如何键入提示类，而不是类的实例？

Question

How can I type hint a class, rather than an instance of the class?

I tried this, but I get Cannot use 'new' with an expression whose type lacks a call or construct signature.

class Foo {
}

class Bar extends Foo {
}

class Baz extends Foo {
}

function test(c: Foo) {
    new c();
}

test(Baz);

Answer 1

Use typeof :

class Foo {
}

class Bar extends Foo {
}

class Baz extends Foo {
}

function test(c: typeof Foo) {
    new c();
}

test(Baz);