localforage - npm Package Compare versions

Comparing version 1.5.7 to 1.6.0

bower.json

@@ -28,3 +28,3 @@ {
   },
-  "version": "1.5.7"
+  "version": "1.6.0"
 }

CHANGELOG.md

@@ -6,2 +6,23 @@ # About this CHANGELOG
 
+### [1.6](https://github.com/mozilla/localForage/releases/tag/1.6.0)
+
+* Add `dropInstance()` method to localforage.
+* Improve IDB driver reliability when a connection gets closed.
+
+### [1.5.7]
+
+* Fix IE8 localStorage support detection.
+
+### [1.5.6]
+
+* Upgrade lie to 3.1.1 to work with yarn.
+
+### [1.5.5]
+
+* Roll back dropInstance breaking change.
+
+### [1.5.4]
+
+* Set `null` as `undefined` (for Edge).
+
 ### [1.5.3]
@@ -8,0 +29,0 @@

component.json

 {
   "name": "localforage",
-  "version": "1.5.7",
+  "version": "1.6.0",
   "dependencies": {
@@ -5,0 +5,0 @@ "then/promise": "5.0.0"

dist/localforage.min.js

 /*!
     localForage -- Offline Storage, Improved
-    Version 1.5.7
+    Version 1.6.0
     https://localforage.github.io/localForage
     (c) 2013-2017 Mozilla, Apache License 2.0
 */
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dist/localforage.nopromises.min.js

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-    Version 1.5.7
+    Version 1.6.0
     https://localforage.github.io/localForage
     (c) 2013-2017 Mozilla, Apache License 2.0
 */
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docs/api.md

@@ -443,3 +443,3 @@ # localForage
 
-Returns the name of the driver being used, or `null` if none can be used.
+Returns the name of the driver being used, `null` during the asynchronous driver initialization process (see <a href="#driver-api-ready"><code>ready</code></a> for more details), or `null` if the asynchronous driver initialization process failed to find a usable driver.
 
@@ -500,1 +500,26 @@ <aside class="notice">
 Creates a new instance of localForage and returns it. Each object contains its own database and doesn't affect other instances of localForage.
+
+## dropInstance
+
+```js
+localforage.dropInstance().then(function() {
+  console.log('Dropped the store of the current instance').
+});
+
+localforage.dropInstance({
+  name: "otherName",
+  storeName: "otherStore"
+}).then(function() {
+  console.log('Dropped otherStore').
+});
+
+localforage.dropInstance({
+  name: "otherName"
+}).then(function() {
+  console.log('Dropped otherName database').
+});
+```
+
+When invoked with no arguments, it drops the "store" of the current instance.
+When invoked with an object specifying both `name` and `storeName` properties, it drops the specified "store".
+When invoked with an object specifying only a `name` property, it drops the specified "database" (and all its stores).

Gruntfile.js

@@ -147,2 +147,3 @@ var path = require('path');
                         'http://localhost:9999/test/test.min.html',
+                        'http://localhost:9999/test/test.polyfill.html',
                         'http://localhost:9999/test/test.callwhenready.html',
@@ -149,0 +150,0 @@ 'http://localhost:9999/test/test.customdriver.html',

package.json

@@ -12,3 +12,3 @@ {
   ],
-  "version": "1.5.7",
+  "version": "1.6.0",
   "homepage": "https://github.com/localForage/localForage",
@@ -21,2 +21,4 @@ "repository": {
     "build": "node -e \"require('grunt').cli()\" null build",
+    "precommit": "lint-staged",
+    "prettify": "prettier --write \"src/**/*.js\" \"test/**/*.js\"",
     "publish-docs": "node -e \"require('grunt').cli()\" null copy build-rules-html publish-rules",
@@ -38,2 +40,3 @@ "serve": "node -e \"require('grunt').cli()\" null serve",
     "cors": "^2.3.1",
+    "eslint-config-prettier": "^2.9.0",
     "grunt": "^0.4.2",
@@ -54,5 +57,8 @@ "grunt-babel": "^6.0.0",
     "grunt-webpack": "^1.0.11",
+    "husky": "^0.14.3",
+    "lint-staged": "^5.0.0",
     "load-grunt-tasks": "^0.4.0",
     "mocha": "^3.4.2",
     "phantomjs": "^2.1.7",
+    "prettier": "^1.9.2",
     "rollupify": "^0.1.0",
@@ -59,0 +65,0 @@ "script-loader": "^0.6.1",

README.md

@@ -5,3 +5,4 @@ # localForage
 [![Dependency Status](https://img.shields.io/david/localForage/localForage.svg)](https://david-dm.org/localForage/localForage)
-[![npm](https://img.shields.io/npm/dm/localforage.svg?maxAge=2592000)]()
+[![npm](https://img.shields.io/npm/dm/localforage.svg?maxAge=2592000)](https://npmcharts.com/compare/localforage?minimal=true)
+[![jsDelivr Hits](https://data.jsdelivr.com/v1/package/npm/localforage/badge?style=rounded)](https://www.jsdelivr.com/package/npm/localforage)
 
@@ -205,2 +206,3 @@ localForage is a fast and simple storage library for JavaScript. localForage
 * [AngularJS](https://github.com/ocombe/angular-localForage)
+* [Angular 4+](https://www.npmjs.com/package/ngforage)
 * [Backbone](https://github.com/localForage/localForage-backbone)
@@ -207,0 +209,0 @@ * [Ember](https://github.com/genkgo/ember-localforage-adapter)

src/drivers/indexeddb.js

@@ -8,2 +8,3 @@ import isIndexedDBValid from '../utils/isIndexedDBValid';
 import normalizeKey from '../utils/normalizeKey';
+import getCallback from '../utils/getCallback';
 
@@ -13,10 +14,10 @@ // Some code originally from async_storage.js in
 
-var DETECT_BLOB_SUPPORT_STORE = 'local-forage-detect-blob-support';
-var supportsBlobs;
-var dbContexts;
-var toString = Object.prototype.toString;
+const DETECT_BLOB_SUPPORT_STORE = 'local-forage-detect-blob-support';
+let supportsBlobs;
+const dbContexts = {};
+const toString = Object.prototype.toString;
 
 // Transaction Modes
-var READ_ONLY = 'readonly';
-var READ_WRITE = 'readwrite';
+const READ_ONLY = 'readonly';
+const READ_WRITE = 'readwrite';
 
@@ -72,4 +73,7 @@ // Transform a binary string to an array buffer, because otherwise
             // https://msdn.microsoft.com/en-us/library/hh869301%28v=vs.85%29.aspx
-            resolve(matchedEdge || !matchedChrome ||
-              parseInt(matchedChrome[1], 10) >= 43);
+            resolve(
+                matchedEdge ||
+                    !matchedChrome ||
+                    parseInt(matchedChrome[1], 10) >= 43
+            );
         };
@@ -97,4 +101,5 @@ }).catch(function() {
 
-    deferredOperation.promise = new Promise(function(resolve) {
+    deferredOperation.promise = new Promise(function(resolve, reject) {
         deferredOperation.resolve = resolve;
+        deferredOperation.reject = reject;
     });
@@ -125,2 +130,3 @@
         deferredOperation.resolve();
+        return deferredOperation.promise;
     }
@@ -139,2 +145,3 @@ }
         deferredOperation.reject(err);
+        return deferredOperation.promise;
     }
@@ -145,2 +152,3 @@ }
     return new Promise(function(resolve, reject) {
+        dbContexts[dbInfo.name] = dbContexts[dbInfo.name] || createDbContext();
 
@@ -175,6 +183,14 @@ if (dbInfo.db) {
                     if (ex.name === 'ConstraintError') {
-                        console.warn('The database "' + dbInfo.name + '"' +
-                            ' has been upgraded from version ' + e.oldVersion +
-                            ' to version ' + e.newVersion +
-                            ', but the storage "' + dbInfo.storeName + '" already exists.');
+                        console.warn(
+                            'The database "' +
+                                dbInfo.name +
+                                '"' +
+                                ' has been upgraded from version ' +
+                                e.oldVersion +
+                                ' to version ' +
+                                e.newVersion +
+                                ', but the storage "' +
+                                dbInfo.storeName +
+                                '" already exists.'
+                        );
                     } else {
@@ -220,5 +236,12 @@ throw ex;
         if (dbInfo.version !== defaultVersion) {
-            console.warn('The database "' + dbInfo.name + '"' +
-                ' can\'t be downgraded from version ' + dbInfo.db.version +
-                ' to version ' + dbInfo.version + '.');
+            console.warn(
+                'The database "' +
+                    dbInfo.name +
+                    '"' +
+                    " can't be downgraded from version " +
+                    dbInfo.db.version +
+                    ' to version ' +
+                    dbInfo.version +
+                    '.'
+            );
         }
@@ -266,3 +289,3 @@ // Align the versions to prevent errors.
     var arrayBuff = _binStringToArrayBuffer(atob(encodedBlob.data));
-    return createBlob([arrayBuff], {type: encodedBlob.type});
+    return createBlob([arrayBuff], { type: encodedBlob.type });
 }
@@ -304,22 +327,40 @@
     for (var i = 0; i < forages.length; i++) {
-        if (forages[i]._dbInfo.db) {
-            forages[i]._dbInfo.db.close();
-            forages[i]._dbInfo.db = null;
+        const forage = forages[i];
+        if (forage._dbInfo.db) {
+            forage._dbInfo.db.close();
+            forage._dbInfo.db = null;
         }
     }
+    dbInfo.db = null;
 
-    return _getConnection(dbInfo, false).then(function(db) {
-        for (var j = 0; j < forages.length; j++) {
-            forages[j]._dbInfo.db = db;
-        }
-    }).catch(function(err) {
-        _rejectReadiness(dbInfo, err);
-        throw err;
-    });
+    return _getOriginalConnection(dbInfo)
+        .then(db => {
+            dbInfo.db = db;
+            if (_isUpgradeNeeded(dbInfo)) {
+                // Reopen the database for upgrading.
+                return _getUpgradedConnection(dbInfo);
+            }
+            return db;
+        })
+        .then(db => {
+            // store the latest db reference
+            // in case the db was upgraded
+            dbInfo.db = dbContext.db = db;
+            for (var i = 0; i < forages.length; i++) {
+                forages[i]._dbInfo.db = db;
+            }
+        })
+        .catch(err => {
+            _rejectReadiness(dbInfo, err);
+            throw err;
+        });
 }
 
-
 // FF doesn't like Promises (micro-tasks) and IDDB store operations,
 // so we have to do it with callbacks
-function createTransaction(dbInfo, mode, callback) {
+function createTransaction(dbInfo, mode, callback, retries) {
+    if (retries === undefined) {
+        retries = 1;
+    }
+
     try {
@@ -329,9 +370,32 @@ var tx = dbInfo.db.transaction(dbInfo.storeName, mode);
     } catch (err) {
-        if (!dbInfo.db ||
-            err.name === 'InvalidStateError') {
-            return _tryReconnect(dbInfo).then(function() {
-
-                var tx = dbInfo.db.transaction(dbInfo.storeName, mode);
-                callback(null, tx);
-            });
+        if (
+            retries > 0 &&
+            (!dbInfo.db ||
+                err.name === 'InvalidStateError' ||
+                err.name === 'NotFoundError')
+        ) {
+            return Promise.resolve()
+                .then(() => {
+                    if (
+                        !dbInfo.db ||
+                        (err.name === 'NotFoundError' &&
+                            !dbInfo.db.objectStoreNames.contains(
+                                dbInfo.storeName
+                            ) &&
+                            dbInfo.version <= dbInfo.db.version)
+                    ) {
+                        // increase the db version, to create the new ObjectStore
+                        if (dbInfo.db) {
+                            dbInfo.version = dbInfo.db.version + 1;
+                        }
+                        // Reopen the database for upgrading.
+                        return _getUpgradedConnection(dbInfo);
+                    }
+                })
+                .then(() => {
+                    return _tryReconnect(dbInfo).then(function() {
+                        createTransaction(dbInfo, mode, callback, retries - 1);
+                    });
+                })
+                .catch(callback);
         }
@@ -343,2 +407,14 @@
 
+function createDbContext() {
+    return {
+        // Running localForages sharing a database.
+        forages: [],
+        // Shared database.
+        db: null,
+        // Database readiness (promise).
+        dbReady: null,
+        // Deferred operations on the database.
+        deferredOperations: []
+    };
+}
 
@@ -359,7 +435,2 @@ // Open the IndexedDB database (automatically creates one if one didn't
 
-    // Initialize a singleton container for all running localForages.
-    if (!dbContexts) {
-        dbContexts = {};
-    }
-
     // Get the current context of the database;
@@ -370,12 +441,3 @@ var dbContext = dbContexts[dbInfo.name];
     if (!dbContext) {
-        dbContext = {
-            // Running localForages sharing a database.
-            forages: [],
-            // Shared database.
-            db: null,
-            // Database readiness (promise).
-            dbReady: null,
-            // Deferred operations on the database.
-            deferredOperations: []
-        };
+        dbContext = createDbContext();
         // Register the new context in the global container.
@@ -405,3 +467,4 @@ dbContexts[dbInfo.name] = dbContext;
         var forage = dbContext.forages[j];
-        if (forage !== self) { // Don't wait for itself...
+        if (forage !== self) {
+            // Don't wait for itself...
             initPromises.push(forage._initReady().catch(ignoreErrors));
@@ -416,28 +479,31 @@ }
     // all the related localForages aren't pending.
-    return Promise.all(initPromises).then(function() {
-        dbInfo.db = dbContext.db;
-        // Get the connection or open a new one without upgrade.
-        return _getOriginalConnection(dbInfo);
-    }).then(function(db) {
-        dbInfo.db = db;
-        if (_isUpgradeNeeded(dbInfo, self._defaultConfig.version)) {
-            // Reopen the database for upgrading.
-            return _getUpgradedConnection(dbInfo);
-        }
-        return db;
-    }).then(function(db) {
-        dbInfo.db = dbContext.db = db;
-        self._dbInfo = dbInfo;
-        // Share the final connection amongst related localForages.
-        for (var k = 0; k < forages.length; k++) {
-            var forage = forages[k];
-            if (forage !== self) { // Self is already up-to-date.
-                forage._dbInfo.db = dbInfo.db;
-                forage._dbInfo.version = dbInfo.version;
+    return Promise.all(initPromises)
+        .then(function() {
+            dbInfo.db = dbContext.db;
+            // Get the connection or open a new one without upgrade.
+            return _getOriginalConnection(dbInfo);
+        })
+        .then(function(db) {
+            dbInfo.db = db;
+            if (_isUpgradeNeeded(dbInfo, self._defaultConfig.version)) {
+                // Reopen the database for upgrading.
+                return _getUpgradedConnection(dbInfo);
             }
-        }
-    });
+            return db;
+        })
+        .then(function(db) {
+            dbInfo.db = dbContext.db = db;
+            self._dbInfo = dbInfo;
+            // Share the final connection amongst related localForages.
+            for (var k = 0; k < forages.length; k++) {
+                var forage = forages[k];
+                if (forage !== self) {
+                    // Self is already up-to-date.
+                    forage._dbInfo.db = dbInfo.db;
+                    forage._dbInfo.version = dbInfo.version;
+                }
+            }
+        });
 }
 
-
 function getItem(key, callback) {
@@ -449,31 +515,39 @@ var self = this;
     var promise = new Promise(function(resolve, reject) {
-        self.ready().then(function() {
-            createTransaction(self._dbInfo, READ_ONLY, function(err, transaction) {
-                if (err) {
-                    return reject(err);
-                }
+        self
+            .ready()
+            .then(function() {
+                createTransaction(self._dbInfo, READ_ONLY, function(
+                    err,
+                    transaction
+                ) {
+                    if (err) {
+                        return reject(err);
+                    }
 
-                try {
-                    var store = transaction.objectStore(self._dbInfo.storeName);
-                    var req = store.get(key);
+                    try {
+                        var store = transaction.objectStore(
+                            self._dbInfo.storeName
+                        );
+                        var req = store.get(key);
 
-                    req.onsuccess = function() {
-                        var value = req.result;
-                        if (value === undefined) {
-                            value = null;
-                        }
-                        if (_isEncodedBlob(value)) {
-                            value = _decodeBlob(value);
-                        }
-                        resolve(value);
-                    };
+                        req.onsuccess = function() {
+                            var value = req.result;
+                            if (value === undefined) {
+                                value = null;
+                            }
+                            if (_isEncodedBlob(value)) {
+                                value = _decodeBlob(value);
+                            }
+                            resolve(value);
+                        };
 
-                    req.onerror = function() {
-                        reject(req.error);
-                    };
-                } catch (e) {
-                    reject(e);
-                }
-            });
-        }).catch(reject);
+                        req.onerror = function() {
+                            reject(req.error);
+                        };
+                    } catch (e) {
+                        reject(e);
+                    }
+                });
+            })
+            .catch(reject);
     });
@@ -490,45 +564,56 @@
     var promise = new Promise(function(resolve, reject) {
-        self.ready().then(function() {
-            createTransaction(self._dbInfo, READ_ONLY, function(err, transaction) {
-                if (err) {
-                    return reject(err);
-                }
+        self
+            .ready()
+            .then(function() {
+                createTransaction(self._dbInfo, READ_ONLY, function(
+                    err,
+                    transaction
+                ) {
+                    if (err) {
+                        return reject(err);
+                    }
 
