NewAPIInitializer creates an APIInitializer, handling the set up of a beacon node api client using the provided host string.

NewFileInitializer validates the given path information and creates an Initializer which will use the provided state and block files to prepare the node for checkpoint sync.

APIInitializer manages initializing the beacon node using checkpoint sync, retrieving the checkpoint state and root from the remote beacon node api.

FileInitializer initializes a beacon-node database to use checkpoint sync, using ssz-encoded block and state data stored in files on the local filesystem.

Initializer describes a type that is able to obtain the checkpoint sync data (BeaconState and SignedBeaconBlock) in some way and perform database setup to prepare the beacon node for syncing from the given checkpoint.