@converse/skeletor/dist/skeletor.esm.js

Models and Collections for modern web apps

/** Used for built-in method references. */
var objectProto$l = Object.prototype;

/**
 * Checks if `value` is likely a prototype object.
 *
 * @private
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is a prototype, else `false`.
 */
function isPrototype(value) {
  var Ctor = value && value.constructor,
      proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto$l;

  return value === proto;
}

/**
 * Creates a unary function that invokes `func` with its argument transformed.
 *
 * @private
 * @param {Function} func The function to wrap.
 * @param {Function} transform The argument transform.
 * @returns {Function} Returns the new function.
 */
function overArg(func, transform) {
  return function(arg) {
    return func(transform(arg));
  };
}

/* Built-in method references for those with the same name as other `lodash` methods. */
var nativeKeys = overArg(Object.keys, Object);

/** Used for built-in method references. */
var objectProto$k = Object.prototype;

/** Used to check objects for own properties. */
var hasOwnProperty$h = objectProto$k.hasOwnProperty;

/**
 * The base implementation of `_.keys` which doesn't treat sparse arrays as dense.
 *
 * @private
 * @param {Object} object The object to query.
 * @returns {Array} Returns the array of property names.
 */
function baseKeys(object) {
  if (!isPrototype(object)) {
    return nativeKeys(object);
  }
  var result = [];
  for (var key in Object(object)) {
    if (hasOwnProperty$h.call(object, key) && key != 'constructor') {
      result.push(key);
    }
  }
  return result;
}

/** Detect free variable `global` from Node.js. */
var freeGlobal = typeof global == 'object' && global && global.Object === Object && global;

/** Detect free variable `self`. */
var freeSelf = typeof self == 'object' && self && self.Object === Object && self;

/** Used as a reference to the global object. */
var root$1 = freeGlobal || freeSelf || Function('return this')();

/** Built-in value references. */
var Symbol$1 = root$1.Symbol;

/** Used for built-in method references. */
var objectProto$j = Object.prototype;

/** Used to check objects for own properties. */
var hasOwnProperty$g = objectProto$j.hasOwnProperty;

/**
 * Used to resolve the
 * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
 * of values.
 */
var nativeObjectToString$2 = objectProto$j.toString;

/** Built-in value references. */
var symToStringTag$1 = Symbol$1 ? Symbol$1.toStringTag : undefined;

/**
 * A specialized version of `baseGetTag` which ignores `Symbol.toStringTag` values.
 *
 * @private
 * @param {*} value The value to query.
 * @returns {string} Returns the raw `toStringTag`.
 */
function getRawTag(value) {
  var isOwn = hasOwnProperty$g.call(value, symToStringTag$1),
      tag = value[symToStringTag$1];

  try {
    value[symToStringTag$1] = undefined;
    var unmasked = true;
  } catch (e) {}

  var result = nativeObjectToString$2.call(value);
  if (unmasked) {
    if (isOwn) {
      value[symToStringTag$1] = tag;
    } else {
      delete value[symToStringTag$1];
    }
  }
  return result;
}

/** Used for built-in method references. */
var objectProto$i = Object.prototype;

/**
 * Used to resolve the
 * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
 * of values.
 */
var nativeObjectToString$1 = objectProto$i.toString;

/**
 * Converts `value` to a string using `Object.prototype.toString`.
 *
 * @private
 * @param {*} value The value to convert.
 * @returns {string} Returns the converted string.
 */
function objectToString(value) {
  return nativeObjectToString$1.call(value);
}

/** `Object#toString` result references. */
var nullTag = '[object Null]',
    undefinedTag = '[object Undefined]';

/** Built-in value references. */
var symToStringTag = Symbol$1 ? Symbol$1.toStringTag : undefined;

/**
 * The base implementation of `getTag` without fallbacks for buggy environments.
 *
 * @private
 * @param {*} value The value to query.
 * @returns {string} Returns the `toStringTag`.
 */
function baseGetTag(value) {
  if (value == null) {
    return value === undefined ? undefinedTag : nullTag;
  }
  return (symToStringTag && symToStringTag in Object(value))
    ? getRawTag(value)
    : objectToString(value);
}

/**
 * Checks if `value` is the
 * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)
 * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
 *
 * @static
 * @memberOf _
 * @since 0.1.0
 * @category Lang
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is an object, else `false`.
 * @example
 *
 * _.isObject({});
 * // => true
 *
 * _.isObject([1, 2, 3]);
 * // => true
 *
 * _.isObject(_.noop);
 * // => true
 *
 * _.isObject(null);
 * // => false
 */
function isObject$1(value) {
  var type = typeof value;
  return value != null && (type == 'object' || type == 'function');
}

/** `Object#toString` result references. */
var asyncTag = '[object AsyncFunction]',
    funcTag$2 = '[object Function]',
    genTag$1 = '[object GeneratorFunction]',
    proxyTag = '[object Proxy]';

/**
 * Checks if `value` is classified as a `Function` object.
 *
 * @static
 * @memberOf _
 * @since 0.1.0
 * @category Lang
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is a function, else `false`.
 * @example
 *
 * _.isFunction(_);
 * // => true
 *
 * _.isFunction(/abc/);
 * // => false
 */
function isFunction(value) {
  if (!isObject$1(value)) {
    return false;
  }
  // The use of `Object#toString` avoids issues with the `typeof` operator
  // in Safari 9 which returns 'object' for typed arrays and other constructors.
  var tag = baseGetTag(value);
  return tag == funcTag$2 || tag == genTag$1 || tag == asyncTag || tag == proxyTag;
}

/** Used to detect overreaching core-js shims. */
var coreJsData = root$1['__core-js_shared__'];

/** Used to detect methods masquerading as native. */
var maskSrcKey = (function() {
  var uid = /[^.]+$/.exec(coreJsData && coreJsData.keys && coreJsData.keys.IE_PROTO || '');
  return uid ? ('Symbol(src)_1.' + uid) : '';
}());

