TypeScript definition for factory function

Question

I'm seeking guidance on creating a class declaration in a .d.ts file.

The class has a method that accepts a typeof T and returns an instance of T.

Take a look at the WidgetFactory example typescriptlang.org/Handbook#writing-dts-files-examples. If you already have a .ts code for the class with the factory method... then just use the --declaration command line option of the tsc compiler and it will spit out the .d.ts file for you — xmojmr
– xmojmr, Commented Dec 31, 2014 at 4:40

basarat · Accepted Answer · 2014-12-31 04:16:00Z

10

You need something that is creatable and then its smooth sailing:

interface Creator<T> {
    new (): T;
}
function factory<T>( arg: Creator<T> ): T {
    return new arg();
}


// Usage: 
class Foo {
    something = 123;
}
var foo = factory( Foo ); // foo:Foo

answered Dec 31, 2014 at 4:16

basarat

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