How to use the flash-store.FlashStoreSync function in flash-store

import {
  FlashStore,
  FlashStoreSync,
  VERSION,
}                   from 'flash-store'

if (VERSION === '0.0.0') {
  throw new Error('version should be set befoer publishing')
}

const store = new FlashStore()
store.destroy()

const storeSync = new FlashStoreSync()
storeSync.destroy()

console.info(`Smoke Testing v${store.version()} PASSED!`)

path.sep,
      '.wechaty',
      'puppet-padchat-cache',
      path.sep,
      token,
      path.sep,
      userId,
    )

    const baseDirExist = await fs.pathExists(baseDir)

    if (!baseDirExist) {
      await fs.mkdirp(baseDir)
    }

    this.cacheContactRawPayload    = new FlashStoreSync(path.join(baseDir, 'contact-raw-payload'))
    this.cacheRoomMemberRawPayload = new FlashStoreSync(path.join(baseDir, 'room-member-raw-payload'))
    this.cacheRoomRawPayload       = new FlashStoreSync(path.join(baseDir, 'room-raw-payload'))

    await Promise.all([
      this.cacheContactRawPayload.ready(),
      this.cacheRoomMemberRawPayload.ready(),
      this.cacheRoomRawPayload.ready(),
    ])

    const roomMemberTotalNum = [...this.cacheRoomMemberRawPayload.values()].reduce(
      (accuVal, currVal) => {
        return accuVal + Object.keys(currVal).length
      },
      0,
    )

'.wechaty',
      'puppet-padchat-cache',
      path.sep,
      token,
      path.sep,
      userId,
    )

    const baseDirExist = await fs.pathExists(baseDir)

    if (!baseDirExist) {
      await fs.mkdirp(baseDir)
    }

    this.cacheContactRawPayload    = new FlashStoreSync(path.join(baseDir, 'contact-raw-payload'))
    this.cacheRoomMemberRawPayload = new FlashStoreSync(path.join(baseDir, 'room-member-raw-payload'))
    this.cacheRoomRawPayload       = new FlashStoreSync(path.join(baseDir, 'room-raw-payload'))

    await Promise.all([
      this.cacheContactRawPayload.ready(),
      this.cacheRoomMemberRawPayload.ready(),
      this.cacheRoomRawPayload.ready(),
    ])

    const roomMemberTotalNum = [...this.cacheRoomMemberRawPayload.values()].reduce(
      (accuVal, currVal) => {
        return accuVal + Object.keys(currVal).length
      },
      0,
    )

    log.verbose('PuppetPadchatManager', 'initCache() inited %d Contacts, %d RoomMembers, %d Rooms, cachedir="%s"',

'puppet-padchat-cache',
      path.sep,
      token,
      path.sep,
      userId,
    )

    const baseDirExist = await fs.pathExists(baseDir)

    if (!baseDirExist) {
      await fs.mkdirp(baseDir)
    }

    this.cacheContactRawPayload    = new FlashStoreSync(path.join(baseDir, 'contact-raw-payload'))
    this.cacheRoomMemberRawPayload = new FlashStoreSync(path.join(baseDir, 'room-member-raw-payload'))
    this.cacheRoomRawPayload       = new FlashStoreSync(path.join(baseDir, 'room-raw-payload'))

    await Promise.all([
      this.cacheContactRawPayload.ready(),
      this.cacheRoomMemberRawPayload.ready(),
      this.cacheRoomRawPayload.ready(),
    ])

    const roomMemberTotalNum = [...this.cacheRoomMemberRawPayload.values()].reduce(
      (accuVal, currVal) => {
        return accuVal + Object.keys(currVal).length
      },
      0,
    )

    log.verbose('PuppetPadchatManager', 'initCache() inited %d Contacts, %d RoomMembers, %d Rooms, cachedir="%s"',
                                      this.cacheContactRawPayload.size,