-                try {
-                    var store = transaction.objectStore(self._dbInfo.storeName);
-                    var req = store.openCursor();
-                    var iterationNumber = 1;
+                    try {
+                        var store = transaction.objectStore(
+                            self._dbInfo.storeName
+                        );
+                        var req = store.openCursor();
+                        var iterationNumber = 1;
 
-                    req.onsuccess = function() {
-                        var cursor = req.result;
+                        req.onsuccess = function() {
+                            var cursor = req.result;
 
-                        if (cursor) {
-                            var value = cursor.value;
-                            if (_isEncodedBlob(value)) {
-                                value = _decodeBlob(value);
-                            }
-                            var result = iterator(value, cursor.key,
-                                                  iterationNumber++);
+                            if (cursor) {
+                                var value = cursor.value;
+                                if (_isEncodedBlob(value)) {
+                                    value = _decodeBlob(value);
+                                }
+                                var result = iterator(
+                                    value,
+                                    cursor.key,
+                                    iterationNumber++
+                                );
 
-                            // when the iterator callback retuns any
-                            // (non-`undefined`) value, then we stop
-                            // the iteration immediately
-                            if (result !== void(0)) {
-                                resolve(result);
+                                // when the iterator callback retuns any
+                                // (non-`undefined`) value, then we stop
+                                // the iteration immediately
+                                if (result !== void 0) {
+                                    resolve(result);
+                                } else {
+                                    cursor.continue();
+                                }
                             } else {
-                                cursor.continue();
+                                resolve();
                             }
-                        } else {
-                            resolve();
-                        }
-                    };
+                        };
 
-                    req.onerror = function() {
-                        reject(req.error);
-                    };
-                } catch (e) {
-                    reject(e);
-                }
-            });
-        }).catch(reject);
+                        req.onerror = function() {
+                            reject(req.error);
+                        };
+                    } catch (e) {
+                        reject(e);
+                    }
+                });
+            })
+            .catch(reject);
     });
@@ -548,54 +633,67 @@
         var dbInfo;
-        self.ready().then(function() {
-            dbInfo = self._dbInfo;
-            if (toString.call(value) === '[object Blob]') {
-                return _checkBlobSupport(dbInfo.db).then(function(blobSupport) {
-                    if (blobSupport) {
-                        return value;
-                    }
-                    return _encodeBlob(value);
-                });
-            }
-            return value;
-        }).then(function(value) {
-            createTransaction(self._dbInfo, READ_WRITE, function(err, transaction) {
-                if (err) {
-                    return reject(err);
+        self
+            .ready()
+            .then(function() {
+                dbInfo = self._dbInfo;
+                if (toString.call(value) === '[object Blob]') {
+                    return _checkBlobSupport(dbInfo.db).then(function(
+                        blobSupport
+                    ) {
+                        if (blobSupport) {
+                            return value;
+                        }
+                        return _encodeBlob(value);
+                    });
                 }
-
-                try {
-                    var store = transaction.objectStore(self._dbInfo.storeName);
-
-                    // The reason we don't _save_ null is because IE 10 does
-                    // not support saving the `null` type in IndexedDB. How
-                    // ironic, given the bug below!
-                    // See: https://github.com/mozilla/localForage/issues/161
-                    if (value === null) {
-                        value = undefined;
+                return value;
+            })
+            .then(function(value) {
+                createTransaction(self._dbInfo, READ_WRITE, function(
+                    err,
+                    transaction
+                ) {
+                    if (err) {
+                        return reject(err);
                     }
 
-                    var req = store.put(value, key);
+                    try {
+                        var store = transaction.objectStore(
+                            self._dbInfo.storeName
+                        );
 
-                    transaction.oncomplete = function() {
-                        // Cast to undefined so the value passed to
-                        // callback/promise is the same as what one would get out
-                        // of `getItem()` later. This leads to some weirdness
-                        // (setItem('foo', undefined) will return `null`), but
-                        // it's not my fault localStorage is our baseline and that
-                        // it's weird.
-                        if (value === undefined) {
-                            value = null;
+                        // The reason we don't _save_ null is because IE 10 does
+                        // not support saving the `null` type in IndexedDB. How
+                        // ironic, given the bug below!
+                        // See: https://github.com/mozilla/localForage/issues/161
+                        if (value === null) {
+                            value = undefined;
                         }
 
-                        resolve(value);
-                    };
-                    transaction.onabort = transaction.onerror = function() {
-                        var err = req.error ? req.error : req.transaction.error;
-                        reject(err);
-                    };
-                } catch (e) {
-                    reject(e);
-                }
-            });
-        }).catch(reject);
+                        var req = store.put(value, key);
+
+                        transaction.oncomplete = function() {
+                            // Cast to undefined so the value passed to
+                            // callback/promise is the same as what one would get out
+                            // of `getItem()` later. This leads to some weirdness
+                            // (setItem('foo', undefined) will return `null`), but
+                            // it's not my fault localStorage is our baseline and that
+                            // it's weird.
+                            if (value === undefined) {
+                                value = null;
+                            }
+
+                            resolve(value);
+                        };
+                        transaction.onabort = transaction.onerror = function() {
+                            var err = req.error
+                                ? req.error
+                                : req.transaction.error;
+                            reject(err);
+                        };
+                    } catch (e) {
+                        reject(e);
+                    }
+                });
+            })
+            .catch(reject);
     });
@@ -613,35 +711,45 @@
     var promise = new Promise(function(resolve, reject) {
-        self.ready().then(function() {
-            createTransaction(self._dbInfo, READ_WRITE, function(err, transaction) {
-                if (err) {
-                    return reject(err);
-                }
+        self
+            .ready()
+            .then(function() {
+                createTransaction(self._dbInfo, READ_WRITE, function(
+                    err,
+                    transaction
+                ) {
+                    if (err) {
+                        return reject(err);
+                    }
 
-                try {
-                    var store = transaction.objectStore(self._dbInfo.storeName);
-                    // We use a Grunt task to make this safe for IE and some
-                    // versions of Android (including those used by Cordova).
-                    // Normally IE won't like `.delete()` and will insist on
-                    // using `['delete']()`, but we have a build step that
-                    // fixes this for us now.
-                    var req = store.delete(key);
-                    transaction.oncomplete = function() {
-                        resolve();
-                    };
+                    try {
+                        var store = transaction.objectStore(
+                            self._dbInfo.storeName
+                        );
+                        // We use a Grunt task to make this safe for IE and some
+                        // versions of Android (including those used by Cordova).
+                        // Normally IE won't like `.delete()` and will insist on
+                        // using `['delete']()`, but we have a build step that
+                        // fixes this for us now.
+                        var req = store.delete(key);
+                        transaction.oncomplete = function() {
+                            resolve();
+                        };
 
-                    transaction.onerror = function() {
-                        reject(req.error);
-                    };
+                        transaction.onerror = function() {
+                            reject(req.error);
+                        };
 
-                    // The request will be also be aborted if we've exceeded our storage
-                    // space.
-                    transaction.onabort = function() {
-                        var err = req.error ? req.error : req.transaction.error;
-                        reject(err);
-                    };
-                } catch (e) {
-                    reject(e);
-                }
-            });
-        }).catch(reject);
+                        // The request will be also be aborted if we've exceeded our storage
+                        // space.
+                        transaction.onabort = function() {
+                            var err = req.error
+                                ? req.error
+                                : req.transaction.error;
+                            reject(err);
+                        };
+                    } catch (e) {
+                        reject(e);
+                    }
+                });
+            })
+            .catch(reject);
     });
@@ -657,25 +765,35 @@
     var promise = new Promise(function(resolve, reject) {
-        self.ready().then(function() {
-            createTransaction(self._dbInfo, READ_WRITE, function(err, transaction) {
-                if (err) {
-                    return reject(err);
-                }
+        self
+            .ready()
+            .then(function() {
+                createTransaction(self._dbInfo, READ_WRITE, function(
+                    err,
+                    transaction
+                ) {
+                    if (err) {
+                        return reject(err);
+                    }
 
-                try {
-                    var store = transaction.objectStore(self._dbInfo.storeName);
-                    var req = store.clear();
+                    try {
+                        var store = transaction.objectStore(
+                            self._dbInfo.storeName
+                        );
+                        var req = store.clear();
 
-                    transaction.oncomplete = function() {
-                        resolve();
-                    };
+                        transaction.oncomplete = function() {
+                            resolve();
+                        };
 
-                    transaction.onabort = transaction.onerror = function() {
-                        var err = req.error ? req.error : req.transaction.error;
-                        reject(err);
-                    };
-                } catch (e) {
-                    reject(e);
-                }
-            });
-        }).catch(reject);
+                        transaction.onabort = transaction.onerror = function() {
+                            var err = req.error
+                                ? req.error
+                                : req.transaction.error;
+                            reject(err);
+                        };
+                    } catch (e) {
+                        reject(e);
+                    }
+                });
+            })
+            .catch(reject);
     });
@@ -691,24 +809,32 @@
     var promise = new Promise(function(resolve, reject) {
-        self.ready().then(function() {
-            createTransaction(self._dbInfo, READ_ONLY, function(err, transaction) {
-                if (err) {
-                    return reject(err);
-                }
+        self
+            .ready()
+            .then(function() {
+                createTransaction(self._dbInfo, READ_ONLY, function(
+                    err,
+                    transaction
+                ) {
+                    if (err) {
+                        return reject(err);
+                    }
 
-                try {
-                    var store = transaction.objectStore(self._dbInfo.storeName);
-                    var req = store.count();
+                    try {
+                        var store = transaction.objectStore(
+                            self._dbInfo.storeName
+                        );
+                        var req = store.count();
 
-                    req.onsuccess = function() {
-                        resolve(req.result);
-                    };
+                        req.onsuccess = function() {
+                            resolve(req.result);
+                        };
 
-                    req.onerror = function() {
-                        reject(req.error);
-                    };
-                } catch (e) {
-                    reject(e);
-                }
-            });
-        }).catch(reject);
+                        req.onerror = function() {
+                            reject(req.error);
+                        };
+                    } catch (e) {
+                        reject(e);
+                    }
+                });
+            })
+            .catch(reject);
     });
@@ -730,47 +856,55 @@
 
-        self.ready().then(function() {
-            createTransaction(self._dbInfo, READ_ONLY, function(err, transaction) {
-                if (err) {
-                    return reject(err);
-                }
+        self
+            .ready()
+            .then(function() {
+                createTransaction(self._dbInfo, READ_ONLY, function(
+                    err,
+                    transaction
+                ) {
+                    if (err) {
+                        return reject(err);
+                    }
 
-                try {
-                    var store = transaction.objectStore(self._dbInfo.storeName);
-                    var advanced = false;
-                    var req = store.openCursor();
+                    try {
+                        var store = transaction.objectStore(
+                            self._dbInfo.storeName
+                        );
+                        var advanced = false;
+                        var req = store.openCursor();
 
-                    req.onsuccess = function() {
-                        var cursor = req.result;
-                        if (!cursor) {
-                            // this means there weren't enough keys
-                            resolve(null);
+                        req.onsuccess = function() {
+                            var cursor = req.result;
+                            if (!cursor) {
+                                // this means there weren't enough keys
+                                resolve(null);
 
-                            return;
-                        }
+                                return;
+                            }
 
-                        if (n === 0) {
-                            // We have the first key, return it if that's what they
-                            // wanted.
-                            resolve(cursor.key);
-                        } else {
-                            if (!advanced) {
-                                // Otherwise, ask the cursor to skip ahead n
-                                // records.
-                                advanced = true;
-                                cursor.advance(n);
+                            if (n === 0) {
+                                // We have the first key, return it if that's what they
+                                // wanted.
+                                resolve(cursor.key);
                             } else {
-                                // When we get here, we've got the nth key.
-                                resolve(cursor.key);
+                                if (!advanced) {
+                                    // Otherwise, ask the cursor to skip ahead n
+                                    // records.
+                                    advanced = true;
+                                    cursor.advance(n);
+                                } else {
+                                    // When we get here, we've got the nth key.
+                                    resolve(cursor.key);
+                                }
                             }
-                        }
-                    };
+                        };
 
-                    req.onerror = function() {
-                        reject(req.error);
-                    };
-                } catch (e) {
-                    reject(e);
-                }
-            });
-        }).catch(reject);
+                        req.onerror = function() {
+                            reject(req.error);
+                        };
+                    } catch (e) {
+                        reject(e);
+                    }
+                });
+            })
+            .catch(reject);
     });
@@ -786,34 +920,184 @@
     var promise = new Promise(function(resolve, reject) {
-        self.ready().then(function() {
-            createTransaction(self._dbInfo, READ_ONLY, function(err, transaction) {
-                if (err) {
-                    return reject(err);
+        self
+            .ready()
+            .then(function() {
+                createTransaction(self._dbInfo, READ_ONLY, function(
+                    err,
+                    transaction
+                ) {
+                    if (err) {
+                        return reject(err);
+                    }
+
+                    try {
+                        var store = transaction.objectStore(
+                            self._dbInfo.storeName
+                        );
+                        var req = store.openCursor();
+                        var keys = [];
+
+                        req.onsuccess = function() {
+                            var cursor = req.result;
+
+                            if (!cursor) {
+                                resolve(keys);
+                                return;
+                            }
+
+                            keys.push(cursor.key);
+                            cursor.continue();
+                        };
+
+                        req.onerror = function() {
+                            reject(req.error);
+                        };
+                    } catch (e) {
+                        reject(e);
+                    }
+                });
+            })
+            .catch(reject);
+    });
+
+    executeCallback(promise, callback);
+    return promise;
+}
+
+function dropInstance(options, callback) {
+    callback = getCallback.apply(this, arguments);
+
+    var currentConfig = this.config();
+    options = (typeof options !== 'function' && options) || {};
+    if (!options.name) {
+        options.name = options.name || currentConfig.name;
+        options.storeName = options.storeName || currentConfig.storeName;
+    }
+
+    var self = this;
+    var promise;
+    if (!options.name) {
+        promise = Promise.reject('Invalid arguments');
+    } else {
+        const isCurrentDb =
+            options.name === currentConfig.name && self._dbInfo.db;
+
+        const dbPromise = isCurrentDb
+            ? Promise.resolve(self._dbInfo.db)
+            : _getOriginalConnection(options).then(db => {
+                  const dbContext = dbContexts[options.name];
+                  const forages = dbContext.forages;
+                  dbContext.db = db;
+                  for (var i = 0; i < forages.length; i++) {
+                      forages[i]._dbInfo.db = db;
+                  }
+                  return db;
+              });
+
+        if (!options.storeName) {
+            promise = dbPromise.then(db => {
+                _deferReadiness(options);
+
+                const dbContext = dbContexts[options.name];
+                const forages = dbContext.forages;
+
+                db.close();
+                for (var i = 0; i < forages.length; i++) {
+                    const forage = forages[i];
+                    forage._dbInfo.db = null;
                 }
 
-                try {
-                    var store = transaction.objectStore(self._dbInfo.storeName);
-                    var req = store.openCursor();
-                    var keys = [];
+                const dropDBPromise = new Promise((resolve, reject) => {
+                    var req = idb.deleteDatabase(options.name);
 
-                    req.onsuccess = function() {
-                        var cursor = req.result;
+                    req.onerror = req.onblocked = err => {
+                        const db = req.result;
+                        if (db) {
+                            db.close();
+                        }
+                        reject(err);
+                    };
 
-                        if (!cursor) {
-                            resolve(keys);
-                            return;
+                    req.onsuccess = () => {
+                        const db = req.result;
+                        if (db) {
+                            db.close();
                         }
+                        resolve(db);
+                    };
+                });
 
-                        keys.push(cursor.key);
-                        cursor.continue();
+                return dropDBPromise
+                    .then(db => {
+                        dbContext.db = db;
+                        for (var i = 0; i < forages.length; i++) {
+                            const forage = forages[i];
+                            _advanceReadiness(forage._dbInfo);
+                        }
+                    })
+                    .catch(err => {
+                        (
+                            _rejectReadiness(options, err) || Promise.resolve()
+                        ).catch(() => {});
+                        throw err;
+                    });
+            });
+        } else {
+            promise = dbPromise.then(db => {
+                if (!db.objectStoreNames.contains(options.storeName)) {
+                    return;
+                }
+
+                const newVersion = db.version + 1;
+
+                _deferReadiness(options);
+
+                const dbContext = dbContexts[options.name];
+                const forages = dbContext.forages;
+
+                db.close();
+                for (let i = 0; i < forages.length; i++) {
+                    const forage = forages[i];
+                    forage._dbInfo.db = null;
+                    forage._dbInfo.version = newVersion;
+                }
+
+                const dropObjectPromise = new Promise((resolve, reject) => {
+                    const req = idb.open(options.name, newVersion);
+
+                    req.onerror = err => {
+                        const db = req.result;
+                        db.close();
+                        reject(err);
                     };
 
-                    req.onerror = function() {
-                        reject(req.error);
+                    req.onupgradeneeded = () => {
+                        var db = req.result;
+                        db.deleteObjectStore(options.storeName);
                     };
-                } catch (e) {
-                    reject(e);
-                }
+
+                    req.onsuccess = () => {
+                        const db = req.result;
+                        db.close();
+                        resolve(db);
+                    };
+                });
+
+                return dropObjectPromise
+                    .then(db => {
+                        dbContext.db = db;
+                        for (let j = 0; j < forages.length; j++) {
+                            const forage = forages[j];
+                            forage._dbInfo.db = db;
+                            _advanceReadiness(forage._dbInfo);
+                        }
+                    })
+                    .catch(err => {
+                        (
+                            _rejectReadiness(options, err) || Promise.resolve()
+                        ).catch(() => {});
+                        throw err;
+                    });
             });
-        }).catch(reject);
-    });
+        }
+    }
 
