diff --git a/src/backends/memory.ts b/src/backends/memory.ts
index 9b0e6061..53ba4609 100644
--- a/src/backends/memory.ts
+++ b/src/backends/memory.ts
@@ -26,7 +26,7 @@ export class InMemoryStore extends Map<Ino, Uint8Array> implements SimpleSyncSto
  * A simple in-memory file system backed by an InMemoryStore.
  * Files are not persisted across page loads.
  */
-export const _InMemory = {
+const _InMemory = {
 	name: 'InMemory',
 	isAvailable(): boolean {
 		return true;
diff --git a/src/backends/port/fs.ts b/src/backends/port/fs.ts
index 45e3a6da..9fcc1d77 100644
--- a/src/backends/port/fs.ts
+++ b/src/backends/port/fs.ts
@@ -293,7 +293,7 @@ export function detachFS(port: RPC.Port, fs: FileSystem): void {
 	RPC.detach<FileOrFSRequest>(port, request => handleRequest(port, fs, request));
 }
 
-export const _Port = {
+const _Port = {
 	name: 'Port',
 
 	options: {
@@ -315,7 +315,7 @@ export const _Port = {
 		},
 	},
 
-	async isAvailable(): Promise<boolean> {
+	isAvailable(): boolean {
 		return true;
 	},