localforage - npm Package Compare versions

Comparing version 1.5.0 to 1.5.1

bower.json

@@ -28,3 +28,3 @@ {
   },
-  "version": "1.5.0"
+  "version": "1.5.1"
 }

CHANGELOG.md

@@ -7,3 +7,3 @@ # About this CHANGELOG
 ### [1.5](https://github.com/mozilla/localForage/releases/tag/1.5.0)
-* **Major storage engine change for Safari**: We now use IndexedDB as the storage engine for Saferi v10.1 (and above). This means sites using localForage for data storage with users using Safari `< 10.1` will experience "data loss". In fact no data is lost but the engine will change so localForage will seem empty. You can still force a connection to WebSQL using [localForage's config](https://localforage.github.io/localForage/#settings-api-setdriver) to either keep using your existing WebSQL database or migrate to IndexedDB.
+* **Major storage engine change for Safari**: We now use IndexedDB as the storage engine for Safari v10.1 (and above). This means sites using localForage for data storage with users using Safari `< 10.1` will experience "data loss". In fact no data is lost but the engine will change so localForage will seem empty. You can still force a connection to WebSQL using [localForage's config](https://localforage.github.io/localForage/#settings-api-setdriver) to either keep using your existing WebSQL database or migrate to IndexedDB.
 
@@ -14,3 +14,3 @@ ### [1.4.2](https://github.com/mozilla/localForage/releases/tag/1.4.2)
 ### [1.4.1](https://github.com/mozilla/localForage/releases/tag/1.4.1)
-* Fixes #520; browserify builds work propertly
+* Fixes #520; browserify builds work properly
 
@@ -17,0 +17,0 @@ ### [1.4](https://github.com/mozilla/localForage/releases/tag/1.4.0)

dist/localforage.min.js

 /*!
     localForage -- Offline Storage, Improved
-    Version 1.5.0
+    Version 1.5.1
     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 1.5.0
+    Version 1.5.1
     https://localforage.github.io/localForage
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h(c,a),c}function ea(a,b){var c=this;a=j(a);var d=c.ready().then(function(){var b=c._dbInfo;localStorage.removeItem(b.keyPrefix+a)});return h(d,b),d}function fa(a,b,c){var d=this;a=j(a);var e=d.ready().then(function(){void 0===b&&(b=null);var c=b;return new ma(function(e,f){var g=d._dbInfo;g.serializer.serialize(b,function(b,d){if(d)f(d);else try{localStorage.setItem(g.keyPrefix+a,b),e(c)}catch(a){"QuotaExceededError"!==a.name&&"NS_ERROR_DOM_QUOTA_REACHED"!==a.name||f(a),f(a)}})})});return h(e,c),e}function ga(a,b){a[b]=function(){var c=arguments;return a.ready().then(function(){return a[b].apply(a,c)})}}function ha(){for(var a=1;a<arguments.length;a++){var b=arguments[a];if(b)for(var c in b)b.hasOwnProperty(c)&&(Na(b[c])?arguments[0][c]=b[c].slice():arguments[0][c]=b[c])}return arguments[0]}var ia="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(a){return typeof a}:function(a){return a&&"function"==typeof Symbol&&a.constructor===Symbol&&a!==Symbol.prototype?"symbol":typeof a},ja=e();"undefined"==typeof Promise&&a("lie/polyfill");var ka,la,ma=Promise,na="local-forage-detect-blob-support",oa=Object.prototype.toString,pa="readonly",qa="readwrite",ra={_driver:"asyncStorage",_initStorage:A,_support:f(),iterate:C,getItem:B,setItem:D,removeItem:E,clear:F,length:G,key:H,keys:I},sa="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",ta="~~local_forage_type~",ua=/^~~local_forage_type~([^~]+)~/,va="__lfsc__:",wa=va.length,xa="arbf",ya="blob",za="si08",Aa="ui08",Ba="uic8",Ca="si16",Da="si32",Ea="ur16",Fa="ui32",Ga="fl32",Ha="fl64",Ia=wa+xa.length,Ja=Object.prototype.toString,Ka={serialize:M,deserialize:N,stringToBuffer:K,bufferToString:L},La={_driver:"webSQLStorage",_initStorage:O,_support:J(),iterate:Q,getItem:P,setItem:S,removeItem:T,clear:U,length:V,key:W,keys:X},Ma={_driver:"localStorageWrapper",_initStorage:Z,_support:Y(),iterate:aa,getItem:_,setItem:fa,removeItem:ea,clear:$,length:da,key:ba,keys:ca},Na=Array.isArray||function(a){return"[object 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a){if("storeName"===b&&(a[b]=a[b].replace(/\W/g,"_")),"version"===b&&"number"!=typeof a[b])return new Error("Database version must be a number.");this._config[b]=a[b]}return!("driver"in a&&a.driver)||this.setDriver(this._config.driver)}return"string"==typeof a?this._config[a]:this._config},a.prototype.defineDriver=function(a,b,c){var d=new ma(function(b,c){try{var d=a._driver,e=new Error("Custom driver not compliant; see https://mozilla.github.io/localForage/#definedriver");if(!a._driver)return void c(e);for(var f=Ta.concat("_initStorage"),g=0,h=f.length;g<h;g++){var i=f[g];if(!i||!a[i]||"function"!=typeof a[i])return void c(e)}var j=function(c){Oa[d]&&console.info("Redefining LocalForage driver: "+d),Oa[d]=a,Pa[d]=c,b()};"_support"in a?a._support&&"function"==typeof a._support?a._support().then(j,c):j(!!a._support):j(!0)}catch(a){c(a)}});return i(d,b,c),d},a.prototype.driver=function(){return this._driver||null},a.prototype.getDriver=function(a,b,c){var d=Oa[a]?ma.resolve(Oa[a]):ma.reject(new Error("Driver not found."));return i(d,b,c),d},a.prototype.getSerializer=function(a){var b=ma.resolve(Ka);return i(b,a),b},a.prototype.ready=function(a){var b=this,c=b._driverSet.then(function(){return null===b._ready&&(b._ready=b._initDriver()),b._ready});return i(c,a,a),c},a.prototype.setDriver=function(a,b,c){function d(){g._config.driver=g.driver()}function e(a){return g._extend(a),d(),g._ready=g._initStorage(g._config),g._ready}function f(a){return function(){function b(){for(;c<a.length;){var f=a[c];return c++,g._dbInfo=null,g._ready=null,g.getDriver(f).then(e).catch(b)}d();var h=new Error("No available storage method found.");return g._driverSet=ma.reject(h),g._driverSet}var c=0;return b()}}var g=this;Na(a)||(a=[a]);var h=this._getSupportedDrivers(a),j=null!==this._driverSet?this._driverSet.catch(function(){return ma.resolve()}):ma.resolve();return this._driverSet=j.then(function(){var a=h[0];return g._dbInfo=null,g._ready=null,g.getDriver(a).then(function(a){g._driver=a._driver,d(),g._wrapLibraryMethodsWithReady(),g._initDriver=f(h)})}).catch(function(){d();var a=new Error("No available storage method found.");return g._driverSet=ma.reject(a),g._driverSet}),i(this._driverSet,b,c),this._driverSet},a.prototype.supports=function(a){return!!Pa[a]},a.prototype._extend=function(a){ha(this,a)},a.prototype._getSupportedDrivers=function(a){for(var b=[],c=0,d=a.length;c<d;c++){var e=a[c];this.supports(e)&&b.push(e)}return b},a.prototype._wrapLibraryMethodsWithReady=function(){for(var a=0,b=Ta.length;a<b;a++)ga(this,Ta[a])},a.prototype.createInstance=function(b){return new a(b)},a}(),Wa=new Va;b.exports=Wa},{undefined:void 0}]},{},[1])(1)});

docs/api.md

@@ -384,3 +384,3 @@ # localForage
 
-# Custom Driver API
+# Driver API
 
@@ -446,2 +446,22 @@ You can write your own, custom driver for localForage since **version 1.1**.
 
