JSFiddle - React, Tailwind, and code Playground

TypeScript

class Item {
    public id: int;

    private _someString: int;
    public get someString(): string {
    		return 2;//'Sone string';
        if (!this._someString)
        		this._someString = 'Sone string';

        return this._someString;
    }
}

const item:Item = { id: 1 };
document.body.innerHTML = item.id.toString() + ' ' + item.someString;