localforage - npm Package Compare versions

Comparing version 1.4.0 to 1.4.1

bower.json

@@ -28,3 +28,3 @@ {
   },
-  "version": "1.4.0"
+  "version": "1.4.1"
 }

component.json

 {
   "name": "localforage",
-  "version": "1.4.0",
+  "version": "1.4.1",
   "dependencies": {
@@ -5,0 +5,0 @@ "then/promise": "5.0.0"

dist/localforage.min.js

 /*!
     localForage -- Offline Storage, Improved
-    Version 1.4.0
+    Version 1.4.1
     https://mozilla.github.io/localForage
     (c) 2013-2015 Mozilla, Apache License 2.0
 */
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b)b.hasOwnProperty(c)&&(La(b[c])?arguments[0][c]=b[c].slice():arguments[0][c]=b[c])}return arguments[0]}function da(a){for(var b in Ga)if(Ga.hasOwnProperty(b)&&Ga[b]===a)return!0;return!1}var ea="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(a){return typeof a}:function(a){return a&&"function"==typeof Symbol&&a.constructor===Symbol?"symbol":typeof a},fa=e();a("lie/polyfill");var ga,ha,ia=Promise,ja="local-forage-detect-blob-support",ka={_driver:"asyncStorage",_initStorage:x,iterate:z,getItem:y,setItem:A,removeItem:B,clear:C,length:D,key:E,keys:F},la="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",ma="~~local_forage_type~",na=/^~~local_forage_type~([^~]+)~/,oa="__lfsc__:",pa=oa.length,qa="arbf",ra="blob",sa="si08",ta="ui08",ua="uic8",va="si16",wa="si32",xa="ur16",ya="ui32",za="fl32",Aa="fl64",Ba=pa+qa.length,Ca={serialize:I,deserialize:J,stringToBuffer:G,bufferToString:H},Da={_driver:"webSQLStorage",_initStorage:K,iterate:M,getItem:L,setItem:N,removeItem:O,clear:P,length:Q,key:R,keys:S},Ea={_driver:"localStorageWrapper",_initStorage:T,iterate:W,getItem:V,setItem:_,removeItem:$,clear:U,length:Z,key:X,keys:Y},Fa={},Ga={INDEXEDDB:"asyncStorage",LOCALSTORAGE:"localStorageWrapper",WEBSQL:"webSQLStorage"},Ha=[Ga.INDEXEDDB,Ga.WEBSQL,Ga.LOCALSTORAGE],Ia=["clear","getItem","iterate","key","keys","length","removeItem","setItem"],Ja={description:"",driver:Ha.slice(),name:"localforage",size:4980736,storeName:"keyvaluepairs",version:1},Ka={};Ka[Ga.INDEXEDDB]=f(),Ka[Ga.WEBSQL]=g(),Ka[Ga.LOCALSTORAGE]=h();var La=Array.isArray||function(a){return"[object Array]"===Object.prototype.toString.call(a)},Ma=function(){function a(b){d(this,a),this.INDEXEDDB=Ga.INDEXEDDB,this.LOCALSTORAGE=Ga.LOCALSTORAGE,this.WEBSQL=Ga.WEBSQL,this._defaultConfig=ca({},Ja),this._config=ca({},this._defaultConfig,b),this._driverSet=null,this._initDriver=null,this._ready=!1,this._dbInfo=null,this._wrapLibraryMethodsWithReady(),this.setDriver(this._config.driver)}return a.prototype.config=function(a){if("object"===("undefined"==typeof a?"undefined":ea(a))){if(this._ready)return new Error("Can't call config() after localforage has been used.");for(var b in a)"storeName"===b&&(a[b]=a[b].replace(/\W/g,"_")),this._config[b]=a[b];return"driver"in a&&a.driver&&this.setDriver(this._config.driver),!0}return"string"==typeof a?this._config[a]:this._config},a.prototype.defineDriver=function(a,b,c){var d=new ia(function(b,c){try{var d=a._driver,e=new Error("Custom driver not compliant; see 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Gruntfile.js

@@ -37,3 +37,4 @@ /* jshint node:true */
             options: {
-                modules: 'umd',
+                babelrc: false,
+                extends: path.resolve('.babelrc-umd'),
                 moduleIds: true,
@@ -56,4 +57,43 @@ getModuleId: babelModuleIdProvider
                 dest: 'test/localforage.browserify.js'
+            },
+            main: {
+                files: {
+                    'dist/localforage.js': 'src/localforage.js'
+                },
+                options: {
+                    browserifyOptions: {
+                        standalone: 'localforage'
+                    },
+                    transform: ['rollupify', 'babelify'],
+                    plugin: ['bundle-collapser/plugin']
+                }
+            },
+            no_promises: {
+                files: {
+                    'dist/localforage.nopromises.js': 'src/localforage.js'
+                },
+                options: {
+                    browserifyOptions: {
+                        standalone: 'localforage'
+                    },
+                    transform: ['rollupify', 'babelify'],
+                    plugin: ['bundle-collapser/plugin'],
+                    exclude: ['lie/polyfill']
+                }
             }
         },
+        run: {
+            derequire: {
+                exec: 'derequire ' +
+                  '< dist/localforage.js > dist/localforage.tmp ' +
+                  '&& ncp dist/localforage.tmp dist/localforage.js' +
+                  '&& rimraf dist/localforage.tmp'
+            },
+            derequire_no_promises: {
+                exec: 'derequire ' +
+                '< dist/localforage.nopromises.js > dist/localforage.nopromises.tmp ' +
+                '&& ncp dist/localforage.nopromises.tmp dist/localforage.nopromises.js' +
+                '&& rimraf dist/localforage.nopromises.tmp'
+            }
+        },
         concat: {
@@ -64,10 +104,9 @@ options: {
             localforage: {
+                // just to add the BANNER
+                // without adding an extra grunt module
                 files: {
                     'dist/localforage.js': [
-                        'bower_components/es6-promise/promise.js',
-                        'dist/localforage.nopromises.js'
+                        'dist/localforage.js'
                     ],
                     'dist/localforage.nopromises.js': [
-                        // just to add the BANNER
-                        // without adding an extra grunt module
                         'dist/localforage.nopromises.js'
@@ -130,13 +169,11 @@ ]
                     urls: [
-                        'http://localhost:9999/test/test.component.html',
-                        'http://localhost:9999/test/test.nodriver.html',
-                        'http://localhost:9999/test/test.faultydriver.html',
                         'http://localhost:9999/test/test.main.html',
                         'http://localhost:9999/test/test.min.html',
+                        'http://localhost:9999/test/test.callwhenready.html',
+                        'http://localhost:9999/test/test.customdriver.html',
+                        'http://localhost:9999/test/test.faultydriver.html',
+                        'http://localhost:9999/test/test.nodriver.html',
+                        'http://localhost:9999/test/test.browserify.html',
                         'http://localhost:9999/test/test.require.html',
-                        'http://localhost:9999/test/test.require.unbundled.html',
-                        'http://localhost:9999/test/test.browserify.html',
-                        'http://localhost:9999/test/test.webpack.html',
-                        'http://localhost:9999/test/test.callwhenready.html',
-                        'http://localhost:9999/test/test.customdriver.html'
+                        'http://localhost:9999/test/test.webpack.html'
                     ]
@@ -146,7 +183,2 @@ }
         },
-        open: {
-            site: {
-                path: 'http://localhost:4567/'
-            }
-        },
         'saucelabs-mocha': {
@@ -166,18 +198,2 @@ all: {
         },
-        shell: {
-            options: {
-                stdout: true
-            },
-            component: {
-                command: path.resolve('node_modules', 'component', 'bin',
-                                      'component-build') +
-                         ' --dev -o test -n localforage.component'
-            },
-            'publish-site': {
-                command: 'rake publish ALLOW_DIRTY=true'
-            },
-            'serve-site': {
-                command: 'bundle exec middleman server'
-            }
-        },
         uglify: {
@@ -189,4 +205,3 @@ localforage: {
                         'dist/localforage.nopromises.js'
-                    ],
-                    'site/localforage.min.js': ['dist/localforage.js']
+                    ]
                 },
@@ -213,3 +228,2 @@ options: {
                     'jscs',
-                    'shell:component',
                     'browserify:package_bundling_test',
@@ -228,18 +242,2 @@ 'webpack:package_bundling_test',
                 }
-            },
-            localforage_nopromises: {
-                entry: './src/localforage.js',
-                output: {
-                    path: 'dist/',
-                    filename: 'localforage.nopromises.js',
-                    library: ['localforage'],
-                    libraryTarget: 'umd'
-                },
-                module: {
-                    loaders: [{
-                        test: /\.js?$/,
-                        exclude: /(node_modules|bower_components)/,
-                        loader: 'babel'
-                    }]
-                }
             }
@@ -252,6 +250,6 @@ }
     grunt.registerTask('default', ['build', 'connect', 'watch']);
-    grunt.registerTask('build', ['webpack:localforage_nopromises', 'concat', 'es3_safe_recast', 'uglify']);
-    grunt.registerTask('publish', ['build', 'shell:publish-site']);
+    grunt.registerTask('build', ['browserify:main', 'browserify:no_promises',
+        'run:derequire', 'run:derequire_no_promises',
+        'concat', 'es3_safe_recast', 'uglify']);
     grunt.registerTask('serve', ['build', 'connect:test', 'watch']);
-    grunt.registerTask('site', ['shell:serve-site']);
 
@@ -264,3 +262,2 @@ // These are the test tasks we run regardless of Sauce Labs credentials.
         'jscs',
-        'shell:component',
         'browserify:package_bundling_test',
@@ -267,0 +264,0 @@ 'webpack:package_bundling_test',

package.json

@@ -12,3 +12,3 @@ {
   ],
-  "version": "1.4.0",
+  "version": "1.4.1",
   "homepage": "https://github.com/mozilla/localForage",
@@ -20,13 +20,18 @@ "repository": {
   "scripts": {
+    "publish-docs": "node -e \"require('grunt').cli()\" null copy build-rules-html publish-rules",
     "test": "node -e \"require('grunt').cli()\" null test"
   },
   "devDependencies": {
-    "babel-core": "^5.8.22",
-    "babel-loader": "^5.3.2",
-    "babel-plugin-system-import-transformer": "^1.1.4",
-    "babelify": "^6.1.2",
-    "component": "^1.0.0-rc7",
+    "babel-core": "^6.5.1",
+    "babel-loader": "^6.2.2",
+    "babel-plugin-add-module-exports": "^0.1.2",
+    "babel-plugin-transform-es2015-modules-umd": "^6.5.0",
+    "babel-preset-es2015": "^6.6.0",
+    "babel-preset-es2015-loose": "^7.0.0",
+    "babelify": "^7.2.0",
+    "bundle-collapser": "^1.2.1",
     "cors": "^2.3.1",
+    "derequire": "^2.0.3",
     "grunt": "^0.4.2",
-    "grunt-babel": "^5.0.0",
+    "grunt-babel": "^6.0.0",
     "grunt-browserify": "^3.8.0",
@@ -41,11 +46,15 @@ "grunt-contrib-concat": "^0.3.0",
     "grunt-mocha": "^0.4.10",
+    "grunt-rollup": "^0.6.2",
+    "grunt-run": "^0.5.2",
     "grunt-saucelabs": "^5.1.2",
-    "grunt-shell": "^0.6.4",
     "grunt-webpack": "^1.0.11",
     "load-grunt-tasks": "^0.4.0",
     "mocha": "^1.18.2",
+    "ncp": "^2.0.0",
     "phantomjs": "^1.9.7-12",
+    "rimraf": "^2.5.2",
+    "rollupify": "^0.1.0",
     "script-loader": "^0.6.1",
     "uglify-js": "^2.3.x",
-    "webpack": "^1.11.0",
+    "webpack": "^1.12.13",
     "webpack-dev-server": "^1.10.1"
@@ -58,4 +67,4 @@ },
   "dependencies": {
-    "promise": "^5.0.0"
+    "lie": "3.0.2"
   }
 }

README.md

@@ -51,3 +51,3 @@ # localForage [![Build Status](https://travis-ci.org/mozilla/localForage.svg?branch=master)](http://travis-ci.org/mozilla/localForage)
 
-## Callbacks
+## Callbacks vs Promises
 
@@ -58,38 +58,32 @@ Because localForage uses async storage, it has an async API.
 
-```javascript
-// In localStorage, we would do:
-var obj = { value: "hello world" };
-localStorage.setItem('key', JSON.stringify(obj));
-alert(obj.value);
+localForage has a dual API that allows you to either use Node-style callbacks 
+or [Promises](https://www.promisejs.org/). If you are unsure which one is right for you, it's recommend to use Promises.
 
-// With localForage, we use callbacks:
-localforage.setItem('key', obj, function(err, result) { alert(result.value); });
-```
+Here's an example of the Node-style callback form:
 
-Similarly, please don't expect a return value from calls to
-`localforage.getItem()`. Instead, use a callback:
-
-```javascript
-// Synchronous; slower!
-var value = JSON.parse(localStorage.getItem('key'));
-alert(value);
-
-// Async, fast, and non-blocking!
-localforage.getItem('key', function(err, value) { alert(value) });
+```js
+localforage.setItem('key', 'value', function (err) {
+  // if err is non-null, we got an error
+  localforage.getItem('key', function (err, value) {
+    // if err is non-null, we got an error. otherwise, value is the value 
+  });
+});
 ```
 
-Callbacks in localForage are Node-style (error argument first) since version
-`0.9.3`. This means if you're using callbacks, your code should look like this:
+And the Promise form:
 
-```javascript
-// Use err as your first argument.
-localforage.getItem('key', function(err, value) {
-    if (err) {
-        console.error('Oh noes!');
-    } else {
-        alert(value);
-    }
+```js
+localforage.setItem('key', 'value').then(function () {
+  return localforage.getItem('key');
+}).then(function (value) {
+  // we got our value
+}).catch(function (err) {
+  // we got an error
 });
 ```
 
+For more examples, please visit [the API docs](http://mozilla.github.io/localForage). 
+
+## Storing Blobs, TypedArrays, and other JS objects
+
 You can store any type in localForage; you aren't limited to strings like in
@@ -100,34 +94,2 @@ localStorage. Even if localStorage is your storage backend, localForage
 
-## Promises
-
-Promises are pretty cool! If you'd rather use promises than callbacks,
-localForage supports that too:
-
-```javascript
-function doSomethingElse(value) {
-    console.log(value);
-}
-
-// With localForage, we allow promises:
-localforage.setItem('key', 'value').then(doSomethingElse);
-```
-
-When using Promises, `err` is **not** the first argument passed to a function.
-Instead, you handle an error with the rejection part of the Promise:
-
-```javascript
-// A full setItem() call with Promises.
-localforage.setItem('key', 'value').then(function(value) {
-    alert(value + ' was set!');
-}, function(error) {
-    console.error(error);
-});
-```
-
-localForage relies on native [ES6 Promises](https://www.promisejs.org/), but
-[ships with an awesome polyfill](https://github.com/jakearchibald/es6-promise)
-for browsers that don't support ES6 Promises yet.
-
-## Storing Blobs, TypedArrays, and other JS objects
-
 localForage supports storing all native JS objects that can be serialized to
@@ -134,0 +96,0 @@ JSON, as well as ArrayBuffers, Blobs, and TypedArrays. Check the

src/drivers/indexeddb.js

@@ -0,766 +1,689 @@
+import createBlob from '../utils/createBlob';
+import idb from '../utils/idb';
+import Promise from '../utils/promise';
+import executeCallback from '../utils/executeCallback';
+
 // Some code originally from async_storage.js in
 // [Gaia](https://github.com/mozilla-b2g/gaia).
-var asyncStorage = (function(globalObject) {
-    'use strict';
 