+<aside class="notice">
+  In case that a driver fails during or right after the initialization process, then localForage will try to use the next in order driver. That is with respect to the default driver order while loading localForage or to the order the drivers were passed to `setDriver()`.
+</aside>
+
+## ready
+
+```js
+localforage.ready().then(function() {
+    // This code runs once localforage
+    // has fully initialized the selected driver.
+    console.log(localforage.driver()); // LocalStorage
+}).catch(function (e) {
+    console.log(e); // `No available storage method found.`
+    // One of the cases that `ready()` rejects,
+    // is when no usable storage driver is found
+});
+```
+
+Even though localForage queues up all of its data API method calls, `ready()` provides a way to determine whether the asynchronous driver initialization process has finished. That's useful in cases like when we want to know which driver localForage has settled down using.
+
 ## supports
@@ -448,0 +468,0 @@

docs/README.txt

@@ -8,3 +8,3 @@ # localForage Docs #
 These are the API docs for
-[localForage](http://mozilla.github.io/localForage). You can browse the
-code in the [master branch](https://github.com/mozilla/localForage).
+[localForage](http://localForage.github.io/localForage). You can browse the
+code in the [master branch](https://github.com/localForage/localForage).

Gruntfile.js

@@ -1,2 +0,1 @@
-/* jshint node:true */
 var path = require('path');
@@ -139,11 +138,5 @@ var saucelabsBrowsers = require(path.resolve('test', 'saucelabs-browsers.js'));
         },
-        jscs: {
-            source: sourceFiles
+        eslint: {
+            target: sourceFiles
         },
-        jshint: {
-            options: {
-                jshintrc: '.jshintrc'
-            },
-            source: sourceFiles
-        },
         mocha: {
@@ -206,3 +199,2 @@ unit: {
             },
-            /*jshint scripturl:true */
             'mocha:unit': {
@@ -215,4 +207,3 @@ files: [
                 tasks: [
-                    'jshint',
-                    'jscs',
+                    'eslint',
                     'browserify:package_bundling_test',
@@ -246,4 +237,3 @@ 'webpack:package_bundling_test',
         'babel',
-        'jshint',
-        'jscs',
+        'eslint',
         'ts:typing_tests',
@@ -250,0 +240,0 @@ 'browserify:package_bundling_test',

package.json

@@ -12,3 +12,3 @@ {
   ],
-  "version": "1.5.0",
+  "version": "1.5.1",
   "homepage": "https://github.com/localForage/localForage",
@@ -20,3 +20,5 @@ "repository": {
   "scripts": {
+    "build": "node -e \"require('grunt').cli()\" null build",
     "publish-docs": "node -e \"require('grunt').cli()\" null copy build-rules-html publish-rules",
+    "serve": "node -e \"require('grunt').cli()\" null serve",
     "test": "node -e \"require('grunt').cli()\" null test"
@@ -26,2 +28,3 @@ },
     "babel-core": "^6.5.1",
+    "babel-eslint": "^7.2.3",
     "babel-loader": "^6.2.2",
@@ -41,7 +44,6 @@ "babel-plugin-add-module-exports": "^0.1.2",
     "grunt-contrib-connect": "^0.8.0",
-    "grunt-contrib-jshint": "^1.0.0",
     "grunt-contrib-uglify": "^0.4.0",
     "grunt-contrib-watch": "^0.5.0",
     "grunt-es3-safe-recast": "^0.1.0",
-    "grunt-jscs": "^1.5.0",
+    "grunt-eslint": "^20.0.0",
     "grunt-mocha": "^0.4.10",
@@ -54,4 +56,4 @@ "grunt-rollup": "^0.6.2",
     "load-grunt-tasks": "^0.4.0",
-    "mocha": "^1.18.2",
-    "phantomjs": "^1.9.7-12",
+    "mocha": "^3.4.2",
+    "phantomjs": "^2.1.7",
     "rollupify": "^0.1.0",
@@ -58,0 +60,0 @@ "script-loader": "^0.6.1",

README.md

@@ -17,5 +17,6 @@ # localForage
 ```html
-<script src="localforage.js"></script>
+<script src="localforage/dist/localforage.js"></script>
 <script>localforage.getItem('something', myCallback);</script>
 ```
+Try the [live example](http://codepen.io/thgreasi/pen/ojYKeE).
 
@@ -50,3 +51,3 @@ Download the [latest localForage from GitHub](https://github.com/localForage/localForage/releases/latest), or install with
 The best person to ask about localForage is [**tofumatt**][tofumatt], who
-is usually online from 8am-8pm GMT (London Time).
+is usually online from 10am-8pm GMT.
 
@@ -109,3 +110,3 @@ [tofumatt]: http://tofumatt.com/
 
-[api]: https://localforage.github.io/localForage/#setitem
+[api]: https://localforage.github.io/localForage/#data-api-setitem
 
@@ -208,2 +209,3 @@ ## Configuration
 * [Ember](https://github.com/genkgo/ember-localforage-adapter)
+* [Vue](https://github.com/dmlzj/vlf)
 
@@ -217,3 +219,3 @@ If you have a driver you'd like listed, please
 You can create your own driver if you want; see the
-[`defineDriver`](https://localforage.github.io/localForage/#definedriver) API docs.
+[`defineDriver`](https://localforage.github.io/localForage/#driver-api-definedriver) API docs.
 
@@ -220,0 +222,0 @@ There is a [list of custom drivers on the wiki][custom drivers].

src/drivers/indexeddb.js

@@ -0,1 +1,2 @@
+import isIndexedDBValid from '../utils/isIndexedDBValid';
 import createBlob from '../utils/createBlob';
@@ -6,2 +7,3 @@ import idb from '../utils/idb';
 import executeTwoCallbacks from '../utils/executeTwoCallbacks';
+import normalizeKey from '../utils/normalizeKey';
 
@@ -16,2 +18,6 @@ // Some code originally from async_storage.js in
 
+// Transaction Modes
+var READ_ONLY = 'readonly';
+var READ_WRITE = 'readwrite';
+
 // Transform a binary string to an array buffer, because otherwise
@@ -49,3 +55,3 @@ // weird stuff happens when you try to work with the binary string directly.
     return new Promise(function(resolve) {
-        var txn = idb.transaction(DETECT_BLOB_SUPPORT_STORE, 'readwrite');
+        var txn = idb.transaction(DETECT_BLOB_SUPPORT_STORE, READ_WRITE);
         var blob = createBlob(['']);
@@ -121,2 +127,15 @@ txn.objectStore(DETECT_BLOB_SUPPORT_STORE).put(blob, 'key');
 
+function _rejectReadiness(dbInfo, err) {
+    var dbContext = dbContexts[dbInfo.name];
+
+    // Dequeue a deferred operation.
+    var deferredOperation = dbContext.deferredOperations.pop();
+
+    // Reject its promise (which is part of the database readiness
+    // chain of promises).
+    if (deferredOperation) {
+        deferredOperation.reject(err);
+    }
+}
+
 function _getConnection(dbInfo, upgradeNeeded) {
@@ -269,2 +288,50 @@ return new Promise(function(resolve, reject) {
 
+// Try to establish a new db connection to replace the
+// current one which is broken (i.e. experiencing
+// InvalidStateError while creating a transaction).
+function _tryReconnect(dbInfo) {
+    _deferReadiness(dbInfo);
+
+    var dbContext = dbContexts[dbInfo.name];
+    var forages = dbContext.forages;
+
+    for (var i = 0; i < forages.length; i++) {
+        if (forages[i]._dbInfo.db) {
+            forages[i]._dbInfo.db.close();
+            forages[i]._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;
+    });
+}
+
+
+// FF doesn't like Promises (micro-tasks) and IDDB store operations,
+// so we have to do it with callbacks
+function createTransaction(dbInfo, mode, callback) {
+    try {
+        var tx = dbInfo.db.transaction(dbInfo.storeName, mode);
+        callback(null, tx);
+    } catch (err) {
+        if (!dbInfo.db ||
+            err.name === 'InvalidStateError') {
+            return _tryReconnect(dbInfo).then(function() {
+
+                var tx = dbInfo.db.transaction(dbInfo.storeName, mode);
+                callback(null, tx);
+            });
+        }
+
+        callback(err);
+    }
+}
+
+
 // Open the IndexedDB database (automatically creates one if one didn't
@@ -363,33 +430,37 @@ // previously exist), using any options set in the config.
 
