diff --git a/src/sync/atomic-bool.ts b/src/shared/atomic-bool.ts
similarity index 100%
rename from src/sync/atomic-bool.ts
rename to src/shared/atomic-bool.ts
diff --git a/src/sync/atomic-int16.ts b/src/shared/atomic-int16.ts
similarity index 100%
rename from src/sync/atomic-int16.ts
rename to src/shared/atomic-int16.ts
diff --git a/src/sync/atomic-int32.ts b/src/shared/atomic-int32.ts
similarity index 100%
rename from src/sync/atomic-int32.ts
rename to src/shared/atomic-int32.ts
diff --git a/src/sync/atomic-int64.ts b/src/shared/atomic-int64.ts
similarity index 100%
rename from src/sync/atomic-int64.ts
rename to src/shared/atomic-int64.ts
diff --git a/src/sync/atomic-int8.ts b/src/shared/atomic-int8.ts
similarity index 100%
rename from src/sync/atomic-int8.ts
rename to src/shared/atomic-int8.ts
diff --git a/src/sync/atomic-uint16.ts b/src/shared/atomic-uint16.ts
similarity index 100%
rename from src/sync/atomic-uint16.ts
rename to src/shared/atomic-uint16.ts
diff --git a/src/sync/atomic-uint32.ts b/src/shared/atomic-uint32.ts
similarity index 100%
rename from src/sync/atomic-uint32.ts
rename to src/shared/atomic-uint32.ts
diff --git a/src/sync/atomic-uint64.ts b/src/shared/atomic-uint64.ts
similarity index 100%
rename from src/sync/atomic-uint64.ts
rename to src/shared/atomic-uint64.ts
diff --git a/src/sync/atomic-uint8.ts b/src/shared/atomic-uint8.ts
similarity index 100%
rename from src/sync/atomic-uint8.ts
rename to src/shared/atomic-uint8.ts
diff --git a/src/sync/index.ts b/src/shared/index.ts
similarity index 100%
rename from src/sync/index.ts
rename to src/shared/index.ts
diff --git a/src/sync/mutex.ts b/src/shared/mutex.ts
similarity index 100%
rename from src/sync/mutex.ts
rename to src/shared/mutex.ts
diff --git a/src/sync/reconstruct.ts b/src/shared/reconstruct.ts
similarity index 100%
rename from src/sync/reconstruct.ts
rename to src/shared/reconstruct.ts
diff --git a/src/sync/rwlock.ts b/src/shared/rwlock.ts
similarity index 100%
rename from src/sync/rwlock.ts
rename to src/shared/rwlock.ts
diff --git a/src/sync/slab.ts b/src/shared/slab.ts
similarity index 100%
rename from src/sync/slab.ts
rename to src/shared/slab.ts
diff --git a/src/transfer.ts b/src/transfer.ts
index a6073de..6e6a3fd 100644
--- a/src/transfer.ts
+++ b/src/transfer.ts
@@ -8,8 +8,8 @@ export interface Transferred<T> {
   readonly value: T;
 }
 
-export function transfer<T>(value: T): Transferred<T> {
-  return { [TRANSFER]: true as const, value };
+export function transfer<T>(value: T): T {
+  return { [TRANSFER]: true as const, value } as unknown as T;
 }
 
 export function extractTransferables(args: unknown[]): { args: unknown[]; transfer: Transferable[] } {
diff --git a/test/sync/atomic-bool.test.ts b/test/shared/atomic-bool.test.ts
similarity index 100%
rename from test/sync/atomic-bool.test.ts
rename to test/shared/atomic-bool.test.ts
diff --git a/test/sync/atomic-int16.test.ts b/test/shared/atomic-int16.test.ts
similarity index 100%
rename from test/sync/atomic-int16.test.ts
rename to test/shared/atomic-int16.test.ts
diff --git a/test/sync/atomic-int32.test.ts b/test/shared/atomic-int32.test.ts
similarity index 100%
rename from test/sync/atomic-int32.test.ts
rename to test/shared/atomic-int32.test.ts
diff --git a/test/sync/atomic-int64.test.ts b/test/shared/atomic-int64.test.ts
similarity index 100%
rename from test/sync/atomic-int64.test.ts
rename to test/shared/atomic-int64.test.ts
diff --git a/test/sync/atomic-int8.test.ts b/test/shared/atomic-int8.test.ts
similarity index 100%
rename from test/sync/atomic-int8.test.ts
rename to test/shared/atomic-int8.test.ts
diff --git a/test/sync/atomic-uint16.test.ts b/test/shared/atomic-uint16.test.ts
similarity index 100%
rename from test/sync/atomic-uint16.test.ts
rename to test/shared/atomic-uint16.test.ts
diff --git a/test/sync/atomic-uint32.test.ts b/test/shared/atomic-uint32.test.ts
similarity index 100%
rename from test/sync/atomic-uint32.test.ts
rename to test/shared/atomic-uint32.test.ts
diff --git a/test/sync/atomic-uint64.test.ts b/test/shared/atomic-uint64.test.ts
similarity index 100%
rename from test/sync/atomic-uint64.test.ts
rename to test/shared/atomic-uint64.test.ts
diff --git a/test/sync/atomic-uint8.test.ts b/test/shared/atomic-uint8.test.ts
similarity index 100%
rename from test/sync/atomic-uint8.test.ts
rename to test/shared/atomic-uint8.test.ts
diff --git a/test/sync/cross-worker.test.ts b/test/shared/cross-worker.test.ts
similarity index 100%
rename from test/sync/cross-worker.test.ts
rename to test/shared/cross-worker.test.ts
diff --git a/test/sync/mutex.test.ts b/test/shared/mutex.test.ts
similarity index 100%
rename from test/sync/mutex.test.ts
rename to test/shared/mutex.test.ts
diff --git a/test/sync/rwlock.test.ts b/test/shared/rwlock.test.ts
similarity index 100%
rename from test/sync/rwlock.test.ts
rename to test/shared/rwlock.test.ts
diff --git a/test/sync/slab.test.ts b/test/shared/slab.test.ts
similarity index 100%
rename from test/sync/slab.test.ts
rename to test/shared/slab.test.ts