// prodcut entity: @Entity() export class ProductEntity{

    @PrimaryGeneratedColumn()
    public id: number;
    
    @Column()
    public Name: string;

    @ManyToMany(() => Features, (feature: Features) => feature.product)
    @JoinTable({name: "productFeature"})
    public features: Features[];  
}

// features entity

@Entity() export class Features{

@PrimaryGeneratedColumn()
public id: number;

@Column()
NameFeatures: string;

@Column({ 
    // nullable:false
})
public groupId: number;
@ManyToOne(() => Group,  group => group.features,{cascade:true})
group: Group

@ManyToMany(() => ProductEntity, product => product.features)
public product: ProductEntity