/**
 * Checks if `func` has its source masked.
 *
 * @private
 * @param {Function} func The function to check.
 * @returns {boolean} Returns `true` if `func` is masked, else `false`.
 */
function isMasked(func) {
  return !!maskSrcKey && (maskSrcKey in func);
}

/** Used for built-in method references. */
var funcProto$2 = Function.prototype;

/** Used to resolve the decompiled source of functions. */
var funcToString$2 = funcProto$2.toString;

/**
 * Converts `func` to its source code.
 *
 * @private
 * @param {Function} func The function to convert.
 * @returns {string} Returns the source code.
 */
function toSource(func) {
  if (func != null) {
    try {
      return funcToString$2.call(func);
    } catch (e) {}
    try {
      return (func + '');
    } catch (e) {}
  }
  return '';
}

/**
 * Used to match `RegExp`
 * [syntax characters](http://ecma-international.org/ecma-262/7.0/#sec-patterns).
 */
var reRegExpChar = /[\\^$.*+?()[\]{}|]/g;

/** Used to detect host constructors (Safari). */
var reIsHostCtor = /^\[object .+?Constructor\]$/;

/** Used for built-in method references. */
var funcProto$1 = Function.prototype,
    objectProto$h = Object.prototype;

/** Used to resolve the decompiled source of functions. */
var funcToString$1 = funcProto$1.toString;

/** Used to check objects for own properties. */
var hasOwnProperty$f = objectProto$h.hasOwnProperty;

/** Used to detect if a method is native. */
var reIsNative = RegExp('^' +
  funcToString$1.call(hasOwnProperty$f).replace(reRegExpChar, '\\$&')
  .replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$'
);

/**
 * The base implementation of `_.isNative` without bad shim checks.
 *
 * @private
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is a native function,
 *  else `false`.
 */
function baseIsNative(value) {
  if (!isObject$1(value) || isMasked(value)) {
    return false;
  }
  var pattern = isFunction(value) ? reIsNative : reIsHostCtor;
  return pattern.test(toSource(value));
}

/**
 * Gets the value at `key` of `object`.
 *
 * @private
 * @param {Object} [object] The object to query.
 * @param {string} key The key of the property to get.
 * @returns {*} Returns the property value.
 */
function getValue(object, key) {
  return object == null ? undefined : object[key];
}

/**
 * Gets the native function at `key` of `object`.
 *
 * @private
 * @param {Object} object The object to query.
 * @param {string} key The key of the method to get.
 * @returns {*} Returns the function if it's native, else `undefined`.
 */
function getNative(object, key) {
  var value = getValue(object, key);
  return baseIsNative(value) ? value : undefined;
}

/* Built-in method references that are verified to be native. */
var DataView = getNative(root$1, 'DataView');

/* Built-in method references that are verified to be native. */
var Map = getNative(root$1, 'Map');

/* Built-in method references that are verified to be native. */
var Promise$1 = getNative(root$1, 'Promise');

/* Built-in method references that are verified to be native. */
var Set = getNative(root$1, 'Set');

/* Built-in method references that are verified to be native. */
var WeakMap = getNative(root$1, 'WeakMap');

/** `Object#toString` result references. */
var mapTag$6 = '[object Map]',
    objectTag$4 = '[object Object]',
    promiseTag = '[object Promise]',
    setTag$6 = '[object Set]',
    weakMapTag$2 = '[object WeakMap]';

var dataViewTag$4 = '[object DataView]';

/** Used to detect maps, sets, and weakmaps. */
var dataViewCtorString = toSource(DataView),
    mapCtorString = toSource(Map),
    promiseCtorString = toSource(Promise$1),
    setCtorString = toSource(Set),
    weakMapCtorString = toSource(WeakMap);

/**
 * Gets the `toStringTag` of `value`.
 *
 * @private
 * @param {*} value The value to query.
 * @returns {string} Returns the `toStringTag`.
 */
var getTag = baseGetTag;

// Fallback for data views, maps, sets, and weak maps in IE 11 and promises in Node.js < 6.
if ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag$4) ||
    (Map && getTag(new Map) != mapTag$6) ||
    (Promise$1 && getTag(Promise$1.resolve()) != promiseTag) ||
    (Set && getTag(new Set) != setTag$6) ||
    (WeakMap && getTag(new WeakMap) != weakMapTag$2)) {
  getTag = function(value) {
    var result = baseGetTag(value),
        Ctor = result == objectTag$4 ? value.constructor : undefined,
        ctorString = Ctor ? toSource(Ctor) : '';

    if (ctorString) {
      switch (ctorString) {
        case dataViewCtorString: return dataViewTag$4;
        case mapCtorString: return mapTag$6;
        case promiseCtorString: return promiseTag;
        case setCtorString: return setTag$6;
        case weakMapCtorString: return weakMapTag$2;
      }
    }
    return result;
  };
}

/**
 * Checks if `value` is object-like. A value is object-like if it's not `null`
 * and has a `typeof` result of "object".
 *
 * @static
 * @memberOf _
 * @since 4.0.0
 * @category Lang
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is object-like, else `false`.
 * @example
 *
 * _.isObjectLike({});
 * // => true
 *
 * _.isObjectLike([1, 2, 3]);
 * // => true
 *
 * _.isObjectLike(_.noop);
 * // => false
 *
 * _.isObjectLike(null);
 * // => false
 */
function isObjectLike(value) {
  return value != null && typeof value == 'object';
}

/** `Object#toString` result references. */
var argsTag$3 = '[object Arguments]';

/**
 * The base implementation of `_.isArguments`.
 *
 * @private
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is an `arguments` object,
 */
function baseIsArguments(value) {
  return isObjectLike(value) && baseGetTag(value) == argsTag$3;
}

