Book Image

Mastering TypeScript 3 - Third Edition

By : Nathan Rozentals
Book Image

Mastering TypeScript 3 - Third Edition

By: Nathan Rozentals

Overview of this book

TypeScript is both a language and a set of tools to generate JavaScript. It was designed by Anders Hejlsberg at Microsoft to help developers write enterprise-scale JavaScript. Starting with an introduction to the TypeScript language, before moving on to basic concepts, each section builds on previous knowledge in an incremental and easy-to-understand way. Advanced and powerful language features are all covered, including asynchronous programming techniques, decorators, and generics. This book explores many modern JavaScript and TypeScript frameworks side by side in order for the reader to learn their respective strengths and weaknesses. It will also thoroughly explore unit and integration testing for each framework. Best-of-breed applications utilize well-known design patterns in order to be scalable, maintainable, and testable. This book explores some of these object-oriented techniques and patterns, and shows real-world implementations. By the end of the book, you will have built a comprehensive, end-to-end web application to show how TypeScript language features, design patterns, and industry best practices can be brought together in a real-world scenario.
Table of Contents (16 chapters)
Free Chapter
TypeScript Tools and Framework Options

Testing our sample application

You will recall that our sample application had the following features:

  • Use a view to display a model property.
  • Construct an array of data, with each array item being a single model instance.
  • Loop through the array and render a <button> element for each item.
  • Respond to a click event on each button element.
  • Display the currently selected item.
  • Display a form with an input field, preset to a value.
  • Respond to a form submit event.

If we were to outline some of the tests that we could write, we would ideally like our tests to cover the following scenarios:

  • Model tests: These tests cover the creation and use of models within our application
  • Application state tests: These tests cover the default values or state of elements that are created
  • Rendering tests: These tests would interrogate the DOM elements that are rendered for each application element...