index.ts

import { inject } from "mobx-react";
import * as React from "react";
import { ObjectOmit } from "typelevel-ts"; // We <3 You gcanti

function myInject<A, D extends keyof A>(
    mapStoreToProps: (store: any) => Pick<A, D>,
    component: React.ComponentType<A>
): React.SFC<ObjectOmit<A, D> & Partial<Pick<A, D>>>{
  return inject(mapStoreToProps)(component as any)
}

const MyComp = ({ label, count }: { label: string; count: number }) =>
  <p>
    {label} x {count} times!
  </p>;

const MyCompConnected = myInject((store: any) => ({ count: 1 }), MyComp);

const el1 = <MyCompConnected label="hello" />;
const el2 = <MyCompConnected labels="hello" />; // error! :D
const el3 = <MyCompConnected label="Hello world!" count={2} />;