Problem running apollo server after nodejs upgrade (using nestjs and fastify) - node.js

Question

I've got a problem in my NestJs app. Project was running perfect until yesterday.
Apparently my node.js upgraded from 14.16.1 to 14.17.0. So I changed this version number in my engines object, in package.json. I executed yarn install again, to make sure everything was there, and tried yarn start:dev (which translates to nest start --watch).
But my app isn't running =(
It seems like there's something wrong regarding my apollo-server-fastify:
UnhandledPromiseRejectionWarning: Error: You must `await server.start()` before calling `server.createHandler()`
at ApolloServer.assertStarted (/app/node_modules/apollo-server-fastify/node_modules/apollo-server-core/dist/ApolloServer.js:213:19)
at ApolloServer.createHandler (/app/node_modules/apollo-server-fastify/dist/ApolloServer.js:22:14)
at GraphQLModule.<anonymous> (/app/node_modules/#nestjs/graphql/dist/graphql.module.js:150:45)
at Generator.next (<anonymous>)
at /app/node_modules/tslib/tslib.js:117:75
at new Promise (<anonymous>)
at Object.__awaiter (/app/node_modules/tslib/tslib.js:113:16)
at GraphQLModule.registerFastify (/app/node_modules/#nestjs/graphql/dist/graphql.module.js:143:24)
at GraphQLModule.<anonymous> (/app/node_modules/#nestjs/graphql/dist/graphql.module.js:118:28)
at Generator.next (<anonymous>)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:323734) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 2)
(node:323734) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
I know apollo and fastify aren't the best friends right now, I've faced an issue in the past where I needed to downgrade some package, I guess. Does anyone knows how to debug/fix this? I feel clueless.
Current package versions:
"#nestjs/common": "^7.0.0",
"#nestjs/graphql": "^7.7.0",
"#nestjs/platform-fastify": "^7.6.4",
"apollo-server-fastify": "^3.0.0-alpha.3",
"graphql": "^15.5.0",
(I've also tried to upgrade apollo-server-fastify to alpha 4, but the problem persists).

Answer 1

TLDR
A temporary fix, until this issue is addressed by maintainers, is to copy this patch file into your repository, then modify your package.json to use the following:
"#nestjs/graphql": "patch:#nestjs/graphql#7.10.6#[YOUR/LOCAL/PATH]/graphql.patch"
Background
I ran into this same issue with my project. I'm not sure about the origin, but I did see that apollo-server-fastify was updated to 3.0.0-lambda.0 about 5 days ago and to 3.0.0-preview.0 a few hours ago.
I tracked the possible fix down to the registerFastify method in #nestjs/graphql. The solution, I believe, is to call await apolloServer.start() on line 228 in lib/graphql.module.ts before the Apollo Server's createHandler() method is called. I opened an issue on the repository with more details, which you can follow until resolved.
I implemented the fix in the template repository I'm working on with yarn patch #nestjs/graphql. The repository is available on the dev-nx branch at troncali/nest-vue. The patch is located in ./.yarn/patches/#nestjs/graphql.patch.