@@ -835,4 +1119,5 @@ executeCallback(promise, callback);
     key: key,
-    keys: keys
+    keys: keys,
+    dropInstance: dropInstance
 };
 export default asyncStorage;

src/drivers/localstorage.js

@@ -11,3 +11,13 @@ // If IndexedDB isn't available, we'll fall back to localStorage.
 import normalizeKey from '../utils/normalizeKey';
+import getCallback from '../utils/getCallback';
 
+function _getKeyPrefix(options, defaultConfig) {
+    var keyPrefix = options.name + '/';
+
+    if (options.storeName !== defaultConfig.storeName) {
+        keyPrefix += options.storeName + '/';
+    }
+    return keyPrefix;
+}
+
 // Check if localStorage throws when saving an item
@@ -45,8 +55,4 @@ function checkIfLocalStorageThrows() {
 
-    dbInfo.keyPrefix = dbInfo.name + '/';
+    dbInfo.keyPrefix = _getKeyPrefix(options, self._defaultConfig);
 
-    if (dbInfo.storeName !== self._defaultConfig.storeName) {
-        dbInfo.keyPrefix += dbInfo.storeName + '/';
-    }
-
     if (!_isLocalStorageUsable()) {
@@ -142,6 +148,9 @@ return Promise.reject();
 
-            value = iterator(value, key.substring(keyPrefixLength),
-                             iterationNumber++);
+            value = iterator(
+                value,
+                key.substring(keyPrefixLength),
+                iterationNumber++
+            );
 
-            if (value !== void(0)) {
+            if (value !== void 0) {
                 return value;
@@ -258,4 +267,6 @@ }
                         // TODO: Make this a specific error/event.
-                        if (e.name === 'QuotaExceededError' ||
-                            e.name === 'NS_ERROR_DOM_QUOTA_REACHED') {
+                        if (
+                            e.name === 'QuotaExceededError' ||
+                            e.name === 'NS_ERROR_DOM_QUOTA_REACHED'
+                        ) {
                             reject(e);
@@ -274,2 +285,38 @@ }
 
+function dropInstance(options, callback) {
+    callback = getCallback.apply(this, arguments);
+
+    options = (typeof options !== 'function' && options) || {};
+    if (!options.name) {
+        var currentConfig = this.config();
+        options.name = options.name || currentConfig.name;
+        options.storeName = options.storeName || currentConfig.storeName;
+    }
+
+    var self = this;
+    var promise;
+    if (!options.name) {
+        promise = Promise.reject('Invalid arguments');
+    } else {
+        promise = new Promise(function(resolve) {
+            if (!options.storeName) {
+                resolve(`${options.name}/`);
+            } else {
+                resolve(_getKeyPrefix(options, self._defaultConfig));
+            }
+        }).then(function(keyPrefix) {
+            for (var i = localStorage.length - 1; i >= 0; i--) {
+                var key = localStorage.key(i);
+
+                if (key.indexOf(keyPrefix) === 0) {
+                    localStorage.removeItem(key);
+                }
+            }
+        });
+    }
+
+    executeCallback(promise, callback);
+    return promise;
+}
+
 var localStorageWrapper = {
@@ -286,5 +333,6 @@ _driver: 'localStorageWrapper',
     key: key,
-    keys: keys
+    keys: keys,
+    dropInstance: dropInstance
 };
 
 export default localStorageWrapper;

src/drivers/websql.js

@@ -6,2 +6,3 @@ import isWebSQLValid from '../utils/isWebSQLValid';
 import normalizeKey from '../utils/normalizeKey';
+import getCallback from '../utils/getCallback';
 
@@ -17,2 +18,13 @@ /*
  */
+
+function createDbTable(t, dbInfo, callback, errorCallback) {
+    t.executeSql(
+        `CREATE TABLE IF NOT EXISTS ${dbInfo.storeName} ` +
+            '(id INTEGER PRIMARY KEY, key unique, value)',
+        [],
+        callback,
+        errorCallback
+    );
+}
+
 // Open the WebSQL database (automatically creates one if one didn't
@@ -28,4 +40,6 @@ // previously exist), using any options set in the config.
         for (var i in options) {
-            dbInfo[i] = typeof(options[i]) !== 'string' ?
-                options[i].toString() : options[i];
+            dbInfo[i] =
+                typeof options[i] !== 'string'
+                    ? options[i].toString()
+                    : options[i];
         }
@@ -38,4 +52,8 @@ }
         try {
-            dbInfo.db = openDatabase(dbInfo.name, String(dbInfo.version),
-                                     dbInfo.description, dbInfo.size);
+            dbInfo.db = openDatabase(
+                dbInfo.name,
+                String(dbInfo.version),
+                dbInfo.description,
+                dbInfo.size
+            );
         } catch (e) {
@@ -47,12 +65,14 @@ return reject(e);
         dbInfo.db.transaction(function(t) {
-            t.executeSql(
-                'CREATE TABLE IF NOT EXISTS ' + dbInfo.storeName +
-                ' (id INTEGER PRIMARY KEY, key unique, value)', [],
+            createDbTable(
+                t,
+                dbInfo,
                 function() {
                     self._dbInfo = dbInfo;
                     resolve();
-                }, function(t, error) {
+                },
+                function(t, error) {
                     reject(error);
-                });
-        });
+                }
+            );
+        }, reject);
     });
@@ -64,2 +84,44 @@
 
+function tryExecuteSql(t, dbInfo, sqlStatement, args, callback, errorCallback) {
+    t.executeSql(
+        sqlStatement,
+        args,
+        callback,
+        function(t, error) {
+            if (error.code === error.SYNTAX_ERR) {
+                t.executeSql(
+                    'SELECT name FROM sqlite_master ' +
+                        "WHERE type='table' AND name = ?",
+                    [name],
+                    function(t, results) {
+                        if (!results.rows.length) {
+                            // if the table is missing (was deleted)
+                            // re-create it table and retry
+                            createDbTable(
+                                t,
+                                dbInfo,
+                                function() {
+                                    t.executeSql(
+                                        sqlStatement,
+                                        args,
+                                        callback,
+                                        errorCallback
+                                    );
+                                },
+                                errorCallback
+                            );
+                        } else {
+                            errorCallback(t, error);
+                        }
+                    },
+                    errorCallback
+                );
+            } else {
+                errorCallback(t, error);
+            }
+        },
+        errorCallback
+    );
+}
+
 function getItem(key, callback) {
@@ -71,25 +133,34 @@ var self = this;
     var promise = new Promise(function(resolve, reject) {
-        self.ready().then(function() {
-            var dbInfo = self._dbInfo;
-            dbInfo.db.transaction(function(t) {
-                t.executeSql(
-                    'SELECT * FROM ' + dbInfo.storeName +
-                    ' WHERE key = ? LIMIT 1', [key],
-                    function(t, results) {
-                        var result = results.rows.length ?
-                            results.rows.item(0).value : null;
+        self
+            .ready()
+            .then(function() {
+                var dbInfo = self._dbInfo;
+                dbInfo.db.transaction(function(t) {
+                    tryExecuteSql(
+                        t,
+                        dbInfo,
+                        `SELECT * FROM ${
+                            dbInfo.storeName
+                        } WHERE key = ? LIMIT 1`,
+                        [key],
+                        function(t, results) {
+                            var result = results.rows.length
+                                ? results.rows.item(0).value
+                                : null;
 
-                        // Check to see if this is serialized content we need to
-                        // unpack.
-                        if (result) {
-                            result = dbInfo.serializer.deserialize(result);
+                            // Check to see if this is serialized content we need to
+                            // unpack.
+                            if (result) {
+                                result = dbInfo.serializer.deserialize(result);
+                            }
+
+                            resolve(result);
+                        },
+                        function(t, error) {
+                            reject(error);
                         }
-
-                        resolve(result);
-                    }, function(t, error) {
-
-                        reject(error);
-                    });
-            });
-        }).catch(reject);
+                    );
+                });
+            })
+            .catch(reject);
     });
@@ -105,38 +176,48 @@
     var promise = new Promise(function(resolve, reject) {
-        self.ready().then(function() {
-            var dbInfo = self._dbInfo;
+        self
+            .ready()
+            .then(function() {
+                var dbInfo = self._dbInfo;
 
-            dbInfo.db.transaction(function(t) {
-                t.executeSql(
-                    'SELECT * FROM ' + dbInfo.storeName, [],
-                    function(t, results) {
-                        var rows = results.rows;
-                        var length = rows.length;
+                dbInfo.db.transaction(function(t) {
+                    tryExecuteSql(
+                        t,
+                        dbInfo,
+                        `SELECT * FROM ${dbInfo.storeName}`,
+                        [],
+                        function(t, results) {
+                            var rows = results.rows;
+                            var length = rows.length;
 
-                        for (var i = 0; i < length; i++) {
-                            var item = rows.item(i);
-                            var result = item.value;
+                            for (var i = 0; i < length; i++) {
+                                var item = rows.item(i);
+                                var result = item.value;
 
-                            // Check to see if this is serialized content
-                            // we need to unpack.
-                            if (result) {
-                                result = dbInfo.serializer.deserialize(result);
-                            }
+                                // Check to see if this is serialized content
+                                // we need to unpack.
+                                if (result) {
+                                    result = dbInfo.serializer.deserialize(
+                                        result
+                                    );
+                                }
 
-                            result = iterator(result, item.key, i + 1);
+                                result = iterator(result, item.key, i + 1);
 
-                            // void(0) prevents problems with redefinition
-                            // of `undefined`.
-                            if (result !== void(0)) {
-                                resolve(result);
-                                return;
+                                // void(0) prevents problems with redefinition
+                                // of `undefined`.
+                                if (result !== void 0) {
+                                    resolve(result);
+                                    return;
+                                }
                             }
+
+                            resolve();
+                        },
+                        function(t, error) {
+                            reject(error);
                         }
-
-                        resolve();
-                    }, function(t, error) {
-                        reject(error);
-                    });
-            });
-        }).catch(reject);
+                    );
+                });
+            })
+            .catch(reject);
     });
@@ -154,50 +235,67 @@
     var promise = new Promise(function(resolve, reject) {
-        self.ready().then(function() {
-            // The localStorage API doesn't return undefined values in an
-            // "expected" way, so undefined is always cast to null in all
-            // drivers. See: https://github.com/mozilla/localForage/pull/42
-            if (value === undefined) {
-                value = null;
-            }
+        self
+            .ready()
+            .then(function() {
+                // The localStorage API doesn't return undefined values in an
+                // "expected" way, so undefined is always cast to null in all
+                // drivers. See: https://github.com/mozilla/localForage/pull/42
+                if (value === undefined) {
+                    value = null;
+                }
 
-            // Save the original value to pass to the callback.
-            var originalValue = value;
+                // Save the original value to pass to the callback.
+                var originalValue = value;
 
-            var dbInfo = self._dbInfo;
-            dbInfo.serializer.serialize(value, function(value, error) {
-                if (error) {
-                    reject(error);
-                } else {
-                    dbInfo.db.transaction(function(t) {
-                        t.executeSql(
-                            'INSERT OR REPLACE INTO ' +
-                            dbInfo.storeName +
-                            ' (key, value) VALUES (?, ?)',
-                            [key, value],
-                            function() {
-                                resolve(originalValue);
-                            }, function(t, error) {
-                                reject(error);
-                            });
-                    }, function(sqlError) {
-                        // The transaction failed; check
-                        // to see if it's a quota error.
-                        if (sqlError.code === sqlError.QUOTA_ERR) {
-                            // We reject the callback outright for now, but
-                            // it's worth trying to re-run the transaction.
-                            // Even if the user accepts the prompt to use
-                            // more storage on Safari, this error will
-                            // be called.
-                            //
-                            // Try to re-run the transaction.
-                            if (retriesLeft > 0) {
-                                resolve(_setItem.apply(self, [key, originalValue, callback, retriesLeft - 1]));
-                                return;
+                var dbInfo = self._dbInfo;
+                dbInfo.serializer.serialize(value, function(value, error) {
+                    if (error) {
+                        reject(error);
+                    } else {
+                        dbInfo.db.transaction(
+                            function(t) {
+                                tryExecuteSql(
+                                    t,
+                                    dbInfo,
+                                    `INSERT OR REPLACE INTO ${
+                                        dbInfo.storeName
+                                    } ` + '(key, value) VALUES (?, ?)',
+                                    [key, value],
+                                    function() {
+                                        resolve(originalValue);
+                                    },
+                                    function(t, error) {
+                                        reject(error);
+                                    }
+                                );
+                            },
+                            function(sqlError) {
+                                // The transaction failed; check
+                                // to see if it's a quota error.
+                                if (sqlError.code === sqlError.QUOTA_ERR) {
+                                    // We reject the callback outright for now, but
+                                    // it's worth trying to re-run the transaction.
+                                    // Even if the user accepts the prompt to use
+                                    // more storage on Safari, this error will
+                                    // be called.
+                                    //
+                                    // Try to re-run the transaction.
+                                    if (retriesLeft > 0) {
+                                        resolve(
+                                            _setItem.apply(self, [
+                                                key,
+                                                originalValue,
+                                                callback,
+                                                retriesLeft - 1
+                                            ])
+                                        );
+                                        return;
+                                    }
+                                    reject(sqlError);
+                                }
                             }
-                            reject(sqlError);
-                        }
-                    });
-                }
-            });
-        }).catch(reject);
+                        );
+                    }
+                });
+            })
+            .catch(reject);
     });
@@ -219,15 +317,22 @@
     var promise = new Promise(function(resolve, reject) {
-        self.ready().then(function() {
-            var dbInfo = self._dbInfo;
-            dbInfo.db.transaction(function(t) {
-                t.executeSql(
-                    'DELETE FROM ' + dbInfo.storeName +
-                    ' WHERE key = ?', [key],
-                    function() {
-                        resolve();
-                    }, function(t, error) {
-                        reject(error);
-                    });
-            });
-        }).catch(reject);
+        self
+            .ready()
+            .then(function() {
+                var dbInfo = self._dbInfo;
+                dbInfo.db.transaction(function(t) {
+                    tryExecuteSql(
+                        t,
+                        dbInfo,
+                        `DELETE FROM ${dbInfo.storeName} WHERE key = ?`,
+                        [key],
+                        function() {
+                            resolve();
+                        },
+                        function(t, error) {
+                            reject(error);
+                        }
+                    );
+                });
+            })
+            .catch(reject);
     });
@@ -245,14 +350,22 @@
     var promise = new Promise(function(resolve, reject) {
-        self.ready().then(function() {
-            var dbInfo = self._dbInfo;
-            dbInfo.db.transaction(function(t) {
-                t.executeSql(
-                    'DELETE FROM ' + dbInfo.storeName, [],
-                    function() {
-                        resolve();
-                    }, function(t, error) {
-                        reject(error);
-                    });
-            });
-        }).catch(reject);
+        self
+            .ready()
+            .then(function() {
+                var dbInfo = self._dbInfo;
+                dbInfo.db.transaction(function(t) {
+                    tryExecuteSql(
+                        t,
+                        dbInfo,
+                        `DELETE FROM ${dbInfo.storeName}`,
+                        [],
+                        function() {
+                            resolve();
+                        },
+                        function(t, error) {
+                            reject(error);
+                        }
+                    );
+                });
+            })
+            .catch(reject);
     });
@@ -270,18 +383,24 @@
     var promise = new Promise(function(resolve, reject) {
-        self.ready().then(function() {
-            var dbInfo = self._dbInfo;
-            dbInfo.db.transaction(function(t) {
-                // Ahhh, SQL makes this one soooooo easy.
-                t.executeSql(
-                    'SELECT COUNT(key) as c FROM ' +
-                    dbInfo.storeName, [],
-                    function(t, results) {
-                        var result = results.rows.item(0).c;
-
-                        resolve(result);
-                    }, function(t, error) {
-                        reject(error);
-                    });
-            });
-        }).catch(reject);
+        self
+            .ready()
+            .then(function() {
+                var dbInfo = self._dbInfo;
+                dbInfo.db.transaction(function(t) {
+                    // Ahhh, SQL makes this one soooooo easy.
+                    tryExecuteSql(
+                        t,
+                        dbInfo,
+                        `SELECT COUNT(key) as c FROM ${dbInfo.storeName}`,
+                        [],
+                        function(t, results) {
+                            var result = results.rows.item(0).c;
+                            resolve(result);
+                        },
+                        function(t, error) {
+                            reject(error);
+                        }
+                    );
+                });
+            })
+            .catch(reject);
     });
@@ -304,17 +423,27 @@
     var promise = new Promise(function(resolve, reject) {
-        self.ready().then(function() {
-            var dbInfo = self._dbInfo;
-            dbInfo.db.transaction(function(t) {
-                t.executeSql(
-                    'SELECT key FROM ' + dbInfo.storeName +
-                    ' WHERE id = ? LIMIT 1', [n + 1],
-                    function(t, results) {
-                        var result = results.rows.length ?
-                            results.rows.item(0).key : null;
-                        resolve(result);
-                    }, function(t, error) {
-                        reject(error);
-                    });
-            });
-        }).catch(reject);
+        self
+            .ready()
+            .then(function() {
+                var dbInfo = self._dbInfo;
+                dbInfo.db.transaction(function(t) {
+                    tryExecuteSql(
+                        t,
+                        dbInfo,
+                        `SELECT key FROM ${
+                            dbInfo.storeName
+                        } WHERE id = ? LIMIT 1`,
+                        [n + 1],
+                        function(t, results) {
+                            var result = results.rows.length
+                                ? results.rows.item(0).key
+                                : null;
+                            resolve(result);
+                        },
+                        function(t, error) {
+                            reject(error);
+                        }
+                    );
+                });
+            })
+            .catch(reject);
     });
@@ -330,22 +459,147 @@
     var promise = new Promise(function(resolve, reject) {
-        self.ready().then(function() {
-            var dbInfo = self._dbInfo;
-            dbInfo.db.transaction(function(t) {
+        self
+            .ready()
+            .then(function() {
+                var dbInfo = self._dbInfo;
+                dbInfo.db.transaction(function(t) {
+                    tryExecuteSql(
+                        t,
+                        dbInfo,
+                        `SELECT key FROM ${dbInfo.storeName}`,
+                        [],
+                        function(t, results) {
+                            var keys = [];
+
+                            for (var i = 0; i < results.rows.length; i++) {
+                                keys.push(results.rows.item(i).key);
+                            }
+
+                            resolve(keys);
+                        },
+                        function(t, error) {
+                            reject(error);
+                        }
+                    );
+                });
+            })
+            .catch(reject);
+    });
+
+    executeCallback(promise, callback);
+    return promise;
+}
+
+// https://www.w3.org/TR/webdatabase/#databases
+// > There is no way to enumerate or delete the databases available for an origin from this API.
+function getAllStoreNames(db) {
+    return new Promise(function(resolve, reject) {
+        db.transaction(
+            function(t) {
                 t.executeSql(
-                    'SELECT key FROM ' + dbInfo.storeName, [],
+                    'SELECT name FROM sqlite_master ' +
+                        "WHERE type='table' AND name <> '__WebKitDatabaseInfoTable__'",
+                    [],
                     function(t, results) {
-                        var keys = [];
+                        var storeNames = [];
 
