pdf-lib/dist/pdf-lib.js

Library for creating and modifying PDF files in JavaScript

(function (global, factory) {
	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
	typeof define === 'function' && define.amd ? define(['exports'], factory) :
	factory(global.PDFLib = {});
}(typeof self !== 'undefined' ? self : this, function (exports) {
	var commonjsGlobal = typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {};

	function createCommonjsModule(fn, module) {
		return module = { exports: {} }, fn(module, module.exports), module.exports;
	}

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

	var _freeGlobal = freeGlobal;

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

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

	var _root = root;

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

	var _Symbol = Symbol$1;

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

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

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

	/** Built-in value references. */
	var symToStringTag = _Symbol ? _Symbol.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.call(value, symToStringTag),
	      tag = value[symToStringTag];

	  try {
	    value[symToStringTag] = undefined;
	  } catch (e) {}

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

	var _getRawTag = getRawTag;

	/** Used for built-in method references. */
	var objectProto$1 = 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$1.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);
	}

	var _objectToString = objectToString;

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

	/** Built-in value references. */
	var symToStringTag$1 = _Symbol ? _Symbol.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$1 && symToStringTag$1 in Object(value))
	    ? _getRawTag(value)
	    : _objectToString(value);
	}

	var _baseGetTag = baseGetTag;

	/**
	 * 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';
	}

	var isObjectLike_1 = isObjectLike;

	/** `Object#toString` result references. */
	var numberTag = '[object Number]';

	/**
	 * Checks if `value` is classified as a `Number` primitive or object.
	 *
	 * **Note:** To exclude `Infinity`, `-Infinity`, and `NaN`, which are
	 * classified as numbers, use the `_.isFinite` method.
	 *
	 * @static
	 * @memberOf _
	 * @since 0.1.0
	 * @category Lang
	 * @param {*} value The value to check.
	 * @returns {boolean} Returns `true` if `value` is a number, else `false`.
	 * @example
	 *
	 * _.isNumber(3);
	 * // => true
	 *
	 * _.isNumber(Number.MIN_VALUE);
	 * // => true
	 *
	 * _.isNumber(Infinity);
	 * // => true
	 *
	 * _.isNumber('3');
	 * // => false
	 */
	function isNumber(value) {
	  return typeof value == 'number' ||
	    (isObjectLike_1(value) && _baseGetTag(value) == numberTag);
	}

	var isNumber_1 = isNumber;

	/**
	 * 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;
	}

	var _arrayMap = arrayMap;

	/**
	 * The base implementation of `_.values` and `_.valuesIn` which creates an
	 * array of `object` property values corresponding to the property names
	 * of `props`.
	 *
	 * @private
	 * @param {Object} object The object to query.
	 * @param {Array} props The property names to get values for.
	 * @returns {Object} Returns the array of property values.
	 */
	function baseValues(object, props) {
	  return _arrayMap(props, function(key) {
	    return object[key];
	  });
	}

	var _baseValues = baseValues;

	/**
	 * 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;
	}

	var _baseTimes = baseTimes;

	/** `Object#toString` result references. */
	var argsTag = '[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_1(value) && _baseGetTag(value) == argsTag;
	}

	var _baseIsArguments = baseIsArguments;

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

	/** Used to check objects for own properties. */
	var hasOwnProperty$1 = objectProto$2.hasOwnProperty;

	/** Built-in value references. */
	var propertyIsEnumerable = objectProto$2.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_1(value) && hasOwnProperty$1.call(value, 'callee') &&
	    !propertyIsEnumerable.call(value, 'callee');
	};

	var isArguments_1 = isArguments;

	/**
	 * 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;

	var isArray_1 = isArray;

	/**
	 * 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;
	}

	var stubFalse_1 = stubFalse;

	var isBuffer_1 = createCommonjsModule(function (module, exports) {
	/** Detect free variable `exports`. */
	var freeExports = exports && !exports.nodeType && exports;

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

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

	/** Built-in value references. */
	var Buffer = moduleExports ? _root.Buffer : undefined;

	/* Built-in method references for those with the same name as other `lodash` methods. */
	var nativeIsBuffer = Buffer ? Buffer.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_1;

	module.exports = isBuffer;
	});

	/** 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) {
	  length = length == null ? MAX_SAFE_INTEGER : length;
	  return !!length &&
	    (typeof value == 'number' || reIsUint.test(value)) &&
	    (value > -1 && value % 1 == 0 && value < length);
	}

	var _isIndex = isIndex;

	/** 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;
	}

	var isLength_1 = isLength;