-    // Initialize IndexedDB; fall back to vendor-prefixed versions if needed.
-    var indexedDB = indexedDB || globalObject.indexedDB || globalObject.webkitIndexedDB ||
-                    globalObject.mozIndexedDB || globalObject.OIndexedDB ||
-                    globalObject.msIndexedDB;
+var DETECT_BLOB_SUPPORT_STORE = 'local-forage-detect-blob-support';
+var supportsBlobs;
+var dbContexts;
 
-    // If IndexedDB isn't available, we get outta here!
-    if (!indexedDB) {
-        return;
+// Transform a binary string to an array buffer, because otherwise
+// weird stuff happens when you try to work with the binary string directly.
+// It is known.
+// From http://stackoverflow.com/questions/14967647/ (continues on next line)
+// encode-decode-image-with-base64-breaks-image (2013-04-21)
+function _binStringToArrayBuffer(bin) {
+    var length = bin.length;
+    var buf = new ArrayBuffer(length);
+    var arr = new Uint8Array(buf);
+    for (var i = 0; i < length; i++) {
+        arr[i] = bin.charCodeAt(i);
     }
+    return buf;
+}
 
-    var DETECT_BLOB_SUPPORT_STORE = 'local-forage-detect-blob-support';
-    var supportsBlobs;
-    var dbContexts;
+//
+// Blobs are not supported in all versions of IndexedDB, notably
+// Chrome <37 and Android <5. In those versions, storing a blob will throw.
+//
+// Various other blob bugs exist in Chrome v37-42 (inclusive).
+// Detecting them is expensive and confusing to users, and Chrome 37-42
+// is at very low usage worldwide, so we do a hacky userAgent check instead.
+//
+// content-type bug: https://code.google.com/p/chromium/issues/detail?id=408120
+// 404 bug: https://code.google.com/p/chromium/issues/detail?id=447916
+// FileReader bug: https://code.google.com/p/chromium/issues/detail?id=447836
+//
+// Code borrowed from PouchDB. See:
+// https://github.com/pouchdb/pouchdb/blob/9c25a23/src/adapters/idb/blobSupport.js
+//
+function _checkBlobSupportWithoutCaching(txn) {
+    return new Promise(function(resolve) {
+        var blob = createBlob(['']);
+        txn.objectStore(DETECT_BLOB_SUPPORT_STORE).put(blob, 'key');
 
-    // Abstracts constructing a Blob object, so it also works in older
-    // browsers that don't support the native Blob constructor. (i.e.
-    // old QtWebKit versions, at least).
-    function _createBlob(parts, properties) {
-        parts = parts || [];
-        properties = properties || {};
-        try {
-            return new Blob(parts, properties);
-        } catch (e) {
-            if (e.name !== 'TypeError') {
-                throw e;
-            }
-            var BlobBuilder = globalObject.BlobBuilder ||
-                globalObject.MSBlobBuilder ||
-                globalObject.MozBlobBuilder ||
-                globalObject.WebKitBlobBuilder;
-            var builder = new BlobBuilder();
-            for (var i = 0; i < parts.length; i += 1) {
-                builder.append(parts[i]);
-            }
-            return builder.getBlob(properties.type);
-        }
-    }
+        txn.onabort = function(e) {
+            // If the transaction aborts now its due to not being able to
+            // write to the database, likely due to the disk being full
+            e.preventDefault();
+            e.stopPropagation();
+            resolve(false);
+        };
 
-    // Transform a binary string to an array buffer, because otherwise
-    // weird stuff happens when you try to work with the binary string directly.
-    // It is known.
-    // From http://stackoverflow.com/questions/14967647/ (continues on next line)
-    // encode-decode-image-with-base64-breaks-image (2013-04-21)
-    function _binStringToArrayBuffer(bin) {
-        var length = bin.length;
-        var buf = new ArrayBuffer(length);
-        var arr = new Uint8Array(buf);
-        for (var i = 0; i < length; i++) {
-            arr[i] = bin.charCodeAt(i);
-        }
-        return buf;
+        txn.oncomplete = function() {
+            var matchedChrome = navigator.userAgent.match(/Chrome\/(\d+)/);
+            var matchedEdge = navigator.userAgent.match(/Edge\//);
+            // MS Edge pretends to be Chrome 42:
+            // https://msdn.microsoft.com/en-us/library/hh869301%28v=vs.85%29.aspx
+            resolve(matchedEdge || !matchedChrome ||
+              parseInt(matchedChrome[1], 10) >= 43);
+        };
+    }).catch(function() {
+        return false; // error, so assume unsupported
+    });
+}
+
+function _checkBlobSupport(idb) {
+    if (typeof supportsBlobs === 'boolean') {
+        return Promise.resolve(supportsBlobs);
     }
+    return _checkBlobSupportWithoutCaching(idb).then(function(value) {
+        supportsBlobs = value;
+        return supportsBlobs;
+    });
+}
 
-    // Fetch a blob using ajax. This reveals bugs in Chrome < 43.
-    // For details on all this junk:
-    // https://github.com/nolanlawson/state-of-binary-data-in-the-browser#readme
-    function _blobAjax(url) {
-        return new Promise(function(resolve, reject) {
-            var xhr = new XMLHttpRequest();
-            xhr.open('GET', url);
-            xhr.withCredentials = true;
-            xhr.responseType = 'arraybuffer';
+function _deferReadiness(dbInfo) {
+    var dbContext = dbContexts[dbInfo.name];
 
-            xhr.onreadystatechange = function() {
-                if (xhr.readyState !== 4) {
-                    return;
-                }
-                if (xhr.status === 200) {
-                    return resolve({
-                        response: xhr.response,
-                        type: xhr.getResponseHeader('Content-Type')
-                    });
-                }
-                reject({status: xhr.status, response: xhr.response});
-            };
-            xhr.send();
-        });
-    }
+    // Create a deferred object representing the current database operation.
+    var deferredOperation = {};
 
-    //
-    // Detect blob support. Chrome didn't support it until version 38.
-    // In version 37 they had a broken version where PNGs (and possibly
-    // other binary types) aren't stored correctly, because when you fetch
-    // them, the content type is always null.
-    //
-    // Furthermore, they have some outstanding bugs where blobs occasionally
-    // are read by FileReader as null, or by ajax as 404s.
-    //
-    // Sadly we use the 404 bug to detect the FileReader bug, so if they
-    // get fixed independently and released in different versions of Chrome,
-    // then the bug could come back. So it's worthwhile to watch these issues:
-    // 404 bug: https://code.google.com/p/chromium/issues/detail?id=447916
-    // FileReader bug: https://code.google.com/p/chromium/issues/detail?id=447836
-    //
-    function _checkBlobSupportWithoutCaching(idb) {
-        return new Promise(function(resolve, reject) {
-            var blob = _createBlob([''], {type: 'image/png'});
-            var txn = idb.transaction([DETECT_BLOB_SUPPORT_STORE], 'readwrite');
-            txn.objectStore(DETECT_BLOB_SUPPORT_STORE).put(blob, 'key');
-            txn.oncomplete = function() {
-                // have to do it in a separate transaction, else the correct
-                // content type is always returned
-                var blobTxn = idb.transaction([DETECT_BLOB_SUPPORT_STORE],
-                    'readwrite');
-                var getBlobReq = blobTxn.objectStore(
-                    DETECT_BLOB_SUPPORT_STORE).get('key');
-                getBlobReq.onerror = reject;
-                getBlobReq.onsuccess = function(e) {
+    deferredOperation.promise = new Promise(function(resolve) {
+        deferredOperation.resolve = resolve;
+    });
 
-                    var storedBlob = e.target.result;
-                    var url = URL.createObjectURL(storedBlob);
+    // Enqueue the deferred operation.
+    dbContext.deferredOperations.push(deferredOperation);
 
-                    _blobAjax(url).then(function(res) {
-                        resolve(!!(res && res.type === 'image/png'));
-                    }, function() {
-                        resolve(false);
-                    }).then(function() {
-                        URL.revokeObjectURL(url);
-                    });
-                };
-            };
-            txn.onerror = txn.onabort = reject;
-        }).catch(function() {
-            return false; // error, so assume unsupported
+    // Chain its promise to the database readiness.
+    if (!dbContext.dbReady) {
+        dbContext.dbReady = deferredOperation.promise;
+    } else {
+        dbContext.dbReady = dbContext.dbReady.then(function() {
+            return deferredOperation.promise;
         });
     }
+}
 
-    function _checkBlobSupport(idb) {
-        if (typeof supportsBlobs === 'boolean') {
-            return Promise.resolve(supportsBlobs);
-        }
-        return _checkBlobSupportWithoutCaching(idb).then(function(value) {
-            supportsBlobs = value;
-            return supportsBlobs;
-        });
-    }
+function _advanceReadiness(dbInfo) {
+    var dbContext = dbContexts[dbInfo.name];
 
-    // encode a blob for indexeddb engines that don't support blobs
-    function _encodeBlob(blob) {
-        return new Promise(function(resolve, reject) {
-            var reader = new FileReader();
-            reader.onerror = reject;
-            reader.onloadend = function(e) {
-                var base64 = btoa(e.target.result || '');
-                resolve({
-                    __local_forage_encoded_blob: true,
-                    data: base64,
-                    type: blob.type
-                });
-            };
-            reader.readAsBinaryString(blob);
-        });
-    }
+    // Dequeue a deferred operation.
+    var deferredOperation = dbContext.deferredOperations.pop();
 
-    // decode an encoded blob
-    function _decodeBlob(encodedBlob) {
-        var arrayBuff = _binStringToArrayBuffer(atob(encodedBlob.data));
-        return _createBlob([arrayBuff], { type: encodedBlob.type});
+    // Resolve its promise (which is part of the database readiness
+    // chain of promises).
+    if (deferredOperation) {
+        deferredOperation.resolve();
     }
+}
 
-    // is this one of our fancy encoded blobs?
-    function _isEncodedBlob(value) {
-        return value && value.__local_forage_encoded_blob;
-    }
+function _getConnection(dbInfo, upgradeNeeded) {
+    return new Promise(function(resolve, reject) {
 
-    // Specialize the default `ready()` function by making it dependent
-    // on the current database operations. Thus, the driver will be actually
-    // ready when it's been initialized (default) *and* there are no pending
-    // operations on the database (initiated by some other instances).
-    function _fullyReady(callback) {
-        var self = this;
+        if (dbInfo.db) {
+            if (upgradeNeeded) {
+                _deferReadiness(dbInfo);
+                dbInfo.db.close();
+            } else {
+                return resolve(dbInfo.db);
+            }
+        }
 
-        var promise = self._initReady().then(() => {
-            var dbContext = dbContexts[self._dbInfo.name];
+        var dbArgs = [dbInfo.name];
 
-            if (dbContext && dbContext.dbReady) {
-                return dbContext.dbReady;
-            }
-        });
+        if (upgradeNeeded) {
+            dbArgs.push(dbInfo.version);
+        }
 
-        promise.then(callback, callback);
-        return promise;
-    }
+        var openreq = idb.open.apply(idb, dbArgs);
 
-    function _deferReadiness(dbInfo) {
-        var dbContext = dbContexts[dbInfo.name];
+        if (upgradeNeeded) {
+            openreq.onupgradeneeded = function(e) {
+                var db = openreq.result;
+                try {
+                    db.createObjectStore(dbInfo.storeName);
+                    if (e.oldVersion <= 1) {
+                        // Added when support for blob shims was added
+                        db.createObjectStore(DETECT_BLOB_SUPPORT_STORE);
+                    }
+                } catch (ex) {
+                    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.');
+                    } else {
+                        throw ex;
+                    }
+                }
+            };
+        }
 
-        // Create a deferred object representing the current database operation.
-        var deferredOperation = {};
+        openreq.onerror = function() {
+            reject(openreq.error);
+        };
 
-        deferredOperation.promise = new Promise(function(resolve) {
-            deferredOperation.resolve = resolve;
-        });
+        openreq.onsuccess = function() {
+            resolve(openreq.result);
+            _advanceReadiness(dbInfo);
+        };
+    });
+}
 
-        // Enqueue the deferred operation.
-        dbContext.deferredOperations.push(deferredOperation);
+function _getOriginalConnection(dbInfo) {
+    return _getConnection(dbInfo, false);
+}
 
-        // Chain its promise to the database readiness.
-        if (!dbContext.dbReady) {
-            dbContext.dbReady = deferredOperation.promise;
-        } else {
-            dbContext.dbReady = dbContext.dbReady.then(function() {
-                return deferredOperation.promise;
-            });
-        }
+function _getUpgradedConnection(dbInfo) {
+    return _getConnection(dbInfo, true);
+}
+
+function _isUpgradeNeeded(dbInfo, defaultVersion) {
+    if (!dbInfo.db) {
+        return true;
     }
 
-    function _advanceReadiness(dbInfo) {
-        var dbContext = dbContexts[dbInfo.name];
+    var isNewStore = !dbInfo.db.objectStoreNames.contains(dbInfo.storeName);
+    var isDowngrade = dbInfo.version < dbInfo.db.version;
+    var isUpgrade = dbInfo.version > dbInfo.db.version;
 
-        // Dequeue a deferred operation.
-        var deferredOperation = dbContext.deferredOperations.pop();
-
-        // Resolve its promise (which is part of the database readiness
-        // chain of promises).
-        if (deferredOperation) {
-            deferredOperation.resolve();
+    if (isDowngrade) {
+        // If the version is not the default one
+        // then warn for impossible downgrade.
+        if (dbInfo.version !== defaultVersion) {
+            console.warn('The database "' + dbInfo.name + '"' +
+                ' can\'t be downgraded from version ' + dbInfo.db.version +
+                ' to version ' + dbInfo.version + '.');
         }
+        // Align the versions to prevent errors.
+        dbInfo.version = dbInfo.db.version;
     }
 
-    // Open the IndexedDB database (automatically creates one if one didn't
-    // previously exist), using any options set in the config.
-    function _initStorage(options) {
-        var self = this;
-        var dbInfo = {
-            db: null
-        };
-
-        if (options) {
-            for (var i in options) {
-                dbInfo[i] = options[i];
+    if (isUpgrade || isNewStore) {
+        // If the store is new then increment the version (if needed).
+        // This will trigger an "upgradeneeded" event which is required
+        // for creating a store.
+        if (isNewStore) {
+            var incVersion = dbInfo.db.version + 1;
+            if (incVersion > dbInfo.version) {
+                dbInfo.version = incVersion;
             }
         }
 
