Converting a sequelize model class object to a seperate entity class object in typescript

Question

I have sequelize setup in my nest js project, and I have response entity classes which contain decorators from class-transformer to hide unnecessary information from responses via transformer middlewares.

I managed to write a function that can do this conversion using es2015's Object.assign

export function getEntityFromModel<T>(cls: new () => T, item: Model): T;
export function getEntityFromModel<T>(cls: new () => T, item: Model[]): T[];
export function getEntityFromModel<T>(
  cls: new () => T,
  items: Model | Model[],
): T | T[] {
  if (Array.isArray(items)) {
    const objects = items.map<T>((item) =>
      Object.assign(new cls(), item.get()),
    );
    return objects;
  } else {
    return Object.assign(new cls(), items.get());
  }
}

@Table({ tableName: 'A' })
export class ModelA extends Model<A> {
 
  @Column({ primaryKey: true, allowNull: false, type: DataType.STRING })
  id: string;

  @Column({ allowNull: false, type: DataType.STRING(20) })
  col1: string;

  @Column({ allowNull: false, type: DataType.STRING(20) })
  col2: object;
}

export class EntityA {
  id: string;
  col1: string;
  @Exclude
  col2: object;
}

getEntitiyFromModel(EntityA, modelAObj)

Now, this works as intended but the problem remains that typescript will complain about the additional keys in the Model type (also ts does not assert that cls and T should have same attributes)

Type 'EntityA' is missing the following properties from type 'ModelA': $add, $set, $get, $count, and 32 more.ts(2740)

What could be a more neater solution