                         for (var i = 0; i < results.rows.length; i++) {
-                            keys.push(results.rows.item(i).key);
+                            storeNames.push(results.rows.item(i).name);
                         }
 
-                        resolve(keys);
-                    }, function(t, error) {
+                        resolve({
+                            db,
+                            storeNames
+                        });
+                    },
+                    function(t, error) {
                         reject(error);
-                    });
-            });
-        }).catch(reject);
+                    }
+                );
+            },
+            function(sqlError) {
+                reject(sqlError);
+            }
+        );
     });
+}
 
+function dropInstance(options, callback) {
+    callback = getCallback.apply(this, arguments);
+
+    var currentConfig = this.config();
+    options = (typeof options !== 'function' && options) || {};
+    if (!options.name) {
+        options.name = options.name || currentConfig.name;
+        options.storeName = options.storeName || currentConfig.storeName;
+    }
+
+    var self = this;
+    var promise;
+    if (!options.name) {
+        promise = Promise.reject('Invalid arguments');
+    } else {
+        promise = new Promise(function(resolve) {
+            var db;
+            if (options.name === currentConfig.name) {
+                // use the db reference of the current instance
+                db = self._dbInfo.db;
+            } else {
+                db = openDatabase(options.name, '', '', 0);
+            }
+
+            if (!options.storeName) {
+                // drop all database tables
+                resolve(getAllStoreNames(db));
+            } else {
+                resolve({
+                    db,
+                    storeNames: [options.storeName]
+                });
+            }
+        }).then(function(operationInfo) {
+            return new Promise(function(resolve, reject) {
+                operationInfo.db.transaction(
+                    function(t) {
+                        function dropTable(storeName) {
+                            return new Promise(function(resolve, reject) {
+                                t.executeSql(
+                                    `DROP TABLE IF EXISTS ${storeName}`,
+                                    [],
+                                    function() {
+                                        resolve();
+                                    },
+                                    function(t, error) {
+                                        reject(error);
+                                    }
+                                );
+                            });
+                        }
+
+                        var operations = [];
+                        for (
+                            var i = 0, len = operationInfo.storeNames.length;
+                            i < len;
+                            i++
+                        ) {
+                            operations.push(
+                                dropTable(operationInfo.storeNames[i])
+                            );
+                        }
+
+                        Promise.all(operations)
+                            .then(function() {
+                                resolve();
+                            })
+                            .catch(function(e) {
+                                reject(e);
+                            });
+                    },
+                    function(sqlError) {
+                        reject(sqlError);
+                    }
+                );
+            });
+        });
+    }
+
     executeCallback(promise, callback);
@@ -366,5 +620,6 @@ return promise;
     key: key,
-    keys: keys
+    keys: keys,
+    dropInstance: dropInstance
 };
 
 export default webSQLStorage;

src/localforage.js

@@ -6,3 +6,5 @@ import idbDriver from './drivers/indexeddb';
 import Promise from './utils/promise';
+import executeCallback from './utils/executeCallback';
 import executeTwoCallbacks from './utils/executeTwoCallbacks';
+import includes from './utils/includes';
 import isArray from './utils/isArray';
@@ -28,2 +30,4 @@
 
+const OptionalDriverMethods = ['dropInstance'];
+
 const LibraryMethods = [
@@ -38,3 +42,3 @@ 'clear',
     'setItem'
-];
+].concat(OptionalDriverMethods);
 
@@ -56,3 +60,6 @@ const DefaultConfig = {
         return localForageInstance.ready().then(function() {
-            return localForageInstance[libraryMethod].apply(localForageInstance, _args);
+            return localForageInstance[libraryMethod].apply(
+                localForageInstance,
+                _args
+            );
         });
@@ -118,8 +125,9 @@ };
         // config values.
-        if (typeof(options) === 'object') {
+        if (typeof options === 'object') {
             // If localforage is ready and fully initialized, we can't set
             // any new configuration values. Instead, we return an error.
             if (this._ready) {
-                return new Error('Can\'t call config() after localforage ' +
-                    'has been used.');
+                return new Error(
+                    "Can't call config() after localforage " + 'has been used.'
+                );
             }
@@ -146,3 +154,3 @@
             return true;
-        } else if (typeof(options) === 'string') {
+        } else if (typeof options === 'string') {
             return this._config[options];
@@ -162,3 +170,3 @@ } else {
                     'Custom driver not compliant; see ' +
-                    'https://mozilla.github.io/localForage/#definedriver'
+                        'https://mozilla.github.io/localForage/#definedriver'
                 );
@@ -175,5 +183,14 @@
                 for (let i = 0, len = driverMethods.length; i < len; i++) {
-                    const customDriverMethod = driverMethods[i];
-                    if (!customDriverMethod || !driverObject[customDriverMethod] ||
-                        typeof driverObject[customDriverMethod] !== 'function') {
+                    const driverMethodName = driverMethods[i];
+
+                    // when the property is there,
+                    // it should be a method even when optional
+                    const isRequired = !includes(
+                        OptionalDriverMethods,
+                        driverMethodName
+                    );
+                    if (
+                        (isRequired || driverObject[driverMethodName]) &&
+                        typeof driverObject[driverMethodName] !== 'function'
+                    ) {
                         reject(complianceError);
@@ -184,5 +201,40 @@ return;
 
+                const configureMissingMethods = function() {
+                    const methodNotImplementedFactory = function(methodName) {
+                        return function() {
+                            const error = new Error(
+                                `Method ${methodName} is not implemented by the current driver`
+                            );
+                            const promise = Promise.reject(error);
+                            executeCallback(
+                                promise,
+                                arguments[arguments.length - 1]
+                            );
+                            return promise;
+                        };
+                    };
+
+                    for (
+                        let i = 0, len = OptionalDriverMethods.length;
+                        i < len;
+                        i++
+                    ) {
+                        const optionalDriverMethod = OptionalDriverMethods[i];
+                        if (!driverObject[optionalDriverMethod]) {
+                            driverObject[
+                                optionalDriverMethod
+                            ] = methodNotImplementedFactory(
+                                optionalDriverMethod
+                            );
+                        }
+                    }
+                };
+
+                configureMissingMethods();
+
                 const setDriverSupport = function(support) {
                     if (DefinedDrivers[driverName]) {
-                        console.info(`Redefining LocalForage driver: ${driverName}`);
+                        console.info(
+                            `Redefining LocalForage driver: ${driverName}`
+                        );
                     }
@@ -198,3 +250,6 @@ DefinedDrivers[driverName] = driverObject;
                 if ('_support' in driverObject) {
-                    if (driverObject._support && typeof driverObject._support === 'function') {
+                    if (
+                        driverObject._support &&
+                        typeof driverObject._support === 'function'
+                    ) {
                         driverObject._support().then(setDriverSupport, reject);
@@ -221,5 +276,5 @@ } else {
     getDriver(driverName, callback, errorCallback) {
-        const getDriverPromise = DefinedDrivers[driverName] ?
-            Promise.resolve(DefinedDrivers[driverName]) :
-            Promise.reject(new Error('Driver not found.'));
+        const getDriverPromise = DefinedDrivers[driverName]
+            ? Promise.resolve(DefinedDrivers[driverName])
+            : Promise.reject(new Error('Driver not found.'));
 
@@ -284,3 +339,4 @@ executeTwoCallbacks(getDriverPromise, callback, errorCallback);
 
-                        return self.getDriver(driverName)
+                        return self
+                            .getDriver(driverName)
                             .then(extendSelfWithDriver)
@@ -291,3 +347,5 @@ .catch(driverPromiseLoop);
                     setDriverToConfig();
-                    const error = new Error('No available storage method found.');
+                    const error = new Error(
+                        'No available storage method found.'
+                    );
                     self._driverSet = Promise.reject(error);
@@ -304,13 +362,14 @@ return self._driverSet;
         // race condition to set _dbInfo
-        const oldDriverSetDone = this._driverSet !== null ?
-            this._driverSet.catch(() => Promise.resolve()) :
-            Promise.resolve();
+        const oldDriverSetDone =
+            this._driverSet !== null
+                ? this._driverSet.catch(() => Promise.resolve())
+                : Promise.resolve();
 
-        this._driverSet = oldDriverSetDone.then(() => {
-            const driverName = supportedDrivers[0];
-            self._dbInfo = null;
-            self._ready = null;
+        this._driverSet = oldDriverSetDone
+            .then(() => {
+                const driverName = supportedDrivers[0];
+                self._dbInfo = null;
+                self._ready = null;
 
-            return self.getDriver(driverName)
-                .then(driver => {
+                return self.getDriver(driverName).then(driver => {
                     self._driver = driver._driver;
@@ -321,8 +380,9 @@ setDriverToConfig();
                 });
-        }).catch(() => {
-            setDriverToConfig();
-            const error = new Error('No available storage method found.');
-            self._driverSet = Promise.reject(error);
-            return self._driverSet;
-        });
+            })
+            .catch(() => {
+                setDriverToConfig();
+                const error = new Error('No available storage method found.');
+                self._driverSet = Promise.reject(error);
+                return self._driverSet;
+            });
 
@@ -329,0 +389,0 @@ executeTwoCallbacks(this._driverSet, callback, errorCallback);

src/utils/createBlob.js

@@ -17,6 +17,10 @@ // Abstracts constructing a Blob object, so it also works in older
         }
-        var Builder = typeof BlobBuilder !== 'undefined' ? BlobBuilder :
-            typeof MSBlobBuilder !== 'undefined' ? MSBlobBuilder :
-            typeof MozBlobBuilder !== 'undefined' ? MozBlobBuilder :
-            WebKitBlobBuilder;
+        var Builder =
+            typeof BlobBuilder !== 'undefined'
+                ? BlobBuilder
+                : typeof MSBlobBuilder !== 'undefined'
+                  ? MSBlobBuilder
+                  : typeof MozBlobBuilder !== 'undefined'
+                    ? MozBlobBuilder
+                    : WebKitBlobBuilder;
         var builder = new Builder();
@@ -23,0 +27,0 @@ for (var i = 0; i < parts.length; i += 1) {

src/utils/executeCallback.js

 function executeCallback(promise, callback) {
     if (callback) {
-        promise.then(function(result) {
-            callback(null, result);
-        }, function(error) {
-            callback(error);
-        });
+        promise.then(
+            function(result) {
+                callback(null, result);
+            },
+            function(error) {
+                callback(error);
+            }
+        );
     }
@@ -9,0 +12,0 @@ }

src/utils/isArray.js

@@ -1,5 +0,7 @@
-const isArray = Array.isArray || function(arg) {
-    return Object.prototype.toString.call(arg) === '[object Array]';
-};
+const isArray =
+    Array.isArray ||
+    function(arg) {
+        return Object.prototype.toString.call(arg) === '[object Array]';
+    };
 
 export default isArray;

src/utils/isIndexedDBValid.js

@@ -14,19 +14,23 @@ import idb from './idb';
         // as Safari. Oh the lulz...
-        var isSafari = typeof openDatabase !== 'undefined' &&
-        /(Safari|iPhone|iPad|iPod)/.test(navigator.userAgent) &&
-        !/Chrome/.test(navigator.userAgent) &&
-        !/BlackBerry/.test(navigator.platform);
+        var isSafari =
+            typeof openDatabase !== 'undefined' &&
+            /(Safari|iPhone|iPad|iPod)/.test(navigator.userAgent) &&
+            !/Chrome/.test(navigator.userAgent) &&
+            !/BlackBerry/.test(navigator.platform);
 
-        var hasFetch = typeof fetch === 'function' &&
-        fetch.toString().indexOf('[native code') !== -1;
+        var hasFetch =
+            typeof fetch === 'function' &&
+            fetch.toString().indexOf('[native code') !== -1;
 
         // Safari <10.1 does not meet our requirements for IDB support (#5572)
         // since Safari 10.1 shipped with fetch, we can use that to detect it
-        return (!isSafari || hasFetch) &&
-        typeof indexedDB !== 'undefined' &&
-        // some outdated implementations of IDB that appear on Samsung
-        // and HTC Android devices <4.4 are missing IDBKeyRange
-        // See: https://github.com/mozilla/localForage/issues/128
-        // See: https://github.com/mozilla/localForage/issues/272
-        typeof IDBKeyRange !== 'undefined';
+        return (
+            (!isSafari || hasFetch) &&
+            typeof indexedDB !== 'undefined' &&
+            // some outdated implementations of IDB that appear on Samsung
+            // and HTC Android devices <4.4 are missing IDBKeyRange
+            // See: https://github.com/mozilla/localForage/issues/128
+            // See: https://github.com/mozilla/localForage/issues/272
+            typeof IDBKeyRange !== 'undefined'
+        );
     } catch (e) {
@@ -33,0 +37,0 @@ return false;

src/utils/serializer.js

@@ -7,3 +7,4 @@ /* eslint-disable no-bitwise */
 // verbose ways of binary <-> string data storage.
-var BASE_CHARS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
+var BASE_CHARS =
+    'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
 
@@ -28,4 +29,4 @@ var BLOB_TYPE_PREFIX = '~~local_forage_type~';
 var TYPE_FLOAT64ARRAY = 'fl64';
-var TYPE_SERIALIZED_MARKER_LENGTH = SERIALIZED_MARKER_LENGTH +
-    TYPE_ARRAYBUFFER.length;
+var TYPE_SERIALIZED_MARKER_LENGTH =
+    SERIALIZED_MARKER_LENGTH + TYPE_ARRAYBUFFER.length;
 
@@ -78,10 +79,12 @@ var toString = Object.prototype.toString;
         base64String += BASE_CHARS[((bytes[i] & 3) << 4) | (bytes[i + 1] >> 4)];
-        base64String += BASE_CHARS[((bytes[i + 1] & 15) << 2) | (bytes[i + 2] >> 6)];
+        base64String +=
+            BASE_CHARS[((bytes[i + 1] & 15) << 2) | (bytes[i + 2] >> 6)];
         base64String += BASE_CHARS[bytes[i + 2] & 63];
     }
 
-    if ((bytes.length % 3) === 2) {
+    if (bytes.length % 3 === 2) {
         base64String = base64String.substring(0, base64String.length - 1) + '=';
     } else if (bytes.length % 3 === 1) {
-        base64String = base64String.substring(0, base64String.length - 2) + '==';
+        base64String =
+            base64String.substring(0, base64String.length - 2) + '==';
     }
@@ -105,5 +108,8 @@
     // TODO: See why those tests fail and use a better solution.
-    if (value && (valueType === '[object ArrayBuffer]' ||
-        value.buffer &&
-        toString.call(value.buffer) === '[object ArrayBuffer]')) {
+    if (
+        value &&
+        (valueType === '[object ArrayBuffer]' ||
+            (value.buffer &&
+                toString.call(value.buffer) === '[object ArrayBuffer]'))
+    ) {
         // Convert binary arrays to a string and prefix the string with
@@ -150,3 +156,6 @@ // a special marker.
             // Backwards-compatible prefix for the blob type.
-            var str = BLOB_TYPE_PREFIX + value.type + '~' +
+            var str =
+                BLOB_TYPE_PREFIX +
+                value.type +
+                '~' +
                 bufferToString(this.result);
@@ -162,4 +171,3 @@
         } catch (e) {
-            console.error("Couldn't convert value into a JSON string: ",
-                          value);
+            console.error("Couldn't convert value into a JSON string: ", value);
 