/** Used for built-in method references. */
var objectProto$g = Object.prototype;

/** Used to check objects for own properties. */
var hasOwnProperty$e = objectProto$g.hasOwnProperty;

/** Built-in value references. */
var propertyIsEnumerable$1 = objectProto$g.propertyIsEnumerable;

/**
 * Checks if `value` is likely an `arguments` object.
 *
 * @static
 * @memberOf _
 * @since 0.1.0
 * @category Lang
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is an `arguments` object,
 *  else `false`.
 * @example
 *
 * _.isArguments(function() { return arguments; }());
 * // => true
 *
 * _.isArguments([1, 2, 3]);
 * // => false
 */
var isArguments = baseIsArguments(function() { return arguments; }()) ? baseIsArguments : function(value) {
  return isObjectLike(value) && hasOwnProperty$e.call(value, 'callee') &&
    !propertyIsEnumerable$1.call(value, 'callee');
};

/**
 * Checks if `value` is classified as an `Array` object.
 *
 * @static
 * @memberOf _
 * @since 0.1.0
 * @category Lang
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is an array, else `false`.
 * @example
 *
 * _.isArray([1, 2, 3]);
 * // => true
 *
 * _.isArray(document.body.children);
 * // => false
 *
 * _.isArray('abc');
 * // => false
 *
 * _.isArray(_.noop);
 * // => false
 */
var isArray = Array.isArray;

/** Used as references for various `Number` constants. */
var MAX_SAFE_INTEGER$1 = 9007199254740991;

/**
 * Checks if `value` is a valid array-like length.
 *
 * **Note:** This method is loosely based on
 * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
 *
 * @static
 * @memberOf _
 * @since 4.0.0
 * @category Lang
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
 * @example
 *
 * _.isLength(3);
 * // => true
 *
 * _.isLength(Number.MIN_VALUE);
 * // => false
 *
 * _.isLength(Infinity);
 * // => false
 *
 * _.isLength('3');
 * // => false
 */
function isLength(value) {
  return typeof value == 'number' &&
    value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER$1;
}

/**
 * Checks if `value` is array-like. A value is considered array-like if it's
 * not a function and has a `value.length` that's an integer greater than or
 * equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.
 *
 * @static
 * @memberOf _
 * @since 4.0.0
 * @category Lang
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is array-like, else `false`.
 * @example
 *
 * _.isArrayLike([1, 2, 3]);
 * // => true
 *
 * _.isArrayLike(document.body.children);
 * // => true
 *
 * _.isArrayLike('abc');
 * // => true
 *
 * _.isArrayLike(_.noop);
 * // => false
 */
function isArrayLike(value) {
  return value != null && isLength(value.length) && !isFunction(value);
}

/**
 * This method returns `false`.
 *
 * @static
 * @memberOf _
 * @since 4.13.0
 * @category Util
 * @returns {boolean} Returns `false`.
 * @example
 *
 * _.times(2, _.stubFalse);
 * // => [false, false]
 */
function stubFalse() {
  return false;
}

/** Detect free variable `exports`. */
var freeExports$2 = typeof exports == 'object' && exports && !exports.nodeType && exports;

/** Detect free variable `module`. */
var freeModule$2 = freeExports$2 && typeof module == 'object' && module && !module.nodeType && module;

/** Detect the popular CommonJS extension `module.exports`. */
var moduleExports$2 = freeModule$2 && freeModule$2.exports === freeExports$2;

/** Built-in value references. */
var Buffer$1 = moduleExports$2 ? root$1.Buffer : undefined;

/* Built-in method references for those with the same name as other `lodash` methods. */
var nativeIsBuffer = Buffer$1 ? Buffer$1.isBuffer : undefined;

/**
 * Checks if `value` is a buffer.
 *
 * @static
 * @memberOf _
 * @since 4.3.0
 * @category Lang
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is a buffer, else `false`.
 * @example
 *
 * _.isBuffer(new Buffer(2));
 * // => true
 *
 * _.isBuffer(new Uint8Array(2));
 * // => false
 */
var isBuffer = nativeIsBuffer || stubFalse;

/** `Object#toString` result references. */
var argsTag$2 = '[object Arguments]',
    arrayTag$2 = '[object Array]',
    boolTag$3 = '[object Boolean]',
    dateTag$3 = '[object Date]',
    errorTag$2 = '[object Error]',
    funcTag$1 = '[object Function]',
    mapTag$5 = '[object Map]',
    numberTag$3 = '[object Number]',
    objectTag$3 = '[object Object]',
    regexpTag$3 = '[object RegExp]',
    setTag$5 = '[object Set]',
    stringTag$4 = '[object String]',
    weakMapTag$1 = '[object WeakMap]';

var arrayBufferTag$3 = '[object ArrayBuffer]',
    dataViewTag$3 = '[object DataView]',
    float32Tag$2 = '[object Float32Array]',
    float64Tag$2 = '[object Float64Array]',
    int8Tag$2 = '[object Int8Array]',
    int16Tag$2 = '[object Int16Array]',
    int32Tag$2 = '[object Int32Array]',
    uint8Tag$2 = '[object Uint8Array]',
    uint8ClampedTag$2 = '[object Uint8ClampedArray]',
    uint16Tag$2 = '[object Uint16Array]',
    uint32Tag$2 = '[object Uint32Array]';

