import React from 'react';
interface A {
    a: number;
}


function foo(param: React.ComponentClass<A>) {
    return param;
}

function foobar<T extends A >(param: React.ComponentClass<T>) {
    foo(param);
}

<meta http-equiv="x-dns-prefetch-control" content="on" />
<link rel="dns-prefetch" href="http://www.baidu.com" />