TS2339: Property 'upsert' does not exist on type 'Database<{}>'.

[pejman1]

Using upsert plugin throw this error in Typescript
TS2339: Property 'upsert' does not exist on type 'Database<{}>'.

how can I solve this issue ?

[HeikoKanzler]

I had to install the types for pouchdb-upsert:
npm install @types/pouchdb-upsert