• Remove the deprecated PouchDB RxStorage.
• REMOVE old replication-couchdb plugin. Rename replication-couchdb-new to replication-couchdb.
• Remove depricated skipIfSame from putAttachment()

• CHANGE use plain json errors inside of RxError parameters to make debugging easier.
• CHANGE Make RxDocuments immutable
• ADD RxDocument.getLatest()
• CHANGE RxCollection.findByIds() now returns a RxQuery.
• REMOVED RxCollection.findByIds$, use RxCollection.findByIds().$ instead.
• CHANGE Prefix storage plugins with storage- like rxdb/plugins/storage-dexie.
• RENAME atomicUpdate() to incrementalModify()
• RENAME atomicPatch() to incrementalPatch()
• RENAME atomicUpsert() to incrementalUpsert()
• ADD RxDocument().incrementalUpdate()
• ADD RxDocument.incrementalRemove()
• ADD non-incremental RxDocument methods patch() and modify()
• ADD typings to the query selector
• CHANGE start replication via pure functions instead of RxCollection methods.

• CHANGE Do not use hash for revisions but use database instance token instead.
• CHANGE crunch multiple incremental (aka 'atomic') operations into a single database write. Also batch writes to multiple documents into a single write.
• CHANGE to reduce bundle size and improve performance, the following JavaScript features will no longer be transpiled:
  • async/await
  • Arrow functions
  • for...of
  • shorthand properties
  • Spread operator
  • destructuring
  • default parameters
  • object spread

• CHANGE (memory RxStorage) do not clean up database state on closing of the storage, only on remove().
• FIX CouchDB replication: Use correct default fetch method.
• FIX schema hashing should respect the sort order #4005
• FIX replication does not provide a ._rev to the storage write when a conflict is resolved.
• FIX(remote storage) ensure caching works properly even on parallel create-calls
• FIX(replication) Composite Primary Keys broken on replicated collections #4190
• FIX(sqlite) $in Query not working SQLite #4278
• FIX CouchDB push is throwing error because of missing revision #4299
• ADD dev-mode shows a console.warn to ensure people do not use it in production.
• Remove the usage of Buffer. We now use Blob everywhere.
• FIX import of socket.io #4307

• REMOVE deprecated babel-plugin-transform-async-to-promises plugin.

NOTICE: An overview about all releases can be found at the changelog