ComfyUI/custom_nodes/ComfyUI-Custom-Scripts/web/js/common/utils.js

import { $el } from "../../../../scripts/ui.js";

export function addStylesheet(url) {
	if (url.endsWith(".js")) {
		url = url.substr(0, url.length - 2) + "css";
	}
	$el("link", {
		parent: document.head,
		rel: "stylesheet",
		type: "text/css",
		href: url.startsWith("http") ? url : getUrl(url),
	});
}

export function getUrl(path, baseUrl) {
	if (baseUrl) {
		return new URL(path, baseUrl).toString();
	} else {
		return new URL("../" + path, import.meta.url).toString();
	}
}

export async function loadImage(url) {
	return new Promise((res, rej) => {
		const img = new Image();
		img.onload = res;
		img.onerror = rej;
		img.src = url;
	});
}