Export Class Product && ManageProduct(ok)

C:\Users\Administrator\Desktop\ts\Product.ts

export class Product {
	private _id: number;
	private _name: string;
	private _price: number;
	private _description: string;
	private _state: boolean;
	private _image: string;
	constructor(id: number, name: string, price: number, description: string, state: boolean, image: string) {
		this._id = id;
		this._name = name;
		this._price = price;
		this._description = description;
		this._state = state;
		this._image = image;
	}
	public get id(): number {
		return this._id;
	}
	public set id(variable: number) {
		this._id = variable;
	}
	public get name(): string {
		return this._name;
	}
	public set name(variable: string) {
		this._name = variable;
	}
	public get price(): number {
		return this._price;
	}
	public set price(variable: number) {
		this._price = variable;
	}
	public get description(): string {
		return this._description;
	}
	public set description(variable: string) {
		this._description = variable;
	}
	public get state(): boolean {
		return this._state;
	}
	public set state(variable: boolean) {
		this._state = variable;
	}
	public get image(): string {
		return this._image;
	}
	public set image(variable: string) {
		this._image = variable;
	}
}

C:\Users\Administrator\Desktop\ts\ManageProduct.ts

import {Product} from './Product';
export class ManageProduct {
	private _products : Product[] = [];
	constructor() {
		let product1 = new Product(1,'Product Name 1', 1000,'Description Product Name 1', true, "1.jpg");
		let product2 = new Product(2,'Product Name 2', 2000,'Description Product Name 2', false, "2.jpg");
		let product3 = new Product(3,'Product Name 3', 3000,'Description Product Name 3', true, "3.jpg");
		let product4 = new Product(4,'Product Name 4', 4000,'Description Product Name 4', false, "2.jpg");
		this.addProductToCart(product1);
		this.addProductToCart(product2);
		this.addProductToCart(product3);
		this.addProductToCart(product4);
	}
	addProductToCart(product: Product): void {
		this._products.push(product);
	}
	getProduct(): string {
		let products: Product[] = this._products;
		let length = products.length;
		var html:string = "";
		for (let i:number = 0; i < length; ++i) {
			html += `
				<div class="col-md-3">
          <div class="card mb-4 shadow-sm">
            <img src="./images/${products[i].image}" alt="${products[i].image}">
            <div class="card-body">
              <p class="text-danger text-center">${products[i].price}</p>
              <p class="text-success text-center">${products[i].name}</p>
              <p class="card-text">${products[i].description}</p>
              <div class="d-flex justify-content-center align-items-center">              
                <button type="button" class=" btn btn-primary btn-sm buynow" data-idsp="${products[i].id}">Mua hàng</button>
              </div>
            </div>
          </div>
        </div>
			`;
		}
		return html;
	}
	getProductById(id: number): Product {
		let products: Product[] = this._products;
		let length = products.length;
		for (let i:number = 0; i <= length; ++i) {
			if(i == (id - 1)) {
				return products[i];
			}
		}
	}
}