TypeScript
TypeScript is an open-source programming language developed and maintained by Microsoft. It is a strict syntactical superset of JavaScript and adds optional static typing to the language. TypeScript is designed for development of large applications and trans-compiles to JavaScript.
I love to use TypeScript for open source packages. It makes programming JavaScript easier and shows intent.
Conditioning Knockout Observables: reject values
Wouldn’t it be nice if we could restrict the value written to a Knockout observable? Some values might mess up your model completely while others just don’t make sense. How would one create a conditioned observable that rejects invalid values? It turns out that conditioning an observable is not so hard.
Support both Node.js and browser JS in one TypeScript file
TypeScript allows for better JavaScript development. JavaScript is getting useful in more domains. But different systems require different ways of handling modules and exposing features. TypeScript solves this by compiling differently when a target is specified.
But what if you need a TypeScript script that supports both vanilla browser JS and Node.js? What if you need to expose 10+ classes?
Convert QUnit test to Mocha / Chai
Recently I’ve been playing around with NPM. I switched my unit tests from QUnit to Mocha. This was not as straight forward as one would hope. In this blog I’ll show some example code. At the end I’ll link to a side by side comparison of the entire test project. Hopefully it helps you to convert your code. I’ll be using the Chai BDD assertion engine.
Strongly Typed Events 0.3.0 – now with Signals
Turns out that I needed an even smaller type of event: the signal. It is an event that has no data; it just fires. The Strongly Typed Events project started with the IEvent
Strongly Typed Events 0.2.0 – now with Simple Events
A while ago I started a GitHub project for Strongly Typed Events in TypeScript. I’ve uploaded the second version (0.2) with support for ISimpleEvent
Adding named events to your TypeScript classes (Part 4)
Need to add named event support to your class? Implement the IEventHandling interface or extend from the abstract EventHandlingBase class. In this tutorial I explore how you can give your class named events.
Strongly Typed Events in TypeScript using an event list (Part 3)
In this tutorial I explore how an event list can be used to support scenarios with classes with a multitude of events. There is a way to decrease the number of private backing variables using an EventList
Using strongly typed events in TypeScript with interfaces (Part 2)
In a previous tutorial I explained how events can be implemented as properties on a class using Strongly Typed Events for TypeScript. Let’s explore how these work on interfaces. Interfaces work a little different, because they don’t have getters and setters on them (at least nog in TypeScript 1.8). Let’s explore how these work on interfaces.
Strongly typed event handlers in TypeScript (Part 1)
As a C# programming I have a lot of interest in the TypeScript project. Lately I’ve been playing around with it to look what it can do. I found myself in need of some event handling, so I decided to build something that looks like the event handling .Net gives you.
