dataSource내부 환경변수 인식 불가에 따른 db연결 실패

dataSource.ts
import { DataSource } from 'typeorm';

import { ChannelChats } from './src/entities/channelChat.entity';
import { ChannelMembers } from './src/entities/channelMembers.entity';
import { Channels } from './src/entities/channel.entity';
import { DMs } from './src/entities/dm.entity';
import { Mentions } from './src/entities/mention.entity';
import { Users } from './src/entities/user.entity';
import { WorkspaceMembers } from './src/entities/workspaceMembers.entity';
import { Workspaces } from './src/entities/workspace.entity';
import { ConfigService } from '@nestjs/config';

const configService = new ConfigService();

const test = configService.get('DB_HOST');
console.log(test)
const dataSource = new DataSource({
  type: 'mysql',
  host: '127.0.0.1',
  port: 3306,
  username: configService.get('DB_USER'),
  password: configService.get('DB_PASSWORD'),
  database: configService.get('DB_NAME'),
  entities: [
    ChannelChats,
    ChannelMembers,
    Channels,
    DMs,
    Mentions,
    Users,
    WorkspaceMembers,
    Workspaces,
  ],
  migrations: [__dirname + '/src/migrations/*.ts'],
  synchronize: false,
  logging: true,
});

출력 에러 로그

yarn seed
yarn run v1.22.19
warning ../../../../package.json: No license field
$ ts-node ./node_modules/typeorm-extension/dist/cli/index.js seed -d ./dataSource.ts
undefined !!!!!!!!!!!!!!!
Error during Data Source initialization Error: Access denied for user ''@'localhost' (using password: NO)
    at Packet.asError (/Users/jinyoung/Desktop/study/nest/nest-project/node_modules/mysql2/lib/packets/packet.js:728:17)
    at ClientHandshake.execute (/Users/jinyoung/Desktop/study/nest/nest-project/node_modules/mysql2/lib/commands/command.js:29:26)
    at PoolConnection.handlePacket (/Users/jinyoung/Desktop/study/nest/nest-project/node_modules/mysql2/lib/connection.js:478:34)
    at PacketParser.onPacket (/Users/jinyoung/Desktop/study/nest/nest-project/node_modules/mysql2/lib/connection.js:97:12)
    at PacketParser.executeStart (/Users/jinyoung/Desktop/study/nest/nest-project/node_modules/mysql2/lib/packet_parser.js:75:16)
    at Socket.<anonymous> (/Users/jinyoung/Desktop/study/nest/nest-project/node_modules/mysql2/lib/connection.js:104:25)
    at Socket.emit (node:events:513:28)
    at Socket.emit (node:domain:489:12)
    at addChunk (node:internal/streams/readable:324:12)
    at readableAddChunk (node:internal/streams/readable:297:9) {
  code: 'ER_ACCESS_DENIED_ERROR',
  errno: 1045,
  sqlState: '28000',
  sqlMessage: "Access denied for user ''@'localhost' (using password: NO)",
  sql: undefined
}
typeorm-extension seed

.env
NAME=development
DB_HOST=localhost
DB_NAME=nestdb
DB_USER=root
DB_PASSWORD=password!!!

package.json
"db:create": "ts-node ./node_modules/typeorm-extension/dist/cli/index.js db:create -d ./dataSource.ts",
    "db:drop": "ts-node ./node_modules/typeorm-extension/dist/cli/index.js db:drop -d ./dataSource.ts",
    "seed": "ts-node ./node_modules/typeorm-extension/dist/cli/index.js seed -d ./dataSource.ts",
    "schema:drop": "ts-node ./node_modules/typeorm/cli.js schema:drop",
    "schema:sync": "ts-node ./node_modules/typeorm/cli.js schema:sync",
    "db:migrate": "npm run typeorm migration:run -- -d ./dataSource.ts",
    "db:migrate:revert": "npm run typeorm migration:revert -- -d ./dataSource.ts",
    "db:create-migration": "npm run typeorm migration:create -- ./src/migrations/",
    "db:generate-migration": "npm run typeorm migration:generate -- ./src/migrations -d ./dataSource.ts"

폴더구조

- node_module
- src
- .env
- dataSource.ts
- package.json

출력에러 로그에 보시면 맨위 yarn seed 기준 5번째 줄에 undefined !!!!!! 이런 로그를 확인하실수 있으실텐대 이게 process.env.DB_NAME을 해도 이렇게 나오고 configService.get('DB_NAME')을 해도 undefined로 나오는걸로 확인해본결과 현재 환경변수가 인지가 되지않는 상태라는것을 알아챈 상태까지 왔습니다. 여기서 어떤 부분을 손보면 좋을지 궁금합니다.