		export class Store {
		readonly _dbp: Promise<IDBDatabase>;
		private _dbp: Promise<IDBDatabase>;

		constructor(dbName = 'keyval-store', readonly storeName = 'keyval') {
		this._dbp = new Promise((resolve, reject) => {
		const openreq = indexedDB.open(dbName, 1);
		const connection = (version?: number): Promise<IDBDatabase> => new Promise((resolve, reject) => {
		const openreq = indexedDB.open(dbName, version);
		openreq.onerror = () => reject(openreq.error);
		openreq.onsuccess = () => resolve(openreq.result);
		openreq.onsuccess = () => {
		// If a later version of this database wants to open,
		// close and create a new connection for the new version.
		openreq.result.onversionchange = () => {
		openreq.result.close();
		this._dbp = connection();
		}
		// If this database has been opened before, but never with this
		// storeName, the objectStore won't exist yet. In which case,
		// force an upgrade by opening a connection with version n+1.
		if (!openreq.result.objectStoreNames.contains(storeName)) {
		resolve(connection(openreq.result.version + 1));
		}
		else {
		resolve(openreq.result);
		}
		}

		@@ -15,2 +31,4 @@ // First time setup: create an empty object store
		});

		this._dbp = connection();
		}
		@@ -66,3 +84,3 @@
		// And openKeyCursor isn't supported by Safari.
		(store.openKeyCursor \|\| store.openCursor).call(store).onsuccess = function() {
		(store.openKeyCursor \|\| store.openCursor).call(store).onsuccess = function () {
		if (!this.result) return;
		@@ -69,0 +87,0 @@ keys.push(this.result.key);

package.json

		{
		"name": "idb-keyval",
		"version": "3.0.3",
		"version": "3.0.4",
		"description": "A super-simple-small keyval store built on top of IndexedDB",
		@@ -9,3 +9,5 @@ "main": "./dist/idb-keyval-cjs.js",
		"scripts": {
		"build": "del dist && rollup -c && uglifyjs --compress --mangle -o dist/idb-keyval-iife.min.js dist/idb-keyval-iife.js"
		"build": "del dist && rollup -c && npm run compress-iife && npm run compress-iife && npm run create-compat",
		"compress-iife": "uglifyjs --compress --mangle -o dist/idb-keyval-iife.min.js dist/idb-keyval-iife.js",
		"create-compat": "babel dist/idb-keyval-iife.js \| uglifyjs --compress --mangle > dist/idb-keyval-iife-compat.min.js"
		},
		@@ -35,2 +37,4 @@ "repository": {
		"devDependencies": {
		"babel-cli": "^6.26.0",
		"babel-preset-env": "^1.6.1",
		"del-cli": "^1.1.0",
		@@ -37,0 +41,0 @@ "rollup": "^0.56.5",

README.md

		@@ -8,3 +8,3 @@ # IDB-Keyval

		[localForage](https://github.com/localForage/localForage) offers similar functionality, but supports older browsers with broken/absent IDB implementations. Because of that, it's 7.4k, whereas idb-keyval is ~550 bytes. Also, it's tree-shaking friendly, so you'll probably end up using fewer than 450 bytes. Pick whichever works best for you!
		[localForage](https://github.com/localForage/localForage) offers similar functionality, but supports older browsers with broken/absent IDB implementations. Because of that, it's 7.4k, whereas idb-keyval is < 600 bytes. Also, it's tree-shaking friendly, so you'll probably end up using fewer than 500 bytes. Pick whichever works best for you!

		@@ -103,2 +103,4 @@ This is only a keyval store. If you need to do more complex things like iteration & indexing, check out [IDB on NPM](https://www.npmjs.com/package/idb) (a little heavier at 1.7k). The first example in its README is how to recreate this library.
		* `dist/idb-keyval-iife.js` can be used in browsers that don't support modules. `idbKeyval` is created as a global.
		* `dist/idb-keyval-iife.min.js` As above, but minified.
		* `dist/idb-keyval-iife-compat.min.js` As above, but works in older browsers such as IE 10.

		@@ -105,0 +107,0 @@ ## Updating from 2.x

idb-keyval - npm Package Compare versions

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