-        // Initialize a singleton container for all running localForages.
-        if (!dbContexts) {
-            dbContexts = {};
-        }
+        return true;
+    }
 
-        // Get the current context of the database;
-        var dbContext = dbContexts[dbInfo.name];
+    return false;
+}
 
-        // ...or create a new context.
-        if (!dbContext) {
-            dbContext = {
-                // Running localForages sharing a database.
-                forages: [],
-                // Shared database.
-                db: null,
-                // Database readiness (promise).
-                dbReady: null,
-                // Deferred operations on the database.
-                deferredOperations: []
-            };
-            // Register the new context in the global container.
-            dbContexts[dbInfo.name] = dbContext;
-        }
+// encode a blob for indexeddb engines that don't support blobs
+function _encodeBlob(blob) {
+    return new Promise(function(resolve, reject) {
+        var reader = new FileReader();
+        reader.onerror = reject;
+        reader.onloadend = function(e) {
+            var base64 = btoa(e.target.result || '');
+            resolve({
+                __local_forage_encoded_blob: true,
+                data: base64,
+                type: blob.type
+            });
+        };
+        reader.readAsBinaryString(blob);
+    });
+}
 
-        // Register itself as a running localForage in the current context.
-        dbContext.forages.push(self);
+// decode an encoded blob
+function _decodeBlob(encodedBlob) {
+    var arrayBuff = _binStringToArrayBuffer(atob(encodedBlob.data));
+    return createBlob([arrayBuff], {type: encodedBlob.type});
+}
 
-        // Replace the default `ready()` function with the specialized one.
-        if (!self._initReady) {
-            self._initReady = self.ready;
-            self.ready = _fullyReady;
-        }
+// is this one of our fancy encoded blobs?
+function _isEncodedBlob(value) {
+    return value && value.__local_forage_encoded_blob;
+}
 
-        // Create an array of initialization states of the related localForages.
-        var initPromises = [];
+// Specialize the default `ready()` function by making it dependent
+// on the current database operations. Thus, the driver will be actually
+// ready when it's been initialized (default) *and* there are no pending
+// operations on the database (initiated by some other instances).
+function _fullyReady(callback) {
+    var self = this;
 
-        function ignoreErrors() {
-            // Don't handle errors here,
-            // just makes sure related localForages aren't pending.
-            return Promise.resolve();
-        }
+    var promise = self._initReady().then(function() {
+        var dbContext = dbContexts[self._dbInfo.name];
 
-        for (var j = 0; j < dbContext.forages.length; j++) {
-            var forage = dbContext.forages[j];
-            if (forage !== self) { // Don't wait for itself...
-                initPromises.push(forage._initReady().catch(ignoreErrors));
-            }
+        if (dbContext && dbContext.dbReady) {
+            return dbContext.dbReady;
         }
+    });
 
-        // Take a snapshot of the related localForages.
-        var forages = dbContext.forages.slice(0);
+    promise.then(callback, callback);
+    return promise;
+}
 
-        // Initialize the connection process only when
-        // 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;
-                }
-            }
-        });
-    }
+// Open the IndexedDB database (automatically creates one if one didn't
+// previously exist), using any options set in the config.
+function _initStorage(options) {
+    var self = this;
+    var dbInfo = {
+        db: null
+    };
 
-    function _getOriginalConnection(dbInfo) {
-        return _getConnection(dbInfo, false);
+    if (options) {
+        for (var i in options) {
+            dbInfo[i] = options[i];
+        }
     }
 
-    function _getUpgradedConnection(dbInfo) {
-        return _getConnection(dbInfo, true);
+    // Initialize a singleton container for all running localForages.
+    if (!dbContexts) {
+        dbContexts = {};
     }
 
-    function _getConnection(dbInfo, upgradeNeeded) {
-        return new Promise(function(resolve, reject) {
+    // Get the current context of the database;
+    var dbContext = dbContexts[dbInfo.name];
 
-            if (dbInfo.db) {
-                if (upgradeNeeded) {
-                    _deferReadiness(dbInfo);
-                    dbInfo.db.close();
-                } else {
-                    return resolve(dbInfo.db);
-                }
-            }
+    // ...or create a new context.
+    if (!dbContext) {
+        dbContext = {
+            // Running localForages sharing a database.
+            forages: [],
+            // Shared database.
+            db: null,
+            // Database readiness (promise).
+            dbReady: null,
+            // Deferred operations on the database.
+            deferredOperations: []
+        };
+        // Register the new context in the global container.
+        dbContexts[dbInfo.name] = dbContext;
+    }
 
-            var dbArgs = [dbInfo.name];
+    // Register itself as a running localForage in the current context.
+    dbContext.forages.push(self);
 
-            if (upgradeNeeded) {
-                dbArgs.push(dbInfo.version);
-            }
+    // Replace the default `ready()` function with the specialized one.
+    if (!self._initReady) {
+        self._initReady = self.ready;
+        self.ready = _fullyReady;
+    }
 
-            var openreq = indexedDB.open.apply(indexedDB, dbArgs);
+    // Create an array of initialization states of the related localForages.
+    var initPromises = [];
 
-            if (upgradeNeeded) {
-                openreq.onupgradeneeded = function(e) {
-                    var db = openreq.result;
-                    try {
-                        db.createObjectStore(dbInfo.storeName);
-                        if (e.oldVersion <= 1) {
-                            // Added when support for blob shims was added
-                            db.createObjectStore(DETECT_BLOB_SUPPORT_STORE);
-                        }
-                    } catch (ex) {
-                        if (ex.name === 'ConstraintError') {
-                            globalObject.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 {
-                            throw ex;
-                        }
-                    }
-                };
-            }
-
-            openreq.onerror = function() {
-                reject(openreq.error);
-            };
-
-            openreq.onsuccess = function() {
-                resolve(openreq.result);
-                _advanceReadiness(dbInfo);
-            };
-        });
+    function ignoreErrors() {
+        // Don't handle errors here,
+        // just makes sure related localForages aren't pending.
+        return Promise.resolve();
     }
 
-    function _isUpgradeNeeded(dbInfo, defaultVersion) {
-        if (!dbInfo.db) {
-            return true;
+    for (var j = 0; j < dbContext.forages.length; j++) {
+        var forage = dbContext.forages[j];
+        if (forage !== self) { // Don't wait for itself...
+            initPromises.push(forage._initReady().catch(ignoreErrors));
         }
+    }
 
-        var isNewStore = !dbInfo.db.objectStoreNames.contains(dbInfo.storeName);
-        var isDowngrade = dbInfo.version < dbInfo.db.version;
-        var isUpgrade = dbInfo.version > dbInfo.db.version;
+    // Take a snapshot of the related localForages.
+    var forages = dbContext.forages.slice(0);
 
-        if (isDowngrade) {
-            // If the version is not the default one
-            // then warn for impossible downgrade.
-            if (dbInfo.version !== defaultVersion) {
-                globalObject.console.warn('The database "' + dbInfo.name + '"' +
-                    ' can\'t be downgraded from version ' + dbInfo.db.version +
-                    ' to version ' + dbInfo.version + '.');
+    // Initialize the connection process only when
+    // 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;
             }
-            // Align the versions to prevent errors.
-            dbInfo.version = dbInfo.db.version;
         }
+    });
+}
 
-        if (isUpgrade || isNewStore) {
-            // If the store is new then increment the version (if needed).
-            // This will trigger an "upgradeneeded" event which is required
-            // for creating a store.
-            if (isNewStore) {
-                var incVersion = dbInfo.db.version + 1;
-                if (incVersion > dbInfo.version) {
-                    dbInfo.version = incVersion;
-                }
-            }
+function getItem(key, callback) {
+    var self = this;
 
-            return true;
-        }
-
-        return false;
+    // 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);
     }
 
-    function getItem(key, callback) {
-        var self = this;
+    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);
 
-        // Cast the key to a string, as that's all we can set as a key.
-        if (typeof key !== 'string') {
-            globalObject.console.warn(key +
-                                ' used as a key, but it is not a string.');
-            key = String(key);
-        }
+            req.onsuccess = function() {
+                var value = req.result;
+                if (value === undefined) {
+                    value = null;
+                }
+                if (_isEncodedBlob(value)) {
+                    value = _decodeBlob(value);
+                }
+                resolve(value);
+            };
 
-        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);
+            req.onerror = function() {
+                reject(req.error);
+            };
+        }).catch(reject);
+    });
 
-                req.onsuccess = function() {
-                    var value = req.result;
-                    if (value === undefined) {
-                        value = null;
-                    }
-                    if (_isEncodedBlob(value)) {
-                        value = _decodeBlob(value);
-                    }
-                    resolve(value);
-                };
+    executeCallback(promise, callback);
+    return promise;
+}
 
-                req.onerror = function() {
-                    reject(req.error);
-                };
-            }).catch(reject);
-        });
+// Iterate over all items stored in database.
+function iterate(iterator, callback) {
+    var self = this;
 
-        executeCallback(promise, callback);
-        return promise;
-    }
+    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);
 
-    // Iterate over all items stored in database.
-    function iterate(iterator, callback) {
-        var self = this;
+            var req = store.openCursor();
+            var iterationNumber = 1;
 
-        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);
+            req.onsuccess = function() {
+                var cursor = req.result;
 
-                var req = store.openCursor();
-                var iterationNumber = 1;
+                if (cursor) {
+                    var value = cursor.value;
+                    if (_isEncodedBlob(value)) {
+                        value = _decodeBlob(value);
+                    }
+                    var result = iterator(value, cursor.key,
+                        iterationNumber++);
 
-                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 (result !== void(0)) {
-                            resolve(result);
-                        } else {
-                            cursor.continue();
-                        }
+                    if (result !== void(0)) {
+                        resolve(result);
                     } else {
-                        resolve();
+                        cursor.continue();
                     }
-                };
+                } else {
+                    resolve();
+                }
+            };
 
-                req.onerror = function() {
-                    reject(req.error);
-                };
-            }).catch(reject);
-        });
+            req.onerror = function() {
+                reject(req.error);
+            };
+        }).catch(reject);
+    });
 
-        executeCallback(promise, callback);
+    executeCallback(promise, callback);
 
-        return promise;
+    return promise;
+}
+
+function setItem(key, value, 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);
     }
 
-    function setItem(key, value, callback) {
-        var self = this;
+    var promise = new Promise(function(resolve, reject) {
+        var dbInfo;
+        self.ready().then(function() {
+            dbInfo = self._dbInfo;
+            if (value instanceof Blob) {
+                return _checkBlobSupport(dbInfo.db).then(function(blobSupport) {
+                    if (blobSupport) {
+                        return value;
+                    }
+                    return _encodeBlob(value);
+                });
+            }
+            return value;
+        }).then(function(value) {
+            var transaction = dbInfo.db.transaction(dbInfo.storeName, 'readwrite');
+            var store = transaction.objectStore(dbInfo.storeName);
 
-        // Cast the key to a string, as that's all we can set as a key.
-        if (typeof key !== 'string') {
-            globalObject.console.warn(key +
-                                ' used as a key, but it is not a string.');
-            key = String(key);
-        }
+            // 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;
+            }
 
-        var promise = new Promise(function(resolve, reject) {
-            var dbInfo;
-            self.ready().then(function() {
-                dbInfo = self._dbInfo;
-                if (value instanceof Blob) {
-                    return _checkBlobSupport(dbInfo.db).then(function(blobSupport) {
-                        if (blobSupport) {
-                            return value;
-                        }
-                        return _encodeBlob(value);
-                    });
+            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;
                 }
-                return value;
-            }).then(function(value) {
-                var transaction = dbInfo.db.transaction(dbInfo.storeName, 'readwrite');
-                var store = transaction.objectStore(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;
-                }
+                resolve(value);
+            };
+            transaction.onabort = transaction.onerror = function() {
+                var err = req.error ? req.error : req.transaction.error;
+                reject(err);
+            };
 
-                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;
-                    }
+            var req = store.put(value, key);
+        }).catch(reject);
+    });
 
-                    resolve(value);
-                };
-                transaction.onabort = transaction.onerror = function() {
-                    var err = req.error ? req.error : req.transaction.error;
-                    reject(err);
-                };
+    executeCallback(promise, callback);
+    return promise;
+}
 
-                var req = store.put(value, key);
-            }).catch(reject);
-        });
+function removeItem(key, callback) {
+    var self = this;
 
-        executeCallback(promise, callback);
-        return promise;
+    // 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);
     }
 
-    function removeItem(key, callback) {
-        var self = this;
+    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);
 
-        // Cast the key to a string, as that's all we can set as a key.
-        if (typeof key !== 'string') {
-            globalObject.console.warn(key +
-                                ' used as a key, but it is not a string.');
-            key = String(key);
-        }
+            // 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();
+            };
 
-        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);
+            transaction.onerror = function() {
+                reject(req.error);
+            };
 
-                // 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();
-                };
+            // 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(reject);
+    });
 
-                transaction.onerror = function() {
-                    reject(req.error);
-                };
+    executeCallback(promise, callback);
+    return promise;
+}
 
-                // 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(reject);
-        });
+function clear(callback) {
+    var self = this;
 
-        executeCallback(promise, callback);
-        return promise;
-    }
+    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);
+            var req = store.clear();
 
-    function clear(callback) {
-        var self = this;
+            transaction.oncomplete = function() {
+                resolve();
+            };
 
-        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);
-                var req = store.clear();
+            transaction.onabort = transaction.onerror = function() {
+                var err = req.error ? req.error : req.transaction.error;
+                reject(err);
+            };
+        }).catch(reject);
+    });
 
-                transaction.oncomplete = function() {
-                    resolve();
-                };
+    executeCallback(promise, callback);
+    return promise;
+}
 
-                transaction.onabort = transaction.onerror = function() {
-                    var err = req.error ? req.error : req.transaction.error;
-                    reject(err);
-                };
-            }).catch(reject);
-        });
+function length(callback) {
+    var self = this;
 
-        executeCallback(promise, callback);
-        return promise;
-    }
+    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.count();
 
-    function length(callback) {
-        var self = this;
+            req.onsuccess = function() {
+                resolve(req.result);
+            };
 
-        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.count();
+            req.onerror = function() {
+                reject(req.error);
+            };
+        }).catch(reject);
+    });
 
-                req.onsuccess = function() {
-                    resolve(req.result);
-                };
+    executeCallback(promise, callback);
+    return promise;
+}
 
-                req.onerror = function() {
-                    reject(req.error);
-                };
-            }).catch(reject);
-        });
+function key(n, callback) {
+    var self = this;
 
-        executeCallback(promise, callback);
-        return promise;
-    }
+    var promise = new Promise(function(resolve, reject) {
+        if (n < 0) {
+            resolve(null);
 
-    function key(n, callback) {
-        var self = this;
+            return;
+        }
 
