fix: last_seq lost if no changes

Author: patriciagarcia

packages/pouchdb-adapter-asyncstorage/src/changes.js

@@ -45,15 +45,18 @@ export default function (db, api, opts) {
       return true
     })
 
-    if (filterSeqs.length === 0) return complete(null, {results: []})
+    if (filterSeqs.length === 0) return complete(null, {last_seq: lastSeq, results: []})
 
     db.storage.multiGet(toSequenceKeys(filterSeqs), (error, dataDocs) => {
       if (error) return complete(error)
 
       const filterDocs = filterDocIds
         ? dataDocs.filter(doc => filterDocIds.has(doc._id))
         : dataDocs.filter(doc => !doc._id.startsWith('_local'))
-      if (filterDocs.length === 0) return complete(null, {results: []})
+      if (filterDocs.length === 0) {
+        const seq = filterDocIds ? 0 : lastSeq
+        return complete(null, {last_seq: seq, results: []})
+      }
 
       const changeDocIds = [...new Set(
         filterDocs.map(data => forDocument(data._id)))]