I want to typeorm query builder to add custom method to it:

import { Column, Entity, PrimaryGeneratedColumn } from 'typeorm'

@Entity()
export class User {
  @PrimaryGeneratedColumn('uuid')
  id!: string

  @Column()
  name!: string
}

export const AppDataSource = new DataSource({
  ...config,
  entities: [User],
})

now I want to extend QueryBuilder and add some custom method to it

import { SelectQueryBuilder } from 'typeorm'

class CustomUserQueryBuilder extends SelectQueryBuilder<User> {
  constructor() {
    super(AppDataSource.createQueryBuilder())
    this.from(User, 'user')
  }
  async customLeftJonAndSelect() {
    return this.where(`...`)
  }
}

const customQb = new CustomUserQueryBuilder()
customQb.select('*').customLeftJonAndSelect().getQuery()

Problem is it keeps giving me this error:

EntityMetadataNotFoundError: No metadata for "User" was found: this.from(User, 'user')
                                                                        ^

I really appreciate If anyone can help me how to acheive this or any idea on what am I doing wrong