TypeScript static classes

Question

I wanted to move to TypeScript from traditional JS because I like the C#-like syntax. My problem is that I can\'t find out how to declare static classes in TypeScript.

Answer 1

I was searching for something similar and came accross something called the Singleton Pattern.

Reference: Singleton Pattern

I am working on a BulkLoader class to load different types of files and wanted to use the Singleton pattern for it. This way I can load files from my main application class and retrieve the loaded files easily from other classes.

Below is a simple example how you can make a score manager for a game with TypeScript and the Singleton pattern.

class SingletonClass {

private static _instance:SingletonClass = new SingletonClass();

private _score:number = 0;

constructor() {
    if(SingletonClass._instance){
        throw new Error("Error: Instantiation failed: Use SingletonDemo.getInstance() instead of new.");
    }
    SingletonClass._instance = this;
}

public static getInstance():SingletonClass
{
    return SingletonClass._instance;
}

public setScore(value:number):void
{
    this._score = value;
}

public getScore():number
{
    return this._score;
}

public addPoints(value:number):void
{
    this._score += value;
}

public removePoints(value:number):void
{
    this._score -= value;
}   }

Then anywhere in your other classes you would get access to the Singleton by:

var scoreManager = SingletonClass.getInstance();
scoreManager.setScore(10); scoreManager.addPoints(1);
scoreManager.removePoints(2); console.log( scoreManager.getScore() );