+
 function getItem(key, callback) {
     var self = this;
 
-    // Cast the key to a string, as that's all we can set as a key.
-    if (typeof key !== 'string') {
-        console.warn(key +
-            ' used as a key, but it is not a string.');
-        key = String(key);
-    }
+    key = normalizeKey(key);
 
     var promise = new Promise(function(resolve, reject) {
         self.ready().then(function() {
-            var dbInfo = self._dbInfo;
-            var store = dbInfo.db.transaction(dbInfo.storeName, 'readonly')
-                .objectStore(dbInfo.storeName);
-            var req = store.get(key);
+            createTransaction(self._dbInfo, READ_ONLY, function(err, transaction) {
+                if (err) {
+                    return reject(err);
+                }
 
-            req.onsuccess = function() {
-                var value = req.result;
-                if (value === undefined) {
-                    value = null;
+                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.onerror = function() {
+                        reject(req.error);
+                    };
+                } catch (e) {
+                    reject(e);
                 }
-                if (_isEncodedBlob(value)) {
-                    value = _decodeBlob(value);
-                }
-                resolve(value);
-            };
-
-            req.onerror = function() {
-                reject(req.error);
-            };
+            });
         }).catch(reject);
@@ -408,33 +479,43 @@ });
         self.ready().then(function() {
-            var dbInfo = self._dbInfo;
-            var store = dbInfo.db.transaction(dbInfo.storeName, 'readonly')
-                .objectStore(dbInfo.storeName);
+            createTransaction(self._dbInfo, READ_ONLY, function(err, transaction) {
+                if (err) {
+                    return reject(err);
+                }
 
-            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++);
 
-                    if (result !== void(0)) {
-                        resolve(result);
-                    } else {
-                        cursor.continue();
-                    }
-                } else {
-                    resolve();
+                            // 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 {
+                            resolve();
+                        }
+                    };
+
+                    req.onerror = function() {
+                        reject(req.error);
+                    };
+                } catch (e) {
+                    reject(e);
                 }
-            };
-
-            req.onerror = function() {
-                reject(req.error);
-            };
+            });
         }).catch(reject);
@@ -451,8 +532,3 @@ });
 
-    // Cast the key to a string, as that's all we can set as a key.
-    if (typeof key !== 'string') {
-        console.warn(key +
-            ' used as a key, but it is not a string.');
-        key = String(key);
-    }
+    key = normalizeKey(key);
 
@@ -473,31 +549,40 @@ var promise = new Promise(function(resolve, reject) {
         }).then(function(value) {
-            var transaction = dbInfo.db.transaction(dbInfo.storeName, 'readwrite');
-            var store = transaction.objectStore(dbInfo.storeName);
-            var req = store.put(value, key);
+            createTransaction(self._dbInfo, READ_WRITE, function(err, transaction) {
+                if (err) {
+                    return reject(err);
+                }
 
-            // 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;
-            }
+                try {
+                    var store = transaction.objectStore(self._dbInfo.storeName);
+                    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;
+                    // 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;
+                    }
+
+                    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);
                 }
-
-                resolve(value);
-            };
-            transaction.onabort = transaction.onerror = function() {
-                var err = req.error ? req.error : req.transaction.error;
-                reject(err);
-            };
+            });
         }).catch(reject);
@@ -513,35 +598,37 @@ });
 
-    // Cast the key to a string, as that's all we can set as a key.
-    if (typeof key !== 'string') {
-        console.warn(key +
-            ' used as a key, but it is not a string.');
-        key = String(key);
-    }
+    key = normalizeKey(key);
 
     var promise = new Promise(function(resolve, reject) {
         self.ready().then(function() {
-            var dbInfo = self._dbInfo;
-            var transaction = dbInfo.db.transaction(dbInfo.storeName, 'readwrite');
-            var store = transaction.objectStore(dbInfo.storeName);
+            createTransaction(self._dbInfo, READ_WRITE, function(err, transaction) {
+                if (err) {
+                    return reject(err);
+                }
 
-            // 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);
-            };
+                    // 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);
@@ -559,15 +646,23 @@ });
         self.ready().then(function() {
-            var dbInfo = self._dbInfo;
-            var transaction = dbInfo.db.transaction(dbInfo.storeName, 'readwrite');
-            var store = transaction.objectStore(dbInfo.storeName);
-            var req = store.clear();
+            createTransaction(self._dbInfo, READ_WRITE, function(err, transaction) {
+                if (err) {
+                    return reject(err);
+                }
 
-            transaction.oncomplete = function() {
-                resolve();
-            };
+                try {
+                    var store = transaction.objectStore(self._dbInfo.storeName);
+                    var req = store.clear();
 
-            transaction.onabort = transaction.onerror = function() {
-                var err = req.error ? req.error : req.transaction.error;
-                reject(err);
-            };
+                    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);
@@ -585,14 +680,22 @@ });
         self.ready().then(function() {
-            var dbInfo = self._dbInfo;
-            var store = dbInfo.db.transaction(dbInfo.storeName, 'readonly')
-                .objectStore(dbInfo.storeName);
-            var req = store.count();
+            createTransaction(self._dbInfo, READ_ONLY, function(err, transaction) {
+                if (err) {
+                    return reject(err);
+                }
 
-            req.onsuccess = function() {
-                resolve(req.result);
-            };
+                try {
+                    var store = transaction.objectStore(self._dbInfo.storeName);
+                    var req = store.count();
 
-            req.onerror = function() {
-                reject(req.error);
-            };
+                    req.onsuccess = function() {
+                        resolve(req.result);
+                    };
+
+                    req.onerror = function() {
+                        reject(req.error);
+                    };
+                } catch (e) {
+                    reject(e);
+                }
+            });
         }).catch(reject);
@@ -616,37 +719,45 @@ });
         self.ready().then(function() {
-            var dbInfo = self._dbInfo;
-            var store = dbInfo.db.transaction(dbInfo.storeName, 'readonly')
-                .objectStore(dbInfo.storeName);
+            createTransaction(self._dbInfo, READ_ONLY, function(err, transaction) {
+                if (err) {
+                    return reject(err);
+                }
 
-            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);
+                try {
+                    var store = transaction.objectStore(self._dbInfo.storeName);
+                    var advanced = false;
+                    var req = store.openCursor();
 
-                    return;
-                }
+                    req.onsuccess = function() {
+                        var cursor = req.result;
+                        if (!cursor) {
+                            // this means there weren't enough keys
+                            resolve(null);
 
-                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);
-                    } else {
-                        // When we get here, we've got the nth key.
-                        resolve(cursor.key);
-                    }
+                            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);
+                            } else {
+                                // When we get here, we've got the nth key.
+                                resolve(cursor.key);
+                            }
+                        }
+                    };
+
+                    req.onerror = function() {
+                        reject(req.error);
+                    };
+                } catch (e) {
+                    reject(e);
                 }
-            };
-
-            req.onerror = function() {
-                reject(req.error);
-            };
+            });
         }).catch(reject);
@@ -664,24 +775,31 @@ });
         self.ready().then(function() {
-            var dbInfo = self._dbInfo;
-            var store = dbInfo.db.transaction(dbInfo.storeName, 'readonly')
-                .objectStore(dbInfo.storeName);
+            createTransaction(self._dbInfo, READ_ONLY, function(err, transaction) {
+                if (err) {
+                    return reject(err);
+                }
 
-            var req = store.openCursor();
-            var keys = [];
+                try {
+                    var store = transaction.objectStore(self._dbInfo.storeName);
+                    var req = store.openCursor();
+                    var keys = [];
 
-            req.onsuccess = function() {
-                var cursor = req.result;
+                    req.onsuccess = function() {
+                        var cursor = req.result;
 
-                if (!cursor) {
-                    resolve(keys);
-                    return;
-                }
+                        if (!cursor) {
+                            resolve(keys);
+                            return;
+                        }
 
-                keys.push(cursor.key);
-                cursor.continue();
-            };
+                        keys.push(cursor.key);
+                        cursor.continue();
+                    };
 
-            req.onerror = function() {
-                reject(req.error);
-            };
+                    req.onerror = function() {
+                        reject(req.error);
+                    };
+                } catch (e) {
+                    reject(e);
+                }
+            });
         }).catch(reject);
@@ -697,2 +815,3 @@ });
     _initStorage: _initStorage,
+    _support: isIndexedDBValid(),
     iterate: iterate,
@@ -699,0 +818,0 @@ getItem: getItem,

src/drivers/localstorage.js

@@ -6,5 +6,7 @@ // If IndexedDB isn't available, we'll fall back to localStorage.
 
