Book Image

TypeScript 2.x By Example

By : Sachin Ohri
Book Image

TypeScript 2.x By Example

By: Sachin Ohri

Overview of this book

The TypeScript language, compiler, and open source development toolset brings JavaScript development up to the enterprise level. It allows you to use ES5, ES6, and ES7 JavaScript language features today, including classes, interfaces, generics, modules, and more. Its simple typing syntax enables building large, robust applications using object-oriented techniques and industry-standard design principles. This book aims at teaching you how to get up and running with TypeScript development in the most practical way possible. Taking you through two exciting projects built from scratch, you will learn the basics of TypeScript, before progressing to functions, generics, promises, and callbacks. Then, you’ll get to implement object-oriented programming as well as optimize your applications with effective memory management. You’ll also learn to test and secure your applications, before deploying them. Starting with a basic SPA built using Angular, you will progress on to building, maybe, a Chat application or a cool application. You’ll also learn how to use NativeScript to build a cool mobile application. Each of these applications with be explained in detail, allowing you to grasp the concepts fast. By the end of this book, you will have not only built two amazing projects but you will also have the skills necessary to take your development to the next level.
Table of Contents (11 chapters)

Linting an Angular application

If there is one feature in Angular CLI which is my favorite, then linting is the one. Angular CLI integrates with the tslint JSON file and allows us to run the linting rules on our code base and help make sure we are following the style guides and the best practices defined for our project.

The command for running the linting on our code base is shown here:

ng lint

The Angular CLI on this command will run through our code base and check whether there are any violations based on the rules defined.

Linting rules

In an Angular CLI project, when the project is generated, the CLI adds a file with the name tslint.json. This file contains all the recommended rules for writing TypeScript code.

The following...