export class EventBus extends EventTarget {
  trigger(name: string, payload?: any) {
    this.dispatchEvent(new CustomEvent(name, { detail: payload }));
  }
}

export function whenReady(fn?: any): Promise<void> {
  return new Promise(function (resolve) {
    if (document.readyState !== "loading") {
      resolve(true);
    } else {
      document.addEventListener("DOMContentLoaded", resolve, false);
    }
  }).then(fn || function () {});
}

export async function loadFile(url: string): Promise<string> {
  const result = await fetch(url);
  if (!result.ok) {
    throw new Error("Error while fetching xml templates");
  }
  return await result.text();
}