+import isLocalStorageValid from '../utils/isLocalStorageValid';
 import serializer from '../utils/serializer';
 import Promise from '../utils/promise';
 import executeCallback from '../utils/executeCallback';
+import normalizeKey from '../utils/normalizeKey';
 
@@ -59,8 +61,3 @@ // Config the localStorage backend, using options set in the config.
 
-    // Cast the key to a string, as that's all we can set as a key.
-    if (typeof key !== 'string') {
-        console.warn(key +
-            ' used as a key, but it is not a string.');
-        key = String(key);
-    }
+    key = normalizeKey(key);
 
@@ -120,3 +117,3 @@ var promise = self.ready().then(function() {
             value = iterator(value, key.substring(keyPrefixLength),
-                iterationNumber++);
+                             iterationNumber++);
 
@@ -192,8 +189,3 @@ if (value !== void(0)) {
 
-    // Cast the key to a string, as that's all we can set as a key.
-    if (typeof key !== 'string') {
-        console.warn(key +
-            ' used as a key, but it is not a string.');
-        key = String(key);
-    }
+    key = normalizeKey(key);
 
@@ -216,8 +208,3 @@ var promise = self.ready().then(function() {
 
-    // Cast the key to a string, as that's all we can set as a key.
-    if (typeof key !== 'string') {
-        console.warn(key +
-            ' used as a key, but it is not a string.');
-        key = String(key);
-    }
+    key = normalizeKey(key);
 
@@ -264,3 +251,3 @@ var promise = self.ready().then(function() {
     _initStorage: _initStorage,
-    // Default API, from Gaia/localStorage.
+    _support: isLocalStorageValid(),
     iterate: iterate,
@@ -267,0 +254,0 @@ getItem: getItem,

src/drivers/websql.js

@@ -0,4 +1,6 @@
+import isWebSQLValid from '../utils/isWebSQLValid';
 import serializer from '../utils/serializer';
 import Promise from '../utils/promise';
 import executeCallback from '../utils/executeCallback';
+import normalizeKey from '../utils/normalizeKey';
 
@@ -25,3 +27,3 @@ /*
             dbInfo[i] = typeof(options[i]) !== 'string' ?
-                        options[i].toString() : options[i];
+                options[i].toString() : options[i];
         }
@@ -42,10 +44,11 @@ }
         dbInfo.db.transaction(function(t) {
-            t.executeSql('CREATE TABLE IF NOT EXISTS ' + dbInfo.storeName +
-                         ' (id INTEGER PRIMARY KEY, key unique, value)', [],
-                         function() {
-                self._dbInfo = dbInfo;
-                resolve();
-            }, function(t, error) {
-                reject(error);
-            });
+            t.executeSql(
+                'CREATE TABLE IF NOT EXISTS ' + dbInfo.storeName +
+                ' (id INTEGER PRIMARY KEY, key unique, value)', [],
+                function() {
+                    self._dbInfo = dbInfo;
+                    resolve();
+                }, function(t, error) {
+                    reject(error);
+                });
         });
@@ -61,8 +64,3 @@ });
 
-    // Cast the key to a string, as that's all we can set as a key.
-    if (typeof key !== 'string') {
-        console.warn(key +
-                            ' used as a key, but it is not a string.');
-        key = String(key);
-    }
+    key = normalizeKey(key);
 
@@ -73,19 +71,20 @@ var promise = new Promise(function(resolve, reject) {
             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;
+                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;
 
-                    // 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) {
+                        resolve(result);
+                    }, function(t, error) {
 
-                    reject(error);
-                });
+                        reject(error);
+                    });
             });
@@ -107,3 +106,4 @@ }).catch(reject);
             dbInfo.db.transaction(function(t) {
-                t.executeSql('SELECT * FROM ' + dbInfo.storeName, [],
+                t.executeSql(
+                    'SELECT * FROM ' + dbInfo.storeName, [],
                     function(t, results) {
@@ -148,8 +148,3 @@ var rows = results.rows;
 
-    // Cast the key to a string, as that's all we can set as a key.
-    if (typeof key !== 'string') {
-        console.warn(key +
-                            ' used as a key, but it is not a string.');
-        key = String(key);
-    }
+    key = normalizeKey(key);
 
@@ -174,10 +169,12 @@ var promise = new Promise(function(resolve, reject) {
                     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);
-                        });
+                        t.executeSql(
+                            'INSERT OR REPLACE INTO ' +
+                            dbInfo.storeName +
+                            ' (key, value) VALUES (?, ?)',
+                            [key, value],
+                            function() {
+                                resolve(originalValue);
+                            }, function(t, error) {
+                                reject(error);
+                            });
                     }, function(sqlError) {
@@ -217,8 +214,3 @@ // The transaction failed; check
 
-    // Cast the key to a string, as that's all we can set as a key.
-    if (typeof key !== 'string') {
-        console.warn(key +
-                            ' used as a key, but it is not a string.');
-        key = String(key);
-    }
+    key = normalizeKey(key);
 
@@ -229,10 +221,10 @@ var promise = new Promise(function(resolve, reject) {
             dbInfo.db.transaction(function(t) {
-                t.executeSql('DELETE FROM ' + dbInfo.storeName +
-                             ' WHERE key = ?', [key],
-                             function() {
-                    resolve();
-                }, function(t, error) {
-
-                    reject(error);
-                });
+                t.executeSql(
+                    'DELETE FROM ' + dbInfo.storeName +
+                    ' WHERE key = ?', [key],
+                    function() {
+                        resolve();
+                    }, function(t, error) {
+                        reject(error);
+                    });
             });
@@ -255,8 +247,9 @@ }).catch(reject);
             dbInfo.db.transaction(function(t) {
-                t.executeSql('DELETE FROM ' + dbInfo.storeName, [],
-                             function() {
-                    resolve();
-                }, function(t, error) {
-                    reject(error);
-                });
+                t.executeSql(
+                    'DELETE FROM ' + dbInfo.storeName, [],
+                    function() {
+                        resolve();
+                    }, function(t, error) {
+                        reject(error);
+                    });
             });
@@ -280,11 +273,12 @@ }).catch(reject);
                 // 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;
+                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);
-                });
+                        resolve(result);
+                    }, function(t, error) {
+                        reject(error);
+                    });
             });
@@ -312,11 +306,12 @@ }).catch(reject);
             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);
-                });
+                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);
+                    });
             });
@@ -337,15 +332,15 @@ }).catch(reject);
             dbInfo.db.transaction(function(t) {
-                t.executeSql('SELECT key FROM ' + dbInfo.storeName, [],
-                             function(t, results) {
-                    var keys = [];
+                t.executeSql(
+                    '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);
-                    }
+                        for (var i = 0; i < results.rows.length; i++) {
+                            keys.push(results.rows.item(i).key);
+                        }
 
-                    resolve(keys);
-                }, function(t, error) {
-
-                    reject(error);
-                });
+                        resolve(keys);
+                    }, function(t, error) {
+                        reject(error);
+                    });
             });
@@ -362,2 +357,3 @@ }).catch(reject);
     _initStorage: _initStorage,
+    _support: isWebSQLValid(),
     iterate: iterate,
@@ -364,0 +360,0 @@ getItem: getItem,

src/localforage.js

@@ -1,4 +0,1 @@
-import isIndexedDBValid from './utils/isIndexedDBValid';
-import isWebSQLValid from './utils/isWebSQLValid';
-import isLocalStorageValid from './utils/isLocalStorageValid';
 import idbDriver from './drivers/indexeddb';
@@ -10,14 +7,23 @@ import websqlDriver from './drivers/websql';
 import executeTwoCallbacks from './utils/executeTwoCallbacks';
+import isArray from './utils/isArray';
 
-// Custom drivers are stored here when `defineDriver()` is called.
+// Drivers are stored here when `defineDriver()` is called.
 // They are shared across all instances of localForage.
-var CustomDrivers = {};
+const DefinedDrivers = {};
 
-var DriverType = {
-    INDEXEDDB: 'asyncStorage',
-    LOCALSTORAGE: 'localStorageWrapper',
-    WEBSQL: 'webSQLStorage'
+const DriverSupport = {};
+
+const DefaultDrivers = {
+    INDEXEDDB: idbDriver,
+    WEBSQL: websqlDriver,
+    LOCALSTORAGE: localstorageDriver
 };
 