/** Used to identify `toStringTag` values of typed arrays. */
var typedArrayTags = {};
typedArrayTags[float32Tag$2] = typedArrayTags[float64Tag$2] =
typedArrayTags[int8Tag$2] = typedArrayTags[int16Tag$2] =
typedArrayTags[int32Tag$2] = typedArrayTags[uint8Tag$2] =
typedArrayTags[uint8ClampedTag$2] = typedArrayTags[uint16Tag$2] =
typedArrayTags[uint32Tag$2] = true;
typedArrayTags[argsTag$2] = typedArrayTags[arrayTag$2] =
typedArrayTags[arrayBufferTag$3] = typedArrayTags[boolTag$3] =
typedArrayTags[dataViewTag$3] = typedArrayTags[dateTag$3] =
typedArrayTags[errorTag$2] = typedArrayTags[funcTag$1] =
typedArrayTags[mapTag$5] = typedArrayTags[numberTag$3] =
typedArrayTags[objectTag$3] = typedArrayTags[regexpTag$3] =
typedArrayTags[setTag$5] = typedArrayTags[stringTag$4] =
typedArrayTags[weakMapTag$1] = false;

/**
 * The base implementation of `_.isTypedArray` without Node.js optimizations.
 *
 * @private
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.
 */
function baseIsTypedArray(value) {
  return isObjectLike(value) &&
    isLength(value.length) && !!typedArrayTags[baseGetTag(value)];
}

/**
 * The base implementation of `_.unary` without support for storing metadata.
 *
 * @private
 * @param {Function} func The function to cap arguments for.
 * @returns {Function} Returns the new capped function.
 */
function baseUnary(func) {
  return function(value) {
    return func(value);
  };
}

/** Detect free variable `exports`. */
var freeExports$1 = typeof exports == 'object' && exports && !exports.nodeType && exports;

/** Detect free variable `module`. */
var freeModule$1 = freeExports$1 && typeof module == 'object' && module && !module.nodeType && module;

/** Detect the popular CommonJS extension `module.exports`. */
var moduleExports$1 = freeModule$1 && freeModule$1.exports === freeExports$1;

/** Detect free variable `process` from Node.js. */
var freeProcess = moduleExports$1 && freeGlobal.process;

/** Used to access faster Node.js helpers. */
var nodeUtil = (function() {
  try {
    // Use `util.types` for Node.js 10+.
    var types = freeModule$1 && freeModule$1.require && freeModule$1.require('util').types;

    if (types) {
      return types;
    }

    // Legacy `process.binding('util')` for Node.js < 10.
    return freeProcess && freeProcess.binding && freeProcess.binding('util');
  } catch (e) {}
}());

/* Node.js helper references. */
var nodeIsTypedArray = nodeUtil && nodeUtil.isTypedArray;

/**
 * Checks if `value` is classified as a typed array.
 *
 * @static
 * @memberOf _
 * @since 3.0.0
 * @category Lang
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.
 * @example
 *
 * _.isTypedArray(new Uint8Array);
 * // => true
 *
 * _.isTypedArray([]);
 * // => false
 */
var isTypedArray = nodeIsTypedArray ? baseUnary(nodeIsTypedArray) : baseIsTypedArray;

/** `Object#toString` result references. */
var mapTag$4 = '[object Map]',
    setTag$4 = '[object Set]';

/** Used for built-in method references. */
var objectProto$f = Object.prototype;

/** Used to check objects for own properties. */
var hasOwnProperty$d = objectProto$f.hasOwnProperty;

/**
 * Checks if `value` is an empty object, collection, map, or set.
 *
 * Objects are considered empty if they have no own enumerable string keyed
 * properties.
 *
 * Array-like values such as `arguments` objects, arrays, buffers, strings, or
 * jQuery-like collections are considered empty if they have a `length` of `0`.
 * Similarly, maps and sets are considered empty if they have a `size` of `0`.
 *
 * @static
 * @memberOf _
 * @since 0.1.0
 * @category Lang
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is empty, else `false`.
 * @example
 *
 * _.isEmpty(null);
 * // => true
 *
 * _.isEmpty(true);
 * // => true
 *
 * _.isEmpty(1);
 * // => true
 *
 * _.isEmpty([1, 2, 3]);
 * // => false
 *
 * _.isEmpty({ 'a': 1 });
 * // => false
 */
function isEmpty(value) {
  if (value == null) {
    return true;
  }
  if (isArrayLike(value) &&
      (isArray(value) || typeof value == 'string' || typeof value.splice == 'function' ||
        isBuffer(value) || isTypedArray(value) || isArguments(value))) {
    return !value.length;
  }
  var tag = getTag(value);
  if (tag == mapTag$4 || tag == setTag$4) {
    return !value.size;
  }
  if (isPrototype(value)) {
    return !baseKeys(value).length;
  }
  for (var key in value) {
    if (hasOwnProperty$d.call(value, key)) {
      return false;
    }
  }
  return true;
}

/**
 * The base implementation of `_.times` without support for iteratee shorthands
 * or max array length checks.
 *
 * @private
 * @param {number} n The number of times to invoke `iteratee`.
 * @param {Function} iteratee The function invoked per iteration.
 * @returns {Array} Returns the array of results.
 */
function baseTimes(n, iteratee) {
  var index = -1,
      result = Array(n);

  while (++index < n) {
    result[index] = iteratee(index);
  }
  return result;
}

/** Used as references for various `Number` constants. */
var MAX_SAFE_INTEGER = 9007199254740991;

/** Used to detect unsigned integer values. */
var reIsUint = /^(?:0|[1-9]\d*)$/;

/**
 * Checks if `value` is a valid array-like index.
 *
 * @private
 * @param {*} value The value to check.
 * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
 * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
 */
function isIndex(value, length) {
  var type = typeof value;
  length = length == null ? MAX_SAFE_INTEGER : length;

  return !!length &&
    (type == 'number' ||
      (type != 'symbol' && reIsUint.test(value))) &&
        (value > -1 && value % 1 == 0 && value < length);
}

/** Used for built-in method references. */
var objectProto$e = Object.prototype;

/** Used to check objects for own properties. */
var hasOwnProperty$c = objectProto$e.hasOwnProperty;