-        var promise = new Promise(function(resolve, reject) {
-            if (n < 0) {
-                resolve(null);
+        self.ready().then(function() {
+            var dbInfo = self._dbInfo;
+            var store = dbInfo.db.transaction(dbInfo.storeName, 'readonly')
+                .objectStore(dbInfo.storeName);
 
-                return;
-            }
+            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);
 
-            self.ready().then(function() {
-                var dbInfo = self._dbInfo;
-                var store = dbInfo.db.transaction(dbInfo.storeName, 'readonly')
-                              .objectStore(dbInfo.storeName);
+                    return;
+                }
 
-                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);
-
-                        return;
-                    }
-
-                    if (n === 0) {
-                        // We have the first key, return it if that's what they
-                        // wanted.
+                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);
-                    } 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(reject);
-        });
+            req.onerror = function() {
+                reject(req.error);
+            };
+        }).catch(reject);
+    });
 
-        executeCallback(promise, callback);
-        return promise;
-    }
+    executeCallback(promise, callback);
+    return promise;
+}
 
-    function keys(callback) {
-        var self = this;
+function keys(callback) {
+    var self = this;
 
-        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 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.openCursor();
-                var keys = [];
+            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);
-                };
-            }).catch(reject);
-        });
+            req.onerror = function() {
+                reject(req.error);
+            };
+        }).catch(reject);
+    });
 
-        executeCallback(promise, callback);
-        return promise;
-    }
+    executeCallback(promise, callback);
+    return promise;
+}
 
-    function executeCallback(promise, callback) {
-        if (callback) {
-            promise.then(function(result) {
-                callback(null, result);
-            }, function(error) {
-                callback(error);
-            });
-        }
-    }
-
-    var asyncStorage = {
-        _driver: 'asyncStorage',
-        _initStorage: _initStorage,
-        iterate: iterate,
-        getItem: getItem,
-        setItem: setItem,
-        removeItem: removeItem,
-        clear: clear,
-        length: length,
-        key: key,
-        keys: keys
-    };
-
-    return asyncStorage;
-})(typeof window !== 'undefined' ? window : self);
+var asyncStorage = {
+    _driver: 'asyncStorage',
+    _initStorage: _initStorage,
+    iterate: iterate,
+    getItem: getItem,
+    setItem: setItem,
+    removeItem: removeItem,
+    clear: clear,
+    length: length,
+    key: key,
+    keys: keys
+};
 export default asyncStorage;

src/drivers/localstorage.js

@@ -5,299 +5,267 @@ // If IndexedDB isn't available, we'll fall back to localStorage.
 // can be converted to a string via `JSON.stringify()` will be saved).
-var localStorageWrapper = (function(globalObject) {
-    'use strict';
 
-    var localStorage = null;
+import serializer from '../utils/serializer';
+import Promise from '../utils/promise';
+import executeCallback from '../utils/executeCallback';
 
-    // If the app is running inside a Google Chrome packaged webapp, or some
-    // other context where localStorage isn't available, we don't use
-    // localStorage. This feature detection is preferred over the old
-    // `if (window.chrome && window.chrome.runtime)` code.
-    // See: https://github.com/mozilla/localForage/issues/68
-    try {
-        // If localStorage isn't available, we get outta here!
-        // This should be inside a try catch
-        if (!globalObject.localStorage || !('setItem' in globalObject.localStorage)) {
-            return;
+// Config the localStorage backend, using options set in the config.
+function _initStorage(options) {
+    var self = this;
+    var dbInfo = {};
+    if (options) {
+        for (var i in options) {
+            dbInfo[i] = options[i];
         }
-        // Initialize localStorage and create a variable to use throughout
-        // the code.
-        localStorage = globalObject.localStorage;
-    } catch (e) {
-        return;
     }
 
-    // Config the localStorage backend, using options set in the config.
-    function _initStorage(options) {
-        var self = this;
-        var dbInfo = {};
-        if (options) {
-            for (var i in options) {
-                dbInfo[i] = options[i];
-            }
-        }
+    dbInfo.keyPrefix = dbInfo.name + '/';
 
-        dbInfo.keyPrefix = dbInfo.name + '/';
+    if (dbInfo.storeName !== self._defaultConfig.storeName) {
+        dbInfo.keyPrefix += dbInfo.storeName + '/';
+    }
 
-        if (dbInfo.storeName !== self._defaultConfig.storeName) {
-            dbInfo.keyPrefix += dbInfo.storeName + '/';
-        }
+    self._dbInfo = dbInfo;
+    dbInfo.serializer = serializer;
 
-        self._dbInfo = dbInfo;
+    return Promise.resolve();
+}
 
-        return System.import('./../utils/serializer').then(function(lib) {
-            dbInfo.serializer = lib;
-            return Promise.resolve();
-        });
-    }
+// Remove all keys from the datastore, effectively destroying all data in
+// the app's key/value store!
+function clear(callback) {
+    var self = this;
+    var promise = self.ready().then(function() {
+        var keyPrefix = self._dbInfo.keyPrefix;
 
-    // Remove all keys from the datastore, effectively destroying all data in
-    // the app's key/value store!
-    function clear(callback) {
-        var self = this;
-        var promise = self.ready().then(function() {
-            var keyPrefix = self._dbInfo.keyPrefix;
+        for (var i = localStorage.length - 1; i >= 0; i--) {
+            var key = localStorage.key(i);
 
-            for (var i = localStorage.length - 1; i >= 0; i--) {
-                var key = localStorage.key(i);
-
-                if (key.indexOf(keyPrefix) === 0) {
-                    localStorage.removeItem(key);
-                }
+            if (key.indexOf(keyPrefix) === 0) {
+                localStorage.removeItem(key);
             }
-        });
+        }
+    });
 
-        executeCallback(promise, callback);
-        return promise;
+    executeCallback(promise, callback);
+    return promise;
+}
+
+// Retrieve an item from the store. Unlike the original async_storage
+// library in Gaia, we don't modify return values at all. If a key's value
+// is `undefined`, we pass that value to the callback function.
+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);
     }
 
-    // Retrieve an item from the store. Unlike the original async_storage
-    // library in Gaia, we don't modify return values at all. If a key's value
-    // is `undefined`, we pass that value to the callback function.
-    function getItem(key, callback) {
-        var self = this;
+    var promise = self.ready().then(function() {
+        var dbInfo = self._dbInfo;
+        var result = localStorage.getItem(dbInfo.keyPrefix + key);
 
-        // Cast the key to a string, as that's all we can set as a key.
-        if (typeof key !== 'string') {
-            globalObject.console.warn(key +
-                                ' used as a key, but it is not a string.');
-            key = String(key);
+        // If a result was found, parse it from the serialized
+        // string into a JS object. If result isn't truthy, the key
+        // is likely undefined and we'll pass it straight to the
+        // callback.
+        if (result) {
+            result = dbInfo.serializer.deserialize(result);
         }
 
-        var promise = self.ready().then(function() {
-            var dbInfo = self._dbInfo;
-            var result = localStorage.getItem(dbInfo.keyPrefix + key);
+        return result;
+    });
 
-            // If a result was found, parse it from the serialized
-            // string into a JS object. If result isn't truthy, the key
-            // is likely undefined and we'll pass it straight to the
-            // callback.
-            if (result) {
-                result = dbInfo.serializer.deserialize(result);
-            }
+    executeCallback(promise, callback);
+    return promise;
+}
 
-            return result;
-        });
+// Iterate over all items in the store.
+function iterate(iterator, callback) {
+    var self = this;
 
-        executeCallback(promise, callback);
-        return promise;
-    }
+    var promise = self.ready().then(function() {
+        var dbInfo = self._dbInfo;
+        var keyPrefix = dbInfo.keyPrefix;
+        var keyPrefixLength = keyPrefix.length;
+        var length = localStorage.length;
 
-    // Iterate over all items in the store.
-    function iterate(iterator, callback) {
-        var self = this;
+        // We use a dedicated iterator instead of the `i` variable below
+        // so other keys we fetch in localStorage aren't counted in
+        // the `iterationNumber` argument passed to the `iterate()`
+        // callback.
+        //
+        // See: github.com/mozilla/localForage/pull/435#discussion_r38061530
+        var iterationNumber = 1;
 
-        var promise = self.ready().then(function() {
-            var dbInfo = self._dbInfo;
-            var keyPrefix = dbInfo.keyPrefix;
-            var keyPrefixLength = keyPrefix.length;
-            var length = localStorage.length;
+        for (var i = 0; i < length; i++) {
+            var key = localStorage.key(i);
+            if (key.indexOf(keyPrefix) !== 0) {
+                continue;
+            }
+            var value = localStorage.getItem(key);
 
-            // We use a dedicated iterator instead of the `i` variable below
-            // so other keys we fetch in localStorage aren't counted in
-            // the `iterationNumber` argument passed to the `iterate()`
-            // callback.
-            //
-            // See: github.com/mozilla/localForage/pull/435#discussion_r38061530
-            var iterationNumber = 1;
+            // If a result was found, parse it from the serialized
+            // string into a JS object. If result isn't truthy, the
+            // key is likely undefined and we'll pass it straight
+            // to the iterator.
+            if (value) {
+                value = dbInfo.serializer.deserialize(value);
+            }
 
-            for (var i = 0; i < length; i++) {
-                var key = localStorage.key(i);
-                if (key.indexOf(keyPrefix) !== 0) {
-                    continue;
-                }
-                var value = localStorage.getItem(key);
+            value = iterator(value, key.substring(keyPrefixLength),
+                iterationNumber++);
 
-                // If a result was found, parse it from the serialized
-                // string into a JS object. If result isn't truthy, the
-                // key is likely undefined and we'll pass it straight
-                // to the iterator.
-                if (value) {
-                    value = dbInfo.serializer.deserialize(value);
-                }
-
-                value = iterator(value, key.substring(keyPrefixLength),
-                                 iterationNumber++);
-
-                if (value !== void(0)) {
-                    return value;
-                }
+            if (value !== void(0)) {
+                return value;
             }
-        });
+        }
+    });
 
-        executeCallback(promise, callback);
-        return promise;
-    }
+    executeCallback(promise, callback);
+    return promise;
+}
 
-    // Same as localStorage's key() method, except takes a callback.
-    function key(n, callback) {
-        var self = this;
-        var promise = self.ready().then(function() {
-            var dbInfo = self._dbInfo;
-            var result;
-            try {
-                result = localStorage.key(n);
-            } catch (error) {
-                result = null;
-            }
+// Same as localStorage's key() method, except takes a callback.
+function key(n, callback) {
+    var self = this;
+    var promise = self.ready().then(function() {
+        var dbInfo = self._dbInfo;
+        var result;
+        try {
+            result = localStorage.key(n);
+        } catch (error) {
+            result = null;
+        }
 
-            // Remove the prefix from the key, if a key is found.
-            if (result) {
-                result = result.substring(dbInfo.keyPrefix.length);
-            }
+        // Remove the prefix from the key, if a key is found.
+        if (result) {
+            result = result.substring(dbInfo.keyPrefix.length);
+        }
 
-            return result;
-        });
+        return result;
+    });
 
-        executeCallback(promise, callback);
-        return promise;
-    }
+    executeCallback(promise, callback);
+    return promise;
+}
 
-    function keys(callback) {
-        var self = this;
-        var promise = self.ready().then(function() {
-            var dbInfo = self._dbInfo;
-            var length = localStorage.length;
-            var keys = [];
+function keys(callback) {
+    var self = this;
+    var promise = self.ready().then(function() {
+        var dbInfo = self._dbInfo;
+        var length = localStorage.length;
+        var keys = [];
 
-            for (var i = 0; i < length; i++) {
-                if (localStorage.key(i).indexOf(dbInfo.keyPrefix) === 0) {
-                    keys.push(localStorage.key(i).substring(dbInfo.keyPrefix.length));
-                }
+        for (var i = 0; i < length; i++) {
+            if (localStorage.key(i).indexOf(dbInfo.keyPrefix) === 0) {
+                keys.push(localStorage.key(i).substring(dbInfo.keyPrefix.length));
             }
+        }
 
-            return keys;
-        });
+        return keys;
+    });
 
-        executeCallback(promise, callback);
-        return promise;
-    }
+    executeCallback(promise, callback);
+    return promise;
+}
 
-    // Supply the number of keys in the datastore to the callback function.
-    function length(callback) {
-        var self = this;
-        var promise = self.keys().then(function(keys) {
-            return keys.length;
-        });
+// Supply the number of keys in the datastore to the callback function.
+function length(callback) {
+    var self = this;
+    var promise = self.keys().then(function(keys) {
+        return keys.length;
+    });
 
-        executeCallback(promise, callback);
-        return promise;
+    executeCallback(promise, callback);
+    return promise;
+}
+
+// Remove an item from the store, nice and simple.
+function removeItem(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);
     }
 
-    // Remove an item from the store, nice and simple.
-    function removeItem(key, callback) {
-        var self = this;
+    var promise = self.ready().then(function() {
+        var dbInfo = self._dbInfo;
+        localStorage.removeItem(dbInfo.keyPrefix + key);
+    });
 
-        // Cast the key to a string, as that's all we can set as a key.
-        if (typeof key !== 'string') {
-            globalObject.console.warn(key +
-                                ' used as a key, but it is not a string.');
-            key = String(key);
-        }
+    executeCallback(promise, callback);
+    return promise;
+}
 
-        var promise = self.ready().then(function() {
-            var dbInfo = self._dbInfo;
-            localStorage.removeItem(dbInfo.keyPrefix + key);
-        });
+// Set a key's value and run an optional callback once the value is set.
+// Unlike Gaia's implementation, the callback function is passed the value,
+// in case you want to operate on that value only after you're sure it
+// saved, or something like that.
+function setItem(key, value, callback) {
+    var self = this;
 
-        executeCallback(promise, callback);
-        return promise;
+    // 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);
     }
 
-    // Set a key's value and run an optional callback once the value is set.
-    // Unlike Gaia's implementation, the callback function is passed the value,
-    // in case you want to operate on that value only after you're sure it
-    // saved, or something like that.
-    function setItem(key, value, callback) {
-        var self = this;
-
-        // Cast the key to a string, as that's all we can set as a key.
-        if (typeof key !== 'string') {
-            globalObject.console.warn(key +
-                                ' used as a key, but it is not a string.');
-            key = String(key);
+    var promise = self.ready().then(function() {
+        // Convert undefined values to null.
+        // https://github.com/mozilla/localForage/pull/42
+        if (value === undefined) {
+            value = null;
         }
 
