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BSD-3-Clause License. Feross Aboukhadijeh <https://feross.org/opensource> */\nexports.read = function (buffer, offset, isLE, mLen, nBytes) {\n  var e, m\n  var eLen = (nBytes * 8) - mLen - 1\n  var eMax = (1 << eLen) - 1\n  var eBias = eMax >> 1\n  var nBits = -7\n  var i = isLE ? (nBytes - 1) : 0\n  var d = isLE ? -1 : 1\n  var s = buffer[offset + i]\n\n  i += d\n\n  e = s & ((1 << (-nBits)) - 1)\n  s >>= (-nBits)\n  nBits += eLen\n  for (; nBits > 0; e = (e * 256) + buffer[offset + i], i += d, nBits -= 8) {}\n\n  m = e & ((1 << (-nBits)) - 1)\n  e >>= (-nBits)\n  nBits += mLen\n  for (; nBits > 0; m = (m * 256) + buffer[offset + i], i += d, nBits -= 8) {}\n\n  if (e === 0) {\n    e = 1 - eBias\n  } else if (e === eMax) {\n    return m ? 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});\n\n    p.request = request;\n    return p;\n  }\n\n  function promisifyCursorRequestCall(obj, method, args) {\n    var p = promisifyRequestCall(obj, method, args);\n    return p.then(function(value) {\n      if (!value) return;\n      return new Cursor(value, p.request);\n    });\n  }\n\n  function proxyProperties(ProxyClass, targetProp, properties) {\n    properties.forEach(function(prop) {\n      Object.defineProperty(ProxyClass.prototype, prop, {\n        get: function() {\n          return this[targetProp][prop];\n        },\n        set: function(val) {\n          this[targetProp][prop] = val;\n        }\n      });\n    });\n  }\n\n  function proxyRequestMethods(ProxyClass, targetProp, Constructor, properties) {\n    properties.forEach(function(prop) {\n      if (!(prop in Constructor.prototype)) return;\n      ProxyClass.prototype[prop] = function() {\n        return promisifyRequestCall(this[targetProp], prop, arguments);\n      };\n    });\n  }\n\n  function 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store;\n  }\n\n  ObjectStore.prototype.createIndex = function() {\n    return new Index(this._store.createIndex.apply(this._store, arguments));\n  };\n\n  ObjectStore.prototype.index = function() {\n    return new Index(this._store.index.apply(this._store, arguments));\n  };\n\n  proxyProperties(ObjectStore, '_store', [\n    'name',\n    'keyPath',\n    'indexNames',\n    'autoIncrement'\n  ]);\n\n  proxyRequestMethods(ObjectStore, '_store', IDBObjectStore, [\n    'put',\n    'add',\n    'delete',\n    'clear',\n    'get',\n    'getAll',\n    'getKey',\n    'getAllKeys',\n    'count'\n  ]);\n\n  proxyCursorRequestMethods(ObjectStore, '_store', IDBObjectStore, [\n    'openCursor',\n    'openKeyCursor'\n  ]);\n\n  proxyMethods(ObjectStore, '_store', IDBObjectStore, [\n    'deleteIndex'\n  ]);\n\n  function Transaction(idbTransaction) {\n    this._tx = idbTransaction;\n    this.complete = new Promise(function(resolve, reject) {\n      idbTransaction.oncomplete = function() {\n        resolve();\n      };\n      idbTransaction.onerror = function() {\n        reject(idbTransaction.error);\n      };\n      idbTransaction.onabort = function() {\n        reject(idbTransaction.error);\n      };\n    });\n  }\n\n  Transaction.prototype.objectStore = function() {\n    return new ObjectStore(this._tx.objectStore.apply(this._tx, arguments));\n  };\n\n  proxyProperties(Transaction, '_tx', [\n    'objectStoreNames',\n    'mode'\n  ]);\n\n  proxyMethods(Transaction, '_tx', IDBTransaction, [\n    'abort'\n  ]);\n\n  function UpgradeDB(db, oldVersion, transaction) {\n    this._db = db;\n    this.oldVersion = oldVersion;\n    this.transaction = new Transaction(transaction);\n  }\n\n  UpgradeDB.prototype.createObjectStore = function() {\n    return new ObjectStore(this._db.createObjectStore.apply(this._db, arguments));\n  };\n\n  proxyProperties(UpgradeDB, '_db', [\n    'name',\n    'version',\n    'objectStoreNames'\n  ]);\n\n  proxyMethods(UpgradeDB, '_db', IDBDatabase, [\n    'deleteObjectStore',\n    'close'\n  ]);\n\n  function DB(db) {\n    this._db = db;\n  }\n\n  DB.prototype.transaction = function() {\n    return new Transaction(this._db.transaction.apply(this._db, arguments));\n  };\n\n  proxyProperties(DB, '_db', [\n    'name',\n    'version',\n    'objectStoreNames'\n  ]);\n\n  proxyMethods(DB, '_db', IDBDatabase, [\n    'close'\n  ]);\n\n  // Add cursor iterators\n  // TODO: remove this once browsers do the right thing with promises\n  ['openCursor', 'openKeyCursor'].forEach(function(funcName) {\n    [ObjectStore, Index].forEach(function(Constructor) {\n      // Don't create iterateKeyCursor if openKeyCursor doesn't exist.\n      if (!(funcName in Constructor.prototype)) return;\n\n      Constructor.prototype[funcName.replace('open', 'iterate')] = function() {\n        var args = toArray(arguments);\n        var callback = args[args.length - 1];\n        var nativeObject = this._store || this._index;\n        var request = nativeObject[funcName].apply(nativeObject, args.slice(0, -1));\n        request.onsuccess = function() {\n          callback(request.result);\n        };\n      };\n    });\n  });\n\n  // polyfill getAll\n  [Index, ObjectStore].forEach(function(Constructor) {\n    if (Constructor.prototype.getAll) return;\n    Constructor.prototype.getAll = function(query, count) {\n      var instance = this;\n      var items = [];\n\n      return new Promise(function(resolve) {\n        instance.iterateCursor(query, function(cursor) {\n          if (!cursor) {\n            resolve(items);\n            return;\n          }\n          items.push(cursor.value);\n\n          if (count !== undefined && items.length == count) {\n            resolve(items);\n            return;\n          }\n          cursor.continue();\n        });\n      });\n    };\n  });\n\n  function openDb(name, version, upgradeCallback) {\n    var p = promisifyRequestCall(indexedDB, 'open', [name, version]);\n    var request = p.request;\n\n    if (request) {\n      request.onupgradeneeded = function(event) {\n        if (upgradeCallback) {\n          upgradeCallback(new UpgradeDB(request.result, event.oldVersion, request.transaction));\n        }\n      };\n    }\n\n    return p.then(function(db) {\n      return new DB(db);\n    });\n  }\n\n  function deleteDb(name) {\n    return promisifyRequestCall(indexedDB, 'deleteDatabase', [name]);\n  }\n\n  exports.openDb = openDb;\n  exports.deleteDb = deleteDb;\n\n  Object.defineProperty(exports, '__esModule', { value: true });\n\n}));\n","var toString = {}.toString;\n\nmodule.exports = Array.isArray || function (arr) {\n  return toString.call(arr) == '[object Array]';\n};\n"],"sourceRoot":""}