Apollo-server: Unable to use registerServer with Typescript and Apollo Server 2

[majelbstoat]

Following the documentation for Apollo Server 2, there are errors when using registerServer and Typescript

import { ApolloServer } from 'apollo-server'
import express from 'express'
import { registerServer } from 'apollo-server-express'

const server = new ApolloServer({ // config })
const app = express()
registerServer({ server, app })

Gives the following error:

 [tsl] ERROR in /app/server/index.ts(62,16)
       TS2345: Argument of type '{ server: ApolloServer; app: Express; }' is not assignable to parameter of type 'ServerRegistration'.
   Types of property 'server' are incompatible.
     Type 'ApolloServer' is not assignable to type 'ApolloServerBase<Request>'.
       Types have separate declarations of a private property 'schema'.

apollo-server 2.0.0-beta4
apollo-server-express 2.0.0-beta3

Temporary workaround is:

const server = new ApolloServer({}) as any

[evans]

Super odd, we have that in the test, which are typescript, here. What's inside of your tsconfig?

Would love a PR with a failing test inside of the apollo-server package if you can manage!

[majelbstoat]

Yeah, it's very weird, because clicking into the definition takes me directly to ApolloServerBase 🤔.

Full tsconfig.json:

{
  "compileOnSave": false,
  "compilerOptions": {
    "declaration": false,
    "allowSyntheticDefaultImports": true,
    "esModuleInterop": true,
    "lib": ["es2015", "es2016"],
    "module": "commonjs",
    "moduleResolution": "node",
    "noFallthroughCasesInSwitch": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "outDir": "dist/",
    "skipLibCheck": true,
    "sourceMap": true,
    "strict": true,
    "target": "es5",
    "typeRoots": ["./node_modules/@types", "./app/@types"]
  },
  "exclude": ["lib/editor"]
}

Typescript 2.9.1.

[evans]

This should be fixed after #1161

[timohermans]

I'm experiencing this issue with ^2.13.0 versions:

TS2345: Argument of type 'typeof ApolloServer' is not assignable to parameter of type 'new (Config: any) => ApolloServerBase'.
  Type 'ApolloServer' is not assignable to type 'ApolloServerBase'.
    Types have separate declarations of a private property 'logger'.

[jhanschoo]

@timohermans Can you open a separate issue referencing this?

[jabbar86]

Downgrading to

{
  "apollo-server-express": "2.9.13",
  "apollo-server-testing": "2.9.13
}

works for me.

[sgentile]

Not sure why downgrading constitutes it being closed - this fails when trying to use Apollo server version 2 - trying to pass express app into applyMiddleware

server.applyMiddleware({ app, path });

[milenkovic]

Same here.
Versions:

"apollo-server-express": "^2.19.1",<br>
"express": "^4.17.1",

Implementation:
``const app = express(); const server = new ApolloServer({ typeDefs }); server.applyMiddleware({ app }); app.listen(port, (err: Error) => { if (err) { logger.error('something bad happened', err); } else { logger.info(server is listening on: ${port}`);
}
});

Error:

Type 'Express' is not assignable to type 'Application'.
Types of property 'engine' are incompatible...
```

[ransfordarthurjr]

Adding the object keys for applyMiddleware values solved it for me

instead of

...
const expressServer: express.Application = express();
...
const path: string = 'graphql';
apolloServer.applyMiddleware({ expressServer, path });
...

Do this (notice the object key-value pairs in the applyMiddleware object, not the just values)

...
const expressServer: express.Application = express();
...
const path: string = 'graphql';
apolloServer.applyMiddleware({ app: expressServer, path: path });
...

package.json

"apollo-server-express": "^2.19.1",
"express": "^4.17.1"

[atkinchris]

For me, this was due to mismatched @types/express across my application. I'm using [email protected] and [email protected] (the latest versions of both on npm, at the time of writing).

[email protected] uses @types/[email protected] (introduced in https://github.com/apollographql/apollo-server/commit/68043d377ec1a77bc2fcc8a4322186124abb734a). All other packages I'm using, including transitive dependencies of apollo-server-express and my root dependency of @types/express are all using @types/[email protected] (matching the express version).

[loudmouth]

@atkinchris's solution worked for me.

Thanks for saving the day!

[glasser]

I'm not sure if this is precisely that issue, but I definitely discovered in our app that some of the express-related DefinitelyTyped (@types) packages made backwards-incompatible changes and I needed to upgrade a bunch of them in parallel instead of just one. (Their deps on each other use very vague version specs, like * or something.)