const { BaseDatastore } from 'datastore-core')

class MyDatastore extends BaseDatastore {
  constructor () {
    super()
  }

  async put (key, val) {
    // your implementation here
  }

  async get (key) {
    // your implementation here
  }

  // etc...
}

import { Key } from 'interface-datastore'
import {
  MemoryStore,
  MountStore
} from 'datastore-core'

const store = new MountStore({prefix: new Key('/a'), datastore: new MemoryStore()})