typeorm/typeorm

Hey guys, I'm having a bit of problem with ManyToMany relationship
My entities are:

@Entity()
export class Product {
    @PrimaryColumn('text')
    sku: string;

    @Column('text')
    name: string;

    @Column({ name: 'cost_price', type: 'real' })
    costPrice: number;

    @Column({ name: 'sell_price', type: 'real' })
    sellPrice: number;

    @Column('datetime', { name: 'creation_date' })
    creationDate: Date;

    @Column('datetime', { name: 'mod_date' })
    modificationDate: Date

    @ManyToMany(type => Category)
    @JoinTable({name: 'product-categories'})
    categories: Category[];

    static create = (props: Product) => {
        let product = new Product()
        product.sku = props.sku
        product.name = props.name
        product.costPrice = props.costPrice
        product.sellPrice = props.sellPrice
        product.creationDate = props.modificationDate
        product.modificationDate = props.modificationDate
        product.categories = props.categories

        return product
    }
}

@Entity()
export class Category {
    @PrimaryGeneratedColumn('rowid')
    id: string;

    @Column("text")
    name: string;

    @Column('datetime', { name: 'creation_date' })
    creationDate: Date;

    static create = (props: { name: string, creationDate: Date }) => {
        let category = new Category()
        category.name = props.name
        category.creationDate = props.creationDate
        return category
    }
}

I'm creating new rows using this bit of code:

let beverageCategory = Category.create({
  creationDate: new Date(),
  name: 'Beverage'
})
await categoryDb.save(beverageCategory)

let pepsi = Product.create({
  sku: '10000001',
  categories: [beverageCategory],
  costPrice: 2.49,
  sellPrice: 2.94,
  creationDate: new Date(),
  modificationDate: new Date(),
  name: 'Pepsi 2L'
})

await productDb.save(pepsi)

But nothing shows up in the product-categories table