diff --git a/utils.ts b/utils.ts
index dcc66a0..8f7a6b2 100644
--- a/utils.ts
+++ b/utils.ts
@@ -1,8 +1,13 @@
 import { createDefine } from 'fresh'
+import { Session } from ':src/session/mod.ts'
+import { asset } from 'fresh/runtime'
 
-// deno-lint-ignore no-empty-interface
 export interface State {
 	skipMiddlewares?: true
+	session?: Session
 }
 
 export const define = createDefine<State>()
+
+export const BUILD_ID = new URL(asset('/assets/favicon.ico'), 'http://null/')
+	.searchParams.get('__frsh_c')!