Constructor.
@ndn/repo!DataStore instance.
DataStore is declared as an interface instead of importing, in order to reduce bundle size
for webapps that do not use DataBuffer. The trade-off is that, applications wanting to use
DataBuffer would have to import @ndn/repo themselves.
Note: @ndn/repo-api!DataArray is insufficient because it lacks expireTime option.
Readonlystore@ndn/repo!DataStore instance.
DataBuffer implementation based on
@ndn/repo.