-var DefaultDriverOrder = [
+const DriverType = {
+    INDEXEDDB: idbDriver._driver,
+    WEBSQL: websqlDriver._driver,
+    LOCALSTORAGE: localstorageDriver._driver
+};
+
+const DefaultDriverOrder = [
     DriverType.INDEXEDDB,
@@ -28,3 +34,3 @@ DriverType.WEBSQL,
 
-var LibraryMethods = [
+const LibraryMethods = [
     'clear',
@@ -40,3 +46,3 @@ 'getItem',
 
-var DefaultConfig = {
+const DefaultConfig = {
     description: '',
@@ -52,21 +58,5 @@ driver: DefaultDriverOrder.slice(),
 
-var driverSupport = {};
-// Check to see if IndexedDB is available and if it is the latest
-// implementation; it's our preferred backend library. We use "_spec_test"
-// as the name of the database because it's not the one we'll operate on,
-// but it's useful to make sure its using the right spec.
-// See: https://github.com/mozilla/localForage/issues/128
-driverSupport[DriverType.INDEXEDDB] = isIndexedDBValid();
-
-driverSupport[DriverType.WEBSQL] = isWebSQLValid();
-
-driverSupport[DriverType.LOCALSTORAGE] = isLocalStorageValid();
-
-var isArray = Array.isArray || function(arg) {
-        return Object.prototype.toString.call(arg) === '[object Array]';
-    };
-
 function callWhenReady(localForageInstance, libraryMethod) {
     localForageInstance[libraryMethod] = function() {
-        var _args = arguments;
+        const _args = arguments;
         return localForageInstance.ready().then(function() {
@@ -79,7 +69,7 @@ return localForageInstance[libraryMethod].apply(localForageInstance, _args);
 function extend() {
-    for (var i = 1; i < arguments.length; i++) {
-        var arg = arguments[i];
+    for (let i = 1; i < arguments.length; i++) {
+        const arg = arguments[i];
 
         if (arg) {
-            for (var key in arg) {
+            for (let key in arg) {
                 if (arg.hasOwnProperty(key)) {
@@ -99,19 +89,17 @@ if (isArray(arg[key])) {
 
-function isLibraryDriver(driverName) {
-    for (var driver in DriverType) {
-        if (DriverType.hasOwnProperty(driver) &&
-            DriverType[driver] === driverName) {
-            return true;
-        }
-    }
-
-    return false;
-}
-
 class LocalForage {
     constructor(options) {
-        this.INDEXEDDB = DriverType.INDEXEDDB;
-        this.LOCALSTORAGE = DriverType.LOCALSTORAGE;
-        this.WEBSQL = DriverType.WEBSQL;
+        for (let driverTypeKey in DriverType) {
+            if (DriverType.hasOwnProperty(driverTypeKey)) {
+                this[driverTypeKey] = DriverType[driverTypeKey];
 
+                if (!DefinedDrivers[driverTypeKey]) {
+                    // we don't need to wait for the promise,
+                    // since the default drivers can be defined
+                    // in a blocking manner
+                    this.defineDriver(DefaultDrivers[driverTypeKey]);
+                }
+            }
+        }
+
         this._defaultConfig = extend({}, DefaultConfig);
@@ -140,7 +128,7 @@ this._config = extend({}, this._defaultConfig, options);
             if (this._ready) {
-                return new Error("Can't call config() after localforage " +
+                return new Error('Can\'t call config() after localforage ' +
                     'has been used.');
             }
 
-            for (var i in options) {
+            for (let i in options) {
                 if (i === 'storeName') {
@@ -174,12 +162,9 @@ options[i] = options[i].replace(/\W/g, '_');
     defineDriver(driverObject, callback, errorCallback) {
-        var promise = new Promise(function(resolve, reject) {
+        const promise = new Promise(function(resolve, reject) {
             try {
-                var driverName = driverObject._driver;
-                var complianceError = new Error(
+                const driverName = driverObject._driver;
+                const complianceError = new Error(
                     'Custom driver not compliant; see ' +
                     'https://mozilla.github.io/localForage/#definedriver'
                 );
-                var namingError = new Error(
-                    'Custom driver name already in use: ' + driverObject._driver
-                );
 
@@ -192,10 +177,6 @@ // A driver name should be defined and not overlap with the
                 }
-                if (isLibraryDriver(driverObject._driver)) {
-                    reject(namingError);
-                    return;
-                }
 
-                var customDriverMethods = LibraryMethods.concat('_initStorage');
-                for (var i = 0; i < customDriverMethods.length; i++) {
-                    var customDriverMethod = customDriverMethods[i];
+                const driverMethods = LibraryMethods.concat('_initStorage');
+                for (let i = 0, len = driverMethods.length; i < len; i++) {
+                    const customDriverMethod = driverMethods[i];
                     if (!customDriverMethod || !driverObject[customDriverMethod] ||
@@ -208,16 +189,23 @@ typeof driverObject[customDriverMethod] !== 'function') {
 
-                var supportPromise = Promise.resolve(true);
+                const setDriverSupport = function(support) {
+                    if (DefinedDrivers[driverName]) {
+                        console.info(`Redefining LocalForage driver: ${driverName}`);
+                    }
+                    DefinedDrivers[driverName] = driverObject;
+                    DriverSupport[driverName] = support;
+                    // don't use a then, so that we can define
+                    // drivers that have simple _support methods
+                    // in a blocking manner
+                    resolve();
+                };
+
                 if ('_support' in driverObject) {
                     if (driverObject._support && typeof driverObject._support === 'function') {
-                        supportPromise = driverObject._support();
+                        driverObject._support().then(setDriverSupport, reject);
                     } else {
-                        supportPromise = Promise.resolve(!!driverObject._support);
+                        setDriverSupport(!!driverObject._support);
                     }
+                } else {
+                    setDriverSupport(true);
                 }
-
-                supportPromise.then(function(supportResult) {
-                    driverSupport[driverName] = supportResult;
-                    CustomDrivers[driverName] = driverObject;
-                    resolve();
-                }, reject);
             } catch (e) {
@@ -237,19 +225,6 @@ reject(e);
     getDriver(driverName, callback, errorCallback) {
-        var self = this;
-        var getDriverPromise = Promise.resolve().then(() => {
-            if (isLibraryDriver(driverName)) {
-                switch (driverName) {
-                    case self.INDEXEDDB:
-                        return idbDriver;
-                    case self.LOCALSTORAGE:
-                        return localstorageDriver;
-                    case self.WEBSQL:
-                        return websqlDriver;
-                }
-            } else if (CustomDrivers[driverName]) {
-                return CustomDrivers[driverName];
-            } else {
-                throw new Error('Driver not found.');
-            }
-        });
+        const getDriverPromise = DefinedDrivers[driverName] ?
+            Promise.resolve(DefinedDrivers[driverName]) :
+            Promise.reject(new Error('Driver not found.'));
+
         executeTwoCallbacks(getDriverPromise, callback, errorCallback);
@@ -260,3 +235,3 @@ return getDriverPromise;
     getSerializer(callback) {
-        var serializerPromise = Promise.resolve(serializer);
+        const serializerPromise = Promise.resolve(serializer);
         executeTwoCallbacks(serializerPromise, callback);
@@ -267,5 +242,5 @@ return serializerPromise;
     ready(callback) {
-        var self = this;
+        const self = this;
 
-        var promise = self._driverSet.then(() => {
+        const promise = self._driverSet.then(() => {
             if (self._ready === null) {
@@ -283,3 +258,3 @@ self._ready = self._initDriver();
     setDriver(drivers, callback, errorCallback) {
-        var self = this;
+        const self = this;
 
@@ -290,3 +265,3 @@ if (!isArray(drivers)) {
 
-        var supportedDrivers = this._getSupportedDrivers(drivers);
+        const supportedDrivers = this._getSupportedDrivers(drivers);
 
