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| layout: post |
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| title: PouchDB 2.2.0 |
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| author: Dale Harvey |
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| --- |
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| [PouchDB 2.2.0](https://github.com/daleharvey/pouchdb/releases/tag/2.2.0) is now released! Please [file issues](https://github.com/daleharvey/pouchdb/issues) or [tell us what you think](https://github.com/daleharvey/pouchdb/blob/master/CONTRIBUTING.md#get-in-touch). We would also like to give a huge thanks to our [new and existing contributors](https://github.com/daleharvey/pouchdb/graphs/contributors?from=2014-04-01&to=2014-05-01). |
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| {% include alert_start.html variant="warning"%} |
| We have removed the ES5 shims from PouchDB. If you require support for older browsers, it can be included from <a href='https://github.com/es-shims/es5-shim'>https://github.com/es-shims/es5-shim</a>. |
| {% include alert_end.html %} |
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| ### Major Changes: |
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| * Fix replication for large databases ([#1954](https://github.com/pouchdb/pouchdb/issues/1954)) |
| * Persistent map/reduce ([#1658](https://github.com/pouchdb/pouchdb/issues/1658)) |
| * Fix experimental `.sync()` API ([#1696](https://github.com/pouchdb/pouchdb/issues/1696)) |
| * `.replication()` API switched to an `EventEmitter` ([#1916](https://github.com/pouchdb/pouchdb/issues/1916)) |
| * `.changes()` API switched to an `EventEmitter` ([#1768](http://github.com/daleharvey/pouchdb/issues/1768)) |
| * Experimental LevelDB-based LocalStorage adapter ([#44](http://github.com/daleharvey/pouchdb/issues/44)) |
| * Performance improvements ([#1869](http://github.com/daleharvey/pouchdb/issues/1869), [#1871](http://github.com/daleharvey/pouchdb/issues/1871), [#1889](https://github.com/pouchdb/pouchdb/pull/1889), [#1897](https://github.com/pouchdb/pouchdb/pull/1897), [#1990](https://github.com/pouchdb/pouchdb/issues/1990)) |
| * Remove ES5 shims ([#1753](http://github.com/daleharvey/pouchdb/issues/1753)) |
| * Performance tests ([#113](http://github.com/daleharvey/pouchdb/issues/113)) |
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| ###### [Complete list of changes](https://github.com/daleharvey/pouchdb/compare/2.1.0...2.2.0) |
