diff --git a/packages/core/src/config.ts b/packages/core/src/config.ts
new file mode 100644
index 0000000..c438fb3
--- /dev/null
+++ b/packages/core/src/config.ts
@@ -0,0 +1 @@
+export const SESSION_COOKIE = "session";
diff --git a/packages/core/vitest.config.ts b/packages/core/vitest.config.ts
new file mode 100644
index 0000000..b83f875
--- /dev/null
+++ b/packages/core/vitest.config.ts
@@ -0,0 +1,17 @@
+import { defineConfig } from "vitest/config";
+import { fileURLToPath, URL } from "node:url";
+
+export default defineConfig({
+  test: {
+    globals: true,
+    coverage: {
+      provider: "v8",
+      reportsDirectory: "./tests/coverage",
+    },
+  },
+  resolve: {
+    alias: {
+      "@": fileURLToPath(new URL("./src", import.meta.url)),
+    },
+  },
+});