for
// others or testing.
//
Url.extractProtocol = extractProtocol;
Url.location = lolcation;
Url.trimLeft = trimLeft;
Url.qs = qs;

module.exports = Url;

}).call(this)}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})

},{"querystringify":21,"requires-port":22}]},{},[4])(4)
});
//# sourceMappingURL=tus.js.map