@@ -307,7 +282,7 @@ function setDriverToConfig() {
             return function() {
-                var currentDriverIndex = 0;
+                let currentDriverIndex = 0;
 
                 function driverPromiseLoop() {
                     while (currentDriverIndex < supportedDrivers.length) {
-                        var driverName = supportedDrivers[currentDriverIndex];
+                        let driverName = supportedDrivers[currentDriverIndex];
                         currentDriverIndex++;
@@ -324,3 +299,3 @@
                     setDriverToConfig();
-                    var error = new Error('No available storage method found.');
+                    const error = new Error('No available storage method found.');
                     self._driverSet = Promise.reject(error);
@@ -337,3 +312,3 @@ return self._driverSet;
         // race condition to set _dbInfo
-        var oldDriverSetDone = this._driverSet !== null ?
+        const oldDriverSetDone = this._driverSet !== null ?
             this._driverSet.catch(() => Promise.resolve()) :
@@ -343,3 +318,3 @@ Promise.resolve();
         this._driverSet = oldDriverSetDone.then(() => {
-            var driverName = supportedDrivers[0];
+            const driverName = supportedDrivers[0];
             self._dbInfo = null;
@@ -357,3 +332,3 @@ self._ready = null;
             setDriverToConfig();
-            var error = new Error('No available storage method found.');
+            const error = new Error('No available storage method found.');
             self._driverSet = Promise.reject(error);
@@ -368,3 +343,3 @@ return self._driverSet;
     supports(driverName) {
-        return !!driverSupport[driverName];
+        return !!DriverSupport[driverName];
     }
@@ -377,5 +352,5 @@
     _getSupportedDrivers(drivers) {
-        var supportedDrivers = [];
-        for (var i = 0, len = drivers.length; i < len; i++) {
-            var driverName = drivers[i];
+        const supportedDrivers = [];
+        for (let i = 0, len = drivers.length; i < len; i++) {
+            const driverName = drivers[i];
             if (this.supports(driverName)) {
@@ -393,3 +368,3 @@ supportedDrivers.push(driverName);
         // loaded, so there is no performance impact.
-        for (var i = 0; i < LibraryMethods.length; i++) {
+        for (let i = 0, len = LibraryMethods.length; i < len; i++) {
             callWhenReady(this, LibraryMethods[i]);
@@ -396,0 +371,0 @@ }

src/utils/idb.js

@@ -19,3 +19,5 @@ function getIDB() {
         }
-    } catch (e) { }
+    } catch (e) {
+        return;
+    }
 }
@@ -22,0 +24,0 @@

src/utils/isIndexedDBValid.js

@@ -28,2 +28,4 @@ import idb from './idb';
         // 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';
@@ -30,0 +32,0 @@ } catch (e) {

src/utils/isLocalStorageValid.js

@@ -5,3 +5,3 @@ function isLocalStorageValid() {
             ('setItem' in localStorage) &&
-            localStorage.setItem;
+            typeof localStorage.setItem === 'function';
     } catch (e) {
@@ -8,0 +8,0 @@ return false;

src/utils/serializer.js

@@ -0,1 +1,2 @@
+/* eslint-disable no-bitwise */
 import createBlob from './createBlob';
@@ -157,3 +158,3 @@
             console.error("Couldn't convert value into a JSON string: ",
-                value);
+                          value);
 
@@ -177,4 +178,3 @@ callback(null, e);
     // 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);
@@ -188,3 +188,3 @@ }
     var type = value.substring(SERIALIZED_MARKER_LENGTH,
-        TYPE_SERIALIZED_MARKER_LENGTH);
+                               TYPE_SERIALIZED_MARKER_LENGTH);
 
@@ -191,0 +191,0 @@ var blobType;

test/runner.js

@@ -0,1 +1,2 @@
+/* global requirejs:true */
 // Run before window.onload to make sure the specs have access to describe()
@@ -10,3 +11,3 @@ // and other mocha methods. All feels very hacky though :-/
 
-    runner.on('end', function(){
+    runner.on('end', function() {
         window.mochaResults = runner.stats;
@@ -42,4 +43,4 @@ window.mochaResults.reports = failedTests;
     Array.prototype.forEach = function(callback, thisArg) {
-        if (typeof(callback) !== "function") {
-            throw new TypeError(callback + " is not a function!");
+        if (typeof(callback) !== 'function') {
+            throw new TypeError(callback + ' is not a function!');
         }
@@ -46,0 +47,0 @@ var len = this.length;

test/test.api.js

@@ -267,2 +267,79 @@ /* global after:true, afterEach:true, before:true, beforeEach:true, describe:true, expect:true, it:true, Promise:true */
             });
+
+            describe('recover (reconnect) from IDBDatabase InvalidStateError', function() {
+
+                beforeEach(function(done) {
+                    Promise.all([
+                        localforage.setItem('key', 'value1'),
+                        localforage.setItem('key1', 'value1'),
+                        localforage.setItem('key2', 'value2'),
+                        localforage.setItem('key3', 'value3')
+                    ]).then(function() {
+                        localforage._dbInfo.db.close();
+                        done();
+                    }, function(error) {
+                        done(error || 'error');
+                    });
+                });
+
+                it('retrieves an item from the storage', function(done) {
+                    localforage.getItem('key').then(function(value) {
+                        expect(value).to.be('value1');
+                        done();
+                    }, function(error) {
+                        done(error || 'error');
+                    });
+                });
+
+                it('retrieves more than one items from the storage', function(done) {
+                    Promise.all([
+                        localforage.getItem('key1'),
+                        localforage.getItem('key2'),
+                        localforage.getItem('key3')
+                    ]).then(function(values) {
+                        expect(values).to.eql([
+                            'value1',
+                            'value2',
+                            'value3'
+                        ]);
+                        done();
+                    }, function(error) {
+                        done(error || 'error');
+                    });
+                });
+
+                it('stores and retrieves an item from the storage', function(done) {
+                    localforage.setItem('key', 'value1b').then(function() {
+                        return localforage.getItem('key');
+                    }).then(function(value) {
+                        expect(value).to.be('value1b');
+                        done();
+                    }, function(error) {
+                        done(error || 'error');
+                    });
+                });
+
+                it('stores and retrieves more than one items from the storage', function(done) {
+                    Promise.all([
+                        localforage.setItem('key1', 'value1b'),
+                        localforage.setItem('key2', 'value2b'),
+                        localforage.setItem('key3', 'value3b')
+                    ]).then(function() {
+                        return Promise.all([
+                            localforage.getItem('key1'),
+                            localforage.getItem('key2'),
+                            localforage.getItem('key3')
+                        ]);
+                    }).then(function(values) {
+                        expect(values).to.eql([
+                            'value1b',
+                            'value2b',
+                            'value3b'
+                        ]);
+                        done();
+                    }, function(error) {
+                        done(error || 'error');
+                    });
+                });
+            });
         }
@@ -329,4 +406,3 @@
 
-                    localforage.setItem('officeY', 'InitechY',
-                                        function(err, setValue) {
+                    localforage.setItem('officeY', 'InitechY', function(err, setValue) {
                         expect(setValue).to.be('InitechY');
@@ -389,4 +465,3 @@
 
-        it('should break iteration with defined return value [callback]',
-           function(done) {
+        it('should break iteration with defined return value [callback]', function(done) {
             var breakCondition = 'Some value!';
@@ -400,4 +475,3 @@
 
-                    localforage.setItem('officeY', 'InitechY',
-                                        function(err, setValue) {
+                    localforage.setItem('officeY', 'InitechY', function(err, setValue) {
                         expect(setValue).to.be('InitechY');
@@ -425,4 +499,3 @@
 
-        it('should break iteration with defined return value [promise]',
-           function(done) {
+        it('should break iteration with defined return value [promise]', function(done) {
             var breakCondition = 'Some value!';
@@ -546,8 +619,6 @@
         it('saves an item over an existing key [callback]', function(done) {
-            localforage.setItem('4th floor', 'Mozilla',
-                                function(err, setValue) {
+            localforage.setItem('4th floor', 'Mozilla', function(err, setValue) {
                 expect(setValue).to.be('Mozilla');
 
-                localforage.setItem('4th floor', 'Quora',
-                                    function(err, newValue) {
+                localforage.setItem('4th floor', 'Quora', function(err, newValue) {
                     expect(newValue).to.not.be(setValue);
@@ -659,8 +730,6 @@ expect(newValue).to.be('Quora');
                     localforage.removeItem('office', function() {
-                        localforage.getItem('office',
-                                            function(err, emptyValue) {
+                        localforage.getItem('office', function(err, emptyValue) {
                             expect(emptyValue).to.be(null);
 
-                            localforage.getItem('otherOffice',
-                                                function(err, value) {
+                            localforage.getItem('otherOffice', function(err, value) {
                                 expect(value).to.be('Initrode');
@@ -898,2 +967,3 @@
             return new Promise(function(resolve) {
+                // eslint-disable-next-line no-use-before-define
                 var indexedDB = (indexedDB || window.indexedDB ||
@@ -1024,25 +1094,151 @@ window.webkitIndexedDB ||
 