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

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

	/** Used to identify `toStringTag` values of typed arrays. */
	var typedArrayTags = {};
	typedArrayTags[float32Tag] = typedArrayTags[float64Tag] =
	typedArrayTags[int8Tag] = typedArrayTags[int16Tag] =
	typedArrayTags[int32Tag] = typedArrayTags[uint8Tag] =
	typedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] =
	typedArrayTags[uint32Tag] = true;
	typedArrayTags[argsTag$1] = typedArrayTags[arrayTag] =
	typedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] =
	typedArrayTags[dataViewTag] = typedArrayTags[dateTag] =
	typedArrayTags[errorTag] = typedArrayTags[funcTag] =
	typedArrayTags[mapTag] = typedArrayTags[numberTag$1] =
	typedArrayTags[objectTag] = typedArrayTags[regexpTag] =
	typedArrayTags[setTag] = typedArrayTags[stringTag] =
	typedArrayTags[weakMapTag] = 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_1(value) &&
	    isLength_1(value.length) && !!typedArrayTags[_baseGetTag(value)];
	}

	var _baseIsTypedArray = baseIsTypedArray;

	/**
	 * 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);
	  };
	}

	var _baseUnary = baseUnary;

	var _nodeUtil = createCommonjsModule(function (module, exports) {
	/** Detect free variable `exports`. */
	var freeExports = exports && !exports.nodeType && exports;

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

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

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

	/** Used to access faster Node.js helpers. */
	var nodeUtil = (function() {
	  try {
	    return freeProcess && freeProcess.binding && freeProcess.binding('util');
	  } catch (e) {}
	}());

	module.exports = nodeUtil;
	});

	/* 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;

	var isTypedArray_1 = isTypedArray;

	/** Used for built-in method references. */
	var objectProto$3 = Object.prototype;

	/** Used to check objects for own properties. */
	var hasOwnProperty$2 = objectProto$3.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_1(value),
	      isArg = !isArr && isArguments_1(value),
	      isBuff = !isArr && !isArg && isBuffer_1(value),
	      isType = !isArr && !isArg && !isBuff && isTypedArray_1(value),
	      skipIndexes = isArr || isArg || isBuff || isType,
	      result = skipIndexes ? _baseTimes(value.length, String) : [],
	      length = result.length;

	  for (var key in value) {
	    if ((inherited || hasOwnProperty$2.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;
	}

	var _arrayLikeKeys = arrayLikeKeys;

	/** Used for built-in method references. */
	var objectProto$4 = 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$4;

	  return value === proto;
	}

	var _isPrototype = isPrototype;

	/**
	 * 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));
	  };
	}

	var _overArg = overArg;

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

	var _nativeKeys = nativeKeys;

	/** Used for built-in method references. */
	var objectProto$5 = Object.prototype;

	/** Used to check objects for own properties. */
	var hasOwnProperty$3 = objectProto$5.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$3.call(object, key) && key != 'constructor') {
	      result.push(key);
	    }
	  }
	  return result;
	}

	var _baseKeys = baseKeys;

	/**
	 * 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(value) {
	  var type = typeof value;
	  return value != null && (type == 'object' || type == 'function');
	}

	var isObject_1 = isObject;

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

	var isFunction_1 = isFunction;

	/**
	 * 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_1(value.length) && !isFunction_1(value);
	}

	var isArrayLike_1 = isArrayLike;

	/**
	 * 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(object) {
	  return isArrayLike_1(object) ? _arrayLikeKeys(object) : _baseKeys(object);
	}

	var keys_1 = keys;

	/**
	 * Creates an array of the own enumerable string keyed property values of `object`.
	 *
	 * **Note:** Non-object values are coerced to objects.
	 *
	 * @static
	 * @since 0.1.0
	 * @memberOf _
	 * @category Object
	 * @param {Object} object The object to query.
	 * @returns {Array} Returns the array of property values.
	 * @example
	 *
	 * function Foo() {
	 *   this.a = 1;
	 *   this.b = 2;
	 * }
	 *
	 * Foo.prototype.c = 3;
	 *
	 * _.values(new Foo);
	 * // => [1, 2] (iteration order is not guaranteed)
	 *
	 * _.values('hi');
	 * // => ['h', 'i']
	 */
	function values(object) {
	  return object == null ? [] : _baseValues(object, keys_1(object));
	}

	var values_1 = values;

	var base64Arraybuffer = createCommonjsModule(function (module, exports) {
	/*
	 * base64-arraybuffer
	 * https://github.com/niklasvh/base64-arraybuffer
	 *
	 * Copyright (c) 2012 Niklas von Hertzen
	 * Licensed under the MIT license.
	 */
	(function(){

	  var chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

	  // Use a lookup table to find the index.
	  var lookup = new Uint8Array(256);
	  for (var i = 0; i < chars.length; i++) {
	    lookup[chars.charCodeAt(i)] = i;
	  }

	  exports.encode = function(arraybuffer) {
	    var bytes = new Uint8Array(arraybuffer),
	    i, len = bytes.length, base64 = "";

	    for (i = 0; i < len; i+=3) {
	      base64 += chars[bytes[i] >> 2];
	      base64 += chars[((bytes[i] & 3) << 4) | (bytes[i + 1] >> 4)];
	      base64 += chars[((bytes[i + 1] & 15) << 2) | (bytes[i + 2] >> 6)];
	      base64 += chars[bytes[i + 2] & 63];
	    }

