add noop backing storage factory

Author: sokra

turbopack/crates/turbo-tasks-backend/src/lib.rs

@@ -13,7 +13,7 @@ use anyhow::Result;
 
 pub use self::{backend::TurboTasksBackend, kv_backing_storage::KeyValueDatabaseBackingStorage};
 use crate::database::{
-    handle_db_versioning, is_fresh, lmdb::LmbdKeyValueDatabase, FreshDbOptimization,
+    handle_db_versioning, is_fresh, lmdb::LmbdKeyValueDatabase, FreshDbOptimization, NoopKvDb,
     ReadTransactionCache,
 };
 
@@ -29,6 +29,12 @@ pub fn lmdb_backing_storage(path: &Path) -> Result<LmdbBackingStorage> {
     Ok(KeyValueDatabaseBackingStorage::new(database))
 }
 
+pub type NoopBackingStorage = KeyValueDatabaseBackingStorage<NoopKvDb>;
+
+pub fn noop_backing_storage(_path: &Path) -> Result<NoopBackingStorage> {
+    Ok(KeyValueDatabaseBackingStorage::new(NoopKvDb::new()))
+}
+
 pub type DefaultBackingStorage = LmdbBackingStorage;
 
 pub fn default_backing_storage(path: &Path) -> Result<DefaultBackingStorage> {