How to access static members from instance methods in typescript?

Question

I try to use a static member from an instance method. I know about accessing static member from non-static function in typescript, but I do not want to hard code the class to allow inheritance:

class Logger {   protected static PREFIX = '[info]';    public log(msg: string) {     console.log(Logger.PREFIX + ' ' + msg); // What to use instead of Logger` to get the expected result?   } }  class Warner extends Logger {   protected static PREFIX = '[warn]'; }  (new Logger).log('=> should be prefixed [info]'); (new Warner).log('=> should be prefixed [warn]'); 

I've tried things like

typeof this.PREFIX 

Answer 1

You simply need ClassName.property :

class Logger {   protected static PREFIX = '[info]';   public log(message: string): void {     alert(Logger.PREFIX + string);    } }  class Warner extends Logger {   protected static PREFIX = '[warn]'; } 

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MORE

from : http://basarat.gitbooks.io/typescript/content/docs/classes.html

TypeScript classes support static properties that are shared by all instances of the class. A natural place to put (and access) them is on the class itself and that is what TypeScript does:

class Something {     static instances = 0;     constructor() {         Something.instances++;     } }  var s1 = new Something(); var s2 = new Something(); console.log(Someting.instances); // 2 

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UPDATE

If you want it to inherit from the particular instance's constructor use this.constructor. Sadly you need to use some type assertion. I am using typeof Logger shown below:

class Logger {   protected static PREFIX = '[info]';   public log(message: string): void {     var logger = <typeof Logger>this.constructor;      alert(logger.PREFIX + message);    } }  class Warner extends Logger {   protected static PREFIX = '[warn]'; }