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strict';\n\n(function () {\n  function toArray(arr) {\n    return Array.prototype.slice.call(arr);\n  }\n\n  function promisifyRequest(request) {\n    return new Promise(function (resolve, reject) {\n      request.onsuccess = function () {\n        resolve(request.result);\n      };\n\n      request.onerror = function () {\n        reject(request.error);\n      };\n    });\n  }\n\n  function promisifyRequestCall(obj, method, args) {\n    var request;\n    var p = new Promise(function (resolve, reject) {\n      request = obj[method].apply(obj, args);\n      promisifyRequest(request).then(resolve, reject);\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 get() {\n          return this[targetProp][prop];\n        },\n        set: function set(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\n      ProxyClass.prototype[prop] = function () {\n        return promisifyRequestCall(this[targetProp], prop, arguments);\n      };\n    });\n  }\n\n  function proxyMethods(ProxyClass, targetProp, Constructor, properties) {\n    properties.forEach(function (prop) {\n      if (!(prop in Constructor.prototype)) return;\n\n      ProxyClass.prototype[prop] = function () {\n        return this[targetProp][prop].apply(this[targetProp], arguments);\n      };\n    });\n  }\n\n  function proxyCursorRequestMethods(ProxyClass, targetProp, Constructor, properties) {\n    properties.forEach(function (prop) {\n      if (!(prop in Constructor.prototype)) return;\n\n      ProxyClass.prototype[prop] = function () {\n        return promisifyCursorRequestCall(this[targetProp], prop, arguments);\n      };\n    });\n  }\n\n  function Index(index) {\n    this._index = index;\n  }\n\n  proxyProperties(Index, '_index', ['name', 'keyPath', 'multiEntry', 'unique']);\n  proxyRequestMethods(Index, '_index', IDBIndex, ['get', 'getKey', 'getAll', 'getAllKeys', 'count']);\n  proxyCursorRequestMethods(Index, '_index', IDBIndex, ['openCursor', 'openKeyCursor']);\n\n  function Cursor(cursor, request) {\n    this._cursor = cursor;\n    this._request = request;\n  }\n\n  proxyProperties(Cursor, '_cursor', ['direction', 'key', 'primaryKey', 'value']);\n  proxyRequestMethods(Cursor, '_cursor', IDBCursor, ['update', 'delete']); // proxy 'next' methods\n\n  ['advance', 'continue', 'continuePrimaryKey'].forEach(function (methodName) {\n    if (!(methodName in IDBCursor.prototype)) return;\n\n    Cursor.prototype[methodName] = function () {\n      var cursor = this;\n      var args = arguments;\n      return Promise.resolve().then(function () {\n        cursor._cursor[methodName].apply(cursor._cursor, args);\n\n        return promisifyRequest(cursor._request).then(function (value) {\n          if (!value) return;\n          return new Cursor(value, cursor._request);\n        });\n      });\n    };\n  });\n\n  function ObjectStore(store) {\n    this._store = 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', ['name', 'keyPath', 'indexNames', 'autoIncrement']);\n  proxyRequestMethods(ObjectStore, '_store', IDBObjectStore, ['put', 'add', 'delete', 'clear', 'get', 'getAll', 'getKey', 'getAllKeys', 'count']);\n  proxyCursorRequestMethods(ObjectStore, '_store', IDBObjectStore, ['openCursor', 'openKeyCursor']);\n  proxyMethods(ObjectStore, '_store', IDBObjectStore, ['deleteIndex']);\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\n      idbTransaction.onerror = function () {\n        reject(idbTransaction.error);\n      };\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', ['objectStoreNames', 'mode']);\n  proxyMethods(Transaction, '_tx', IDBTransaction, ['abort']);\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', ['name', 'version', 'objectStoreNames']);\n  proxyMethods(UpgradeDB, '_db', IDBDatabase, ['deleteObjectStore', 'close']);\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', ['name', 'version', 'objectStoreNames']);\n  proxyMethods(DB, '_db', IDBDatabase, ['close']); // Add cursor iterators\n  // TODO: remove this once browsers do the right thing with promises\n\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\n        request.onsuccess = function () {\n          callback(request.result);\n        };\n      };\n    });\n  }); // polyfill getAll\n\n  [Index, ObjectStore].forEach(function (Constructor) {\n    if (Constructor.prototype.getAll) return;\n\n    Constructor.prototype.getAll = function (query, count) {\n      var instance = this;\n      var items = [];\n      return new Promise(function (resolve) {\n        instance.iterateCursor(query, function (cursor) {\n          if (!cursor) {\n            resolve(items);\n            return;\n          }\n\n          items.push(cursor.value);\n\n          if (count !== undefined && items.length == count) {\n            resolve(items);\n            return;\n          }\n\n          cursor.continue();\n        });\n      });\n    };\n  });\n  var exp = {\n    open: function open(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    delete: function _delete(name) {\n      return promisifyRequestCall(indexedDB, 'deleteDatabase', [name]);\n    }\n  };\n\n  if (typeof module !== 'undefined') {\n    module.exports = exp;\n    module.exports.default = module.exports;\n  } else {\n    self.idb = exp;\n  }\n})();"],"sourceRoot":""}