/**
 * Creates an array of the enumerable property names of the array-like `value`.
 *
 * @private
 * @param {*} value The value to query.
 * @param {boolean} inherited Specify returning inherited property names.
 * @returns {Array} Returns the array of property names.
 */
function arrayLikeKeys(value, inherited) {
  var isArr = isArray(value),
      isArg = !isArr && isArguments(value),
      isBuff = !isArr && !isArg && isBuffer(value),
      isType = !isArr && !isArg && !isBuff && isTypedArray(value),
      skipIndexes = isArr || isArg || isBuff || isType,
      result = skipIndexes ? baseTimes(value.length, String) : [],
      length = result.length;

  for (var key in value) {
    if ((inherited || hasOwnProperty$c.call(value, key)) &&
        !(skipIndexes && (
           // Safari 9 has enumerable `arguments.length` in strict mode.
           key == 'length' ||
           // Node.js 0.10 has enumerable non-index properties on buffers.
           (isBuff && (key == 'offset' || key == 'parent')) ||
           // PhantomJS 2 has enumerable non-index properties on typed arrays.
           (isType && (key == 'buffer' || key == 'byteLength' || key == 'byteOffset')) ||
           // Skip index properties.
           isIndex(key, length)
        ))) {
      result.push(key);
    }
  }
  return result;
}

/**
 * Creates an array of the own enumerable property names of `object`.
 *
 * **Note:** Non-object values are coerced to objects. See the
 * [ES spec](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)
 * for more details.
 *
 * @static
 * @since 0.1.0
 * @memberOf _
 * @category Object
 * @param {Object} object The object to query.
 * @returns {Array} Returns the array of property names.
 * @example
 *
 * function Foo() {
 *   this.a = 1;
 *   this.b = 2;
 * }
 *
 * Foo.prototype.c = 3;
 *
 * _.keys(new Foo);
 * // => ['a', 'b'] (iteration order is not guaranteed)
 *
 * _.keys('hi');
 * // => ['0', '1']
 */
function keys$2(object) {
  return isArrayLike(object) ? arrayLikeKeys(object) : baseKeys(object);
}

/**
 * A specialized version of `_.map` for arrays without support for iteratee
 * shorthands.
 *
 * @private
 * @param {Array} [array] The array to iterate over.
 * @param {Function} iteratee The function invoked per iteration.
 * @returns {Array} Returns the new mapped array.
 */
function arrayMap(array, iteratee) {
  var index = -1,
      length = array == null ? 0 : array.length,
      result = Array(length);

  while (++index < length) {
    result[index] = iteratee(array[index], index, array);
  }
  return result;
}

/** `Object#toString` result references. */
var symbolTag$3 = '[object Symbol]';

/**
 * Checks if `value` is classified as a `Symbol` primitive or object.
 *
 * @static
 * @memberOf _
 * @since 4.0.0
 * @category Lang
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is a symbol, else `false`.
 * @example
 *
 * _.isSymbol(Symbol.iterator);
 * // => true
 *
 * _.isSymbol('abc');
 * // => false
 */
function isSymbol(value) {
  return typeof value == 'symbol' ||
    (isObjectLike(value) && baseGetTag(value) == symbolTag$3);
}

/** Used to convert symbols to primitives and strings. */
var symbolProto$2 = Symbol$1 ? Symbol$1.prototype : undefined,
    symbolToString = symbolProto$2 ? symbolProto$2.toString : undefined;

/**
 * The base implementation of `_.toString` which doesn't convert nullish
 * values to empty strings.
 *
 * @private
 * @param {*} value The value to process.
 * @returns {string} Returns the string.
 */
function baseToString(value) {
  // Exit early for strings to avoid a performance hit in some environments.
  if (typeof value == 'string') {
    return value;
  }
  if (isArray(value)) {
    // Recursively convert values (susceptible to call stack limits).
    return arrayMap(value, baseToString) + '';
  }
  if (isSymbol(value)) {
    return symbolToString ? symbolToString.call(value) : '';
  }
  var result = (value + '');
  return (result == '0' && (1 / value) == -Infinity) ? '-0' : result;
}

/**
 * Converts `value` to a string. An empty string is returned for `null`
 * and `undefined` values. The sign of `-0` is preserved.
 *
 * @static
 * @memberOf _
 * @since 4.0.0
 * @category Lang
 * @param {*} value The value to convert.
 * @returns {string} Returns the converted string.
 * @example
 *
 * _.toString(null);
 * // => ''
 *
 * _.toString(-0);
 * // => '-0'
 *
 * _.toString([1, 2, 3]);
 * // => '1,2,3'
 */
function toString$2(value) {
  return value == null ? '' : baseToString(value);
}

/** Used to generate unique IDs. */
var idCounter = 0;

/**
 * Generates a unique ID. If `prefix` is given, the ID is appended to it.
 *
 * @static
 * @since 0.1.0
 * @memberOf _
 * @category Util
 * @param {string} [prefix=''] The value to prefix the ID with.
 * @returns {string} Returns the unique ID.
 * @example
 *
 * _.uniqueId('contact_');
 * // => 'contact_104'
 *
 * _.uniqueId();
 * // => '105'
 */
function uniqueId(prefix) {
  var id = ++idCounter;
  return toString$2(prefix) + id;
}

/** Used to match a single whitespace character. */
var reWhitespace = /\s/;

/**
 * Used by `_.trim` and `_.trimEnd` to get the index of the last non-whitespace
 * character of `string`.
 *
 * @private
 * @param {string} string The string to inspect.
 * @returns {number} Returns the index of the last non-whitespace character.
 */
function trimmedEndIndex(string) {
  var index = string.length;

  while (index-- && reWhitespace.test(string.charAt(index))) {}
  return index;
}

/** Used to match leading whitespace. */
var reTrimStart = /^\s+/;

/**
 * The base implementation of `_.trim`.
 *
 * @private
 * @param {string} string The string to trim.
 * @returns {string} Returns the trimmed string.
 */
function baseTrim(string) {
  return string
    ? string.slice(0, trimmedEndIndex(string) + 1).replace(reTrimStart, '')
    : string;
}