@@ -191,4 +199,6 @@ callback(null, e);
     var serializedString = value.substring(TYPE_SERIALIZED_MARKER_LENGTH);
-    var type = value.substring(SERIALIZED_MARKER_LENGTH,
-                               TYPE_SERIALIZED_MARKER_LENGTH);
+    var type = value.substring(
+        SERIALIZED_MARKER_LENGTH,
+        TYPE_SERIALIZED_MARKER_LENGTH
+    );
 
@@ -211,3 +221,3 @@ var blobType;
         case TYPE_BLOB:
-            return createBlob([buffer], {type: blobType});
+            return createBlob([buffer], { type: blobType });
         case TYPE_INT8ARRAY:
@@ -214,0 +224,0 @@ return new Int8Array(buffer);

test/dummyStorageDriver.js

@@ -9,3 +9,3 @@ (function() {
         var self = this;
-        
+
         var dbInfo = {};
@@ -39,4 +39,4 @@ if (options) {
     var TYPE_FLOAT64ARRAY = 'fl64';
-    var TYPE_SERIALIZED_MARKER_LENGTH = SERIALIZED_MARKER_LENGTH +
-                                        TYPE_ARRAYBUFFER.length;
+    var TYPE_SERIALIZED_MARKER_LENGTH =
+        SERIALIZED_MARKER_LENGTH + TYPE_ARRAYBUFFER.length;
 
@@ -46,14 +46,17 @@ function clear(callback) {
         var promise = new Promise(function(resolve, reject) {
-            self.ready().then(function() {
-                var db = self._dbInfo.db;
+            self
+                .ready()
+                .then(function() {
+                    var db = self._dbInfo.db;
 
-                for (var key in db) {
-                    if (db.hasOwnProperty(key)) {
-                        delete db[key];
-                        // db[key] = undefined;
+                    for (var key in db) {
+                        if (db.hasOwnProperty(key)) {
+                            delete db[key];
+                            // db[key] = undefined;
+                        }
                     }
-                }
 
-                resolve();
-            }).catch(reject);
+                    resolve();
+                })
+                .catch(reject);
         });
@@ -70,4 +73,5 @@
         if (typeof key !== 'string') {
-            window.console.warn(key +
-                                ' used as a key, but it is not a string.');
+            window.console.warn(
+                key + ' used as a key, but it is not a string.'
+            );
             key = String(key);
@@ -77,16 +81,19 @@ }
         var promise = new Promise(function(resolve, reject) {
-            self.ready().then(function() {
-                try {
-                    var db = self._dbInfo.db;
-                    var result = db[key];
+            self
+                .ready()
+                .then(function() {
+                    try {
+                        var db = self._dbInfo.db;
+                        var result = db[key];
 
-                    if (result) {
-                        result = _deserialize(result);
+                        if (result) {
+                            result = _deserialize(result);
+                        }
+
+                        resolve(result);
+                    } catch (e) {
+                        reject(e);
                     }
-
-                    resolve(result);
-                } catch (e) {
-                    reject(e);
-                }
-            }).catch(reject);
+                })
+                .catch(reject);
         });
@@ -102,21 +109,24 @@
         var promise = new Promise(function(resolve, reject) {
-            self.ready().then(function() {
-                try {
-                    var db = self._dbInfo.db;
+            self
+                .ready()
+                .then(function() {
+                    try {
+                        var db = self._dbInfo.db;
 
-                    for (var key in db) {
-                        var result = db[key];
+                        for (var key in db) {
+                            var result = db[key];
 
-                        if (result) {
-                            result = _deserialize(result);
+                            if (result) {
+                                result = _deserialize(result);
+                            }
+
+                            callback(result, key);
                         }
 
-                        callback(result, key);
+                        resolve();
+                    } catch (e) {
+                        reject(e);
                     }
-
-                    resolve();
-                } catch (e) {
-                    reject(e);
-                }
-            }).catch(reject);
+                })
+                .catch(reject);
         });
@@ -131,19 +141,22 @@
         var promise = new Promise(function(resolve, reject) {
-            self.ready().then(function() {
-                var db = self._dbInfo.db;
-                var result = null;
-                var index = 0;
+            self
+                .ready()
+                .then(function() {
+                    var db = self._dbInfo.db;
+                    var result = null;
+                    var index = 0;
 
-                for (var key in db) {
-                    if (db.hasOwnProperty(key) && db[key] !== undefined) {
-                        if (n === index) {
-                            result = key;
-                            break;
+                    for (var key in db) {
+                        if (db.hasOwnProperty(key) && db[key] !== undefined) {
+                            if (n === index) {
+                                result = key;
+                                break;
+                            }
+                            index++;
                         }
-                        index++;
                     }
-                }
 
-                resolve(result);
-            }).catch(reject);
+                    resolve(result);
+                })
+                .catch(reject);
         });
@@ -158,14 +171,17 @@
         var promise = new Promise(function(resolve, reject) {
-            self.ready().then(function() {
-                var db = self._dbInfo.db;
-                var keys = [];
+            self
+                .ready()
+                .then(function() {
+                    var db = self._dbInfo.db;
+                    var keys = [];
 
-                for (var key in db) {
-                    if (db.hasOwnProperty(key)) {
-                        keys.push(key);
+                    for (var key in db) {
+                        if (db.hasOwnProperty(key)) {
+                            keys.push(key);
+                        }
                     }
-                }
 
-                resolve(keys);
-            }).catch(reject);
+                    resolve(keys);
+                })
+                .catch(reject);
         });
@@ -180,5 +196,8 @@
         var promise = new Promise(function(resolve, reject) {
-            self.keys().then(function(keys) {
-                resolve(keys.length);
-            }).catch(reject);
+            self
+                .keys()
+                .then(function(keys) {
+                    resolve(keys.length);
+                })
+                .catch(reject);
         });
@@ -195,4 +214,5 @@
         if (typeof key !== 'string') {
-            window.console.warn(key +
-                                ' used as a key, but it is not a string.');
+            window.console.warn(
+                key + ' used as a key, but it is not a string.'
+            );
             key = String(key);
@@ -202,11 +222,14 @@ }
         var promise = new Promise(function(resolve, reject) {
-            self.ready().then(function() {
-                var db = self._dbInfo.db;
-                if (db.hasOwnProperty(key)) {
-                    delete db[key];
-                    // db[key] = undefined;
-                }
+            self
+                .ready()
+                .then(function() {
+                    var db = self._dbInfo.db;
+                    if (db.hasOwnProperty(key)) {
+                        delete db[key];
+                        // db[key] = undefined;
+                    }
 
-                resolve();
-            }).catch(reject);
+                    resolve();
+                })
+                .catch(reject);
         });
@@ -223,4 +246,5 @@
         if (typeof key !== 'string') {
-            window.console.warn(key +
-                                ' used as a key, but it is not a string.');
+            window.console.warn(
+                key + ' used as a key, but it is not a string.'
+            );
             key = String(key);
@@ -230,26 +254,29 @@ }
         var promise = new Promise(function(resolve, reject) {
-            self.ready().then(function() {
-                // Convert undefined values to null.
-                // https://github.com/mozilla/localForage/pull/42
-                if (value === undefined) {
-                    value = null;
-                }
+            self
+                .ready()
+                .then(function() {
+                    // Convert undefined values to null.
+                    // https://github.com/mozilla/localForage/pull/42
+                    if (value === undefined) {
+                        value = null;
+                    }
 
-                // Save the original value to pass to the callback.
-                var originalValue = value;
+                    // Save the original value to pass to the callback.
+                    var originalValue = value;
 
-                _serialize(value, function(value, error) {
-                    if (error) {
-                        reject(error);
-                    } else {
-                        try {
-                            var db = self._dbInfo.db;
-                            db[key] = value;
-                            resolve(originalValue);
-                        } catch (e) {
-                            reject(e);
+                    _serialize(value, function(value, error) {
+                        if (error) {
+                            reject(error);
+                        } else {
+                            try {
+                                var db = self._dbInfo.db;
+                                db[key] = value;
+                                resolve(originalValue);
+                            } catch (e) {
+                                reject(e);
+                            }
                         }
-                    }
-                });
-            }).catch(reject);
+                    });
+                })
+                .catch(reject);
         });
@@ -272,5 +299,8 @@
         // TODO: See why those tests fail and use a better solution.
-        if (value && (value.toString() === '[object ArrayBuffer]' ||
-                      value.buffer &&
-                      value.buffer.toString() === '[object ArrayBuffer]')) {
+        if (
+            value &&
+            (value.toString() === '[object ArrayBuffer]' ||
+                (value.buffer &&
+                    value.buffer.toString() === '[object ArrayBuffer]'))
+        ) {
             // Convert binary arrays to a string and prefix the string with
@@ -326,4 +356,6 @@ // a special marker.
             } catch (e) {
-                window.console.error("Couldn't convert value into a JSON " +
-                                     'string: ', value);
+                window.console.error(
+                    "Couldn't convert value into a JSON " + 'string: ',
+                    value
+                );
 
@@ -334,3 +366,3 @@ callback(e);
     }
-    
+
     // _deserialize just like in LocalStorage
@@ -341,4 +373,5 @@ function _deserialize(value) {
         // done with it.
-        if (value.substring(0,
-            SERIALIZED_MARKER_LENGTH) !== SERIALIZED_MARKER) {
+        if (
+            value.substring(0, SERIALIZED_MARKER_LENGTH) !== SERIALIZED_MARKER
+        ) {
             return JSON.parse(value);
@@ -351,4 +384,6 @@ }
         var serializedString = value.substring(TYPE_SERIALIZED_MARKER_LENGTH);
-        var type = value.substring(SERIALIZED_MARKER_LENGTH,
-                                   TYPE_SERIALIZED_MARKER_LENGTH);
+        var type = value.substring(
+            SERIALIZED_MARKER_LENGTH,
+            TYPE_SERIALIZED_MARKER_LENGTH
+        );
 
@@ -413,7 +448,10 @@ // Fill the string into a ArrayBuffer.
         if (callback) {
-            promise.then(function(result) {
-                callback(null, result);
-            }, function(error) {
-                callback(error);
-            });
+            promise.then(
+                function(result) {
+                    callback(null, result);
+                },
+                function(error) {
+                    callback(error);
+                }
+            );
         }
@@ -440,3 +478,7 @@ }
         });
-    } else if (typeof module !== 'undefined' && module.exports && typeof require !== 'undefined') {
+    } else if (
+        typeof module !== 'undefined' &&
+        module.exports &&
+        typeof require !== 'undefined'
+    ) {
         module.exports = dummyStorageDriver;
@@ -446,2 +488,2 @@ } else {
     }
-}).call(window);
+}.call(window));

test/runner.js

@@ -42,3 +42,3 @@ /* global requirejs:true */
     Array.prototype.forEach = function(callback, thisArg) {
-        if (typeof(callback) !== 'function') {
+        if (typeof callback !== 'function') {
             throw new TypeError(callback + ' is not a function!');
@@ -55,3 +55,2 @@ }
 if (require) {
-
     requirejs.config({
@@ -58,0 +57,0 @@ paths: {

test/saucelabs-browsers.js

@@ -1,2 +0,2 @@
-/*jshint node:true */ 
+/*jshint node:true */
 
@@ -8,3 +8,3 @@ var SAUCELAB_BROWSERS = [
         platform: 'Windows 7',
-        version: '34',
+        version: '34'
     },
@@ -15,3 +15,3 @@ {
         platform: 'Windows 7',
-        version: '28',
+        version: '28'
     },
@@ -22,3 +22,3 @@ {
         platform: 'Windows 7',
-        version: '29',
+        version: '29'
     },
@@ -35,3 +35,3 @@
         browserName: 'internet explorer',
-        version: '9',
+        version: '9'
     },
@@ -41,3 +41,3 @@ {
         browserName: 'internet explorer',
-        version: '10',
+        version: '10'
     },
@@ -47,6 +47,5 @@ {
         browserName: 'internet explorer',
-        version: '11',
+        version: '11'
     },
 
-    
     {
@@ -63,5 +62,5 @@ base: 'SauceLabs',
         platform: 'Windows 8.1'
-    },
+    }
 ];
 
 module.exports = SAUCELAB_BROWSERS;

test/serviceworker-client.js

 /*globals importScripts:true, self:true */
-importScripts("/dist/localforage.js");
+importScripts('/dist/localforage.js');
 
@@ -8,3 +8,6 @@ self.onmessage = function(messageEvent) {
         .then(function() {
-            return localforage.setItem('service worker', messageEvent.data.value);
+            return localforage.setItem(
+                'service worker',
+                messageEvent.data.value
+            );
         })
@@ -15,17 +18,12 @@ .then(function() {
         .then(function(value) {
-            messageEvent
-                .ports[0]
-                .postMessage({
-                    body: value + ' using ' + localforage.driver()
-                });
-
+            messageEvent.ports[0].postMessage({
+                body: value + ' using ' + localforage.driver()
+            });
         })
         .catch(function(error) {
-            messageEvent
-                .ports[0]
-                .postMessage({
-                    error: JSON.stringify(error),
-                    body: error,
-                    fail: true
-                });
+            messageEvent.ports[0].postMessage({
+                error: JSON.stringify(error),
+                body: error,
+                fail: true
+            });
         });
@@ -37,7 +35,7 @@ };
         localforage
-        .setItem('service worker registration', 'serviceworker present')
-        .then(function(value) {
-            console.log(value);
-        })
+            .setItem('service worker registration', 'serviceworker present')
+            .then(function(value) {
+                console.log(value);
+            })
     );
 };

test/test.callwhenready.js

@@ -28,8 +28,11 @@ /* global beforeEach:true */
 
-    localforage.ready().then(function() {
-        previousDriver = localforage.driver();
-        rerequirelocalforage();
-    }, function() {
-        rerequirelocalforage();
-    });
+    localforage.ready().then(
+        function() {
+            previousDriver = localforage.driver();
+            rerequirelocalforage();
+        },
+        function() {
+            rerequirelocalforage();
+        }
+    );
 });

test/test.config.js

@@ -52,4 +52,5 @@ /* global before:true, beforeEach:true, describe:true, expect:true, it:true */
 
-            var error = "Error: Can't call config() after localforage " +
-                        'has been used.';
+            var error =
+                "Error: Can't call config() after localforage " +
+                'has been used.';
 
@@ -63,4 +64,5 @@ expect(configResult).to.not.be(true);
             expect(localforage.config('driver')).to.be(localforage.driver());
-            expect(localforage.config('driver')).to.not
-                              .be('I a not set driver');
+            expect(localforage.config('driver')).to.not.be(
+                'I a not set driver'
+            );
             expect(localforage.config('name')).to.be('localforage');
@@ -77,3 +79,4 @@ expect(localforage.config('name')).to.not.be('My Cool App');
     it('sets new values and returns them properly', function(done) {
-        var secondSupportedDriver = supportedDrivers.length >= 2 ? supportedDrivers[1] : null;
+        var secondSupportedDriver =
+            supportedDrivers.length >= 2 ? supportedDrivers[1] : null;
 
@@ -89,6 +92,6 @@ localforage.config({
         expect(localforage.config('description')).to.not.be('');
-        expect(localforage.config('description')).to
-                          .be('The offline datastore for my cool app');
-        expect(localforage.config('driver')).to
-                          .be(secondSupportedDriver);
+        expect(localforage.config('description')).to.be(
+            'The offline datastore for my cool app'
+        );
+        expect(localforage.config('driver')).to.be(secondSupportedDriver);
         expect(localforage.config('name')).to.be('My Cool App');
@@ -101,7 +104,7 @@ expect(localforage.config('size')).to.be(4980736);
             if (supportedDrivers.length >= 2) {
-                expect(localforage.config('driver')).to
-                                  .be(secondSupportedDriver);
+                expect(localforage.config('driver')).to.be(
+                    secondSupportedDriver
+                );
             } else {
-                expect(localforage.config('driver')).to
-                                  .be(supportedDrivers[0]);
+                expect(localforage.config('driver')).to.be(supportedDrivers[0]);
             }
@@ -121,9 +124,12 @@ done();
             expect(configResult).to.be.a(Promise);
-            localforage.ready(function() {
-                expect(localforage.config('driver')).to
-                                  .be(otherSupportedDrivers[0]);
-                return configResult;
-            }).then(function() {
-                done();
-            });
+            localforage
+                .ready(function() {
+                    expect(localforage.config('driver')).to.be(
+                        otherSupportedDrivers[0]
+                    );
+                    return configResult;
+                })
+                .then(function() {
+                    done();
+                });
         });
@@ -139,12 +145,14 @@ }
         expect(configResult).to.be.a(Promise);
-        localforage.ready(function() {
-            expect(localforage.config('driver')).to
-                              .be(oldDriver);
-            return configResult;
-        }).catch(function(error) {
-            expect(error).to.be.an(Error);
-            expect(error.message).to
-                .be('No available storage method found.');
-            done();
-        });
+        localforage
+            .ready(function() {
+                expect(localforage.config('driver')).to.be(oldDriver);
+                return configResult;
+            })
+            .catch(function(error) {
+                expect(error).to.be.an(Error);
+                expect(error.message).to.be(
+                    'No available storage method found.'
+                );
+                done();
+            });
     });
@@ -162,4 +170,3 @@
         localforage.ready(function() {
-            expect(localforage.config('driver')).to
-                              .be(oldDriver);
+            expect(localforage.config('driver')).to.be(oldDriver);
             done();
@@ -193,6 +200,9 @@ });
             if (localforage.driver() === localforage.INDEXEDDB) {
-                var indexedDB = (indexedDB || window.indexedDB ||
-                                 window.webkitIndexedDB ||
-                                 window.mozIndexedDB || window.OIndexedDB ||
-                                 window.msIndexedDB);
+                var indexedDB =
+                    indexedDB ||
+                    window.indexedDB ||
+                    window.webkitIndexedDB ||
+                    window.mozIndexedDB ||
+                    window.OIndexedDB ||
+                    window.msIndexedDB;
                 var req = indexedDB.open('My Cool App', 2.0);
@@ -202,5 +212,5 @@
                     var dbValue = req.result
-                                     .transaction('myStoreName', 'readonly')
-                                     .objectStore('myStoreName')
-                                     .get('some key');
+                        .transaction('myStoreName', 'readonly')
+                        .objectStore('myStoreName')
+                        .get('some key');
                     expect(dbValue).to.be(value);
@@ -210,15 +220,23 @@ done();
             } else if (localforage.driver() === localforage.WEBSQL) {
-                window.openDatabase('My Cool App', String(2.0), '',
-                                    4980736).transaction(function(t) {
-                    t.executeSql('SELECT * FROM myStoreName WHERE key = ? ' +
-                                 'LIMIT 1', ['some key'], function(t, results) {
-                        var dbValue = JSON.parse(results.rows.item(0).value);
+                window
+                    .openDatabase('My Cool App', String(2.0), '', 4980736)
+                    .transaction(function(t) {
+                        t.executeSql(
+                            'SELECT * FROM myStoreName WHERE key = ? ' +
+                                'LIMIT 1',
+                            ['some key'],
+                            function(t, results) {
+                                var dbValue = JSON.parse(
+                                    results.rows.item(0).value
+                                );
 