	    if ((len % 3) === 2) {
	      base64 = base64.substring(0, base64.length - 1) + "=";
	    } else if (len % 3 === 1) {
	      base64 = base64.substring(0, base64.length - 2) + "==";
	    }

	    return base64;
	  };

	  exports.decode =  function(base64) {
	    var bufferLength = base64.length * 0.75,
	    len = base64.length, i, p = 0,
	    encoded1, encoded2, encoded3, encoded4;

	    if (base64[base64.length - 1] === "=") {
	      bufferLength--;
	      if (base64[base64.length - 2] === "=") {
	        bufferLength--;
	      }
	    }

	    var arraybuffer = new ArrayBuffer(bufferLength),
	    bytes = new Uint8Array(arraybuffer);

	    for (i = 0; i < len; i+=4) {
	      encoded1 = lookup[base64.charCodeAt(i)];
	      encoded2 = lookup[base64.charCodeAt(i+1)];
	      encoded3 = lookup[base64.charCodeAt(i+2)];
	      encoded4 = lookup[base64.charCodeAt(i+3)];

	      bytes[p++] = (encoded1 << 2) | (encoded2 >> 4);
	      bytes[p++] = ((encoded2 & 15) << 4) | (encoded3 >> 2);
	      bytes[p++] = ((encoded3 & 3) << 6) | (encoded4 & 63);
	    }

	    return arraybuffer;
	  };
	})();
	});
	var base64Arraybuffer_1 = base64Arraybuffer.encode;
	var base64Arraybuffer_2 = base64Arraybuffer.decode;

	var common = createCommonjsModule(function (module, exports) {


	var TYPED_OK =  (typeof Uint8Array !== 'undefined') &&
	                (typeof Uint16Array !== 'undefined') &&
	                (typeof Int32Array !== 'undefined');

	function _has(obj, key) {
	  return Object.prototype.hasOwnProperty.call(obj, key);
	}

	exports.assign = function (obj /*from1, from2, from3, ...*/) {
	  var sources = Array.prototype.slice.call(arguments, 1);
	  while (sources.length) {
	    var source = sources.shift();
	    if (!source) { continue; }

	    if (typeof source !== 'object') {
	      throw new TypeError(source + 'must be non-object');
	    }

	    for (var p in source) {
	      if (_has(source, p)) {
	        obj[p] = source[p];
	      }
	    }
	  }

	  return obj;
	};


	// reduce buffer size, avoiding mem copy
	exports.shrinkBuf = function (buf, size) {
	  if (buf.length === size) { return buf; }
	  if (buf.subarray) { return buf.subarray(0, size); }
	  buf.length = size;
	  return buf;
	};


	var fnTyped = {
	  arraySet: function (dest, src, src_offs, len, dest_offs) {
	    if (src.subarray && dest.subarray) {
	      dest.set(src.subarray(src_offs, src_offs + len), dest_offs);
	      return;
	    }
	    // Fallback to ordinary array
	    for (var i = 0; i < len; i++) {
	      dest[dest_offs + i] = src[src_offs + i];
	    }
	  },
	  // Join array of chunks to single array.
	  flattenChunks: function (chunks) {
	    var i, l, len, pos, chunk, result;

	    // calculate data length
	    len = 0;
	    for (i = 0, l = chunks.length; i < l; i++) {
	      len += chunks[i].length;
	    }

	    // join chunks
	    result = new Uint8Array(len);
	    pos = 0;
	    for (i = 0, l = chunks.length; i < l; i++) {
	      chunk = chunks[i];
	      result.set(chunk, pos);
	      pos += chunk.length;
	    }

	    return result;
	  }
	};

	var fnUntyped = {
	  arraySet: function (dest, src, src_offs, len, dest_offs) {
	    for (var i = 0; i < len; i++) {
	      dest[dest_offs + i] = src[src_offs + i];
	    }
	  },
	  // Join array of chunks to single array.
	  flattenChunks: function (chunks) {
	    return [].concat.apply([], chunks);
	  }
	};


	// Enable/Disable typed arrays use, for testing
	//
	exports.setTyped = function (on) {
	  if (on) {
	    exports.Buf8  = Uint8Array;
	    exports.Buf16 = Uint16Array;
	    exports.Buf32 = Int32Array;
	    exports.assign(exports, fnTyped);
	  } else {
	    exports.Buf8  = Array;
	    exports.Buf16 = Array;
	    exports.Buf32 = Array;
	    exports.assign(exports, fnUntyped);
	  }
	};

	exports.setTyped(TYPED_OK);
	});
	var common_1 = common.assign;
	var common_2 = common.shrinkBuf;
	var common_3 = common.setTyped;
	var common_4 = common.Buf8;
	var common_5 = common.Buf16;
	var common_6 = common.Buf32;