-        var promise = 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;
-
-            return new Promise(function(resolve, reject) {
-                var dbInfo = self._dbInfo;
-                dbInfo.serializer.serialize(value, function(value, error) {
-                    if (error) {
-                        reject(error);
-                    } else {
-                        try {
-                            localStorage.setItem(dbInfo.keyPrefix + key, value);
-                            resolve(originalValue);
-                        } catch (e) {
-                            // localStorage capacity exceeded.
-                            // TODO: Make this a specific error/event.
-                            if (e.name === 'QuotaExceededError' ||
-                                e.name === 'NS_ERROR_DOM_QUOTA_REACHED') {
-                                reject(e);
-                            }
+        return new Promise(function(resolve, reject) {
+            var dbInfo = self._dbInfo;
+            dbInfo.serializer.serialize(value, function(value, error) {
+                if (error) {
+                    reject(error);
+                } else {
+                    try {
+                        localStorage.setItem(dbInfo.keyPrefix + key, value);
+                        resolve(originalValue);
+                    } catch (e) {
+                        // localStorage capacity exceeded.
+                        // TODO: Make this a specific error/event.
+                        if (e.name === 'QuotaExceededError' ||
+                            e.name === 'NS_ERROR_DOM_QUOTA_REACHED') {
                             reject(e);
                         }
+                        reject(e);
                     }
-                });
+                }
             });
         });
+    });
 
-        executeCallback(promise, callback);
-        return promise;
-    }
+    executeCallback(promise, callback);
+    return promise;
+}
 
-    function executeCallback(promise, callback) {
-        if (callback) {
-            promise.then(function(result) {
-                callback(null, result);
-            }, function(error) {
-                callback(error);
-            });
-        }
-    }
+var localStorageWrapper = {
+    _driver: 'localStorageWrapper',
+    _initStorage: _initStorage,
+    // Default API, from Gaia/localStorage.
+    iterate: iterate,
+    getItem: getItem,
+    setItem: setItem,
+    removeItem: removeItem,
+    clear: clear,
+    length: length,
+    key: key,
+    keys: keys
+};
 
-    var localStorageWrapper = {
-        _driver: 'localStorageWrapper',
-        _initStorage: _initStorage,
-        // Default API, from Gaia/localStorage.
-        iterate: iterate,
-        getItem: getItem,
-        setItem: setItem,
-        removeItem: removeItem,
-        clear: clear,
-        length: length,
-        key: key,
-        keys: keys
-    };
-
-    return localStorageWrapper;
-})(typeof window !== 'undefined' ? window : self);
 export default localStorageWrapper;

src/drivers/websql.js

@@ -0,1 +1,5 @@
+import serializer from '../utils/serializer';
+import Promise from '../utils/promise';
+import executeCallback from '../utils/executeCallback';
+
 /*
@@ -10,363 +14,339 @@ * Includes code from:
  */
-var webSQLStorage = (function(globalObject) {
-    'use strict';
+// Open the WebSQL database (automatically creates one if one didn't
+// previously exist), using any options set in the config.
+function _initStorage(options) {
+    var self = this;
+    var dbInfo = {
+        db: null
+    };
 
-    var openDatabase = globalObject.openDatabase;
-
-    // If WebSQL methods aren't available, we can stop now.
-    if (!openDatabase) {
-        return;
+    if (options) {
+        for (var i in options) {
+            dbInfo[i] = typeof(options[i]) !== 'string' ?
+                        options[i].toString() : options[i];
+        }
     }
 
-    // Open the WebSQL database (automatically creates one if one didn't
-    // previously exist), using any options set in the config.
-    function _initStorage(options) {
-        var self = this;
-        var dbInfo = {
-            db: null
-        };
-
-        if (options) {
-            for (var i in options) {
-                dbInfo[i] = typeof(options[i]) !== 'string' ?
-                            options[i].toString() : options[i];
-            }
+    var dbInfoPromise = new Promise(function(resolve, reject) {
+        // Open the database; the openDatabase API will automatically
+        // create it for us if it doesn't exist.
+        try {
+            dbInfo.db = openDatabase(dbInfo.name, String(dbInfo.version),
+                                     dbInfo.description, dbInfo.size);
+        } catch (e) {
+            return reject(e);
         }
 
-        var dbInfoPromise = new Promise(function(resolve, reject) {
-            // Open the database; the openDatabase API will automatically
-            // create it for us if it doesn't exist.
-            try {
-                dbInfo.db = openDatabase(dbInfo.name, String(dbInfo.version),
-                                         dbInfo.description, dbInfo.size);
-            } catch (e) {
-                return reject(e);
-            }
+        // Create our key/value table if it doesn't exist.
+        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);
+            });
+        });
+    });
 
-            // Create our key/value table if it doesn't exist.
+    dbInfo.serializer = serializer;
+    return dbInfoPromise;
+}
+
+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);
+    }
+
+    var promise = new Promise(function(resolve, reject) {
+        self.ready().then(function() {
+            var dbInfo = self._dbInfo;
             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();
+                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);
+                    }
+
+                    resolve(result);
                 }, function(t, error) {
+
                     reject(error);
                 });
             });
-        });
+        }).catch(reject);
+    });
 
-        return System.import('./../utils/serializer').then(function(lib) {
-            dbInfo.serializer = lib;
-            return dbInfoPromise;
-        });
-    }
+    executeCallback(promise, callback);
+    return promise;
+}
 
-    function getItem(key, callback) {
-        var self = this;
+function iterate(iterator, callback) {
+    var self = this;
 
-        // Cast the key to a string, as that's all we can set as a key.
-        if (typeof key !== 'string') {
-            globalObject.console.warn(key +
-                                ' used as a key, but it is not a string.');
-            key = String(key);
-        }
+    var promise = new Promise(function(resolve, reject) {
+        self.ready().then(function() {
+            var dbInfo = self._dbInfo;
 
-        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;
+            dbInfo.db.transaction(function(t) {
+                t.executeSql('SELECT * FROM ' + dbInfo.storeName, [],
+                    function(t, results) {
+                        var rows = results.rows;
+                        var length = rows.length;
 
-                        // Check to see if this is serialized content we need to
-                        // unpack.
-                        if (result) {
-                            result = dbInfo.serializer.deserialize(result);
+                        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);
+                            }
+
+                            result = iterator(result, item.key, i + 1);
+
+                            // void(0) prevents problems with redefinition
+                            // of `undefined`.
+                            if (result !== void(0)) {
+                                resolve(result);
+                                return;
+                            }
                         }
 
-                        resolve(result);
+                        resolve();
                     }, function(t, error) {
-
                         reject(error);
                     });
-                });
-            }).catch(reject);
-        });
+            });
+        }).catch(reject);
+    });
 
-        executeCallback(promise, callback);
-        return promise;
-    }
+    executeCallback(promise, callback);
+    return promise;
+}
 
-    function iterate(iterator, callback) {
-        var self = this;
+function setItem(key, value, callback) {
+    var self = this;
 
-        var promise = new Promise(function(resolve, reject) {
-            self.ready().then(function() {
-                var dbInfo = self._dbInfo;
+    // 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);
+    }
 
-                dbInfo.db.transaction(function(t) {
-                    t.executeSql('SELECT * FROM ' + dbInfo.storeName, [],
-                        function(t, results) {
-                            var rows = results.rows;
-                            var length = rows.length;
+    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;
+            }
 
-                            for (var i = 0; i < length; i++) {
-                                var item = rows.item(i);
-                                var result = item.value;
+            // Save the original value to pass to the callback.
+            var originalValue = value;
 
-                                // 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);
-
-                                // void(0) prevents problems with redefinition
-                                // of `undefined`.
-                                if (result !== void(0)) {
-                                    resolve(result);
-                                    return;
-                                }
-                            }
-
-                            resolve();
+            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);
                         });
-                });
-            }).catch(reject);
-        });
-
-        executeCallback(promise, callback);
-        return promise;
-    }
-
-    function setItem(key, value, callback) {
-        var self = this;
-
-        // Cast the key to a string, as that's all we can set as a key.
-        if (typeof key !== 'string') {
-            globalObject.console.warn(key +
-                                ' used as a key, but it is not a string.');
-            key = String(key);
-        }
-
-        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;
+                    }, 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.
+                            //
+                            // TODO: Try to re-run the transaction.
+                            reject(sqlError);
+                        }
+                    });
                 }
+            });
+        }).catch(reject);
+    });
 
-                // Save the original value to pass to the callback.
-                var originalValue = value;
+    executeCallback(promise, callback);
+    return promise;
+}
 
-                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.
-                                //
-                                // TODO: Try to re-run the transaction.
-                                reject(sqlError);
-                            }
-                        });
-                    }
-                });
-            }).catch(reject);
-        });
+function removeItem(key, callback) {
+    var self = this;
 
-        executeCallback(promise, callback);
-        return promise;
+    // 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);
     }
 
-    function removeItem(key, callback) {
-        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('DELETE FROM ' + dbInfo.storeName +
+                             ' WHERE key = ?', [key],
+                             function() {
+                    resolve();
+                }, function(t, error) {
 
-        // Cast the key to a string, as that's all we can set as a key.
-        if (typeof key !== 'string') {
-            globalObject.console.warn(key +
-                                ' used as a key, but it is not a string.');
-            key = String(key);
-        }
-
-        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);
-                    });
+                    reject(error);
                 });
-            }).catch(reject);
-        });
+            });
+        }).catch(reject);
+    });
 
-        executeCallback(promise, callback);
-        return promise;
-    }
+    executeCallback(promise, callback);
+    return promise;
+}
 
-    // Deletes every item in the table.
-    // TODO: Find out if this resets the AUTO_INCREMENT number.
-    function clear(callback) {
-        var self = this;
+// Deletes every item in the table.
+// TODO: Find out if this resets the AUTO_INCREMENT number.
+function clear(callback) {
+    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('DELETE FROM ' + dbInfo.storeName, [],
-                                 function() {
-                        resolve();
-                    }, function(t, error) {
-                        reject(error);
-                    });
+    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);
-        });
+            });
+        }).catch(reject);
+    });
 
-        executeCallback(promise, callback);
-        return promise;
-    }
+    executeCallback(promise, callback);
+    return promise;
+}
 
-    // Does a simple `COUNT(key)` to get the number of items stored in
-    // localForage.
-    function length(callback) {
-        var self = this;
+// Does a simple `COUNT(key)` to get the number of items stored in
+// localForage.
+function length(callback) {
+    var self = this;
 
-        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;
+    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) {
+                    resolve(result);
+                }, function(t, error) {
 
-                        reject(error);
-                    });
+                    reject(error);
                 });
-            }).catch(reject);
-        });
+            });
+        }).catch(reject);
+    });
 
-        executeCallback(promise, callback);
-        return promise;
-    }
+    executeCallback(promise, callback);
+    return promise;
+}
 
-    // Return the key located at key index X; essentially gets the key from a
-    // `WHERE id = ?`. This is the most efficient way I can think to implement
-    // this rarely-used (in my experience) part of the API, but it can seem
-    // inconsistent, because we do `INSERT OR REPLACE INTO` on `setItem()`, so
-    // the ID of each key will change every time it's updated. Perhaps a stored
-    // procedure for the `setItem()` SQL would solve this problem?
-    // TODO: Don't change ID on `setItem()`.
-    function key(n, callback) {
-        var self = this;
+// Return the key located at key index X; essentially gets the key from a
+// `WHERE id = ?`. This is the most efficient way I can think to implement
+// this rarely-used (in my experience) part of the API, but it can seem
+// inconsistent, because we do `INSERT OR REPLACE INTO` on `setItem()`, so
+// the ID of each key will change every time it's updated. Perhaps a stored
+// procedure for the `setItem()` SQL would solve this problem?
+// TODO: Don't change ID on `setItem()`.
+function key(n, callback) {
+    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 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);
-                    });
+    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);
-        });
+            });
+        }).catch(reject);
+    });
 
-        executeCallback(promise, callback);
-        return promise;
-    }
+    executeCallback(promise, callback);
+    return promise;
+}
 
-    function keys(callback) {
-        var self = this;
+function keys(callback) {
+    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 key FROM ' + dbInfo.storeName, [],
-                                 function(t, results) {
-                        var keys = [];
+    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, [],
+                             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) {
+                    resolve(keys);
+                }, function(t, error) {
 
-                        reject(error);
-                    });
+                    reject(error);
                 });
-            }).catch(reject);
-        });
+            });
+        }).catch(reject);
+    });
 
-        executeCallback(promise, callback);
-        return promise;
-    }
+    executeCallback(promise, callback);
+    return promise;
+}
 
-    function executeCallback(promise, callback) {
-        if (callback) {
-            promise.then(function(result) {
-                callback(null, result);
-            }, function(error) {
-                callback(error);
-            });
-        }
-    }
+var webSQLStorage = {
+    _driver: 'webSQLStorage',
+    _initStorage: _initStorage,
+    iterate: iterate,
+    getItem: getItem,
+    setItem: setItem,
+    removeItem: removeItem,
+    clear: clear,
+    length: length,
+    key: key,
+    keys: keys
+};
 
-    var webSQLStorage = {
-        _driver: 'webSQLStorage',
-        _initStorage: _initStorage,
-        iterate: iterate,
-        getItem: getItem,
-        setItem: setItem,
-        removeItem: removeItem,
-        clear: clear,
-        length: length,
-        key: key,
-        keys: keys
-    };
-
-    return webSQLStorage;
-})(typeof window !== 'undefined' ? window : self);
 export default webSQLStorage;

src/localforage.js

@@ -1,131 +0,85 @@
-var localForage = (function(globalObject) {
-    'use strict';
+import isIndexedDBValid from './utils/isIndexedDBValid';
+import isWebSQLValid from './utils/isWebSQLValid';
+import isLocalStorageValid from './utils/isLocalStorageValid';
+import idbDriver from './drivers/indexeddb';
+import websqlDriver from './drivers/websql';
+import localstorageDriver from './drivers/localstorage';
+import serializer from './utils/serializer';
+import Promise from './utils/promise';
+import executeTwoCallbacks from './utils/executeTwoCallbacks';
 
-    // Custom drivers are stored here when `defineDriver()` is called.
-    // They are shared across all instances of localForage.
-    var CustomDrivers = {};
+// Custom drivers are stored here when `defineDriver()` is called.
+// They are shared across all instances of localForage.
+var CustomDrivers = {};
 
-    var DriverType = {
-        INDEXEDDB: 'asyncStorage',
-        LOCALSTORAGE: 'localStorageWrapper',
-        WEBSQL: 'webSQLStorage'
-    };
+var DriverType = {
+    INDEXEDDB: 'asyncStorage',
+    LOCALSTORAGE: 'localStorageWrapper',
+    WEBSQL: 'webSQLStorage'
+};
 
-    var DefaultDriverOrder = [
-        DriverType.INDEXEDDB,
-        DriverType.WEBSQL,
-        DriverType.LOCALSTORAGE
-    ];
+var DefaultDriverOrder = [
+    DriverType.INDEXEDDB,
+    DriverType.WEBSQL,
+    DriverType.LOCALSTORAGE
+];
 
-    var LibraryMethods = [
-        'clear',
-        'getItem',
-        'iterate',
-        'key',
-        'keys',
-        'length',
-        'removeItem',
-        'setItem'
-    ];
+var LibraryMethods = [
+    'clear',
+    'getItem',
+    'iterate',
+    'key',
+    'keys',
+    'length',
+    'removeItem',
+    'setItem'
+];
 