-                        expect(dbValue).to.be(value);
-                        done();
+                                expect(dbValue).to.be(value);
+                                done();
+                            }
+                        );
                     });
-                });
             } else if (localforage.driver() === localforage.LOCALSTORAGE) {
                 var dbValue = JSON.parse(
-                    localStorage['My Cool App/myStoreName/some key']);
+                    localStorage['My Cool App/myStoreName/some key']
+                );
 
@@ -243,8 +261,11 @@ expect(dbValue).to.be(value);
 
-        localforage.length().then(function() {
-            return localforage.setDriver(localforage.LOCALSTORAGE);
-        }).then(function() {
-            expect(localforage.config('name')).to.be('Mega Mozilla Dino');
-            done();
-        });
+        localforage
+            .length()
+            .then(function() {
+                return localforage.setDriver(localforage.LOCALSTORAGE);
+            })
+            .then(function() {
+                expect(localforage.config('name')).to.be('Mega Mozilla Dino');
+                done();
+            });
     });
@@ -251,0 +272,0 @@

test/test.customdriver.js

 /* global describe:true, expect:true, it:true, dummyStorageDriver:true */
 describe('When Custom Drivers are used', function() {
     'use strict';
-    var errorMessage = 'Custom driver not compliant; see ' +
-                       'https://mozilla.github.io/localForage/#definedriver';
+    var errorMessage =
+        'Custom driver not compliant; see ' +
+        'https://mozilla.github.io/localForage/#definedriver';
 
     it('fails to define a no-name custom driver', function(done) {
-        localforage.defineDriver({
-            _initStorage: function() {},
-            iterate: function() {},
-            getItem: function() {},
-            setItem: function() {},
-            removeItem: function() {},
-            clear: function() {},
-            length: function() {},
-            key: function() {},
-            keys: function() {}
-        }, null,  function(err) {
-            expect(err).to.be.an(Error);
-            expect(err.message).to.be(errorMessage);
-            done();
-        });
+        localforage.defineDriver(
+            {
+                _initStorage: function() {},
+                iterate: function() {},
+                getItem: function() {},
+                setItem: function() {},
+                removeItem: function() {},
+                clear: function() {},
+                length: function() {},
+                key: function() {},
+                keys: function() {}
+            },
+            null,
+            function(err) {
+                expect(err).to.be.an(Error);
+                expect(err.message).to.be(errorMessage);
+                done();
+            }
+        );
     });
 
     it('fails to define a no-name custom driver [promise]', function(done) {
-        localforage.defineDriver({
-            _initStorage: function() {},
-            iterate: function() {},
-            getItem: function() {},
-            setItem: function() {},
-            removeItem: function() {},
-            clear: function() {},
-            length: function() {},
-            key: function() {},
-            keys: function() {}
-        }).then(null, function(err) {
-            expect(err).to.be.an(Error);
-            expect(err.message).to.be(errorMessage);
-            done();
-        });
+        localforage
+            .defineDriver({
+                _initStorage: function() {},
+                iterate: function() {},
+                getItem: function() {},
+                setItem: function() {},
+                removeItem: function() {},
+                clear: function() {},
+                length: function() {},
+                key: function() {},
+                keys: function() {}
+            })
+            .then(null, function(err) {
+                expect(err).to.be.an(Error);
+                expect(err.message).to.be(errorMessage);
+                done();
+            });
     });
 
     it('fails to define a custom driver with missing methods', function(done) {
-        localforage.defineDriver({
-            _driver: 'missingMethodsDriver',
-            _initStorage: function() {},
-            iterate: function() {},
-            getItem: function() {},
-            setItem: function() {},
-            removeItem: function() {},
-            clear: function() {}
-        }, null,  function(err) {
-            expect(err).to.be.an(Error);
-            expect(err.message).to.be(errorMessage);
-            done();
-        });
+        localforage.defineDriver(
+            {
+                _driver: 'missingMethodsDriver',
+                _initStorage: function() {},
+                iterate: function() {},
+                getItem: function() {},
+                setItem: function() {},
+                removeItem: function() {},
+                clear: function() {}
+            },
+            null,
+            function(err) {
+                expect(err).to.be.an(Error);
+                expect(err.message).to.be(errorMessage);
+                done();
+            }
+        );
     });
 
     it('fails to define a custom driver with missing methods [promise]', function(done) {
-        localforage.defineDriver({
-            _driver: 'missingMethodsDriver',
-            _initStorage: function() {},
-            iterate: function() {},
-            getItem: function() {},
-            setItem: function() {},
-            removeItem: function() {},
-            clear: function() {}
-        }).then(null, function(err) {
-            expect(err).to.be.an(Error);
-            expect(err.message).to.be(errorMessage);
-            done();
-        });
+        localforage
+            .defineDriver({
+                _driver: 'missingMethodsDriver',
+                _initStorage: function() {},
+                iterate: function() {},
+                getItem: function() {},
+                setItem: function() {},
+                removeItem: function() {},
+                clear: function() {}
+            })
+            .then(null, function(err) {
+                expect(err).to.be.an(Error);
+                expect(err.message).to.be(errorMessage);
+                done();
+            });
     });
@@ -97,23 +110,26 @@
     it('sets a custom driver [promise]', function(done) {
-        localforage.defineDriver(dummyStorageDriver).then(function() {
-            return localforage.setDriver(dummyStorageDriver._driver);
-        }).then(function() {
-            expect(localforage.driver()).to.be(dummyStorageDriver._driver);
-            done();
-        });
+        localforage
+            .defineDriver(dummyStorageDriver)
+            .then(function() {
+                return localforage.setDriver(dummyStorageDriver._driver);
+            })
+            .then(function() {
+                expect(localforage.driver()).to.be(dummyStorageDriver._driver);
+                done();
+            });
     });
 
-    it('defines a driver synchronously when it doesn\'t have _supports()', function(done) {
+    it("defines a driver synchronously when it doesn't have _supports()", function(done) {
         var customDriver = {
-            _driver: 'dummyStorageDriver' + (+new Date()),
-            _initStorage: function() { },
+            _driver: 'dummyStorageDriver' + +new Date(),
+            _initStorage: function() {},
             // _support: function() { return true; }
-            iterate: function() { },
-            getItem: function() { },
-            setItem: function() { },
-            removeItem: function() { },
-            clear: function() { },
-            length: function() { },
-            key: function() { },
-            keys: function() { }
+            iterate: function() {},
+            getItem: function() {},
+            setItem: function() {},
+            removeItem: function() {},
+            clear: function() {},
+            length: function() {},
+            key: function() {},
+            keys: function() {}
         };
@@ -130,13 +146,13 @@
         var customDriver = {
-            _driver: 'dummyStorageDriver' + (+new Date()),
-            _initStorage: function() { },
+            _driver: 'dummyStorageDriver' + +new Date(),
+            _initStorage: function() {},
             _support: true,
-            iterate: function() { },
-            getItem: function() { },
-            setItem: function() { },
-            removeItem: function() { },
-            clear: function() { },
-            length: function() { },
-            key: function() { },
-            keys: function() { }
+            iterate: function() {},
+            getItem: function() {},
+            setItem: function() {},
+            removeItem: function() {},
+            clear: function() {},
+            length: function() {},
+            key: function() {},
+            keys: function() {}
         };
@@ -153,23 +169,26 @@
         var customDriver = {
-            _driver: 'dummyStorageDriver' + (+new Date()),
-            _initStorage: function() { },
+            _driver: 'dummyStorageDriver' + +new Date(),
+            _initStorage: function() {},
             _support: function() {
                 return Promise.resolve(true);
             },
-            iterate: function() { },
-            getItem: function() { },
-            setItem: function() { },
-            removeItem: function() { },
-            clear: function() { },
-            length: function() { },
-            key: function() { },
-            keys: function() { }
+            iterate: function() {},
+            getItem: function() {},
+            setItem: function() {},
+            removeItem: function() {},
+            clear: function() {},
+            length: function() {},
+            key: function() {},
+            keys: function() {}
         };
 
-        localforage.defineDriver(customDriver).then(function() {
-            return localforage.setDriver(customDriver._driver);
-        }).then(function() {
-            expect(localforage.driver()).to.be(customDriver._driver);
-            done();
-        });
+        localforage
+            .defineDriver(customDriver)
+            .then(function() {
+                return localforage.setDriver(customDriver._driver);
+            })
+            .then(function() {
+                expect(localforage.driver()).to.be(customDriver._driver);
+                done();
+            });
     });
@@ -181,10 +200,17 @@
                 expect(err).to.be(undefined);
-                localforage.setItem('testCallbackKey', 'testCallbackValue', function(err) {
-                    expect(err).to.be(null);
-                    localforage.getItem('testCallbackKey', function(err, value) {
+                localforage.setItem(
+                    'testCallbackKey',
+                    'testCallbackValue',
+                    function(err) {
                         expect(err).to.be(null);
-                        expect(value).to.be('testCallbackValue');
-                        done();
-                    });
-                });
+                        localforage.getItem('testCallbackKey', function(
+                            err,
+                            value
+                        ) {
+                            expect(err).to.be(null);
+                            expect(value).to.be('testCallbackValue');
+                            done();
+                        });
+                    }
+                );
             });
@@ -195,14 +221,89 @@ });
     it('sets and uses a custom driver [promise]', function(done) {
-        localforage.defineDriver(dummyStorageDriver).then(function() {
-            return localforage.setDriver(dummyStorageDriver._driver);
-        }).then(function() {
-            return localforage.setItem('testPromiseKey', 'testPromiseValue');
-        }).then(function() {
-            return localforage.getItem('testPromiseKey');
-        }).then(function(value) {
-            expect(value).to.be('testPromiseValue');
-            done();
+        localforage
+            .defineDriver(dummyStorageDriver)
+            .then(function() {
+                return localforage.setDriver(dummyStorageDriver._driver);
+            })
+            .then(function() {
+                return localforage.setItem(
+                    'testPromiseKey',
+                    'testPromiseValue'
+                );
+            })
+            .then(function() {
+                return localforage.getItem('testPromiseKey');
+            })
+            .then(function(value) {
+                expect(value).to.be('testPromiseValue');
+                done();
+            });
+    });
+
+    describe('when dropInstance is not defined', function() {
+        it('rejects when it is used', function(done) {
+            var customDriver = {
+                _driver: 'dummyStorageDriver' + +new Date(),
+                _initStorage: function() {},
+                _support: function() {
+                    return Promise.resolve(true);
+                },
+                iterate: function() {},
+                getItem: function() {},
+                setItem: function() {},
+                removeItem: function() {},
+                clear: function() {},
+                length: function() {},
+                key: function() {},
+                keys: function() {}
+            };
+
+            localforage
+                .defineDriver(customDriver)
+                .then(function() {
+                    return localforage.setDriver(customDriver._driver);
+                })
+                .then(function() {
+                    return localforage.dropInstance();
+                })
+                .catch(function(err) {
+                    expect(err.message).to.be(
+                        'Method dropInstance is not implemented by the current driver'
+                    );
+                    done();
+                });
         });
     });
 
+    describe('when dropInstance is defined', function() {
+        it('is does not reject', function(done) {
+            var customDriver = {
+                _driver: 'dummyStorageDriver' + +new Date(),
+                _initStorage: function() {},
+                _support: function() {
+                    return Promise.resolve(true);
+                },
+                iterate: function() {},
+                getItem: function() {},
+                setItem: function() {},
+                removeItem: function() {},
+                clear: function() {},
+                length: function() {},
+                key: function() {},
+                keys: function() {},
+                dropInstance: function() {}
+            };
+
+            localforage
+                .defineDriver(customDriver)
+                .then(function() {
+                    return localforage.setDriver(customDriver._driver);
+                })
+                .then(function() {
+                    return localforage.dropInstance();
+                })
+                .then(function() {
+                    done();
+                });
+        });
+    });
 });

test/test.datatypes.js

@@ -14,6 +14,10 @@ /* global before:true, beforeEach:true, describe:true, expect:true, it:true */
         }
-        var Builder = typeof BlobBuilder !== 'undefined' ? BlobBuilder :
-            typeof MSBlobBuilder !== 'undefined' ? MSBlobBuilder :
-            typeof MozBlobBuilder !== 'undefined' ? MozBlobBuilder :
-            WebKitBlobBuilder;
+        var Builder =
+            typeof BlobBuilder !== 'undefined'
+                ? BlobBuilder
+                : typeof MSBlobBuilder !== 'undefined'
+                  ? MSBlobBuilder
+                  : typeof MozBlobBuilder !== 'undefined'
+                    ? MozBlobBuilder
+                    : WebKitBlobBuilder;
         var builder = new Builder();
@@ -34,8 +38,10 @@ for (var i = 0; i < parts.length; i += 1) {
 DRIVERS.forEach(function(driverName) {
-    if ((!localforage.supports(localforage.INDEXEDDB) &&
-         driverName === localforage.INDEXEDDB) ||
+    if (
+        (!localforage.supports(localforage.INDEXEDDB) &&
+            driverName === localforage.INDEXEDDB) ||
         (!localforage.supports(localforage.LOCALSTORAGE) &&
-         driverName === localforage.LOCALSTORAGE) ||
+            driverName === localforage.LOCALSTORAGE) ||
         (!localforage.supports(localforage.WEBSQL) &&
-         driverName === localforage.WEBSQL)) {
+            driverName === localforage.WEBSQL)
+    ) {
         // Browser doesn't support this storage library, so we exit the API
@@ -70,21 +76,27 @@ // tests.
         it('saves a string [promise]', function(done) {
-            localforage.setItem('office', 'Initech').then(function(setValue) {
-                expect(setValue).to.be('Initech');
+            localforage
+                .setItem('office', 'Initech')
+                .then(function(setValue) {
+                    expect(setValue).to.be('Initech');
 
-                return localforage.getItem('office');
-            }).then(function(value) {
-                expect(value).to.be('Initech');
-                done();
-            });
+                    return localforage.getItem('office');
+                })
+                .then(function(value) {
+                    expect(value).to.be('Initech');
+                    done();
+                });
         });
 
         it('saves a string like "[object Blob]" [promise]', function(done) {
-            localforage.setItem('fake Blob', '[object Blob]').then(function(setValue) {
-                expect(setValue).to.be('[object Blob]');
+            localforage
+                .setItem('fake Blob', '[object Blob]')
+                .then(function(setValue) {
+                    expect(setValue).to.be('[object Blob]');
 
-                return localforage.getItem('fake Blob');
-            }).then(function(value) {
-                expect(value).to.be('[object Blob]');
-                done();
-            });
+                    return localforage.getItem('fake Blob');
+                })
+                .then(function(value) {
+                    expect(value).to.be('[object Blob]');
+                    done();
+                });
         });
@@ -105,12 +117,15 @@
         it('saves a number [promise]', function(done) {
-            localforage.setItem('number', 546).then(function(setValue) {
-                expect(setValue).to.be(546);
-                expect(setValue).to.be.a('number');
+            localforage
+                .setItem('number', 546)
+                .then(function(setValue) {
+                    expect(setValue).to.be(546);
+                    expect(setValue).to.be.a('number');
 