	// (C) 1995-2013 Jean-loup Gailly and Mark Adler
	// (C) 2014-2017 Vitaly Puzrin and Andrey Tupitsin
	//
	// This software is provided 'as-is', without any express or implied
	// warranty. In no event will the authors be held liable for any damages
	// arising from the use of this software.
	//
	// Permission is granted to anyone to use this software for any purpose,
	// including commercial applications, and to alter it and redistribute it
	// freely, subject to the following restrictions:
	//
	// 1. The origin of this software must not be misrepresented; you must not
	//   claim that you wrote the original software. If you use this software
	//   in a product, an acknowledgment in the product documentation would be
	//   appreciated but is not required.
	// 2. Altered source versions must be plainly marked as such, and must not be
	//   misrepresented as being the original software.
	// 3. This notice may not be removed or altered from any source distribution.



	/* Public constants ==========================================================*/
	/* ===========================================================================*/


	//var Z_FILTERED          = 1;
	//var Z_HUFFMAN_ONLY      = 2;
	//var Z_RLE               = 3;
	var Z_FIXED               = 4;
	//var Z_DEFAULT_STRATEGY  = 0;

	/* Possible values of the data_type field (though see inflate()) */
	var Z_BINARY              = 0;
	var Z_TEXT                = 1;
	//var Z_ASCII             = 1; // = Z_TEXT
	var Z_UNKNOWN             = 2;

	/*============================================================================*/


	function zero(buf) { var len = buf.length; while (--len >= 0) { buf[len] = 0; } }

	// From zutil.h

	var STORED_BLOCK = 0;
	var STATIC_TREES = 1;
	var DYN_TREES    = 2;
	/* The three kinds of block type */

	var MIN_MATCH    = 3;
	var MAX_MATCH    = 258;
	/* The minimum and maximum match lengths */

	// From deflate.h
	/* ===========================================================================
	 * Internal compression state.
	 */

	var LENGTH_CODES  = 29;
	/* number of length codes, not counting the special END_BLOCK code */

	var LITERALS      = 256;
	/* number of literal bytes 0..255 */

	var L_CODES       = LITERALS + 1 + LENGTH_CODES;
	/* number of Literal or Length codes, including the END_BLOCK code */

	var D_CODES       = 30;
	/* number of distance codes */

	var BL_CODES      = 19;
	/* number of codes used to transfer the bit lengths */

	var HEAP_SIZE     = 2 * L_CODES + 1;
	/* maximum heap size */

	var MAX_BITS      = 15;
	/* All codes must not exceed MAX_BITS bits */

	var Buf_size      = 16;
	/* size of bit buffer in bi_buf */


	/* ===========================================================================
	 * Constants
	 */

	var MAX_BL_BITS = 7;
	/* Bit length codes must not exceed MAX_BL_BITS bits */

	var END_BLOCK   = 256;
	/* end of block literal code */

	var REP_3_6     = 16;
	/* repeat previous bit length 3-6 times (2 bits of repeat count) */

	var REPZ_3_10   = 17;
	/* repeat a zero length 3-10 times  (3 bits of repeat count) */

	var REPZ_11_138 = 18;
	/* repeat a zero length 11-138 times  (7 bits of repeat count) */

	/* eslint-disable comma-spacing,array-bracket-spacing */
	var extra_lbits =   /* extra bits for each length code */
	  [0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0];

	var extra_dbits =   /* extra bits for each distance code */
	  [0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13];

	var extra_blbits =  /* extra bits for each bit length code */
	  [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,3,7];

	var bl_order =
	  [16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15];
	/* eslint-enable comma-spacing,array-bracket-spacing */

	/* The lengths of the bit length codes are sent in order of decreasing
	 * probability, to avoid transmitting the lengths for unused bit length codes.
	 */

	/* ===========================================================================
	 * Local data. These are initialized only once.
	 */

	// We pre-fill arrays with 0 to avoid uninitialized gaps

	var DIST_CODE_LEN = 512; /* see definition of array dist_code below */

	// !!!! Use flat array instead of structure, Freq = i*2, Len = i*2+1
	var static_ltree  = new Array((L_CODES + 2) * 2);
	zero(static_ltree);
	/* The static literal tree. Since the bit lengths are imposed, there is no
	 * need for the L_CODES extra codes used during heap construction. However
	 * The codes 286 and 287 are needed to build a canonical tree (see _tr_init
	 * below).
	 */

	var static_dtree  = new Array(D_CODES * 2);
	zero(static_dtree);
	/* The static distance tree. (Actually a trivial tree since all codes use
	 * 5 bits.)
	 */

	var _dist_code    = new Array(DIST_CODE_LEN);
	zero(_dist_code);
	/* Distance codes. The first 256 values correspond to the distances
	 * 3 .. 258, the last 256 values correspond to the top 8 bits of
	 * the 15 bit distances.
	 */

