added availability

vitest.config.ts

@@ -0,0 +1,18 @@
+import { defineConfig } from "vitest/config";
+import path from "node:path";
+
+export default defineConfig({
+  test: {
+    environment: "node",
+    setupFiles: ["./test/setup.ts"],
+    env: { NODE_ENV: "test" },
+    globals: false,
+    include: ["test/**/*.test.ts", "src/**/*.test.ts"],
+    pool: "forks",
+    fileParallelism: false,
+    sequence: { concurrent: false },
+  },
+  resolve: {
+    alias: { "@": path.resolve(__dirname, "src") },
+  },
+});