-    var DefaultConfig = {
-        description: '',
-        driver: DefaultDriverOrder.slice(),
-        name: 'localforage',
-        // Default DB size is _JUST UNDER_ 5MB, as it's the highest size
-        // we can use without a prompt.
-        size: 4980736,
-        storeName: 'keyvaluepairs',
-        version: 1.0
-    };
+var DefaultConfig = {
+    description: '',
+    driver: DefaultDriverOrder.slice(),
+    name: 'localforage',
+    // Default DB size is _JUST UNDER_ 5MB, as it's the highest size
+    // we can use without a prompt.
+    size: 4980736,
+    storeName: 'keyvaluepairs',
+    version: 1.0
+};
 
-    var driverSupport = (function(self) {
-        var result = {};
+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();
 
-        // 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
-        result[DriverType.INDEXEDDB] = !!(function() {
-            try {
-                // Initialize IndexedDB; fall back to vendor-prefixed versions
-                // if needed.
-                var indexedDB = indexedDB || self.indexedDB || self.webkitIndexedDB ||
-                                self.mozIndexedDB || self.OIndexedDB ||
-                                self.msIndexedDB;
-                // We mimic PouchDB here; just UA test for Safari (which, as of
-                // iOS 8/Yosemite, doesn't properly support IndexedDB).
-                // IndexedDB support is broken and different from Blink's.
-                // This is faster than the test case (and it's sync), so we just
-                // do this. *SIGH*
-                // http://bl.ocks.org/nolanlawson/raw/c83e9039edf2278047e9/
-                //
-                // We test for openDatabase because IE Mobile identifies itself
-                // as Safari. Oh the lulz...
-                if (typeof self.openDatabase !== 'undefined' && self.navigator &&
-                    self.navigator.userAgent &&
-                    /Safari/.test(self.navigator.userAgent) &&
-                    !/Chrome/.test(self.navigator.userAgent)) {
-                    return false;
-                }
+driverSupport[DriverType.WEBSQL] = isWebSQLValid();
 
-                return indexedDB &&
-                       typeof indexedDB.open === 'function' &&
-                       // Some Samsung/HTC Android 4.0-4.3 devices
-                       // have older IndexedDB specs; if this isn't available
-                       // their IndexedDB is too old for us to use.
-                       // (Replaces the onupgradeneeded test.)
-                       typeof self.IDBKeyRange !== 'undefined';
-            } catch (e) {
-                return false;
-            }
-        })();
+driverSupport[DriverType.LOCALSTORAGE] = isLocalStorageValid();
 
-        result[DriverType.WEBSQL] = !!(function() {
-            try {
-                return self.openDatabase;
-            } catch (e) {
-                return false;
-            }
-        })();
-
-        result[DriverType.LOCALSTORAGE] = !!(function() {
-            try {
-                return (self.localStorage &&
-                        ('setItem' in self.localStorage) &&
-                        (self.localStorage.setItem));
-            } catch (e) {
-                return false;
-            }
-        })();
-
-        return result;
-    })(globalObject);
-
-    var isArray = Array.isArray || function(arg) {
+var isArray = Array.isArray || function(arg) {
         return Object.prototype.toString.call(arg) === '[object Array]';
     };
 
-    function callWhenReady(localForageInstance, libraryMethod) {
-        localForageInstance[libraryMethod] = function() {
-            var _args = arguments;
-            return localForageInstance.ready().then(function() {
-                return localForageInstance[libraryMethod].apply(localForageInstance, _args);
-            });
-        };
-    }
+function callWhenReady(localForageInstance, libraryMethod) {
+    localForageInstance[libraryMethod] = function() {
+        var _args = arguments;
+        return localForageInstance.ready().then(function() {
+            return localForageInstance[libraryMethod].apply(localForageInstance, _args);
+        });
+    };
+}
 
-    function extend() {
-        for (var i = 1; i < arguments.length; i++) {
-            var arg = arguments[i];
+function extend() {
+    for (var i = 1; i < arguments.length; i++) {
+        var arg = arguments[i];
 
-            if (arg) {
-                for (var key in arg) {
-                    if (arg.hasOwnProperty(key)) {
-                        if (isArray(arg[key])) {
-                            arguments[0][key] = arg[key].slice();
-                        } else {
-                            arguments[0][key] = arg[key];
-                        }
+        if (arg) {
+            for (var key in arg) {
+                if (arg.hasOwnProperty(key)) {
+                    if (isArray(arg[key])) {
+                        arguments[0][key] = arg[key].slice();
+                    } else {
+                        arguments[0][key] = arg[key];
                     }
@@ -135,297 +89,290 @@ }
         }
-
-        return arguments[0];
     }
 
-    function isLibraryDriver(driverName) {
-        for (var driver in DriverType) {
-            if (DriverType.hasOwnProperty(driver) &&
-                DriverType[driver] === driverName) {
-                return true;
-            }
+    return arguments[0];
+}
+
+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;
+    return false;
+}
 
-            this._defaultConfig = extend({}, DefaultConfig);
-            this._config = extend({}, this._defaultConfig, options);
-            this._driverSet = null;
-            this._initDriver = null;
-            this._ready = false;
-            this._dbInfo = null;
+class LocalForage {
+    constructor(options) {
+        this.INDEXEDDB = DriverType.INDEXEDDB;
+        this.LOCALSTORAGE = DriverType.LOCALSTORAGE;
+        this.WEBSQL = DriverType.WEBSQL;
 
-            this._wrapLibraryMethodsWithReady();
-            this.setDriver(this._config.driver);
-        }
+        this._defaultConfig = extend({}, DefaultConfig);
+        this._config = extend({}, this._defaultConfig, options);
+        this._driverSet = null;
+        this._initDriver = null;
+        this._ready = false;
+        this._dbInfo = null;
 
-        // Set any config values for localForage; can be called anytime before
-        // the first API call (e.g. `getItem`, `setItem`).
-        // We loop through options so we don't overwrite existing config
-        // values.
-        config(options) {
-            // If the options argument is an object, we use it to set values.
-            // Otherwise, we return either a specified config value or all
-            // config values.
-            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.');
-                }
+        this._wrapLibraryMethodsWithReady();
+        this.setDriver(this._config.driver);
+    }
 
-                for (var i in options) {
-                    if (i === 'storeName') {
-                        options[i] = options[i].replace(/\W/g, '_');
-                    }
+    // Set any config values for localForage; can be called anytime before
+    // the first API call (e.g. `getItem`, `setItem`).
+    // We loop through options so we don't overwrite existing config
+    // values.
+    config(options) {
+        // If the options argument is an object, we use it to set values.
+        // Otherwise, we return either a specified config value or all
+        // config values.
+        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.');
+            }
 
-                    this._config[i] = options[i];
+            for (var i in options) {
+                if (i === 'storeName') {
+                    options[i] = options[i].replace(/\W/g, '_');
                 }
 
-                // after all config options are set and
-                // the driver option is used, try setting it
-                if ('driver' in options && options.driver) {
-                    this.setDriver(this._config.driver);
-                }
+                this._config[i] = options[i];
+            }
 
-                return true;
-            } else if (typeof(options) === 'string') {
-                return this._config[options];
-            } else {
-                return this._config;
+            // after all config options are set and
+            // the driver option is used, try setting it
+            if ('driver' in options && options.driver) {
+                this.setDriver(this._config.driver);
             }
+
+            return true;
+        } else if (typeof(options) === 'string') {
+            return this._config[options];
+        } else {
+            return this._config;
         }
+    }
 
-        // Used to define a custom driver, shared across all instances of
-        // localForage.
-        defineDriver(driverObject, callback, errorCallback) {
-            var promise = new Promise(function(resolve, reject) {
-                try {
-                    var driverName = driverObject._driver;
-                    var 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
-                    );
+    // Used to define a custom driver, shared across all instances of
+    // localForage.
+    defineDriver(driverObject, callback, errorCallback) {
+        var promise = new Promise(function(resolve, reject) {
+            try {
+                var driverName = driverObject._driver;
+                var 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
+                );
 
-                    // A driver name should be defined and not overlap with the
-                    // library-defined, default drivers.
-                    if (!driverObject._driver) {
+                // A driver name should be defined and not overlap with the
+                // library-defined, default drivers.
+                if (!driverObject._driver) {
+                    reject(complianceError);
+                    return;
+                }
+                if (isLibraryDriver(driverObject._driver)) {
+                    reject(namingError);
+                    return;
+                }
+
+                var customDriverMethods = LibraryMethods.concat('_initStorage');
+                for (var i = 0; i < customDriverMethods.length; i++) {
+                    var customDriverMethod = customDriverMethods[i];
+                    if (!customDriverMethod || !driverObject[customDriverMethod] ||
+                        typeof driverObject[customDriverMethod] !== 'function') {
                         reject(complianceError);
                         return;
                     }
-                    if (isLibraryDriver(driverObject._driver)) {
-                        reject(namingError);
-                        return;
-                    }
+                }
 
-                    var customDriverMethods = LibraryMethods.concat('_initStorage');
-                    for (var i = 0; i < customDriverMethods.length; i++) {
-                        var customDriverMethod = customDriverMethods[i];
-                        if (!customDriverMethod ||
-                            !driverObject[customDriverMethod] ||
-                            typeof driverObject[customDriverMethod] !== 'function') {
-                            reject(complianceError);
-                            return;
-                        }
+                var supportPromise = Promise.resolve(true);
+                if ('_support' in driverObject) {
+                    if (driverObject._support && typeof driverObject._support === 'function') {
+                        supportPromise = driverObject._support();
+                    } else {
+                        supportPromise = Promise.resolve(!!driverObject._support);
                     }
+                }
 
-                    var supportPromise = Promise.resolve(true);
-                    if ('_support'  in driverObject) {
-                        if (driverObject._support && typeof driverObject._support === 'function') {
-                            supportPromise = driverObject._support();
-                        } else {
-                            supportPromise = Promise.resolve(!!driverObject._support);
-                        }
-                    }
+                supportPromise.then(function(supportResult) {
+                    driverSupport[driverName] = supportResult;
+                    CustomDrivers[driverName] = driverObject;
+                    resolve();
+                }, reject);
+            } catch (e) {
+                reject(e);
+            }
+        });
 
-                    supportPromise.then(function(supportResult) {
-                        driverSupport[driverName] = supportResult;
-                        CustomDrivers[driverName] = driverObject;
-                        resolve();
-                    }, reject);
-                } catch (e) {
-                    reject(e);
-                }
-            });
+        executeTwoCallbacks(promise, callback, errorCallback);
+        return promise;
+    }
 
-            promise.then(callback, errorCallback);
-            return promise;
-        }
+    driver() {
+        return this._driver || null;
+    }
 
-        driver() {
-            return this._driver || null;
-        }
-
-        getDriver(driverName, callback, errorCallback) {
-            var self = this;
-            var getDriverPromise = (function() {
-                if (isLibraryDriver(driverName)) {
-                    switch (driverName) {
-                        case self.INDEXEDDB:
-                            return System.import('./drivers/indexeddb');
-                        case self.LOCALSTORAGE:
-                            return System.import('./drivers/localstorage');
-                        case self.WEBSQL:
-                            return System.import('./drivers/websql');
-                    }
-                } else if (CustomDrivers[driverName]) {
-                    return Promise.resolve(CustomDrivers[driverName]);
+    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.');
+            }
+        });
+        executeTwoCallbacks(getDriverPromise, callback, errorCallback);
+        return getDriverPromise;
+    }
 
-                return Promise.reject(new Error('Driver not found.'));
-            })();
+    getSerializer(callback) {
+        var serializerPromise = Promise.resolve(serializer);
+        executeTwoCallbacks(serializerPromise, callback);
+        return serializerPromise;
+    }
 
-            getDriverPromise.then(callback, errorCallback);
-            return getDriverPromise;
-        }
+    ready(callback) {
+        var self = this;
 
-        getSerializer(callback) {
-            var serializerPromise = System.import('./utils/serializer');
-            if (callback && typeof callback === 'function') {
-                serializerPromise.then(function(result) {
-                    callback(result);
-                });
+        var promise = self._driverSet.then(() => {
+            if (self._ready === null) {
+                self._ready = self._initDriver();
             }
-            return serializerPromise;
-        }
 
-        ready(callback) {
-            var self = this;
+            return self._ready;
+        });
 
-            var promise = self._driverSet.then(() => {
-                if (self._ready === null) {
-                    self._ready = self._initDriver();
-                }
+        executeTwoCallbacks(promise, callback, callback);
+        return promise;
+    }
 
-                return self._ready;
-            });
+    setDriver(drivers, callback, errorCallback) {
+        var self = this;
 
-            promise.then(callback, callback);
-            return promise;
+        if (!isArray(drivers)) {
+            drivers = [drivers];
         }
 
-        setDriver(drivers, callback, errorCallback) {
-            var self = this;
+        var supportedDrivers = this._getSupportedDrivers(drivers);
 
-            if (!isArray(drivers)) {
-                drivers = [drivers];
-            }
+        function setDriverToConfig() {
+            self._config.driver = self.driver();
+        }
 
-            var supportedDrivers = this._getSupportedDrivers(drivers);
+        function initDriver(supportedDrivers) {
+            return function() {
+                var currentDriverIndex = 0;
 
-            function setDriverToConfig() {
-                self._config.driver = self.driver();
-            }
+                function driverPromiseLoop() {
+                    while (currentDriverIndex < supportedDrivers.length) {
+                        var driverName = supportedDrivers[currentDriverIndex];
+                        currentDriverIndex++;
 
-            function initDriver(supportedDrivers) {
-                return function() {
-                    var currentDriverIndex = 0;
+                        self._dbInfo = null;
+                        self._ready = null;
 
-                    function driverPromiseLoop() {
-                        while (currentDriverIndex < supportedDrivers.length) {
-                            var driverName = supportedDrivers[currentDriverIndex];
-                            currentDriverIndex++;
+                        return self.getDriver(driverName)
+                            .then(driver => {
+                                self._extend(driver);
+                                setDriverToConfig();
 
-                            self._dbInfo = null;
-                            self._ready = null;
-
-                            return self.getDriver(driverName)
-                                .then(driver => {
-                                    self._extend(driver);
-                                    setDriverToConfig();
-
-                                    self._ready = self._initStorage(self._config);
-                                    return self._ready;
-                                })
-                                .catch(driverPromiseLoop);
-                        }
-
-                        setDriverToConfig();
-                        var error = new Error('No available storage method found.');
-                        self._driverSet = Promise.reject(error);
-                        return self._driverSet;
+                                self._ready = self._initStorage(self._config);
+                                return self._ready;
+                            })
+                            .catch(driverPromiseLoop);
                     }
 
-                    return driverPromiseLoop();
-                };
-            }
+                    setDriverToConfig();
+                    var error = new Error('No available storage method found.');
+                    self._driverSet = Promise.reject(error);
+                    return self._driverSet;
+                }
 
-            // There might be a driver initialization in progress
-            // so wait for it to finish in order to avoid a possible
-            // race condition to set _dbInfo
-            var oldDriverSetDone = this._driverSet !== null ?
-                this._driverSet.catch(() => Promise.resolve()) :
-                Promise.resolve();
+                return driverPromiseLoop();
+            };
+        }
 