	var _length_code  = new Array(MAX_MATCH - MIN_MATCH + 1);
	zero(_length_code);
	/* length code for each normalized match length (0 == MIN_MATCH) */

	var base_length   = new Array(LENGTH_CODES);
	zero(base_length);
	/* First normalized length for each code (0 = MIN_MATCH) */

	var base_dist     = new Array(D_CODES);
	zero(base_dist);
	/* First normalized distance for each code (0 = distance of 1) */


	function StaticTreeDesc(static_tree, extra_bits, extra_base, elems, max_length) {

	  this.static_tree  = static_tree;  /* static tree or NULL */
	  this.extra_bits   = extra_bits;   /* extra bits for each code or NULL */
	  this.extra_base   = extra_base;   /* base index for extra_bits */
	  this.elems        = elems;        /* max number of elements in the tree */
	  this.max_length   = max_length;   /* max bit length for the codes */

	  // show if `static_tree` has data or dummy - needed for monomorphic objects
	  this.has_stree    = static_tree && static_tree.length;
	}


	var static_l_desc;
	var static_d_desc;
	var static_bl_desc;


	function TreeDesc(dyn_tree, stat_desc) {
	  this.dyn_tree = dyn_tree;     /* the dynamic tree */
	  this.max_code = 0;            /* largest code with non zero frequency */
	  this.stat_desc = stat_desc;   /* the corresponding static tree */
	}



	function d_code(dist) {
	  return dist < 256 ? _dist_code[dist] : _dist_code[256 + (dist >>> 7)];
	}


	/* ===========================================================================
	 * Output a short LSB first on the stream.
	 * IN assertion: there is enough room in pendingBuf.
	 */
	function put_short(s, w) {
	//    put_byte(s, (uch)((w) & 0xff));
	//    put_byte(s, (uch)((ush)(w) >> 8));
	  s.pending_buf[s.pending++] = (w) & 0xff;
	  s.pending_buf[s.pending++] = (w >>> 8) & 0xff;
	}


	/* ===========================================================================
	 * Send a value on a given number of bits.
	 * IN assertion: length <= 16 and value fits in length bits.
	 */
	function send_bits(s, value, length) {
	  if (s.bi_valid > (Buf_size - length)) {
	    s.bi_buf |= (value << s.bi_valid) & 0xffff;
	    put_short(s, s.bi_buf);
	    s.bi_buf = value >> (Buf_size - s.bi_valid);
	    s.bi_valid += length - Buf_size;
	  } else {
	    s.bi_buf |= (value << s.bi_valid) & 0xffff;
	    s.bi_valid += length;
	  }
	}


	function send_code(s, c, tree) {
	  send_bits(s, tree[c * 2]/*.Code*/, tree[c * 2 + 1]/*.Len*/);
	}


	/* ===========================================================================
	 * Reverse the first len bits of a code, using straightforward code (a faster
	 * method would use a table)
	 * IN assertion: 1 <= len <= 15
	 */
	function bi_reverse(code, len) {
	  var res = 0;
	  do {
	    res |= code & 1;
	    code >>>= 1;
	    res <<= 1;
	  } while (--len > 0);
	  return res >>> 1;
	}


	/* ===========================================================================
	 * Flush the bit buffer, keeping at most 7 bits in it.
	 */
	function bi_flush(s) {
	  if (s.bi_valid === 16) {
	    put_short(s, s.bi_buf);
	    s.bi_buf = 0;
	    s.bi_valid = 0;

	  } else if (s.bi_valid >= 8) {
	    s.pending_buf[s.pending++] = s.bi_buf & 0xff;
	    s.bi_buf >>= 8;
	    s.bi_valid -= 8;
	  }
	}


	/* ===========================================================================
	 * Compute the optimal bit lengths for a tree and update the total bit length
	 * for the current block.
	 * IN assertion: the fields freq and dad are set, heap[heap_max] and
	 *    above are the tree nodes sorted by increasing frequency.
	 * OUT assertions: the field len is set to the optimal bit length, the
	 *     array bl_count contains the frequencies for each bit length.
	 *     The length opt_len is updated; static_len is also updated if stree is
	 *     not null.
	 */
	function gen_bitlen(s, desc)
	//    deflate_state *s;
	//    tree_desc *desc;    /* the tree descriptor */
	{
	  var tree            = desc.dyn_tree;
	  var max_code        = desc.max_code;
	  var stree           = desc.stat_desc.static_tree;
	  var has_stree       = desc.stat_desc.has_stree;
	  var extra           = desc.stat_desc.extra_bits;
	  var base            = desc.stat_desc.extra_base;
	  var max_length      = desc.stat_desc.max_length;
	  var h;              /* heap index */
	  var n, m;           /* iterate over the tree elements */
	  var bits;           /* bit length */
	  var xbits;          /* extra bits */
	  var f;              /* frequency */
	  var overflow = 0;   /* number of elements with bit length too large */