/** Used as references for various `Number` constants. */
var NAN = 0 / 0;

/** Used to detect bad signed hexadecimal string values. */
var reIsBadHex = /^[-+]0x[0-9a-f]+$/i;

/** Used to detect binary string values. */
var reIsBinary = /^0b[01]+$/i;

/** Used to detect octal string values. */
var reIsOctal = /^0o[0-7]+$/i;

/** Built-in method references without a dependency on `root`. */
var freeParseInt = parseInt;

/**
 * Converts `value` to a number.
 *
 * @static
 * @memberOf _
 * @since 4.0.0
 * @category Lang
 * @param {*} value The value to process.
 * @returns {number} Returns the number.
 * @example
 *
 * _.toNumber(3.2);
 * // => 3.2
 *
 * _.toNumber(Number.MIN_VALUE);
 * // => 5e-324
 *
 * _.toNumber(Infinity);
 * // => Infinity
 *
 * _.toNumber('3.2');
 * // => 3.2
 */
function toNumber$1(value) {
  if (typeof value == 'number') {
    return value;
  }
  if (isSymbol(value)) {
    return NAN;
  }
  if (isObject$1(value)) {
    var other = typeof value.valueOf == 'function' ? value.valueOf() : value;
    value = isObject$1(other) ? (other + '') : other;
  }
  if (typeof value != 'string') {
    return value === 0 ? value : +value;
  }
  value = baseTrim(value);
  var isBinary = reIsBinary.test(value);
  return (isBinary || reIsOctal.test(value))
    ? freeParseInt(value.slice(2), isBinary ? 2 : 8)
    : (reIsBadHex.test(value) ? NAN : +value);
}

/** Used as references for various `Number` constants. */
var INFINITY = 1 / 0,
    MAX_INTEGER = 1.7976931348623157e+308;

/**
 * Converts `value` to a finite number.
 *
 * @static
 * @memberOf _
 * @since 4.12.0
 * @category Lang
 * @param {*} value The value to convert.
 * @returns {number} Returns the converted number.
 * @example
 *
 * _.toFinite(3.2);
 * // => 3.2
 *
 * _.toFinite(Number.MIN_VALUE);
 * // => 5e-324
 *
 * _.toFinite(Infinity);
 * // => 1.7976931348623157e+308
 *
 * _.toFinite('3.2');
 * // => 3.2
 */
function toFinite(value) {
  if (!value) {
    return value === 0 ? value : 0;
  }
  value = toNumber$1(value);
  if (value === INFINITY || value === -INFINITY) {
    var sign = (value < 0 ? -1 : 1);
    return sign * MAX_INTEGER;
  }
  return value === value ? value : 0;
}

/**
 * Converts `value` to an integer.
 *
 * **Note:** This method is loosely based on
 * [`ToInteger`](http://www.ecma-international.org/ecma-262/7.0/#sec-tointeger).
 *
 * @static
 * @memberOf _
 * @since 4.0.0
 * @category Lang
 * @param {*} value The value to convert.
 * @returns {number} Returns the converted integer.
 * @example
 *
 * _.toInteger(3.2);
 * // => 3
 *
 * _.toInteger(Number.MIN_VALUE);
 * // => 0
 *
 * _.toInteger(Infinity);
 * // => 1.7976931348623157e+308
 *
 * _.toInteger('3.2');
 * // => 3
 */
function toInteger(value) {
  var result = toFinite(value),
      remainder = result % 1;

  return result === result ? (remainder ? result - remainder : result) : 0;
}

/** Error message constants. */
var FUNC_ERROR_TEXT$3 = 'Expected a function';

/**
 * Creates a function that invokes `func`, with the `this` binding and arguments
 * of the created function, while it's called less than `n` times. Subsequent
 * calls to the created function return the result of the last `func` invocation.
 *
 * @static
 * @memberOf _
 * @since 3.0.0
 * @category Function
 * @param {number} n The number of calls at which `func` is no longer invoked.
 * @param {Function} func The function to restrict.
 * @returns {Function} Returns the new restricted function.
 * @example
 *
 * jQuery(element).on('click', _.before(5, addContactToList));
 * // => Allows adding up to 4 contacts to the list.
 */
function before(n, func) {
  var result;
  if (typeof func != 'function') {
    throw new TypeError(FUNC_ERROR_TEXT$3);
  }
  n = toInteger(n);
  return function() {
    if (--n > 0) {
      result = func.apply(this, arguments);
    }
    if (n <= 1) {
      func = undefined;
    }
    return result;
  };
}

/**
 * Creates a function that is restricted to invoking `func` once. Repeat calls
 * to the function return the value of the first invocation. The `func` is
 * invoked with the `this` binding and arguments of the created function.
 *
 * @static
 * @memberOf _
 * @since 0.1.0
 * @category Function
 * @param {Function} func The function to restrict.
 * @returns {Function} Returns the new restricted function.
 * @example
 *
 * var initialize = _.once(createApplication);
 * initialize();
 * initialize();
 * // => `createApplication` is invoked once
 */
function once(func) {
  return before(2, func);
}