-                return localforage.getItem('number');
-            }).then(function(value) {
-                expect(value).to.be(546);
-                expect(value).to.be.a('number');
-                done();
-            });
+                    return localforage.getItem('number');
+                })
+                .then(function(value) {
+                    expect(value).to.be(546);
+                    expect(value).to.be.a('number');
+                    done();
+                });
         });
@@ -131,12 +146,15 @@
         it('saves a boolean [promise]', function(done) {
-            localforage.setItem('boolean', false).then(function(setValue) {
-                expect(setValue).to.be(false);
-                expect(setValue).to.be.a('boolean');
+            localforage
+                .setItem('boolean', false)
+                .then(function(setValue) {
+                    expect(setValue).to.be(false);
+                    expect(setValue).to.be.a('boolean');
 
-                return localforage.getItem('boolean');
-            }).then(function(value) {
-                expect(value).to.be(false);
-                expect(value).to.be.a('boolean');
-                done();
-            });
+                    return localforage.getItem('boolean');
+                })
+                .then(function(value) {
+                    expect(value).to.be(false);
+                    expect(value).to.be.a('boolean');
+                    done();
+                });
         });
@@ -155,10 +173,13 @@
         it('saves null [promise]', function(done) {
-            localforage.setItem('null', null).then(function(setValue) {
-                expect(setValue).to.be(null);
+            localforage
+                .setItem('null', null)
+                .then(function(setValue) {
+                    expect(setValue).to.be(null);
 
-                return localforage.getItem('null');
-            }).then(function(value) {
-                expect(value).to.be(null);
-                done();
-            });
+                    return localforage.getItem('null');
+                })
+                .then(function(value) {
+                    expect(value).to.be(null);
+                    done();
+                });
         });
@@ -177,10 +198,13 @@
         it('saves undefined as null [promise]', function(done) {
-            localforage.setItem('null', undefined).then(function(setValue) {
-                expect(setValue).to.be(null);
+            localforage
+                .setItem('null', undefined)
+                .then(function(setValue) {
+                    expect(setValue).to.be(null);
 
-                return localforage.getItem('null');
-            }).then(function(value) {
-                expect(value).to.be(null);
-                done();
-            });
+                    return localforage.getItem('null');
+                })
+                .then(function(value) {
+                    expect(value).to.be(null);
+                    done();
+                });
         });
@@ -201,12 +225,15 @@
         it('saves a float [promise]', function(done) {
-            localforage.setItem('float', 546.041).then(function(setValue) {
-                expect(setValue).to.be(546.041);
-                expect(setValue).to.be.a('number');
+            localforage
+                .setItem('float', 546.041)
+                .then(function(setValue) {
+                    expect(setValue).to.be(546.041);
+                    expect(setValue).to.be.a('number');
 
-                return localforage.getItem('float');
-            }).then(function(value) {
-                expect(value).to.be(546.041);
-                expect(value).to.be.a('number');
-                done();
-            });
+                    return localforage.getItem('float');
+                })
+                .then(function(value) {
+                    expect(value).to.be(546.041);
+                    expect(value).to.be.a('number');
+                    done();
+                });
         });
@@ -229,13 +256,16 @@
         it('saves an array [promise]', function(done) {
-            localforage.setItem('array', arrayToSave).then(function(setValue) {
-                expect(setValue.length).to.be(arrayToSave.length);
-                expect(setValue instanceof Array).to.be(true);
+            localforage
+                .setItem('array', arrayToSave)
+                .then(function(setValue) {
+                    expect(setValue.length).to.be(arrayToSave.length);
+                    expect(setValue instanceof Array).to.be(true);
 
-                return localforage.getItem('array');
-            }).then(function(value) {
-                expect(value.length).to.be(arrayToSave.length);
-                expect(value instanceof Array).to.be(true);
-                expect(value[1]).to.be.a('string');
-                done();
-            });
+                    return localforage.getItem('array');
+                })
+                .then(function(value) {
+                    expect(value.length).to.be(arrayToSave.length);
+                    expect(value instanceof Array).to.be(true);
+                    expect(value[1]).to.be.a('string');
+                    done();
+                });
         });
@@ -249,5 +279,5 @@
             nestedObjects: [
-                {truth: true},
-                {theCake: 'is a lie'},
-                {happiness: 'is a warm gun'},
+                { truth: true },
+                { theCake: 'is a lie' },
+                { happiness: 'is a warm gun' },
                 false
@@ -259,9 +289,11 @@ ],
             localforage.setItem('obj', objectToSave, function(err, setValue) {
-                expect(Object.keys(setValue).length)
-                    .to.be(Object.keys(objectToSave).length);
+                expect(Object.keys(setValue).length).to.be(
+                    Object.keys(objectToSave).length
+                );
                 expect(setValue).to.be.an('object');
 
                 localforage.getItem('obj', function(err, value) {
-                    expect(Object.keys(value).length)
-                        .to.be(Object.keys(objectToSave).length);
+                    expect(Object.keys(value).length).to.be(
+                        Object.keys(objectToSave).length
+                    );
                     expect(value).to.be.an('object');
@@ -277,18 +309,23 @@ expect(value.nested).to.be.an('object');
         it('saves a nested object [promise]', function(done) {
-            localforage.setItem('obj', objectToSave).then(function(setValue) {
-                expect(Object.keys(setValue).length)
-                    .to.be(Object.keys(objectToSave).length);
-                expect(setValue).to.be.an('object');
+            localforage
+                .setItem('obj', objectToSave)
+                .then(function(setValue) {
+                    expect(Object.keys(setValue).length).to.be(
+                        Object.keys(objectToSave).length
+                    );
+                    expect(setValue).to.be.an('object');
 
-                return localforage.getItem('obj');
-            }).then(function(value) {
-                expect(Object.keys(value).length)
-                    .to.be(Object.keys(objectToSave).length);
-                expect(value).to.be.an('object');
-                expect(value.nested).to.be.an('object');
-                expect(value.nestedObjects[0].truth).to.be.a('boolean');
-                expect(value.nestedObjects[1].theCake).to.be.a('string');
-                expect(value.nestedObjects[3]).to.be(false);
-                done();
-            });
+                    return localforage.getItem('obj');
+                })
+                .then(function(value) {
+                    expect(Object.keys(value).length).to.be(
+                        Object.keys(objectToSave).length
+                    );
+                    expect(value).to.be.an('object');
+                    expect(value.nested).to.be.an('object');
+                    expect(value.nestedObjects[0].truth).to.be.a('boolean');
+                    expect(value.nestedObjects[1].theCake).to.be.a('string');
+                    expect(value.nestedObjects[3]).to.be(false);
+                    done();
+                });
         });
@@ -308,19 +345,28 @@
                         var response = request.response;
-                        localforage.setItem('ab', response, function(err, sab) {
-                            expect(sab.toString())
-                                .to.be('[object ArrayBuffer]');
-                            expect(sab.byteLength)
-                                .to.be(response.byteLength);
-                        }).then(function() {
-                            // TODO: Running getItem from inside the setItem
-                            // callback times out on IE 10/11. Could be an
-                            // open transaction issue?
-                            localforage.getItem('ab', function(err, arrayBuff) {
-                                expect(arrayBuff.toString())
-                                    .to.be('[object ArrayBuffer]');
-                                expect(arrayBuff.byteLength)
-                                    .to.be(response.byteLength);
+                        localforage
+                            .setItem('ab', response, function(err, sab) {
+                                expect(sab.toString()).to.be(
+                                    '[object ArrayBuffer]'
+                                );
+                                expect(sab.byteLength).to.be(
+                                    response.byteLength
+                                );
+                            })
+                            .then(function() {
+                                // TODO: Running getItem from inside the setItem
+                                // callback times out on IE 10/11. Could be an
+                                // open transaction issue?
+                                localforage.getItem('ab', function(
+                                    err,
+                                    arrayBuff
+                                ) {
+                                    expect(arrayBuff.toString()).to.be(
+                                        '[object ArrayBuffer]'
+                                    );
+                                    expect(arrayBuff.byteLength).to.be(
+                                        response.byteLength
+                                    );
+                                });
+                                done();
                             });
-                            done();
-                        });
                     }
@@ -340,3 +386,5 @@ };
         } else {
-            it.skip('saves binary (ArrayBuffer) data (ArrayBuffer type does not exist)');
+            it.skip(
+                'saves binary (ArrayBuffer) data (ArrayBuffer type does not exist)'
+            );
         }
@@ -352,24 +400,20 @@
 
-                var testBlob = createBlob(fileParts, { 'type' : mimeString });
+                var testBlob = createBlob(fileParts, { type: mimeString });
 
-                localforage.setItem('blob', testBlob, function(err, blob) {
-                    expect(err).to.be(null);
-                    expect(blob.toString())
-                        .to.be('[object Blob]');
-                    expect(blob.size)
-                        .to.be(testBlob.size);
-                    expect(blob.type)
-                        .to.be(testBlob.type);
-                }).then(function() {
-                    localforage.getItem('blob', function(err, blob) {
+                localforage
+                    .setItem('blob', testBlob, function(err, blob) {
                         expect(err).to.be(null);
-                        expect(blob.toString())
-                            .to.be('[object Blob]');
-                        expect(blob.size)
-                            .to.be(testBlob.size);
-                        expect(blob.type)
-                            .to.be(testBlob.type);
-                        done();
+                        expect(blob.toString()).to.be('[object Blob]');
+                        expect(blob.size).to.be(testBlob.size);
+                        expect(blob.type).to.be(testBlob.type);
+                    })
+                    .then(function() {
+                        localforage.getItem('blob', function(err, blob) {
+                            expect(err).to.be(null);
+                            expect(blob.toString()).to.be('[object Blob]');
+                            expect(blob.size).to.be(testBlob.size);
+                            expect(blob.type).to.be(testBlob.type);
+                            done();
+                        });
                     });
-                });
             });
@@ -385,26 +429,22 @@ } else {
 
-                var testBlob = createBlob(fileParts, { 'type' : mimeString });
+                var testBlob = createBlob(fileParts, { type: mimeString });
 
-                localforage.setItem('blob', testBlob, function(err, blob) {
-                    expect(err).to.be(null);
-                    expect(blob.toString())
-                        .to.be('[object Blob]');
-                    expect(blob.size)
-                        .to.be(testBlob.size);
-                    expect(blob.type)
-                        .to.be(testBlob.type);
-                }).then(function() {
-                    localforage.iterate(function(blob, key) {
-                        if (key !== 'blob') {
-                            return;
-                        }
-                        expect(blob.toString())
-                            .to.be('[object Blob]');
-                        expect(blob.size)
-                            .to.be(testBlob.size);
-                        expect(blob.type)
-                            .to.be(testBlob.type);
-                        done();
+                localforage
+                    .setItem('blob', testBlob, function(err, blob) {
+                        expect(err).to.be(null);
+                        expect(blob.toString()).to.be('[object Blob]');
+                        expect(blob.size).to.be(testBlob.size);
+                        expect(blob.type).to.be(testBlob.type);
+                    })
+                    .then(function() {
+                        localforage.iterate(function(blob, key) {
+                            if (key !== 'blob') {
+                                return;
+                            }
+                            expect(blob.toString()).to.be('[object Blob]');
+                            expect(blob.size).to.be(testBlob.size);
+                            expect(blob.type).to.be(testBlob.type);
+                            done();
+                        });
                     });
-                });
             });
@@ -468,4 +508,5 @@ } else {
                     localforage.getItem('array', function(err, readValue) {
-                        expect(readValue instanceof Uint8ClampedArray)
-                            .to.be(true);
+                        expect(readValue instanceof Uint8ClampedArray).to.be(
+                            true
+                        );
                         expect(readValue[0]).to.be(array[0]);
@@ -472,0 +513,0 @@ expect(readValue[1]).to.be(array[1]);

test/test.drivers.js

@@ -19,26 +19,42 @@ /* global beforeEach:true, describe:true, expect:true, it:true */
 
-    if ((localforage.supports(localforage.INDEXEDDB) &&
-         localforage.driver() === localforage.INDEXEDDB) ||
+    if (
+        (localforage.supports(localforage.INDEXEDDB) &&
+            localforage.driver() === localforage.INDEXEDDB) ||
         (localforage.supports(localforage.WEBSQL) &&
-         localforage.driver() === localforage.WEBSQL)) {
-        it('can change to localStorage from ' + localforage.driver() +
-           ' [callback]', function(done) {
-            var previousDriver = localforage.driver();
+            localforage.driver() === localforage.WEBSQL)
+    ) {
+        it(
+            'can change to localStorage from ' +
+                localforage.driver() +
+                ' [callback]',
+            function(done) {
+                var previousDriver = localforage.driver();
 
-            localforage.setDriver(localforage.LOCALSTORAGE, function() {
-                expect(localforage.driver()).to.be(localforage.LOCALSTORAGE);
-                expect(localforage.driver()).to.not.be(previousDriver);
-                done();
-            });
-        });
-        it('can change to localStorage from ' + localforage.driver() +
-           ' [promise]', function(done) {
-            var previousDriver = localforage.driver();
+                localforage.setDriver(localforage.LOCALSTORAGE, function() {
+                    expect(localforage.driver()).to.be(
+                        localforage.LOCALSTORAGE
+                    );
+                    expect(localforage.driver()).to.not.be(previousDriver);
+                    done();
+                });
+            }
+        );
+        it(
+            'can change to localStorage from ' +
+                localforage.driver() +
+                ' [promise]',
+            function(done) {
+                var previousDriver = localforage.driver();
 
-            localforage.setDriver(localforage.LOCALSTORAGE).then(function() {
-                expect(localforage.driver()).to.be(localforage.LOCALSTORAGE);
-                expect(localforage.driver()).to.not.be(previousDriver);
-                done();
-            });
-        });
+                localforage
+                    .setDriver(localforage.LOCALSTORAGE)
+                    .then(function() {
+                        expect(localforage.driver()).to.be(
+                            localforage.LOCALSTORAGE
+                        );
+                        expect(localforage.driver()).to.not.be(previousDriver);
+                        done();
+                    });
+            }
+        );
     }
@@ -64,4 +80,3 @@
             // TODO: Look into why.
-            localforage.setDriver(localforage.INDEXEDDB)
-            .then(null, function() {
+            localforage.setDriver(localforage.INDEXEDDB).then(null, function() {
                 expect(localforage.driver()).to.be(previousDriver);
@@ -106,10 +121,13 @@ done();
 
-            localforage.setDriver(localforage.LOCALSTORAGE)
-            .then(null, function() {
-                expect(localforage.driver()).to.be(previousDriver);
-                done();
-            });
+            localforage
+                .setDriver(localforage.LOCALSTORAGE)
+                .then(null, function() {
+                    expect(localforage.driver()).to.be(previousDriver);
+                    done();
+                });
         });
-    } else if (!localforage.supports(localforage.INDEXEDDB) &&
-               !localforage.supports(localforage.WEBSQL)) {
+    } else if (
+        !localforage.supports(localforage.INDEXEDDB) &&
+        !localforage.supports(localforage.WEBSQL)
+    ) {
         it('can set already active localStorage [callback]', function(done) {
@@ -149,4 +167,3 @@ var previousDriver = localforage.driver();
 
-            localforage.setDriver(localforage.WEBSQL)
-            .then(null, function() {
+            localforage.setDriver(localforage.WEBSQL).then(null, function() {
                 expect(localforage.driver()).to.be(previousDriver);
@@ -153,0 +170,0 @@ done();

test/test.faultydriver.js

@@ -10,16 +10,15 @@ /* global beforeEach:true, describe:true, expect:true, it:true */
     ]
-    .filter(localforage.supports)
-    .filter(function(driverName) {
-        // FF doesn't allow you to override `localStorage.setItem`
-        // so if the faulty driver setup didn't succeed
-        // then skip the localStorage tests
-        return !(
-            driverName === localforage.LOCALSTORAGE &&
-            localStorage.setItem.toString().indexOf('[native code]') >= 0
-        );
-    });
+        .filter(localforage.supports)
+        .filter(function(driverName) {
+            // FF doesn't allow you to override `localStorage.setItem`
+            // so if the faulty driver setup didn't succeed
+            // then skip the localStorage tests
+            return !(
+                driverName === localforage.LOCALSTORAGE &&
+                localStorage.setItem.toString().indexOf('[native code]') >= 0
+            );
+        });
 
     FAULTYDRIVERS.forEach(function(driverName) {
         describe(driverName, function() {
-
             beforeEach(function() {
@@ -31,7 +30,11 @@ if (driverName === localforage.LOCALSTORAGE) {
 
-            it('fails to setDriver ' + driverName + ' [callback]', function(done) {
+            it('fails to setDriver ' + driverName + ' [callback]', function(
+                done
+            ) {
                 localforage.setDriver(driverName, function() {
                     localforage.ready(function(err) {
                         expect(err).to.be.an(Error);
-                        expect(err.message).to.be('No available storage method found.');
+                        expect(err.message).to.be(
+                            'No available storage method found.'
+                        );
                         done();
@@ -42,14 +45,20 @@ });
 