	  for (bits = 0; bits <= MAX_BITS; bits++) {
	    s.bl_count[bits] = 0;
	  }

	  /* In a first pass, compute the optimal bit lengths (which may
	   * overflow in the case of the bit length tree).
	   */
	  tree[s.heap[s.heap_max] * 2 + 1]/*.Len*/ = 0; /* root of the heap */

	  for (h = s.heap_max + 1; h < HEAP_SIZE; h++) {
	    n = s.heap[h];
	    bits = tree[tree[n * 2 + 1]/*.Dad*/ * 2 + 1]/*.Len*/ + 1;
	    if (bits > max_length) {
	      bits = max_length;
	      overflow++;
	    }
	    tree[n * 2 + 1]/*.Len*/ = bits;
	    /* We overwrite tree[n].Dad which is no longer needed */

	    if (n > max_code) { continue; } /* not a leaf node */

	    s.bl_count[bits]++;
	    xbits = 0;
	    if (n >= base) {
	      xbits = extra[n - base];
	    }
	    f = tree[n * 2]/*.Freq*/;
	    s.opt_len += f * (bits + xbits);
	    if (has_stree) {
	      s.static_len += f * (stree[n * 2 + 1]/*.Len*/ + xbits);
	    }
	  }
	  if (overflow === 0) { return; }

	  // Trace((stderr,"\nbit length overflow\n"));
	  /* This happens for example on obj2 and pic of the Calgary corpus */

	  /* Find the first bit length which could increase: */
	  do {
	    bits = max_length - 1;
	    while (s.bl_count[bits] === 0) { bits--; }
	    s.bl_count[bits]--;      /* move one leaf down the tree */
	    s.bl_count[bits + 1] += 2; /* move one overflow item as its brother */
	    s.bl_count[max_length]--;
	    /* The brother of the overflow item also moves one step up,
	     * but this does not affect bl_count[max_length]
	     */
	    overflow -= 2;
	  } while (overflow > 0);

	  /* Now recompute all bit lengths, scanning in increasing frequency.
	   * h is still equal to HEAP_SIZE. (It is simpler to reconstruct all
	   * lengths instead of fixing only the wrong ones. This idea is taken
	   * from 'ar' written by Haruhiko Okumura.)
	   */
	  for (bits = max_length; bits !== 0; bits--) {
	    n = s.bl_count[bits];
	    while (n !== 0) {
	      m = s.heap[--h];
	      if (m > max_code) { continue; }
	      if (tree[m * 2 + 1]/*.Len*/ !== bits) {
	        // Trace((stderr,"code %d bits %d->%d\n", m, tree[m].Len, bits));
	        s.opt_len += (bits - tree[m * 2 + 1]/*.Len*/) * tree[m * 2]/*.Freq*/;
	        tree[m * 2 + 1]/*.Len*/ = bits;
	      }
	      n--;
	    }
	  }
	}


	/* ===========================================================================
	 * Generate the codes for a given tree and bit counts (which need not be
	 * optimal).
	 * IN assertion: the array bl_count contains the bit length statistics for
	 * the given tree and the field len is set for all tree elements.
	 * OUT assertion: the field code is set for all tree elements of non
	 *     zero code length.
	 */
	function gen_codes(tree, max_code, bl_count)
	//    ct_data *tree;             /* the tree to decorate */
	//    int max_code;              /* largest code with non zero frequency */
	//    ushf *bl_count;            /* number of codes at each bit length */
	{
	  var next_code = new Array(MAX_BITS + 1); /* next code value for each bit length */
	  var code = 0;              /* running code value */
	  var bits;                  /* bit index */
	  var n;                     /* code index */

	  /* The distribution counts are first used to generate the code values
	   * without bit reversal.
	   */
	  for (bits = 1; bits <= MAX_BITS; bits++) {
	    next_code[bits] = code = (code + bl_count[bits - 1]) << 1;
	  }
	  /* Check that the bit counts in bl_count are consistent. The last code
	   * must be all ones.
	   */
	  //Assert (code + bl_count[MAX_BITS]-1 == (1<<MAX_BITS)-1,
	  //        "inconsistent bit counts");
	  //Tracev((stderr,"\ngen_codes: max_code %d ", max_code));

	  for (n = 0;  n <= max_code; n++) {
	    var len = tree[n * 2 + 1]/*.Len*/;
	    if (len === 0) { continue; }
	    /* Now reverse the bits */
	    tree[n * 2]/*.Code*/ = bi_reverse(next_code[len]++, len);

	    //Tracecv(tree != static_ltree, (stderr,"\nn %3d %c l %2d c %4x (%x) ",
	    //     n, (isgraph(n) ? n : ' '), len, tree[n].Code, next_code[len]-1));
	  }
	}


	/* ===========================================================================
	 * Initialize the various 'constant' tables.
	 */
	function tr_static_init() {
	  var n;        /* iterates over tree elements */
	  var bits;     /* bit counter */
	  var length;   /* length value */
	  var code;     /* code value */
	  var dist;     /* distance index */
	  var bl_count = new Array(MAX_BITS + 1);
	  /* number of codes at each bit length for an optimal tree */

