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

This is one way:

class SomeClass {
    private static myStaticVariable = "whatever";
    private static __static_ctor = (() => { /* do static constructor stuff :) */ })();
}

__static_ctor here is an immediately invoked function expression. Typescript will output code to call it at the end of the generated class.

Update: For generic types in static constructors, which are no longer allowed to be referenced by static members, you will need an extra step now:

class SomeClass {
    static myStaticVariable = "whatever";
    private ___static_ctor = (() => { var someClass:SomeClass ; /* do static constructor stuff :) */ })();
    private static __static_ctor = SomeClass.prototype.___static_ctor();
}

In any case, of course, you could just call the generic type static constructor after the class, such as:

class SomeClass {
    static myStaticVariable = "whatever";
    private __static_ctor = (() => { var example: SomeClass; /* do static constructor stuff :) */ })();
}
SomeClass.prototype.__static_ctor();

Just remember to NEVER use this in __static_ctor above (obviously).