December 2016
Intermediate to advanced
841 pages
17h
English
Content preview from TypeScript: Modern JavaScript DevelopmentBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 8. Decorators
In this chapter, you are going to learn about annotations and decorators—the two new features based on the future ECMAScript 6 specification, but we can use them today with TypeScript 1.5.
You will learn about the following topics:
- Annotations and decorators:
- Class decorators
- Method decorators
- Property decorators
- Parameter decorators
- Decorator factory
- Decorators with parameters
- The reflection metadata API
Prerequisites
The TypeScript features in this chapter require TypeScript 1.5 or higher. We can use Gulp as we have done in previous chapters, but we need to ensure that the latest version of TypeScript is used by the gulp-typescript package. Let's start by creating a package.json file and installing the required packages:
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.