-            it('fails to setDriver ' + driverName + ' [promise]', function(done) {
-                localforage.setDriver(driverName).then(function() {
-                    return localforage.ready();
-                }).then(null, function(err) {
-                    expect(err).to.be.an(Error);
-                    expect(err.message).to.be('No available storage method found.');
-                    done();
-                });
+            it('fails to setDriver ' + driverName + ' [promise]', function(
+                done
+            ) {
+                localforage
+                    .setDriver(driverName)
+                    .then(function() {
+                        return localforage.ready();
+                    })
+                    .then(null, function(err) {
+                        expect(err).to.be.an(Error);
+                        expect(err.message).to.be(
+                            'No available storage method found.'
+                        );
+                        done();
+                    });
             });
         });
     });
-
 });

test/test.iframes.js

@@ -10,4 +10,4 @@ /* global before:true, after:true, describe:true, expect:true, it:true */
         // TODO: Get this to be cross-origin.
-        iFrame.src = 'http://' + window.location.host +
-                     '/test/test.iframecontents.html';
+        iFrame.src =
+            'http://' + window.location.host + '/test/test.iframecontents.html';
 
@@ -24,5 +24,5 @@ window.document.body.appendChild(iFrame);
         var timer = setInterval(function() {
-            var element = window.document.getElementById('iframe')
-                                         .contentWindow.document
-                                         .getElementById('my-text');
+            var element = window.document
+                .getElementById('iframe')
+                .contentWindow.document.getElementById('my-text');
             if (element && element.innerHTML) {
@@ -29,0 +29,0 @@ clearInterval(timer);

test/test.nodriver.js

@@ -13,13 +13,15 @@ /* global describe:true, expect:true, it:true, Modernizr:true */
         expect(localforage.supports(localforage.INDEXEDDB)).to.be(false);
-        expect(localforage.supports(localforage.INDEXEDDB))
-            .to.be(Modernizr.indexeddb);
+        expect(localforage.supports(localforage.INDEXEDDB)).to.be(
+            Modernizr.indexeddb
+        );
 
-        expect(localforage.supports(localforage.LOCALSTORAGE))
-            .to.be(false);
-        expect(localforage.supports(localforage.LOCALSTORAGE))
-            .to.be(Modernizr.localstorage);
+        expect(localforage.supports(localforage.LOCALSTORAGE)).to.be(false);
+        expect(localforage.supports(localforage.LOCALSTORAGE)).to.be(
+            Modernizr.localstorage
+        );
 
         expect(localforage.supports(localforage.WEBSQL)).to.be(false);
-        expect(localforage.supports(localforage.WEBSQL))
-            .to.be(Modernizr.websqldatabase);
+        expect(localforage.supports(localforage.WEBSQL)).to.be(
+            Modernizr.websqldatabase
+        );
     });
@@ -83,3 +85,2 @@
     });
-
 });

test/test.serviceworkers.js

@@ -9,5 +9,7 @@ /* global navigator:true, window:true, Modernizr:true, describe:true, expect:true, it:true, xit:true, before:true, beforeEach:true, after:true*/
 DRIVERS.forEach(function(driverName) {
-    if ((!Modernizr.indexeddb && driverName === localforage.INDEXEDDB) ||
+    if (
+        (!Modernizr.indexeddb && driverName === localforage.INDEXEDDB) ||
         (!Modernizr.localstorage && driverName === localforage.LOCALSTORAGE) ||
-        (!Modernizr.websqldatabase && driverName === localforage.WEBSQL)) {
+        (!Modernizr.websqldatabase && driverName === localforage.WEBSQL)
+    ) {
         // Browser doesn't support this storage library, so we exit the API
@@ -69,4 +71,6 @@ // tests.
 
-        if (driverName === localforage.LOCALSTORAGE ||
-            driverName === localforage.WEBSQL) {
+        if (
+            driverName === localforage.LOCALSTORAGE ||
+            driverName === localforage.WEBSQL
+        ) {
             it.skip(driverName + ' is not supported in service workers');
@@ -82,4 +86,3 @@ return;
                 .then(function(result) {
-                    expect(result)
-                        .to.equal('serviceworker present');
+                    expect(result).to.equal('serviceworker present');
                     done();
@@ -95,4 +98,5 @@ })
             messageChannel.port1.onmessage = function(event) {
-                expect(event.data.body)
-                    .to.be('I have been set using ' + driverName);
+                expect(event.data.body).to.be(
+                    'I have been set using ' + driverName
+                );
                 done();
@@ -103,6 +107,9 @@ };
                 .then(function(registration) {
-                    registration.active.postMessage({
-                        driver: driverName,
-                        value: 'I have been set'
-                    }, [messageChannel.port2]);
+                    registration.active.postMessage(
+                        {
+                            driver: driverName,
+                            value: 'I have been set'
+                        },
+                        [messageChannel.port2]
+                    );
                 })
@@ -109,0 +116,0 @@ .catch(function(error) {

test/test.webworkers.js

@@ -9,8 +9,10 @@ /* global before:true, beforeEach:true, describe:true, expect:true, it:true, Modernizr:true */
 DRIVERS.forEach(function(driverName) {
-    if ((!localforage.supports(localforage.INDEXEDDB) &&
-         driverName === localforage.INDEXEDDB) ||
+    if (
+        (!localforage.supports(localforage.INDEXEDDB) &&
+            driverName === localforage.INDEXEDDB) ||
         (!localforage.supports(localforage.LOCALSTORAGE) &&
-         driverName === localforage.LOCALSTORAGE) ||
+            driverName === localforage.LOCALSTORAGE) ||
         (!localforage.supports(localforage.WEBSQL) &&
-         driverName === localforage.WEBSQL)) {
+            driverName === localforage.WEBSQL)
+    ) {
         // Browser doesn't support this storage library, so we exit the API
@@ -33,8 +35,10 @@ // tests.
         if (!Modernizr.webworkers) {
-            it.skip('doesn\'t have web worker support');
+            it.skip("doesn't have web worker support");
             return;
         }
 
-        if (driverName === localforage.LOCALSTORAGE ||
-            driverName === localforage.WEBSQL) {
+        if (
+            driverName === localforage.LOCALSTORAGE ||
+            driverName === localforage.WEBSQL
+        ) {
             it.skip(driverName + ' is not supported in web workers');
@@ -41,0 +45,0 @@ return;

test/webworker-client.js

 /*globals importScripts:true, self:true */
-importScripts("/dist/localforage.js");
+importScripts('/dist/localforage.js');
 
-self.addEventListener('message', function(e) {
-    function handleError(e) {
-        self.postMessage({
-            error: JSON.stringify(e),
-            body: e,
-            fail: true
-        });
-    }
+self.addEventListener(
+    'message',
+    function(e) {
+        function handleError(e) {
+            self.postMessage({
+                error: JSON.stringify(e),
+                body: e,
+                fail: true
+            });
+        }
 
-    localforage.setDriver(e.data.driver, function() {
-        localforage.setItem('web worker', e.data.value, function() {
-            localforage.getItem('web worker', function(err, value) {
-                self.postMessage({
-                    body: value
-                });
-            });
-        }, handleError).catch(handleError);
-    }, handleError);
-}, false);
+        localforage.setDriver(
+            e.data.driver,
+            function() {
+                localforage
+                    .setItem(
+                        'web worker',
+                        e.data.value,
+                        function() {
+                            localforage.getItem('web worker', function(
+                                err,
+                                value
+                            ) {
+                                self.postMessage({
+                                    body: value
+                                });
+                            });
+                        },
+                        handleError
+                    )
+                    .catch(handleError);
+            },
+            handleError
+        );
+    },
+    false
+);

typing-tests/localforage-tests.ts

@@ -1,4 +0,4 @@
-/// <reference path="../typings/localforage.d.ts" />
+import * as localforage from 'localforage';
 
-declare let localForage: LocalForage;
+let localForage: LocalForage = localforage;
 
@@ -129,2 +129,47 @@ namespace LocalForageTest {
 
+    const customDriver: LocalForageDriver = {
+        _driver: "CustomDriver",
+        _initStorage: (options: LocalForageOptions) => {},
+        getItem: <T>(key: string, callback?: (err: any, value: T) => void) => Promise.resolve({} as T),
+        setItem: <T>(key: string, value: T, callback?: (err: any, value: T) => void) => Promise.resolve(value),
+        removeItem: (key: string, callback?: (err: any) => void) => Promise.resolve(),
+        clear: (callback?: (err: any) => void) => Promise.resolve(),
+        length: (callback?: (err: any, numberOfKeys: number) => void) => Promise.resolve(5),
+        key: (keyIndex: number, callback?: (err: any, key: string) => void) => Promise.resolve('aKey'),
+        keys: (callback?: (err: any, keys: string[]) => void) => Promise.resolve(['1', '2']),
+        iterate: <T, U>(iteratee: (value: T, key: string, iterationNumber: number) => U, callback?: (err: any, result: U) => void) => Promise.resolve({} as U),
+    };
+    localForage.defineDriver(customDriver);
+
+    const customDriver2: LocalForageDriver = {
+        _driver: "CustomDriver",
+        _initStorage: (options: LocalForageOptions) => {},
+        _support: true,
+        getItem: <T>(key: string, callback?: (err: any, value: T) => void) => Promise.resolve({} as T),
+        setItem: <T>(key: string, value: T, callback?: (err: any, value: T) => void) => Promise.resolve(value),
+        removeItem: (key: string, callback?: (err: any) => void) => Promise.resolve(),
+        clear: (callback?: (err: any) => void) => Promise.resolve(),
+        length: (callback?: (err: any, numberOfKeys: number) => void) => Promise.resolve(5),
+        key: (keyIndex: number, callback?: (err: any, key: string) => void) => Promise.resolve('aKey'),
+        keys: (callback?: (err: any, keys: string[]) => void) => Promise.resolve(['1', '2']),
+        iterate: <T, U>(iteratee: (value: T, key: string, iterationNumber: number) => U, callback?: (err: any, result: U) => void) => Promise.resolve({} as U),
+    };
+    localForage.defineDriver(customDriver2);
+
+    const customDriver3: LocalForageDriver = {
+        _driver: "CustomDriver",
+        _initStorage: (options: LocalForageOptions) => {},
+        _support: () => Promise.resolve(true),
+        getItem: <T>(key: string, callback?: (err: any, value: T) => void) => Promise.resolve({} as T),
+        setItem: <T>(key: string, value: T, callback?: (err: any, value: T) => void) => Promise.resolve(value),
+        removeItem: (key: string, callback?: (err: any) => void) => Promise.resolve(),
+        clear: (callback?: (err: any) => void) => Promise.resolve(),
+        length: (callback?: (err: any, numberOfKeys: number) => void) => Promise.resolve(5),
+        key: (keyIndex: number, callback?: (err: any, key: string) => void) => Promise.resolve('aKey'),
+        keys: (callback?: (err: any, keys: string[]) => void) => Promise.resolve(['1', '2']),
+        iterate: <T, U>(iteratee: (value: T, key: string, iterationNumber: number) => U, callback?: (err: any, result: U) => void) => Promise.resolve({} as U),
+        dropInstance: (dbInstanceOptions?: LocalForageDbInstanceOptions, callback?: (err: any) => void) => Promise.resolve(),
+    };
+    localForage.defineDriver(customDriver3);
+
     localForage.getDriver("CustomDriver").then((result: LocalForageDriver) => {
@@ -147,2 +192,8 @@ var driver: LocalForageDriver = result;
 
+        const configOptions: LocalForageOptions = {
+            name: "testyo",
+            driver: localForage.LOCALSTORAGE
+        };
+
+        config = localForage.config(configOptions);
         config = localForage.config({
@@ -157,2 +208,8 @@ name: "testyo",
 
+        const configOptions: LocalForageOptions = {
+            name: "da instance",
+            driver: localForage.LOCALSTORAGE
+        };
+
+        store = localForage.createInstance(configOptions);
         store = localForage.createInstance({
@@ -165,2 +222,26 @@ name: "da instance",
     {
+        localForage.dropInstance().then(() => {});
+
+        const dropInstanceOptions: LocalForageDbInstanceOptions = {
+            name: "da instance",
+            storeName: "da store"
+        };
+
+        localForage.dropInstance(dropInstanceOptions).then(() => {});
+
+        localForage.dropInstance({
+            name: "da instance",
+            storeName: "da store"
+        }).then(() => {});
+
+        const dropDbOptions: LocalForageDbInstanceOptions = {
+            name: "da instance",
+        };
+
+        localForage.dropInstance({
+            name: "da instance",
+        }).then(() => {});
+    }
+
+    {
         let testSerializer: LocalForageSerializer;
@@ -167,0 +248,0 @@

typings/localforage.d.ts

@@ -0,11 +1,12 @@
+interface LocalForageDbInstanceOptions {
+    name?: string;
 
-interface LocalForageOptions {
+    storeName?: string;
+}
+
+interface LocalForageOptions extends LocalForageDbInstanceOptions {
     driver?: string | string[];
 
-    name?: string;
-
     size?: number;
 
-    storeName?: string;
-
     version?: number;
@@ -16,29 +17,37 @@
 
-interface LocalForageDbMethods {
-    getItem<T>(key: string): Promise<T>;
-    getItem<T>(key: string, callback: (err: any, value: T) => void): void;
+interface LocalForageDbMethodsCore {
+    getItem<T>(key: string, callback?: (err: any, value: T) => void): Promise<T>;
 
-    setItem<T>(key: string, value: T): Promise<T>;
-    setItem<T>(key: string, value: T, callback: (err: any, value: T) => void): void;
+    setItem<T>(key: string, value: T, callback?: (err: any, value: T) => void): Promise<T>;
 
-    removeItem(key: string): Promise<void>;
-    removeItem(key: string, callback: (err: any) => void): void;
+    removeItem(key: string, callback?: (err: any) => void): Promise<void>;
 
-    clear(): Promise<void>;
-    clear(callback: (err: any) => void): void;
+    clear(callback?: (err: any) => void): Promise<void>;
 
-    length(): Promise<number>;
-    length(callback: (err: any, numberOfKeys: number) => void): void;
+    length(callback?: (err: any, numberOfKeys: number) => void): Promise<number>;
 
-    key(keyIndex: number): Promise<string>;
-    key(keyIndex: number, callback: (err: any, key: string) => void): void;
+    key(keyIndex: number, callback?: (err: any, key: string) => void): Promise<string>;
 
-    keys(): Promise<string[]>;
-    keys(callback: (err: any, keys: string[]) => void): void;
+    keys(callback?: (err: any, keys: string[]) => void): Promise<string[]>;
 
-    iterate<T, U>(iteratee: (value: T, key: string, iterationNumber: number) => U): Promise<U>;
     iterate<T, U>(iteratee: (value: T, key: string, iterationNumber: number) => U,
-            callback: (err: any, result: U) => void): void;
+            callback?: (err: any, result: U) => void): Promise<U>;
 }
 
+interface LocalForageDropInstanceFn {
+    (dbInstanceOptions?: LocalForageDbInstanceOptions, callback?: (err: any) => void): Promise<void>;
+}
+
+interface LocalForageDriverMethodsOptional {
+    dropInstance?: LocalForageDropInstanceFn;
+}
+
+// duplicating LocalForageDriverMethodsOptional to preserve TS v2.0 support,
+// since Partial<> isn't supported there
+interface LocalForageDbMethodsOptional {
+    dropInstance: LocalForageDropInstanceFn;
+}
+
+interface LocalForageDriverDbMethods extends LocalForageDbMethodsCore, LocalForageDriverMethodsOptional {}
+
 interface LocalForageDriverSupportFunc {
@@ -48,3 +57,3 @@ (): Promise<boolean>;
 
-interface LocalForageDriver extends LocalForageDbMethods {
+interface LocalForageDriver extends LocalForageDriverDbMethods {
     _driver: string;
@@ -67,2 +76,4 @@
 
+interface LocalForageDbMethods extends LocalForageDbMethodsCore, LocalForageDbMethodsOptional {}
+
 interface LocalForage extends LocalForageDbMethods {
@@ -90,2 +101,3 @@ LOCALSTORAGE: string;
     driver(): string;
+
     /**
@@ -95,7 +107,6 @@ * Force usage of a particular driver or drivers, if available.
      */
-    setDriver(driver: string | string[]): Promise<void>;
-    setDriver(driver: string | string[], callback: () => void, errorCallback: (error: any) => void): void;
+    setDriver(driver: string | string[], callback?: () => void, errorCallback?: (error: any) => void): Promise<void>;
 
-    defineDriver(driver: LocalForageDriver): Promise<void>;
-    defineDriver(driver: LocalForageDriver, callback: () => void, errorCallback: (error: any) => void): void;
+    defineDriver(driver: LocalForageDriver, callback?: () => void, errorCallback?: (error: any) => void): Promise<void>;
+
     /**
@@ -107,9 +118,7 @@ * Return a particular driver
 
-    getSerializer(): Promise<LocalForageSerializer>;
-    getSerializer(callback: (serializer: LocalForageSerializer) => void): void;
+    getSerializer(callback?: (serializer: LocalForageSerializer) => void): Promise<LocalForageSerializer>;
 
     supports(driverName: string): boolean;
 
-    ready(callback: (error: any) => void): void;
-    ready(): Promise<void>;
+    ready(callback?: (error: any) => void): Promise<void>;
 }
@@ -116,0 +125,0 @@

New alerts

License Policy Violation

License

This package is not allowed per your license policy. Review the package's license to ensure compliance.

Found 1 instance in 1 package

Fixed alerts

License Policy Violation

License

This package is not allowed per your license policy. Review the package's license to ensure compliance.

Found 1 instance in 1 package

Improved metrics

Total package byte prevSize

976227

increased by11.18%

Number of package files

93

increased by6.9%

Lines of code

15605

increased by16.52%

Number of lines in readme file

268

increased by0.75%

Worsened metrics

Dev dependency count

39

increased by11.43%

No dependency changes