Function sc_consensus_beefy::beefy_block_import_and_links

pub fn beefy_block_import_and_links<B, BE, RuntimeApi, I, AuthorityId>(
    wrapped_block_import: I,
    backend: Arc<BE>,
    runtime: Arc<RuntimeApi>,
    prometheus_registry: Option<Registry>,
) -> (BeefyBlockImport<B, BE, RuntimeApi, I, AuthorityId>, BeefyVoterLinks<B, AuthorityId>, BeefyRPCLinks<B, AuthorityId>)
where
    B: Block,
    BE: Backend<B>,
    I: BlockImport<B, Error = Error> + Send + Sync,
    RuntimeApi: ProvideRuntimeApi<B> + Send + Sync,
    RuntimeApi::Api: BeefyApi<B, AuthorityId>,
    AuthorityId: AuthorityIdBound,

Make block importer and link half necessary to tie the background voter to it.