Add a DefaultQueue type alias to remove the need to use sp_api::TransactionFor (#6761)

* Add DefaultQueue

* Add DefaultImportQueue to the top level of sp-consensus

substrate/primitives/consensus/common/src/import_queue.rs

@@ -40,6 +40,11 @@ use crate::{
 };
 pub use basic_queue::BasicQueue;
 
+/// A commonly-used Import Queue type.
+///
+/// This defines the transaction type of the `BasicQueue` to be the transaction type for a client.
+pub type DefaultImportQueue<Block, Client> = BasicQueue<Block, sp_api::TransactionFor<Client, Block>>;
+
 mod basic_queue;
 pub mod buffered_link;
 

substrate/primitives/consensus/common/src/lib.rs

@@ -56,6 +56,7 @@ pub use block_import::{
 };
 pub use select_chain::SelectChain;
 pub use sp_state_machine::Backend as StateBackend;
+pub use import_queue::DefaultImportQueue;
 
 /// Block status.
 #[derive(Debug, PartialEq, Eq)]