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An Introduction to TypeScript: Static Typing for the Web. This article was peer reviewed by Julian Motz and Ryan Chenkie. Thanks to all of SitePoint’s peer reviewers for making SitePoint content the best it can be! “Oh, I’m using Gulp because of reason A” or “Oh, I’m using Redux because of reason B”. You hear these sorts of things from front-end developers all the time. It’s become fashionable to use new ways of improving on JavaScript’s old faults and that’s not a bad thing; even ES2015 has been a pretty determined attempt at righting those wrongs and it’s currently the official version of the language. One of those attempts at creating a better experience with JavaScript, which we’ll dive into here, is TypeScript. It’s a promising change to our favorite language that’s likely to make a bigger splash in JavaScript’s future.

What Exactly is TypeScript? TypeScript is a strongly-typed superset of JavaScript, which means it adds some syntactical benefits to the language while still letting you write normal JavaScript if you want to. External Typings. Nay's Journal. Tutoriel Vidéo Javascript TypeScript. Le TypeScript est un langage de programmation open-source développé par Microsoft. Le langage se présente comme un sur-ensemble du JavaScript avec notemment l'apport d'un typage statique optionnel des variables et des fonctions, la création de classes et d'interfaces, la création de namespace et de modules.

Installation Pour commencer à expérimenter avec le TypeScript vous pouvez utiliser le playground. Si vous souhaitez utiliser TypeScript pour vos projets vous pouvez installer le transpiler via npm : npm i -g typescript Cette installation vous donnera accès à la commande tsc qui vous permettra de transpiler votre code en JavaScript (ES3, ES5 ou ES2015). tsc index.ts Si vous souhaitez transpiler pour le web il vous faudra passer par webpack ou browserify avec l'utilisation de plugin ou de loaders.

Typage Comme son nom l'indique le TypeScript va vous permettre de définir le type de vos variables, paramètres et retours de fonctions. Les Classes Les Namespaces Les modules. TypeScript, WTF?! If you hang around in the JavaScript community, along with left-pad you almost have certainly heard of TypeScript. Having large frameworks, like Angular 2 and EmberJS embrace it have given it a lot of focus. I would like to think too, that Dojo 2 being built on TypeScript adds something to the conversation and I would like to explain in part why you might want to spend time getting to understand TypeScript as well.

Microsoft, Bleurgh I remember hearing the announcement of TypeScript from Microsoft and immediately dismissed it. I generally did that with most things from Microsoft. They were in my eyes, like a lot of large software enterprises, a good place to crush innovation and focus on brand and marketing. I was totally wrong. Fanboy Moment Part of the understanding of why TypeScript is different, in my opinion, I have to self a bit of fanboyness for a moment. It Ain’t Pretty, But It’s All We Got I Don’t Understand function myGreatApi(options) { } Openness Hook Finally... About Kitson Kelly. Writing Angular 2 in TypeScript. A few months ago we migrated Angular 2 to TypeScript. Although there are still some rough edges, I am happy with our decision to do it.

Today I want to share my experience of working with TypeScript: how it affects the way I write and refactor my code. I like TypeScript, but you don’t have to. Even though Angular 2 is written in TypeScript, you don’t have to use it to write Angular 2 applications. The framework also works great with ES5, ES6, and Dart. TypeScript Has Great Tools The biggest selling point of TypeScript is tooling. TypeScript is not the only typed language that compiles to JavaScript. Even though the TypeScript code editing experience is a huge improvement over ES5 and ES6, at the moment it is not as robust as, let’s say, writing Java in IntelliJ IDEA.

The Future of TypeScript The fact that intellisense and basic refactorings (e.g., rename a symbol) are reliable makes a huge impact on the process of writing and especially refactoring code. Yes, I know it is hard to believe.