Config in useFactory not injected

I’m submitting a…

[ ] Regression 
[ x ] Bug report
[ ] Feature request
[ ] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead post your question on Stack Overflow.

Current behavior

My configService is not injected into GraphQLModule.forRootAsync -> useFactory

Expected behavior

config.getArray should be a existing function

Minimal reproduction of the problem with instructions

app.module

    GraphQLModule.forRootAsync({
      imports: [
        ClientModule,
        AuthModule,
        UserModule,
        AggregationModule,
      ],
      useFactory: async (config: ConfigService) => ({
        include: [
          ClientModule,
          AuthModule,
          UserModule,
          AggregationModule,
        ],
        autoSchemaFile: 'schema.gql', // https://github.com/nestjs/graphql/issues/205
        context: (req: any) => (req),
        cors: {
          origin: config.getArray('FRONTEND_URL'),
        },
        debug: config.isDevelopment(),
        playground: config.isDevelopment(),
      }),
      inject: [ConfigService],
    }),

config.service

import { Injectable } from '@nestjs/common';
import { join } from 'path';
import * as dotenv from 'dotenv';

@Injectable()
export class ConfigService {
	constructor() {
		dotenv.config({
			path: join(__dirname, '../../.env'),
		});
	}

	getString(key: string): string {
		return process.env[key];
	}

	getBoolean(key: string): boolean {
		if ('true' === process.env[key]) {
			return true;
		}

		return false;
	}

	getArray(key: string, separator: string = ','): any[] {
		return process.env[key].split(separator);
	}

	isProduction(): boolean {
		return 'production' === process.env.ENVIRONMENT;
	}

	isDevelopment(): boolean {
		return 'development' === process.env.ENVIRONMENT;
	}
}

Before Upgrading to the newest NestJS Version this worked as expected. Now, running npm run start:dev throws a [0] [Nest] 7066 - 2019-09-27 13:55:37 [ExceptionHandler] config.getArray is not a function +33ms Exception.

What is the motivation / use case for changing the behavior?

Environment

Nest version: 6.7.2
Node Version: 12.7.0
OS: Linux
```
  "dependencies": {
    "@nestjs/common": "^6.7.2",
    "@nestjs/core": "^6.7.2",
    "@nestjs/graphql": "^6.5.2",
    "@nestjs/jwt": "^6.1.1",
    "@nestjs/mongoose": "^6.1.2",
    "@nestjs/passport": "^6.1.0",
    "@nestjs/platform-express": "^6.7.2",
    "apollo-server-express": "^2.9.4",
    "argon2": "^0.24.1",
    "class-transformer": "^0.2.3",
    "class-validator": "^0.9.1",
    "dotenv": "^8.1.0",
    "graphql": "^14.5.8",
    "graphql-tools": "^4.0.5",
    "graphql-type-json": "^0.3.0",
    "luxon": "^1.19.3",
    "mongoose": "^5.7.1",
    "ms": "^2.1.2",
    "passport": "^0.4.0",
    "passport-jwt": "^4.0.0",
    "reflect-metadata": "^0.1.12",
    "rimraf": "^2.7.1",
    "rxjs": "^6.5.3",
    "type-graphql": "^0.17.5",
    "url-parse": "^1.4.7"
  },
  "devDependencies": {
    "@nestjs/testing": "^6.7.2",
    "@types/bcrypt": "^3.0.0",
    "@types/dotenv": "^6.1.1",
    "@types/express": "^4.17.1",
    "@types/jest": "^23.3.13",
    "@types/node": "^10.14.19",
    "@types/supertest": "^2.0.7",
    "@types/url-parse": "^1.4.3",
    "concurrently": "^4.1.2",
    "jest": "^23.6.0",
    "nodemon": "^1.19.2",
    "prettier": "^1.15.3",
    "shipit-cli": "^5.1.0",
    "shipit-deploy": "^5.1.0",
    "shipit-shared": "^4.4.2",
    "supertest": "^3.4.1",
    "ts-jest": "24.0.2",
    "ts-node": "8.1.0",
    "tsconfig-paths": "3.8.0",
    "tslint": "5.16.0",
    "typescript": "3.4.3",
    "wait-on": "^3.2.0"
  },```

Others:

[kamilmysliwiec]

Fixed in 6.5.3 😃

[NateFerrero]

@kamilmysliwiec tested and fix validated! Fastest turnaround time of all time 😃