Firstly, when you need a type definition for a JavaScript library that you want full type information for, there is Definitely Typed. But before you grab a type definition, let’s stop and think for a minute. TypeScript does indeed bring you lots of benefits in terms of type checking, and editor features such as auto-completion […]
TypeScript has immediate and first class support for two mechanisms of code delivery. You can merge the whole application into a single output file, or you can take advantage of modules and load them asynchronously on demand. Folklore in the web industry has firmly imprinted the idea that “bundling is best” and it wouldn’t surprise […]
The Definitely Typed project is nothing short of heroic, all those type definitions that have been created for free by the community, co-ordinated by people from the community – it it a genuinely monumental effort. If you need to consume a JavaScript library from your TypeScript application, you’ll be glad that this project exists because […]
I wrote about bit flags a while ago, demonstrating that you can use an enum in TypeScript along with “powers of two” to create flags: export enum StepType { Given = 1, When = 2, Then = 4 } These can then be combined and tested using bitwise operations. var example = StepType.When | StepType.Then; […]
I have talked before about highly dynamic instantiation of classes in TypeScript, for example when you know it’s name – but a common question that keeps coming up is: Why can’t I instantiate a class based on a type argument? For example, people want to do this (this code won’t compile): class ExampleOne { hi() […]
This isn’t a “framework a” vs “framework b” post. When performing BDD, if you are using C#, you’ll be using SpecFlow… if you are using TypeScript, TypeSpec is the only option (although you can use JavaScript frameworks too, with an associated type definition). So the reason for the comparison is to see what step definitions […]
In TypeSpec, events are raised during a test run that can be intercepted by a test reporter. TypeSpec has a built-in test reporter that logs a whole bunch of information to the console. It also has a test reporter for TAP output. When these options don’t offer what you need, you can write your own […]
You have almost certainly seen this often-regurgitated “motivational” quote. It goes like this (and is often pictured on an erasable board to make it look more like it has gushed forth from a beautiful mind)… Coincidence or Not If A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z Equals 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26 Then K – N – O – W – L – […]
If you have an object in your code, and that object has some kind of measurement, you might well have done this: class Desk { constructor( public width: number, public depth: number, public height: number ) {} } But this will almost certainly lead to some issues… for example, you store your values as centimeters […]
If you want to get your TypeSpec test output in TAP (Test Anything Protocol) format, there is a built-in test reporter that will do this for you. Just pass in the TapReporter when you instantiate the runner: import {SpecRunner, TapReporter} from ‘./Scripts/TypeSpec/TypeSpec’; var runner = new SpecRunner(new TapReporter()); You’ll now get TAP compliant output that […]