TypeGraphQL file upload mutation resolver returning null

[aseerkt]

// PostResolver.ts

import { createWriteStream } from 'fs';
import { FileUpload, GraphQLUpload } from 'graphql-upload';

@Mutation(() => Boolean)
@UseMiddleware(isAuth)
async addPost(
  @Arg('file', () => GraphQLUpload)
  file: FileUpload
): Promise<boolean> {
  const { filename, createReadStream } = await file;
  const uploadTime = new Date().toISOString();
  const pathName = path.join(
    __dirname,
    `../images/${uploadTime}_${filename}`
  );
  const writeStream = createWriteStream(pathName);

  const isUploaded: boolean = await new Promise(async (res, rej) =>
    createReadStream()
      .pipe(writeStream)
      .on('close', () => {
        console.log('closed');
        res(true);
      })
      .on('error', (err) => {
        console.log(err);
        rej(false);
      })
  );

  console.log(isUploaded); // logs true
  return isUploaded; // resolves to null
}

File Upload is complete and isUploaded logged as true, But resolver returning null.
Here is the github code https://github.com/aseerkt/apollo-instagram-clone

[MichalLytek]

If it logs true but resolves to null, maybe you have a typo in res.data.prooperty or the server returns also errors, so the response data is null.

[aseerkt]

I came to realise that the problem is due to the isAuth middleware I used within UseMiddleware decorator,

import { AuthenticationError } from 'apollo-server-express';
import { MiddlewareFn } from 'type-graphql';
import { User } from '../entities/User';
import { MyContext } from '../types';

export const isAuth: MiddlewareFn<MyContext> = async (
  { context: { req } },
  next
) => {
  const { userId } = req.session;
  if (!userId) {
    console.log('Something is wrong');
    throw new AuthenticationError('Unauthorized');
  }

  const user = await User.findOne({ id: userId });
  if (!user) {
    console.log('Something is wrong');
    throw new AuthenticationError('Unauthorized');
  }
  next();
};

[MichalLytek]

it should be return next() 😉