-            this._driverSet = oldDriverSetDone.then(() => {
-                var driverName = supportedDrivers[0];
-                self._dbInfo = null;
-                self._ready = null;
+        // There might be a driver initialization in progress
+        // so wait for it to finish in order to avoid a possible
+        // race condition to set _dbInfo
+        var oldDriverSetDone = this._driverSet !== null ?
+            this._driverSet.catch(() => Promise.resolve()) :
+            Promise.resolve();
 
-                return self.getDriver(driverName)
-                    .then(driver => {
-                        self._driver = driver._driver;
-                        setDriverToConfig();
-                        self._wrapLibraryMethodsWithReady();
-                        self._initDriver = initDriver(supportedDrivers);
-                    });
-            }).catch(() => {
-                setDriverToConfig();
-                var error = new Error('No available storage method found.');
-                self._driverSet = Promise.reject(error);
-                return self._driverSet;
-            });
+        this._driverSet = oldDriverSetDone.then(() => {
+            var driverName = supportedDrivers[0];
+            self._dbInfo = null;
+            self._ready = null;
 
-            this._driverSet.then(callback, errorCallback);
-            return this._driverSet;
-        }
+            return self.getDriver(driverName)
+                .then(driver => {
+                    self._driver = driver._driver;
+                    setDriverToConfig();
+                    self._wrapLibraryMethodsWithReady();
+                    self._initDriver = initDriver(supportedDrivers);
+                });
+        }).catch(() => {
+            setDriverToConfig();
+            var error = new Error('No available storage method found.');
+            self._driverSet = Promise.reject(error);
+            return self._driverSet;
+        });
 
-        supports(driverName) {
-            return !!driverSupport[driverName];
-        }
+        executeTwoCallbacks(this._driverSet, callback, errorCallback);
+        return this._driverSet;
+    }
 
-        _extend(libraryMethodsAndProperties) {
-            extend(this, libraryMethodsAndProperties);
-        }
+    supports(driverName) {
+        return !!driverSupport[driverName];
+    }
 
-        _getSupportedDrivers(drivers) {
-            var supportedDrivers = [];
-            for (var i = 0, len = drivers.length; i < len; i++) {
-                var driverName = drivers[i];
-                if (this.supports(driverName)) {
-                    supportedDrivers.push(driverName);
-                }
-            }
-            return supportedDrivers;
-        }
+    _extend(libraryMethodsAndProperties) {
+        extend(this, libraryMethodsAndProperties);
+    }
 
-        _wrapLibraryMethodsWithReady() {
-            // Add a stub for each driver API method that delays the call to the
-            // corresponding driver method until localForage is ready. These stubs
-            // will be replaced by the driver methods as soon as the driver is
-            // loaded, so there is no performance impact.
-            for (var i = 0; i < LibraryMethods.length; i++) {
-                callWhenReady(this, LibraryMethods[i]);
+    _getSupportedDrivers(drivers) {
+        var supportedDrivers = [];
+        for (var i = 0, len = drivers.length; i < len; i++) {
+            var driverName = drivers[i];
+            if (this.supports(driverName)) {
+                supportedDrivers.push(driverName);
             }
         }
+        return supportedDrivers;
+    }
 
-        createInstance(options) {
-            return new LocalForage(options);
+    _wrapLibraryMethodsWithReady() {
+        // Add a stub for each driver API method that delays the call to the
+        // corresponding driver method until localForage is ready. These stubs
+        // will be replaced by the driver methods as soon as the driver is
+        // loaded, so there is no performance impact.
+        for (var i = 0; i < LibraryMethods.length; i++) {
+            callWhenReady(this, LibraryMethods[i]);
         }
     }
 
-    // The actual localForage object that we expose as a module or via a
-    // global. It's extended by pulling in one of our other libraries.
-    return new LocalForage();
-})(typeof window !== 'undefined' ? window : self);
-export default localForage;
+    createInstance(options) {
+        return new LocalForage(options);
+    }
+}
+
+// The actual localForage object that we expose as a module or via a
+// global. It's extended by pulling in one of our other libraries.
+export default new LocalForage();

src/utils/serializer.js

@@ -1,264 +0,233 @@
-var localforageSerializer = (function(globalObject) {
-    'use strict';
+import createBlob from './createBlob';
 
-    // Sadly, the best way to save binary data in WebSQL/localStorage is serializing
-    // it to Base64, so this is how we store it to prevent very strange errors with less
-    // verbose ways of binary <-> string data storage.
-    var BASE_CHARS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
+// Sadly, the best way to save binary data in WebSQL/localStorage is serializing
+// it to Base64, so this is how we store it to prevent very strange errors with less
+// verbose ways of binary <-> string data storage.
+var BASE_CHARS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
 
-    var BLOB_TYPE_PREFIX = '~~local_forage_type~';
-    var BLOB_TYPE_PREFIX_REGEX = /^~~local_forage_type~([^~]+)~/;
+var BLOB_TYPE_PREFIX = '~~local_forage_type~';
+var BLOB_TYPE_PREFIX_REGEX = /^~~local_forage_type~([^~]+)~/;
 
-    var SERIALIZED_MARKER = '__lfsc__:';
-    var SERIALIZED_MARKER_LENGTH = SERIALIZED_MARKER.length;
+var SERIALIZED_MARKER = '__lfsc__:';
+var SERIALIZED_MARKER_LENGTH = SERIALIZED_MARKER.length;
 
-    // OMG the serializations!
-    var TYPE_ARRAYBUFFER = 'arbf';
-    var TYPE_BLOB = 'blob';
-    var TYPE_INT8ARRAY = 'si08';
-    var TYPE_UINT8ARRAY = 'ui08';
-    var TYPE_UINT8CLAMPEDARRAY = 'uic8';
-    var TYPE_INT16ARRAY = 'si16';
-    var TYPE_INT32ARRAY = 'si32';
-    var TYPE_UINT16ARRAY = 'ur16';
-    var TYPE_UINT32ARRAY = 'ui32';
-    var TYPE_FLOAT32ARRAY = 'fl32';
-    var TYPE_FLOAT64ARRAY = 'fl64';
-    var TYPE_SERIALIZED_MARKER_LENGTH = SERIALIZED_MARKER_LENGTH +
-                                        TYPE_ARRAYBUFFER.length;
+// OMG the serializations!
+var TYPE_ARRAYBUFFER = 'arbf';
+var TYPE_BLOB = 'blob';
+var TYPE_INT8ARRAY = 'si08';
+var TYPE_UINT8ARRAY = 'ui08';
+var TYPE_UINT8CLAMPEDARRAY = 'uic8';
+var TYPE_INT16ARRAY = 'si16';
+var TYPE_INT32ARRAY = 'si32';
+var TYPE_UINT16ARRAY = 'ur16';
+var TYPE_UINT32ARRAY = 'ui32';
+var TYPE_FLOAT32ARRAY = 'fl32';
+var TYPE_FLOAT64ARRAY = 'fl64';
+var TYPE_SERIALIZED_MARKER_LENGTH = SERIALIZED_MARKER_LENGTH +
+    TYPE_ARRAYBUFFER.length;
 
-    // Abstracts constructing a Blob object, so it also works in older
-    // browsers that don't support the native Blob constructor. (i.e.
-    // old QtWebKit versions, at least).
-    function _createBlob(parts, properties) {
-        parts = parts || [];
-        properties = properties || {};
+function stringToBuffer(serializedString) {
+    // Fill the string into a ArrayBuffer.
+    var bufferLength = serializedString.length * 0.75;
+    var len = serializedString.length;
+    var i;
+    var p = 0;
+    var encoded1, encoded2, encoded3, encoded4;
 
-        try {
-            return new Blob(parts, properties);
-        } catch (err) {
-            if (err.name !== 'TypeError') {
-                throw err;
-            }
-
-            var BlobBuilder = globalObject.BlobBuilder ||
-                              globalObject.MSBlobBuilder ||
-                              globalObject.MozBlobBuilder ||
-                              globalObject.WebKitBlobBuilder;
-
-            var builder = new BlobBuilder();
-            for (var i = 0; i < parts.length; i += 1) {
-                builder.append(parts[i]);
-            }
-
-            return builder.getBlob(properties.type);
+    if (serializedString[serializedString.length - 1] === '=') {
+        bufferLength--;
+        if (serializedString[serializedString.length - 2] === '=') {
+            bufferLength--;
         }
     }
 
-    // Serialize a value, afterwards executing a callback (which usually
-    // instructs the `setItem()` callback/promise to be executed). This is how
-    // we store binary data with localStorage.
-    function serialize(value, callback) {
-        var valueString = '';
-        if (value) {
-            valueString = value.toString();
-        }
+    var buffer = new ArrayBuffer(bufferLength);
+    var bytes = new Uint8Array(buffer);
 
-        // Cannot use `value instanceof ArrayBuffer` or such here, as these
-        // checks fail when running the tests using casper.js...
-        //
-        // TODO: See why those tests fail and use a better solution.
-        if (value && (value.toString() === '[object ArrayBuffer]' ||
-                      value.buffer &&
-                      value.buffer.toString() === '[object ArrayBuffer]')) {
-            // Convert binary arrays to a string and prefix the string with
-            // a special marker.
-            var buffer;
-            var marker = SERIALIZED_MARKER;
+    for (i = 0; i < len; i += 4) {
+        encoded1 = BASE_CHARS.indexOf(serializedString[i]);
+        encoded2 = BASE_CHARS.indexOf(serializedString[i + 1]);
+        encoded3 = BASE_CHARS.indexOf(serializedString[i + 2]);
+        encoded4 = BASE_CHARS.indexOf(serializedString[i + 3]);
 
-            if (value instanceof ArrayBuffer) {
-                buffer = value;
-                marker += TYPE_ARRAYBUFFER;
-            } else {
-                buffer = value.buffer;
+        /*jslint bitwise: true */
+        bytes[p++] = (encoded1 << 2) | (encoded2 >> 4);
+        bytes[p++] = ((encoded2 & 15) << 4) | (encoded3 >> 2);
+        bytes[p++] = ((encoded3 & 3) << 6) | (encoded4 & 63);
+    }
+    return buffer;
+}
 
-                if (valueString === '[object Int8Array]') {
-                    marker += TYPE_INT8ARRAY;
-                } else if (valueString === '[object Uint8Array]') {
-                    marker += TYPE_UINT8ARRAY;
-                } else if (valueString === '[object Uint8ClampedArray]') {
-                    marker += TYPE_UINT8CLAMPEDARRAY;
-                } else if (valueString === '[object Int16Array]') {
-                    marker += TYPE_INT16ARRAY;
-                } else if (valueString === '[object Uint16Array]') {
-                    marker += TYPE_UINT16ARRAY;
-                } else if (valueString === '[object Int32Array]') {
-                    marker += TYPE_INT32ARRAY;
-                } else if (valueString === '[object Uint32Array]') {
-                    marker += TYPE_UINT32ARRAY;
-                } else if (valueString === '[object Float32Array]') {
-                    marker += TYPE_FLOAT32ARRAY;
-                } else if (valueString === '[object Float64Array]') {
-                    marker += TYPE_FLOAT64ARRAY;
-                } else {
-                    callback(new Error('Failed to get type for BinaryArray'));
-                }
-            }
+// Converts a buffer to a string to store, serialized, in the backend
+// storage library.
+function bufferToString(buffer) {
+    // base64-arraybuffer
+    var bytes = new Uint8Array(buffer);
+    var base64String = '';
+    var i;
 
-            callback(marker + bufferToString(buffer));
-        } else if (valueString === '[object Blob]') {
-            // Conver the blob to a binaryArray and then to a string.
-            var fileReader = new FileReader();
+    for (i = 0; i < bytes.length; i += 3) {
+        /*jslint bitwise: true */
+        base64String += BASE_CHARS[bytes[i] >> 2];
+        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 + 2] & 63];
+    }
 
-            fileReader.onload = function() {
-                // Backwards-compatible prefix for the blob type.
-                var str = BLOB_TYPE_PREFIX + value.type + '~' +
-                    bufferToString(this.result);
+    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) + '==';
+    }
 
-                callback(SERIALIZED_MARKER + TYPE_BLOB + str);
-            };
+    return base64String;
+}
 
-            fileReader.readAsArrayBuffer(value);
-        } else {
-            try {
-                callback(JSON.stringify(value));
-            } catch (e) {
-                console.error("Couldn't convert value into a JSON string: ",
-                              value);
-
-                callback(null, e);
-            }
-        }
+// Serialize a value, afterwards executing a callback (which usually
+// instructs the `setItem()` callback/promise to be executed). This is how
+// we store binary data with localStorage.
+function serialize(value, callback) {
+    var valueString = '';
+    if (value) {
+        valueString = value.toString();
     }
 
-    // Deserialize data we've inserted into a value column/field. We place
-    // special markers into our strings to mark them as encoded; this isn't
-    // as nice as a meta field, but it's the only sane thing we can do whilst
-    // keeping localStorage support intact.
+    // Cannot use `value instanceof ArrayBuffer` or such here, as these
+    // checks fail when running the tests using casper.js...
     //
-    // Oftentimes this will just deserialize JSON content, but if we have a
-    // special marker (SERIALIZED_MARKER, defined above), we will extract
-    // some kind of arraybuffer/binary data/typed array out of the string.
-    function deserialize(value) {
-        // If we haven't marked this string as being specially serialized (i.e.
-        // something other than serialized JSON), we can just return it and be
-        // done with it.
-        if (value.substring(0,
-            SERIALIZED_MARKER_LENGTH) !== SERIALIZED_MARKER) {
-            return JSON.parse(value);
-        }
+    // TODO: See why those tests fail and use a better solution.
+    if (value && (value.toString() === '[object ArrayBuffer]' ||
+        value.buffer &&
+        value.buffer.toString() === '[object ArrayBuffer]')) {
+        // Convert binary arrays to a string and prefix the string with
+        // a special marker.
+        var buffer;
+        var marker = SERIALIZED_MARKER;
 
-        // The following code deals with deserializing some kind of Blob or
-        // TypedArray. First we separate out the type of data we're dealing
-        // with from the data itself.
-        var serializedString = value.substring(TYPE_SERIALIZED_MARKER_LENGTH);
-        var type = value.substring(SERIALIZED_MARKER_LENGTH,
-                                   TYPE_SERIALIZED_MARKER_LENGTH);
+        if (value instanceof ArrayBuffer) {
+            buffer = value;
+            marker += TYPE_ARRAYBUFFER;
+        } else {
+            buffer = value.buffer;
 
