urban-filehub/packages/server/_db.js

import PouchDB from 'pouchdb'
import PouchDBfind from 'pouchdb-find'

// adding plugin for index
PouchDB.plugin(PouchDBfind)

// create database
const pouchdb = new PouchDB('./../storage/database', {
    revs_limit: 5
})

// create fields for index
const fields = [
    'type',
    'name'
]

// adding index 
try {
    await pouchdb.db.createIndex({
        index: {
            fields: fields
        }
    })
} catch (error) {
    console.log(error);
}