In Next.js 12, when I tried to connect mongodb in middleware function in _middleware.js under /pages/api/user folder, I got this error: TypeError: mongoose__WEBPACK_IMPORTED_MODULE_0___default(...).connect is not a function at dbConnect (webpack-internal:///./src/server/utils/dbConnect.js:39:74) at Object.middleware [as handler] (webpack-internal:///./src/pages/api/user/_middleware.js:19:82) at adapter (webpack-internal:///./node_modules/next/dist/server/web/adapter.js:30:35)

part of my connection code like this:

import mongoose from "mongoose";
...
cached.promise = mongoose.connect(MONGODB_URI, opts).then((mongoose) => {
     return mongoose;
});

So I guess that Accessing Database in _middleware.js is prohibited. Am I right?