-        var blobType;
-        // Backwards-compatible blob type serialization strategy.
-        // DBs created with older versions of localForage will simply not have the blob type.
-        if (type === TYPE_BLOB && BLOB_TYPE_PREFIX_REGEX.test(serializedString)) {
-            var matcher = serializedString.match(BLOB_TYPE_PREFIX_REGEX);
-            blobType = matcher[1];
-            serializedString = serializedString.substring(matcher[0].length);
+            if (valueString === '[object Int8Array]') {
+                marker += TYPE_INT8ARRAY;
+            } else if (valueString === '[object Uint8Array]') {
+                marker += TYPE_UINT8ARRAY;
+            } else if (valueString === '[object Uint8ClampedArray]') {
+                marker += TYPE_UINT8CLAMPEDARRAY;
+            } else if (valueString === '[object Int16Array]') {
+                marker += TYPE_INT16ARRAY;
+            } else if (valueString === '[object Uint16Array]') {
+                marker += TYPE_UINT16ARRAY;
+            } else if (valueString === '[object Int32Array]') {
+                marker += TYPE_INT32ARRAY;
+            } else if (valueString === '[object Uint32Array]') {
+                marker += TYPE_UINT32ARRAY;
+            } else if (valueString === '[object Float32Array]') {
+                marker += TYPE_FLOAT32ARRAY;
+            } else if (valueString === '[object Float64Array]') {
+                marker += TYPE_FLOAT64ARRAY;
+            } else {
+                callback(new Error('Failed to get type for BinaryArray'));
+            }
         }
-        var buffer = stringToBuffer(serializedString);
 
-        // Return the right type based on the code/type set during
-        // serialization.
-        switch (type) {
-            case TYPE_ARRAYBUFFER:
-                return buffer;
-            case TYPE_BLOB:
-                return _createBlob([buffer], {type: blobType});
-            case TYPE_INT8ARRAY:
-                return new Int8Array(buffer);
-            case TYPE_UINT8ARRAY:
-                return new Uint8Array(buffer);
-            case TYPE_UINT8CLAMPEDARRAY:
-                return new Uint8ClampedArray(buffer);
-            case TYPE_INT16ARRAY:
-                return new Int16Array(buffer);
-            case TYPE_UINT16ARRAY:
-                return new Uint16Array(buffer);
-            case TYPE_INT32ARRAY:
-                return new Int32Array(buffer);
-            case TYPE_UINT32ARRAY:
-                return new Uint32Array(buffer);
-            case TYPE_FLOAT32ARRAY:
-                return new Float32Array(buffer);
-            case TYPE_FLOAT64ARRAY:
-                return new Float64Array(buffer);
-            default:
-                throw new Error('Unkown type: ' + type);
-        }
-    }
+        callback(marker + bufferToString(buffer));
+    } else if (valueString === '[object Blob]') {
+        // Conver the blob to a binaryArray and then to a string.
+        var fileReader = new FileReader();
 
-    function stringToBuffer(serializedString) {
-        // Fill the string into a ArrayBuffer.
-        var bufferLength = serializedString.length * 0.75;
-        var len = serializedString.length;
-        var i;
-        var p = 0;
-        var encoded1, encoded2, encoded3, encoded4;
+        fileReader.onload = function() {
+            // Backwards-compatible prefix for the blob type.
+            var str = BLOB_TYPE_PREFIX + value.type + '~' +
+                bufferToString(this.result);
 
-        if (serializedString[serializedString.length - 1] === '=') {
-            bufferLength--;
-            if (serializedString[serializedString.length - 2] === '=') {
-                bufferLength--;
-            }
-        }
+            callback(SERIALIZED_MARKER + TYPE_BLOB + str);
+        };
 
-        var buffer = new ArrayBuffer(bufferLength);
-        var bytes = new Uint8Array(buffer);
+        fileReader.readAsArrayBuffer(value);
+    } else {
+        try {
+            callback(JSON.stringify(value));
+        } catch (e) {
+            console.error("Couldn't convert value into a JSON string: ",
+                value);
 
-        for (i = 0; i < len; i+=4) {
-            encoded1 = BASE_CHARS.indexOf(serializedString[i]);
-            encoded2 = BASE_CHARS.indexOf(serializedString[i+1]);
-            encoded3 = BASE_CHARS.indexOf(serializedString[i+2]);
-            encoded4 = BASE_CHARS.indexOf(serializedString[i+3]);
-
-            /*jslint bitwise: true */
-            bytes[p++] = (encoded1 << 2) | (encoded2 >> 4);
-            bytes[p++] = ((encoded2 & 15) << 4) | (encoded3 >> 2);
-            bytes[p++] = ((encoded3 & 3) << 6) | (encoded4 & 63);
+            callback(null, e);
         }
-        return buffer;
     }
+}
 
-    // Converts a buffer to a string to store, serialized, in the backend
-    // storage library.
-    function bufferToString(buffer) {
-        // base64-arraybuffer
-        var bytes = new Uint8Array(buffer);
-        var base64String = '';
-        var i;
+// Deserialize data we've inserted into a value column/field. We place
+// special markers into our strings to mark them as encoded; this isn't
+// as nice as a meta field, but it's the only sane thing we can do whilst
+// keeping localStorage support intact.
+//
+// Oftentimes this will just deserialize JSON content, but if we have a
+// special marker (SERIALIZED_MARKER, defined above), we will extract
+// some kind of arraybuffer/binary data/typed array out of the string.
+function deserialize(value) {
+    // If we haven't marked this string as being specially serialized (i.e.
+    // something other than serialized JSON), we can just return it and be
+    // done with it.
+    if (value.substring(0,
+            SERIALIZED_MARKER_LENGTH) !== SERIALIZED_MARKER) {
+        return JSON.parse(value);
+    }
 
-        for (i = 0; i < bytes.length; i += 3) {
-            /*jslint bitwise: true */
-            base64String += BASE_CHARS[bytes[i] >> 2];
-            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 + 2] & 63];
-        }
+    // The following code deals with deserializing some kind of Blob or
+    // TypedArray. First we separate out the type of data we're dealing
+    // with from the data itself.
+    var serializedString = value.substring(TYPE_SERIALIZED_MARKER_LENGTH);
+    var type = value.substring(SERIALIZED_MARKER_LENGTH,
+        TYPE_SERIALIZED_MARKER_LENGTH);
 
-        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) + '==';
-        }
+    var blobType;
+    // Backwards-compatible blob type serialization strategy.
+    // DBs created with older versions of localForage will simply not have the blob type.
+    if (type === TYPE_BLOB && BLOB_TYPE_PREFIX_REGEX.test(serializedString)) {
+        var matcher = serializedString.match(BLOB_TYPE_PREFIX_REGEX);
+        blobType = matcher[1];
+        serializedString = serializedString.substring(matcher[0].length);
+    }
+    var buffer = stringToBuffer(serializedString);
 
-        return base64String;
+    // Return the right type based on the code/type set during
+    // serialization.
+    switch (type) {
+        case TYPE_ARRAYBUFFER:
+            return buffer;
+        case TYPE_BLOB:
+            return createBlob([buffer], {type: blobType});
+        case TYPE_INT8ARRAY:
+            return new Int8Array(buffer);
+        case TYPE_UINT8ARRAY:
+            return new Uint8Array(buffer);
+        case TYPE_UINT8CLAMPEDARRAY:
+            return new Uint8ClampedArray(buffer);
+        case TYPE_INT16ARRAY:
+            return new Int16Array(buffer);
+        case TYPE_UINT16ARRAY:
+            return new Uint16Array(buffer);
+        case TYPE_INT32ARRAY:
+            return new Int32Array(buffer);
+        case TYPE_UINT32ARRAY:
+            return new Uint32Array(buffer);
+        case TYPE_FLOAT32ARRAY:
+            return new Float32Array(buffer);
+        case TYPE_FLOAT64ARRAY:
+            return new Float64Array(buffer);
+        default:
+            throw new Error('Unkown type: ' + type);
     }
+}
 
-    var localforageSerializer = {
-        serialize: serialize,
-        deserialize: deserialize,
-        stringToBuffer: stringToBuffer,
-        bufferToString: bufferToString
-    };
+var localforageSerializer = {
+    serialize: serialize,
+    deserialize: deserialize,
+    stringToBuffer: stringToBuffer,
+    bufferToString: bufferToString
+};
 
-    return localforageSerializer;
-})(typeof window !== 'undefined' ? window : self);
 export default localforageSerializer;

test/dummyStorageDriver.js

 (function() {
     'use strict';
 
-    // Promises!
-    var Promise = (typeof module !== 'undefined' && module.exports && typeof require !== 'undefined') ?
-                  require('promise') : this.Promise;
-
     var dummyStorage = {};
@@ -9,0 +5,0 @@

test/runner.js

@@ -53,23 +53,8 @@ // Run before window.onload to make sure the specs have access to describe()
 if (require) {
-    if (this.requireUnbundledLocalForage) {
-        requirejs.config({
-            paths: {
-                localforage: '/build/es5src/localforage',
-                localforageSerializer: '/build/es5src/utils/serializer',
-                asyncStorage: '/build/es5src/drivers/indexeddb',
-                localStorageWrapper: '/build/es5src/drivers/localstorage',
-                webSQLStorage: '/build/es5src/drivers/websql',
-                Promise: '/bower_components/es6-promise/promise'
-            },
-            shim: {
-                localforage: ['Promise']
-            }
-        });
-    } else {
-        requirejs.config({
-            paths: {
-                localforage: '/dist/localforage'
-            }
-        });
-    }
+
+    requirejs.config({
+        paths: {
+            localforage: '/dist/localforage'
+        }
+    });
     require(['localforage'], function(localforage) {
@@ -76,0 +61,0 @@ window.localforage = localforage;

test/test.api.js

@@ -1,2 +0,2 @@
-/* global after:true, afterEach:true, before:true, beforeEach:true, describe:true, expect:true, it:true, Promise:true, require:true */
+/* global after:true, afterEach:true, before:true, beforeEach:true, describe:true, expect:true, it:true, Promise:true */
 var DRIVERS = [
@@ -18,16 +18,6 @@ localforage.INDEXEDDB,
 
-var componentBuild = window.require && window.require.modules &&
-                     window.require.modules.localforage &&
-                     window.require.modules.localforage.component;
-
 describe('localForage API', function() {
-    // If this test is failing, you are likely missing the Promises polyfill,
-    // installed via bower. Read more here:
     // https://github.com/mozilla/localForage#working-on-localforage
     it('has Promises available', function() {
-        if (componentBuild) {
-            expect(require('promise')).to.be.a('function');
-        } else {
-            expect(Promise).to.be.a('function');
-        }
+        expect(Promise).to.be.a('function');
     });
@@ -870,6 +860,4 @@ });
         var localforage3 = null;
-        var Promise;
 
         before(function(done) {
-            Promise = window.Promise || require('promise');
 
@@ -1135,8 +1123,3 @@ prepareStorage('storage2').then(function() {
         var _oldReady;
-        var Promise;
 
-        before(function() {
-            Promise = window.Promise || require('promise');
-        });
-
         beforeEach(function(done) {
@@ -1143,0 +1126,0 @@ _oldReady = localforage.ready;

test/test.datatypes.js

 /* global before:true, beforeEach:true, describe:true, expect:true, it:true */
-var DRIVERS = [
-    localforage.INDEXEDDB,
-    localforage.LOCALSTORAGE,
-    localforage.WEBSQL
-];
 
-// Abstracts constructing a Blob object, so it also works in older
-// browsers that don't support the native Blob constructor. (i.e.
-// old QtWebKit versions, at least).
-function _createBlob(parts, properties) {
+// kinda lame to define this twice, but it seems require() isn't available here
+function createBlob(parts, properties) {
+    /* global BlobBuilder,MSBlobBuilder,MozBlobBuilder,WebKitBlobBuilder */
     parts = parts || [];
@@ -20,7 +14,7 @@ properties = properties || {};
         }
-        var BlobBuilder = window.BlobBuilder ||
-            window.MSBlobBuilder ||
-            window.MozBlobBuilder ||
-            window.WebKitBlobBuilder;
-        var builder = new BlobBuilder();
+        var Builder = typeof BlobBuilder !== 'undefined' ? BlobBuilder :
+            typeof MSBlobBuilder !== 'undefined' ? MSBlobBuilder :
+                typeof MozBlobBuilder !== 'undefined' ? MozBlobBuilder :
+                    WebKitBlobBuilder;
+        var builder = new Builder();
         for (var i = 0; i < parts.length; i += 1) {
@@ -33,2 +27,8 @@ builder.append(parts[i]);
 
+var DRIVERS = [
+    localforage.INDEXEDDB,
+    localforage.LOCALSTORAGE,
+    localforage.WEBSQL
+];
+
 DRIVERS.forEach(function(driverName) {
@@ -329,3 +329,3 @@ if ((!localforage.supports(localforage.INDEXEDDB) &&
 
-                var testBlob = _createBlob(fileParts, { 'type' : mimeString });
+                var testBlob = createBlob(fileParts, { 'type' : mimeString });
 
@@ -362,3 +362,3 @@ localforage.setItem('blob', testBlob, function(err, blob) {
 
-                var testBlob = _createBlob(fileParts, { 'type' : mimeString });
+                var testBlob = createBlob(fileParts, { 'type' : mimeString });
 
@@ -365,0 +365,0 @@ localforage.setItem('blob', testBlob, function(err, blob) {

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Found 1 instance in 1 package

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Quality

This package contains minified code. This may be harmless in some cases where minified code is included in packaged libraries, however packages on npm should not minify code.

Found 1 instance in 1 package

Fixed alerts

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Improved metrics

Total package byte prevSize

923833

increased by0.9%

Lines of code

12659

increased by4.32%

Worsened metrics

Dev dependency count

35

increased by29.63%

Number of package files

82

decreased by-2.38%

Number of low quality alerts

3

increased byInfinity%

Number of lines in readme file

269

decreased by-12.38%

Number of low supply chain risk alerts

19

increased by111.11%

Dependency changes

• + Addedlie@3.0.2

• + Addedacorn@1.2.2(transitive)

• + Addedamdefine@1.0.1(transitive)

• + Addedast-types@0.8.15(transitive)

• + Addedbase62@0.1.1(transitive)

• + Addedcore-util-is@1.0.3(transitive)

• + Addedes3ify@0.1.4(transitive)

• + Addedesmangle-evaluator@1.0.1(transitive)

• + Addedesprima-fb@15001.1001.0-dev-harmony-fb3001.1.0-dev-harmony-fb(transitive)

• + Addedfalafel@1.2.0(transitive)

• + Addedforeach@2.0.6(transitive)

• + Addedimmediate@3.0.6(transitive)

• + Addedinherits@2.0.4(transitive)

• + Addedinline-process-browser@1.0.0(transitive)

• + Addedisarray@0.0.1(transitive)

• + Addedjstransform@3.0.0(transitive)

• + Addedlie@3.0.2(transitive)

• + Addedobject-keys@1.1.1(transitive)

• + Addedprivate@0.1.8(transitive)

• + Addedreadable-stream@1.0.34(transitive)

• + Addedrecast@0.10.43(transitive)

• + Addedsource-map@0.1.310.5.7(transitive)

• + Addedstring_decoder@0.10.31(transitive)

• + Addedthrough@2.3.8(transitive)

• + Addedthrough2@0.6.5(transitive)

• + Addedunreachable-branch-transform@0.3.0(transitive)

• + Addedxtend@4.0.2(transitive)

• - Removedpromise@^5.0.0

• - Removedasap@1.0.0(transitive)

• - Removedpromise@5.0.0(transitive)