Learn React with TypeScript 3

Configuring rules

The rules that tslint uses when checking our code are configurable in a file called tslint.json. In order to explore some of the rules, we first need a TypeScript file:

1. So, let's create a file called orderDetail.ts with the following content in Visual Studio Code:

export interface Product {  name: string;  unitPrice: number;}export class OrderDetail {  product: Product;  quantity: number;  getTotal(discount: number): number {    const priceWithoutDiscount = this.product.unitPrice * this.quantity;    const discountAmount = priceWithoutDiscount * discount;    return priceWithoutDiscount - discountAmount;  }}

2. Let's now create a tslint.json file. We define the rules we want to implement in a rules field. Let's add the following rule: