How to define class to model in TypeScript

export class ItemsComponent implements OnInit {
    testing: Array<inventory>;    
    ngOnInit() {
        this.testing = [
            new inventory({
                accountName: '',
                accountCode: '',
                items: [
                    new item({
                        itemCode: 'test',
                        itemName: 'testing',
                    }),
                    new item({
                        itemCode: 'test1',
                        itemName: 'testing1',
                    })
                ]
            }),
            new inventory({
                accountName: '1123',
                accountCode: '1414',
                items: [
                    new item({
                        itemCode: 'fe',
                        itemName: 'testi23ng',
                    }),
                    new item({
                        itemCode: 'tes4t1',
                        itemName: 'testi42ng1',
                    })
                ]
            })
        ];
    }
}

export class inventory{
    accountName: string;
    accountCode: string;
    items: Array<item>;
    constructor(data?: inventory) {
        if (data) {
            for (var property in data) {
                if (data.hasOwnProperty(property))
                    (<any>this)[property] = (<any>data)[property];
            }
        }
    }
}
export class item {
    itemName: string;
    itemCode: string;
    constructor(data?: item) {
        if (data) {
            for (var property in data) {
                if (data.hasOwnProperty(property))
                    (<any>this)[property] = (<any>data)[property];
            }
        }
    }
}