MyFooDB.js

import FooDataSource from './FooDataSource'
import { reportError } from './utils'

export default class MyFooDB extends FooDataSource {
  async updateFields(id, fields) {
    const doc = await this.get(id)
    return this.update(id, {
      ...doc,
      ...fields
    })
  }
  
  didEncounterError(error) {
    reportError(error)
  }
}