-        it('chains operation on multiple stores', function(done) {
+        before(function() {
+            return Promise.all([
+                prepareStorage('storage3'),
+                prepareStorage('commonStorage'),
+                prepareStorage('commonStorage2'),
+                prepareStorage('commonStorage3')
+            ]);
+        });
 
-            prepareStorage('storage3').then(function() {
-                var localforage1 = localforage.createInstance({
-                    name: 'storage3',
-                    storeName: 'store1',
+        it('chains operation on multiple stores', function() {
+            var localforage1 = localforage.createInstance({
+                name: 'storage3',
+                storeName: 'store1',
+                size: 1024
+            });
+
+            var localforage2 = localforage.createInstance({
+                name: 'storage3',
+                storeName: 'store2',
+                size: 1024
+            });
+
+            var localforage3 = localforage.createInstance({
+                name: 'storage3',
+                storeName: 'store3',
+                size: 1024
+            });
+
+            var promise1 = localforage1.setItem('key', 'value1').then(function() {
+                return localforage1.getItem('key');
+            }).then(function(value) {
+                expect(value).to.be('value1');
+            });
+
+            var promise2 = localforage2.setItem('key', 'value2').then(function() {
+                return localforage2.getItem('key');
+            }).then(function(value) {
+                expect(value).to.be('value2');
+            });
+
+            var promise3 = localforage3.setItem('key', 'value3').then(function() {
+                return localforage3.getItem('key');
+            }).then(function(value) {
+                expect(value).to.be('value3');
+            });
+
+            return Promise.all([
+                promise1,
+                promise2,
+                promise3
+            ]);
+        });
+
+        it('can create multiple instances of the same store', function() {
+            var localforage1;
+            var localforage2;
+            var localforage3;
+
+            Promise.resolve()
+            .then(function() {
+                localforage1 = localforage.createInstance({
+                    name: 'commonStorage',
+                    storeName: 'commonStore',
                     size: 1024
                 });
-
-                var localforage2 = localforage.createInstance({
-                    name: 'storage3',
-                    storeName: 'store2',
+                return localforage1.ready();
+            })
+            .then(function() {
+                localforage2 = localforage.createInstance({
+                    name: 'commonStorage',
+                    storeName: 'commonStore',
                     size: 1024
                 });
+                return localforage2.ready();
+            })
+            .then(function() {
+                localforage3 = localforage.createInstance({
+                    name: 'commonStorage',
+                    storeName: 'commonStore',
+                    size: 1024
+                });
+                return localforage3.ready();
+            }).then(function() {
+                return Promise.resolve()
+                .then(function() {
+                    return localforage1.setItem('key1', 'value1').then(function() {
+                        return localforage1.getItem('key1');
+                    }).then(function(value) {
+                        expect(value).to.be('value1');
+                    });
+                })
+                .then(function() {
+                    return localforage2.setItem('key2', 'value2').then(function() {
+                        return localforage2.getItem('key2');
+                    }).then(function(value) {
+                        expect(value).to.be('value2');
+                    });
+                })
+                .then(function() {
+                    return localforage3.setItem('key3', 'value3').then(function() {
+                        return localforage3.getItem('key3');
+                    }).then(function(value) {
+                        expect(value).to.be('value3');
+                    });
+                });
+            });
+        });
 
-                var localforage3 = localforage.createInstance({
-                    name: 'storage3',
-                    storeName: 'store3',
+        it('can create multiple instances of the same store and do concurrent operations', function() {
+            var localforage1;
+            var localforage2;
+            var localforage3;
+            var localforage3b;
+
+            Promise.resolve()
+            .then(function() {
+                localforage1 = localforage.createInstance({
+                    name: 'commonStorage2',
+                    storeName: 'commonStore',
                     size: 1024
                 });
-
-                var promise1 = localforage1.setItem('key', 'value1').then(function() {
-                    return localforage1.getItem('key');
+                return localforage1.ready();
+            })
+            .then(function() {
+                localforage2 = localforage.createInstance({
+                    name: 'commonStorage2',
+                    storeName: 'commonStore',
+                    size: 1024
+                });
+                return localforage2.ready();
+            })
+            .then(function() {
+                localforage3 = localforage.createInstance({
+                    name: 'commonStorage2',
+                    storeName: 'commonStore',
+                    size: 1024
+                });
+                return localforage3.ready();
+            })
+            .then(function() {
+                localforage3b = localforage.createInstance({
+                    name: 'commonStorage2',
+                    storeName: 'commonStore',
+                    size: 1024
+                });
+                return localforage3b.ready();
+            }).then(function() {
+                var promise1 = localforage1.setItem('key1', 'value1').then(function() {
+                    return localforage1.getItem('key1');
                 }).then(function(value) {
@@ -1052,4 +1248,4 @@ expect(value).to.be('value1');
 
-                var promise2 = localforage2.setItem('key', 'value2').then(function() {
-                    return localforage2.getItem('key');
+                var promise2 = localforage2.setItem('key2', 'value2').then(function() {
+                    return localforage2.getItem('key2');
                 }).then(function(value) {
@@ -1059,4 +1255,4 @@ expect(value).to.be('value2');
 
-                var promise3 = localforage3.setItem('key', 'value3').then(function() {
-                    return localforage3.getItem('key');
+                var promise3 = localforage3.setItem('key3', 'value3').then(function() {
+                    return localforage3.getItem('key3');
                 }).then(function(value) {
@@ -1066,13 +1262,73 @@ expect(value).to.be('value3');
 
-                Promise.all([
+                var promise4 = localforage3b.setItem('key3', 'value3').then(function() {
+                    return localforage3.getItem('key3');
+                }).then(function(value) {
+                    expect(value).to.be('value3');
+                });
+
+                return Promise.all([
                     promise1,
                     promise2,
-                    promise3
-                ]).then(function() {
-                    done();
-                }).catch(function(errors) {
-                    done(new Error(errors));
-                });
+                    promise3,
+                    promise4
+                ]);
             });
         });
+
+        it('can create multiple instances of the same store concurrently', function() {
+            var localforage1 = localforage.createInstance({
+                name: 'commonStorage3',
+                storeName: 'commonStore',
+                size: 1024
+            });
+
+            var localforage2 = localforage.createInstance({
+                name: 'commonStorage3',
+                storeName: 'commonStore',
+                size: 1024
+            });
+
+            var localforage3 = localforage.createInstance({
+                name: 'commonStorage3',
+                storeName: 'commonStore',
+                size: 1024
+            });
+
+            var localforage3b = localforage.createInstance({
+                name: 'commonStorage3',
+                storeName: 'commonStore',
+                size: 1024
+            });
+
+            var promise1 = localforage1.setItem('key1', 'value1').then(function() {
+                return localforage1.getItem('key1');
+            }).then(function(value) {
+                expect(value).to.be('value1');
+            });
+
+            var promise2 = localforage2.setItem('key2', 'value2').then(function() {
+                return localforage2.getItem('key2');
+            }).then(function(value) {
+                expect(value).to.be('value2');
+            });
+
+            var promise3 = localforage3.setItem('key3', 'value3').then(function() {
+                return localforage3.getItem('key3');
+            }).then(function(value) {
+                expect(value).to.be('value3');
+            });
+
+            var promise4 = localforage3b.setItem('key3', 'value3').then(function() {
+                return localforage3.getItem('key3');
+            }).then(function(value) {
+                expect(value).to.be('value3');
+            });
+
+            return Promise.all([
+                promise1,
+                promise2,
+                promise3,
+                promise4
+            ]);
+        });
     });
@@ -1079,0 +1335,0 @@

test/test.config.js

@@ -203,4 +203,3 @@ /* global before:true, beforeEach:true, describe:true, expect:true, it:true */
                     t.executeSql('SELECT * FROM myStoreName WHERE key = ? ' +
-                                 'LIMIT 1', ['some key'],
-                                 function(t, results) {
+                                 'LIMIT 1', ['some key'], function(t, results) {
                         var dbValue = JSON.parse(results.rows.item(0).value);
@@ -214,3 +213,3 @@
                 var dbValue = JSON.parse(
-                  localStorage['My Cool App/myStoreName/some key']);
+                    localStorage['My Cool App/myStoreName/some key']);
 
