GraphQL authentication via facebook-token

PassportService.ts

export class PassportService {
  static async authFacebook(accessToken: string, context: IKoaContext) {
    // seems to be the easiest way to get the facebook token into the auth library
    // could also be passed as a faked body or query string parameter
    context.request.header.access_token = accessToken
    try {
      let returnUser: any = null;
      // its easier to use the user returned in a callback than try to promisfiy
      // this function
      await Passport.authenticate(
        'facebook-token',
        {session: false},
        (user: any) => {
          // returned user object has 'token' field which contains a JWT we'll use
          // from here on out
          returnUser = user
          // tried faking the context with the necessary parameters but
          // haven't narrowed what is actually needed yet
        })(context, (): any => {
        // faked next function
      })
      return returnUser
    } catch (err) {
      debug('E_AUTH_BAD_FACEBOOK_TOKEN', err)
      throw err
    }
  }
}

user-mutation.ts

export const authFacebook: GraphQLFieldConfig<typeof UserType, any> = {
  type: UserType,
  args: {
    accessToken: {type: GraphQLString}
  },
  async resolve(parentValue, args: IAuthFacebookArgs, context: IKoaContext) {
    return await PassportService.authFacebook(args.accessToken, context)
  }
};