import { browserOnlyWarning } from "../warnings.js";
import assign from "../Object/assign.js";
import append from "../Element/append.js";
export default function loadCSS(url: string): Promise<void> {
  browserOnlyWarning._throw();
  const link: HTMLLinkElement = assign(document.createElement("link"), {
    rel: "stylesheet",
    href: url
  });
  return new Promise((res, rej) => {
    const opt = { once: true };
    link.addEventListener("load", () => res(), opt);
    link.addEventListener("error", () => rej(), opt);
    (append as any)(document.head, link);
  });
}