TypeScript static classes

javascript class static typescript
Rayjax picture Rayjax · Nov 3, 2012 · Viewed 176k times · Source

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.

In C#, I often use static classes to organize variables and methods, putting them together in a named class, without needing to instatiate an object. In vanilla JS, I used to do this with a simple JS object:

var myStaticClass = {
    property: 10,
    method: function(){}
}

In TypeScript, I would rather go for my C-sharpy approach, but it seems that static classes don't exist in TS. What is the appropriate solution for this problem ?

Answer

Fenton picture Fenton · Nov 4, 2012

Abstract classes have been a first-class citizen of TypeScript since TypeScript 1.6. You cannot instantiate an abstract class.

Here is an example:

export abstract class MyClass {         
    public static myProp = "Hello";

    public static doSomething(): string {
      return "World";
    }
}

const okay = MyClass.doSomething();

//const errors = new MyClass(); // Error

Related questions

Call static methods from regular ES6 class methods

What's the standard way to call static methods? I can think of using constructor or using the name of the class itself, I don't like the latter since it doesn't feel necessary. Is the former the recommended way, or is …

Read More
js call static method from class

I have a class with a static method: class User { constructor() { User.staticMethod(); } static staticMethod() {} } Is there something like this so for static methods (i.e. refer to the current class without an instance). this.staticMethod() so I don't have …

Read More
How to spyOn a static class method with Jasmine

I have a class with a static method that I want to test in Jasmine. I understand that static methods are not callable on instances of the class. So besides the fact that it cannot find the method to spyOn, …

Read More