Vercel/Serverless broken after apollo-server upgrade on develop

[electerious]

🐞 Describe the bug

The Vercel deployment is broken after upgrading apollo-server-lambda to version 3 (maybe other serverless solutions are broken, too). The code seems to be correct according to the Apollo docs, but the serverless function is throwing the following error when /api gets called:

[POST] /api
19:28:08:34
2022-01-09T18:28:10.719Z	2014d7ba-295d-4344-a94a-007608d4788b	ERROR	Invoke Error 	{"errorType":"Error","errorMessage":"Unable to determine event source based on event.","stack":["Error: Unable to determine event source based on event.","    at getEventSourceNameBasedOnEvent (/var/task/node_modules/@vendia/serverless-express/src/event-sources/utils.js:88:9)","    at proxy (/var/task/node_modules/@vendia/serverless-express/src/configure.js:38:51)","    at handler (/var/task/node_modules/@vendia/serverless-express/src/configure.js:99:12)","    at Object.handler (/var/task/node_modules/apollo-server-lambda/dist/ApolloServer.js:51:27)"]}

⚙️ Environment

• Installation: Vercel
• Ackee version: develop

[electerious]

Related: apollographql/apollo-server#6005

apollo-server-lambda is designed to be run on Lambda. Vercel is not Lambda

[tkw1536]

Is there any particular reason for not staying on apollo-server-lambda==v2.25.3 (or whatever the latest 2.x version is)?