// Regular expression used to split event strings.
const eventSplitter = /\s+/;
/**
 * Iterates over the standard `event, callback` (as well as the fancy multiple
 * space-separated events `"change blur", callback` and jQuery-style event
 * maps `{event: callback}`).
 */
function eventsApi(iteratee, events, name, callback, opts) {
    let i = 0;
    let names;
    if (name && typeof name === 'object') {
        // Handle event maps.
        if (callback !== undefined && 'context' in opts && opts.context === undefined) {
            opts.context = callback;
        }
        for (names = Object.keys(name); i < names.length; i++) {
            events = eventsApi(iteratee, events, names[i], name[names[i]], opts);
        }
    }
    else if (name && typeof name === 'string' && eventSplitter.test(name)) {
        // Handle space-separated event names by delegating them individually.
        for (names = name.split(eventSplitter); i < names.length; i++) {
            const result = iteratee(events, names[i], callback, opts);
            if (result !== undefined) {
                events = result;
            }
        }
    }
    else {
        // Finally, standard events.
        events = iteratee(events, name, callback, opts);
    }
    return events;
}
/**
 * A reducer that adds a callback to the `events` object.
 */
function onApi(events, name, callback, options) {
    if (callback) {
        const handlers = events[name] || (events[name] = []);
        const context = options.context;
        const ctx = options.ctx;
        const listening = options.listening;
        if (listening)
            listening.count++;
        handlers.push({ callback, context, ctx: context || ctx, listening });
    }
    return events;
}
/**
 * An try-catch guarded #on function, to prevent poisoning the global
 * `_listening` variable.
 */
function tryCatchOn(obj, name, callback, context) {
    try {
        obj.on(name, callback, context);
    }
    catch (e) {
        return e;
    }
}
/**
 * The reducing API that removes a callback from the `events` object.
 */
function offApi(events, name, callback, options) {
    if (!events)
        return;
    const context = options.context;
    const listeners = options.listeners;
    let i = 0;
    let names;
    // Delete all event listeners and "drop" events.
    if (!name && !context && !callback) {
        if (listeners) {
            for (names = Object.keys(listeners); i < names.length; i++) {
                listeners[names[i]].cleanup();
            }
        }
        return;
    }
    names = name ? [name] : Object.keys(events);
    for (; i < names.length; i++) {
        const currentName = names[i];
        const handlers = events[currentName];
        // Bail out if there are no events stored.
        if (!handlers) {
            continue;
        }
        // Find any remaining events.
        const remaining = [];
        for (let j = 0; j < handlers.length; j++) {
            const handler = handlers[j];
            if ((callback && callback !== handler.callback && callback !== handler.callback._callback) ||
                (context && context !== handler.context)) {
                remaining.push(handler);
            }
            else {
                const listening = handler.listening;
                if (listening)
                    listening.stop(currentName, callback);
            }
        }
        // Replace events if there are any remaining.  Otherwise, clean up.
        if (remaining.length) {
            events[currentName] = remaining;
        }
        else {
            delete events[currentName];
        }
    }
    return events;
}
/**
 * Reduces the event callbacks into a map of `{event: onceWrapper}`.
 * `offer` unbinds the `onceWrapper` after it has been called.
 */
function onceMap(map, name, callback, offer) {
    if (callback) {
        const _once = once(function (...args) {
            offer(name, _once);
            callback.apply(this, args);
        });
        map[name] = _once;
        _once._callback = callback;
    }
    return map;
}
/** Handles triggering the appropriate event callbacks. */
function triggerApi(objEvents, name, _callback, args) {
    if (objEvents) {
        const events = objEvents[name];
        let allEvents = objEvents.all;
        if (events && allEvents)
            allEvents = allEvents.slice();
        if (events)
            triggerEvents(events, args);
        if (allEvents)
            triggerEvents(allEvents, [name].concat(args));
    }
    return objEvents;
}
/**
 * A difficult-to-believe, but optimized internal dispatch function for
 * triggering events. Tries to keep the usual cases speedy (most internal
 * Backbone events have 3 arguments).
 */
function triggerEvents(events, args) {
    let ev;
    let i = -1;
    const l = events.length;
    const a1 = args[0];
    const a2 = args[1];
    const a3 = args[2];
    switch (args.length) {
        case 0:
            while (++i < l)
                (ev = events[i]).callback.call(ev.ctx);
            return;
        case 1:
            while (++i < l)
                (ev = events[i]).callback.call(ev.ctx, a1);
            return;
        case 2:
            while (++i < l)
                (ev = events[i]).callback.call(ev.ctx, a1, a2);
            return;
        case 3:
            while (++i < l)
                (ev = events[i]).callback.call(ev.ctx, a1, a2, a3);
            return;
        default:
            while (++i < l)
                (ev = events[i]).callback.apply(ev.ctx, args);
            return;
    }
}

/**
 * A listening class that tracks and cleans up memory bindings
 * when all callbacks have been offed.
 */
class Listening {
    constructor(listener, obj) {
        this.id = listener._listenId;
        this.listener = listener;
        this.obj = obj;
        this.interop = true;
        this.count = 0;
        this._events = undefined;
    }
    start(name, callback, context, _listening) {
        const options = {
            context: this.obj,
            ctx: context,
            listening: _listening,
        };
        this._events = eventsApi(onApi, this._events || {}, name, callback, options);
        if (_listening) {
            const listeners = this.obj._listeners || (this.obj._listeners = {});
            listeners[this.id] = this;
            // Allow the listening to use a counter, instead of tracking
            // callbacks for library interop
            this.interop = false;
        }
        return this;
    }
    /**
     * Stop's listening to a callback (or several).
     * Uses an optimized counter if the listenee uses Backbone.Events.
     * Otherwise, falls back to manual tracking to support events
     * library interop.
     */
    stop(name, callback) {
        let cleanup;
        if (this.interop) {
            this._events = eventsApi(offApi, this._events, name, callback, {
                context: undefined,
                listeners: undefined,
            });
            cleanup = !this._events;
        }
        else {
            this.count--;
            cleanup = this.count === 0;
        }
        if (cleanup)
            this.cleanup();
    }
    /**
     * Cleans up memory bindings between the listener and the listenee.
     */
    cleanup() {
        if (this.listener._listeningTo) {
            delete this.listener._listeningTo[this.obj._listenId];
        }
        if (!this.interop && this.obj._listeners) {
            delete this.obj._listeners[this.id];
        }
    }
}