@@ -217,0 +216,0 @@ expect(dbValue).to.be(value);

test/test.customdriver.js

@@ -6,5 +6,2 @@ /* global describe:true, expect:true, it:true, dummyStorageDriver:true */
                        'https://mozilla.github.io/localForage/#definedriver';
-    var nameErrorMessage = function(driverName) {
-        return 'Custom driver name already in use: ' + driverName;
-    };
 
@@ -47,42 +44,2 @@ it('fails to define a no-name custom driver', function(done) {
 
-    it('fails to define a custom driver with overlapping driver name',
-       function(done) {
-        localforage.defineDriver({
-            _driver: localforage.INDEXEDDB,
-            _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(nameErrorMessage(localforage.INDEXEDDB));
-            done();
-        });
-    });
-
-    it('fails to define a custom driver with overlapping driver name [promise]',
-       function(done) {
-        localforage.defineDriver({
-            _driver: localforage.INDEXEDDB,
-            _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(nameErrorMessage(localforage.INDEXEDDB));
-            done();
-        });
-    });
-
     it('fails to define a custom driver with missing methods', function(done) {
@@ -104,4 +61,3 @@ localforage.defineDriver({
 
-    it('fails to define a custom driver with missing methods [promise]',
-       function(done) {
+    it('fails to define a custom driver with missing methods [promise]', function(done) {
         localforage.defineDriver({
@@ -152,2 +108,71 @@ _driver: 'missingMethodsDriver',
 
+    it('defines a driver synchronously when it doesn\'t have _supports()', function(done) {
+        var customDriver = {
+            _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() { }
+        };
+
+        localforage.defineDriver(customDriver);
+        localforage.setDriver(customDriver._driver).then(function() {
+            expect(localforage.driver()).to.be(customDriver._driver);
+            done();
+        });
+    });
+
+    it('defines a driver synchronously when it has boolean _supports()', function(done) {
+        var customDriver = {
+            _driver: 'dummyStorageDriver' + (+new Date()),
+            _initStorage: function() { },
+            _support: true,
+            iterate: function() { },
+            getItem: function() { },
+            setItem: function() { },
+            removeItem: function() { },
+            clear: function() { },
+            length: function() { },
+            key: function() { },
+            keys: function() { }
+        };
+
+        localforage.defineDriver(customDriver);
+        localforage.setDriver(customDriver._driver).then(function() {
+            expect(localforage.driver()).to.be(customDriver._driver);
+            done();
+        });
+    });
+
+    it('defines a driver asynchronously when _supports() returns a Promise<boolean>', 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() {
+            expect(localforage.driver()).to.be(customDriver._driver);
+            done();
+        });
+    });
+
     it('sets and uses a custom driver', function(done) {
@@ -157,7 +182,5 @@ localforage.defineDriver(dummyStorageDriver, function() {
                 expect(err).to.be(undefined);
-                localforage.setItem('testCallbackKey', 'testCallbackValue',
-                                    function(err) {
+                localforage.setItem('testCallbackKey', 'testCallbackValue', function(err) {
                     expect(err).to.be(null);
-                    localforage.getItem('testCallbackKey',
-                                        function(err, value) {
+                    localforage.getItem('testCallbackKey', function(err, value) {
                         expect(err).to.be(null);
@@ -164,0 +187,0 @@ expect(value).to.be('testCallbackValue');

test/test.datatypes.js

@@ -16,4 +16,4 @@ /* global before:true, beforeEach:true, describe:true, expect:true, it:true */
             typeof MSBlobBuilder !== 'undefined' ? MSBlobBuilder :
-                typeof MozBlobBuilder !== 'undefined' ? MozBlobBuilder :
-                    WebKitBlobBuilder;
+            typeof MozBlobBuilder !== 'undefined' ? MozBlobBuilder :
+            WebKitBlobBuilder;
         var builder = new Builder();
@@ -336,4 +336,4 @@ for (var i = 0; i < parts.length; i += 1) {
             it('saves binary (Blob) data', function(done) {
-                var fileParts = ['<a id=\"a\"><b id=\"b\">hey!<\/b><\/a>'];
-                var mimeString = 'text\/html';
+                var fileParts = ['<a id="a"><b id="b">hey!</b></a>'];
+                var mimeString = 'text/html';
 
@@ -369,4 +369,4 @@ var testBlob = createBlob(fileParts, { 'type' : mimeString });
             it('saves binary (Blob) data, iterate back', function(done) {
-                var fileParts = ['<a id=\"a\"><b id=\"b\">hey!<\/b><\/a>'];
-                var mimeString = 'text\/html';
+                var fileParts = ['<a id="a"><b id="b">hey!</b></a>'];
+                var mimeString = 'text/html';
 
@@ -373,0 +373,0 @@ var testBlob = createBlob(fileParts, { 'type' : mimeString });

test/test.drivers.js

@@ -63,4 +63,4 @@ /* global beforeEach:true, describe:true, expect:true, it:true */
             // TODO: Look into why.
-            localforage.setDriver(localforage.INDEXEDDB).then(null,
-                                                              function() {
+            localforage.setDriver(localforage.INDEXEDDB)
+            .then(null, function() {
                 expect(localforage.driver()).to.be(previousDriver);
@@ -105,4 +105,4 @@ done();
 
-            localforage.setDriver(localforage.LOCALSTORAGE).then(null,
-                                                              function() {
+            localforage.setDriver(localforage.LOCALSTORAGE)
+            .then(null, function() {
                 expect(localforage.driver()).to.be(previousDriver);
@@ -148,4 +148,4 @@ done();
 
-            localforage.setDriver(localforage.WEBSQL).then(null,
-                                                              function() {
+            localforage.setDriver(localforage.WEBSQL)
+            .then(null, function() {
                 expect(localforage.driver()).to.be(previousDriver);
@@ -152,0 +152,0 @@ done();

typing-tests/localforage-tests.ts

@@ -18,2 +18,20 @@ /// <reference path="../typings/localforage.d.ts" />
 
+    localForage.iterate((value, key: string, num: number) => {
+        let newStr: any = value;
+        let newKey: string = key;
+        let newNum: number = num;
+    });
+
+    localForage.iterate((value: any, key: string, num: number) => {
+        let newStr: any = value;
+        let newKey: string = key;
+        let newNum: number = num;
+    });
+
+    localForage.iterate<any, void>((value: any, key: string, num: number) => {
+        let newStr: any = value;
+        let newKey: string = key;
+        let newNum: number = num;
+    });
+
     localForage.iterate((str: string, key: string, num: number) => {
@@ -25,2 +43,41 @@ let newStr: string = str;
 
+    localForage.iterate((str: string, key: string, num: number) => {
+        let newStr: string = str;
+        let newKey: string = key;
+        let newNum: number = num;
+        if (newStr === 'END') {
+            return newNum;
+        }
+    }).then((result: number | undefined) => {
+        if (result) {
+            let numResult: number = result;
+        }
+    });
+
+    localForage.iterate<string, number | void>((str, key: string, num: number) => {
+        let newStr: string = str;
+        let newKey: string = key;
+        let newNum: number = num;
+        if (newStr === 'END') {
+            return newNum;
+        }
+    }).then((result: number | void) => {
+        if (result) {
+            let numResult: number = result;
+        }
+    });
+
+    localForage.iterate<string, number | void>((str: string, key: string, num: number) => {
+        let newStr: string = str;
+        let newKey: string = key;
+        let newNum: number = num;
+        if (newStr === 'END') {
+            return newNum;
+        }
+    }).then((result: number | void) => {
+        if (result) {
+            let numResult: number = result;
+        }
+    });
+
     localForage.length((err: any, num: number) => {
@@ -27,0 +84,0 @@ let newError: any = err;

typings/localforage.d.ts

@@ -38,5 +38,5 @@
 
-    iterate(iteratee: (value: any, key: string, iterationNumber: number) => any): Promise<any>;
-    iterate(iteratee: (value: any, key: string, iterationNumber: number) => any,
-            callback: (err: any, result: any) => void): void;
+    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;
 }
@@ -43,0 +43,0 @@

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License

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Found 1 instance in 1 package

Fixed alerts

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

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Improved metrics

Number of package files

87

increased by1.16%

Lines of code

13269

increased by2.26%

Number of lines in readme file

266

increased by0.76%

Worsened metrics

Total package byte prevSize

871261

decreased by-7.36%

No dependency changes