	  // do check in _tr_init()
	  //if (static_init_done) return;

	  /* For some embedded targets, global variables are not initialized: */
	/*#ifdef NO_INIT_GLOBAL_POINTERS
	  static_l_desc.static_tree = static_ltree;
	  static_l_desc.extra_bits = extra_lbits;
	  static_d_desc.static_tree = static_dtree;
	  static_d_desc.extra_bits = extra_dbits;
	  static_bl_desc.extra_bits = extra_blbits;
	#endif*/

	  /* Initialize the mapping length (0..255) -> length code (0..28) */
	  length = 0;
	  for (code = 0; code < LENGTH_CODES - 1; code++) {
	    base_length[code] = length;
	    for (n = 0; n < (1 << extra_lbits[code]); n++) {
	      _length_code[length++] = code;
	    }
	  }
	  //Assert (length == 256, "tr_static_init: length != 256");
	  /* Note that the length 255 (match length 258) can be represented
	   * in two different ways: code 284 + 5 bits or code 285, so we
	   * overwrite length_code[255] to use the best encoding:
	   */
	  _length_code[length - 1] = code;

	  /* Initialize the mapping dist (0..32K) -> dist code (0..29) */
	  dist = 0;
	  for (code = 0; code < 16; code++) {
	    base_dist[code] = dist;
	    for (n = 0; n < (1 << extra_dbits[code]); n++) {
	      _dist_code[dist++] = code;
	    }
	  }
	  //Assert (dist == 256, "tr_static_init: dist != 256");
	  dist >>= 7; /* from now on, all distances are divided by 128 */
	  for (; code < D_CODES; code++) {
	    base_dist[code] = dist << 7;
	    for (n = 0; n < (1 << (extra_dbits[code] - 7)); n++) {
	      _dist_code[256 + dist++] = code;
	    }
	  }
	  //Assert (dist == 256, "tr_static_init: 256+dist != 512");

	  /* Construct the codes of the static literal tree */
	  for (bits = 0; bits <= MAX_BITS; bits++) {
	    bl_count[bits] = 0;
	  }

	  n = 0;
	  while (n <= 143) {
	    static_ltree[n * 2 + 1]/*.Len*/ = 8;
	    n++;
	    bl_count[8]++;
	  }
	  while (n <= 255) {
	    static_ltree[n * 2 + 1]/*.Len*/ = 9;
	    n++;
	    bl_count[9]++;
	  }
	  while (n <= 279) {
	    static_ltree[n * 2 + 1]/*.Len*/ = 7;
	    n++;
	    bl_count[7]++;
	  }
	  while (n <= 287) {
	    static_ltree[n * 2 + 1]/*.Len*/ = 8;
	    n++;
	    bl_count[8]++;
	  }
	  /* Codes 286 and 287 do not exist, but we must include them in the
	   * tree construction to get a canonical Huffman tree (longest code
	   * all ones)
	   */
	  gen_codes(static_ltree, L_CODES + 1, bl_count);

	  /* The static distance tree is trivial: */
	  for (n = 0; n < D_CODES; n++) {
	    static_dtree[n * 2 + 1]/*.Len*/ = 5;
	    static_dtree[n * 2]/*.Code*/ = bi_reverse(n, 5);
	  }

	  // Now data ready and we can init static trees
	  static_l_desc = new StaticTreeDesc(static_ltree, extra_lbits, LITERALS + 1, L_CODES, MAX_BITS);
	  static_d_desc = new StaticTreeDesc(static_dtree, extra_dbits, 0,          D_CODES, MAX_BITS);
	  static_bl_desc = new StaticTreeDesc(new Array(0), extra_blbits, 0,         BL_CODES, MAX_BL_BITS);

	  //static_init_done = true;
	}


	/* ===========================================================================
	 * Initialize a new block.
	 */
	function init_block(s) {
	  var n; /* iterates over tree elements */

	  /* Initialize the trees. */
	  for (n = 0; n < L_CODES;  n++) { s.dyn_ltree[n * 2]/*.Freq*/ = 0; }
	  for (n = 0; n < D_CODES;  n++) { s.dyn_dtree[n * 2]/*.Freq*/ = 0; }
	  for (n = 0; n < BL_CODES; n++) { s.bl_tree[n * 2]/*.Freq*/ = 0; }

	  s.dyn_ltree[END_BLOCK * 2]/*.Freq*/ = 1;
	  s.opt_len = s.static_len = 0;
	  s.last_lit = s.matches = 0;
	}


	/* ===========================================================================
	 * Flush the bit buffer and align the output on a byte boundary
	 */
	function bi_windup(s)
	{
	  if (s.bi_valid > 8) {
	    put_short(s, s.bi_buf);
	  } else if (s.bi_valid > 0) {
	    //put_byte(s, (Byte)s->bi_buf);
	    s.pending_buf[s.pending++] = s.bi_buf;
	  }
	  s.bi_buf = 0;
	  s.bi_valid = 0;
	}