/**
 * @copyright 2010-2019 Jeremy Ashkenas and DocumentCloud
 * @copyright 2023 JC Brand
 */
// A private global variable to share between listeners and listenees.
let _listening;
/**
 * @public
 */
function EventEmitter(Base) {
    return class EventEmitter extends Base {
        /**
         * Bind an event to a `callback` function. Passing `"all"` will bind
         * the callback to all events fired.
         */
        on(name, callback, context) {
            this._events = eventsApi(onApi, this._events || {}, name, callback, {
                context: context,
                ctx: this,
                listening: _listening,
            });
            if (_listening) {
                const listeners = this._listeners || (this._listeners = {});
                listeners[_listening.id] = _listening;
                // Allow the listening to use a counter, instead of tracking
                // callbacks for library interop
                _listening.interop = false;
            }
            return this;
        }
        /**
         * Inversion-of-control versions of `on`. Tell *this* object to listen to
         * an event in another object... keeping track of what it's listening to
         * for easier unbinding later.
         */
        listenTo(obj, name, callback) {
            if (!obj)
                return this;
            const id = obj._listenId || (obj._listenId = uniqueId('l'));
            const listeningTo = this._listeningTo || (this._listeningTo = {});
            let listening = (_listening = listeningTo[id]);
            // This object is not listening to any other events on `obj` yet.
            // Setup the necessary references to track the listening callbacks.
            if (!listening) {
                this._listenId || (this._listenId = uniqueId('l'));
                listening = _listening = listeningTo[id] = new Listening(this, obj);
            }
            // Bind callbacks on obj.
            const error = tryCatchOn(obj, name, callback, this);
            _listening = undefined;
            if (error)
                throw error;
            // If the target obj is not Backbone.Events, track events manually.
            if (listening.interop)
                listening.start(name, callback, this, _listening);
            return this;
        }
        /**
         * Remove one or many callbacks. If `context` is null, removes all
         * callbacks with that function. If `callback` is null, removes all
         * callbacks for the event. If `name` is null, removes all bound
         * callbacks for all events.
         */
        off(name, callback, context) {
            if (!this._events)
                return this;
            this._events = eventsApi(offApi, this._events, name, callback, {
                context: context,
                listeners: this._listeners,
            });
            return this;
        }
        /**
         * Tell this object to stop listening to either specific events ... or
         * to every object it's currently listening to.
         */
        stopListening(obj, name, callback) {
            const listeningTo = this._listeningTo;
            if (!listeningTo)
                return this;
            const ids = obj ? [obj._listenId] : keys$2(listeningTo);
            for (let i = 0; i < ids.length; i++) {
                const listening = listeningTo[ids[i]];
                // If listening doesn't exist, this object is not currently
                // listening to obj. Break out early.
                if (!listening)
                    break;
                listening.obj.off(name, callback, this);
                if (listening.interop)
                    listening.stop(name, callback);
            }
            if (isEmpty(listeningTo))
                this._listeningTo = undefined;
            return this;
        }
        /**
         * Bind an event to only be triggered a single time. After the first time
         * the callback is invoked, its listener will be removed. If multiple events
         * are passed in using the space-separated syntax, the handler will fire
         * once for each event, not once for a combination of all events.
         */
        once(name, callback, context) {
            // Map the event into a `{event: once}` object.
            const events = eventsApi(onceMap, {}, name, callback, this.off.bind(this));
            if (typeof name === 'string' && (context === null || context === undefined))
                callback = undefined;
            return this.on(events, callback, context);
        }
        /**
         * Inversion-of-control versions of `once`.
         */
        listenToOnce(obj, name, callback) {
            // Map the event into a `{event: once}` object.
            const events = eventsApi(onceMap, {}, name, callback, this.stopListening.bind(this, obj));
            return this.listenTo(obj, events);
        }
        /**
         * Trigger one or many events, firing all bound callbacks. Callbacks are
         * passed the same arguments as `trigger` is, apart from the event name
         * (unless you're listening on `"all"`, which will cause your callback to
         * receive the true name of the event as the first argument).
         */
        trigger(name, ...args) {
            if (!this._events)
                return this;
            eventsApi(triggerApi, this._events, name, undefined, args);
            return this;
        }
    };
}
/**
 * @public
 */
const EventEmitterObject = EventEmitter(Object);

/*! *****************************************************************************
Copyright (c) Microsoft Corporation.

Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.
***************************************************************************** */
/* global Reflect, Promise */


function __values(o) {
    var s = typeof Symbol === "function" && Symbol.iterator, m = s && o[s], i = 0;
    if (m) return m.call(o);
    if (o && typeof o.length === "number") return {
        next: function () {
            if (o && i >= o.length) o = void 0;
            return { value: o && o[i++], done: !o };
        }
    };
    throw new TypeError(s ? "Object is not iterable." : "Symbol.iterator is not defined.");
}

/*!
MIT License

Copyright (c) 2018 Arturas Molcanovas <a.molcanovas@gmail.com>

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

*/


/**
 * Abstracts constructing a Blob object, so it also works in older
 * browsers that don't support the native Blob constructor. (i.e.
 * old QtWebKit versions, at least).
 * Abstracts constructing a Blob object, so it also works in older
 * browsers that don't support the native Blob constructor. (i.e.
 * old QtWebKit versions, at least).
 *
 * @param parts
 * @param properties
 */
function createBlob$1(parts, properties) {
    /* global BlobBuilder,MSBlobBuilder,MozBlobBuilder,WebKitBlobBuilder */
    parts = parts || [];
    properties = properties || {};
    try {
        return new Blob(parts, properties);
    }
    catch (e) {
        if (e.name !== 'TypeError') {
            throw e;
        }
        //tslint:disable-next-line:variable-name
        var Builder = typeof BlobBuilder !== 'undefined' ? BlobBuilder
            : typeof MSBlobBuilder