I'm seriously considering switching to Node.js from PHP. But I don't really like the prototyping in Javascript so I would favor Typescript over this.
I was just testing the basics and created a new (Typescript) Express project in Visual Studio 2013. I have Node.js for Visual Studio installed.
I created a directory called tstests, added a file called animals.ts with the following code from the Typescript tutorial:
class Animal {
name: string;
constructor(theName: string) { this.name = theName; }
move(meters: number) {
alert(this.name + " moved " + meters + "m.");
}
}
class Snake extends Animal {
constructor(name: string) { super(name); }
move() {
alert("Slithering...");
super.move(5);
}
}
class Horse extends Animal {
constructor(name: string) { super(name); }
move() {
alert("Galloping...");
super.move(45);
}
}
Then I added the following piece of code to app.ts:
/// <reference path='tstests/animals.ts'/>
var sam = new Snake("Sammy the Python");
sam.move();
Both IntelliSense and building the project work, but when I try to run the project I get a ReferenceError: Snake is not defined.
Can anyone explain to me how I have to solve this?
As you are running on Node, you can use external modules.
Replace:
/// <reference path='tstests/animals.ts'/>
With
import Animals = require('tstests/animals');
And in animals.ts add the word export to any class you want to make available...
//...
export class Snake extends Animal {
//...
You can now reference the Snake class using:
var sam = new Animals.Snake("Sammy the Python");
Node will load the modules for you and make them available.
If you were running in a browser, you would have to make sure you referenced each script in the right order within a script tag - but you can avoid all that work as Node will do it all for you.
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