add flags to NextApiHandler and WrappedNextApiHandler types

Author: lobsterkatie

packages/nextjs/src/utils/withSentry.ts

@@ -28,8 +28,18 @@ import { NextApiRequest, NextApiResponse } from 'next';
 // the test app would refer to the other version of the type (from the test app's `node_modules`). By using a custom
 // version of the type compatible with both the old and new official versions, we can use any Next version we want in
 // a test app without worrying about type errors.
-type NextApiHandler = (req: NextApiRequest, res: NextApiResponse) => void | Promise<void> | unknown | Promise<unknown>;
-export type WrappedNextApiHandler = (req: NextApiRequest, res: NextApiResponse) => Promise<void> | Promise<unknown>;
+
+// TODO: fix the comments above and explain extra properties
+export type NextApiHandler = {
+  __sentry_route__?: string;
+  (req: NextApiRequest, res: NextApiResponse): void | Promise<void> | unknown | Promise<unknown>;
+};
+
+export type WrappedNextApiHandler = {
+  __sentry_route__?: string;
+  __sentry_wrapped__?: boolean;
+  (req: NextApiRequest, res: NextApiResponse): Promise<void> | Promise<unknown>;
+};
 
 export type AugmentedNextApiResponse = NextApiResponse & {
   __sentryTransaction?: Transaction;