	/* ===========================================================================
	 * Copy a stored block, storing first the length and its
	 * one's complement if requested.
	 */
	function copy_block(s, buf, len, header)
	//DeflateState *s;
	//charf    *buf;    /* the input data */
	//unsigned len;     /* its length */
	//int      header;  /* true if block header must be written */
	{
	  bi_windup(s);        /* align on byte boundary */

	  if (header) {
	    put_short(s, len);
	    put_short(s, ~len);
	  }
	//  while (len--) {
	//    put_byte(s, *buf++);
	//  }
	  common.arraySet(s.pending_buf, s.window, buf, len, s.pending);
	  s.pending += len;
	}

	/* ===========================================================================
	 * Compares to subtrees, using the tree depth as tie breaker when
	 * the subtrees have equal frequency. This minimizes the worst case length.
	 */
	function smaller(tree, n, m, depth) {
	  var _n2 = n * 2;
	  var _m2 = m * 2;
	  return (tree[_n2]/*.Freq*/ < tree[_m2]/*.Freq*/ ||
	         (tree[_n2]/*.Freq*/ === tree[_m2]/*.Freq*/ && depth[n] <= depth[m]));
	}

	/* ===========================================================================
	 * Restore the heap property by moving down the tree starting at node k,
	 * exchanging a node with the smallest of its two sons if necessary, stopping
	 * when the heap property is re-established (each father smaller than its
	 * two sons).
	 */
	function pqdownheap(s, tree, k)
	//    deflate_state *s;
	//    ct_data *tree;  /* the tree to restore */
	//    int k;               /* node to move down */
	{
	  var v = s.heap[k];
	  var j = k << 1;  /* left son of k */
	  while (j <= s.heap_len) {
	    /* Set j to the smallest of the two sons: */
	    if (j < s.heap_len &&
	      smaller(tree, s.heap[j + 1], s.heap[j], s.depth)) {
	      j++;
	    }
	    /* Exit if v is smaller than both sons */
	    if (smaller(tree, v, s.heap[j], s.depth)) { break; }

	    /* Exchange v with the smallest son */
	    s.heap[k] = s.heap[j];
	    k = j;

	    /* And continue down the tree, setting j to the left son of k */
	    j <<= 1;
	  }
	  s.heap[k] = v;
	}


	// inlined manually
	// var SMALLEST = 1;

	/* ===========================================================================
	 * Send the block data compressed using the given Huffman trees
	 */
	function compress_block(s, ltree, dtree)
	//    deflate_state *s;
	//    const ct_data *ltree; /* literal tree */
	//    const ct_data *dtree; /* distance tree */
	{
	  var dist;           /* distance of matched string */
	  var lc;             /* match length or unmatched char (if dist == 0) */
	  var lx = 0;         /* running index in l_buf */
	  var code;           /* the code to send */
	  var extra;          /* number of extra bits to send */

	  if (s.last_lit !== 0) {
	    do {
	      dist = (s.pending_buf[s.d_buf + lx * 2] << 8) | (s.pending_buf[s.d_buf + lx * 2 + 1]);
	      lc = s.pending_buf[s.l_buf + lx];
	      lx++;

	      if (dist === 0) {
	        send_code(s, lc, ltree); /* send a literal byte */
	        //Tracecv(isgraph(lc), (stderr," '%c' ", lc));
	      } else {
	        /* Here, lc is the match length - MIN_MATCH */
	        code = _length_code[lc];
	        send_code(s, code + LITERALS + 1, ltree); /* send the length code */
	        extra = extra_lbits[code];
	        if (extra !== 0) {
	          lc -= base_length[code];
	          send_bits(s, lc, extra);       /* send the extra length bits */
	        }
	        dist--; /* dist is now the match distance - 1 */
	        code = d_code(dist);
	        //Assert (code < D_CODES, "bad d_code");

	        send_code(s, code, dtree);       /* send the distance code */
	        extra = extra_dbits[code];
	        if (extra !== 0) {
	          dist -= base_dist[code];
	          send_bits(s, dist, extra);   /* send the extra distance bits */
	        }
	      } /* literal or match pair ? */

	      /* Check that the overlay between pending_buf and d_buf+l_buf is ok: */
	      //Assert((uInt)(s->pending) < s->lit_bufsize + 2*lx,
	      //       "pendingBuf overflow");

	    } while (lx < s.last_lit);
	  }

	  send_code(s, END_BLOCK, ltree);
	}


	/* ===========================================================================
	 * Construct one Huffman tree and assigns the code bit strings and lengths.
	 * Update the total bit length for the current block.
	 * IN assertion: the field freq is set for all tree elements.
	 * OUT assertions: the fields len and code are set to the optimal bit length