plaid/src/js/radiomanifest.js

import radiomanifest from "@radiomanifest/radiomanifest";

const knownRadios = {
    "https://www.ondarossa.info": {
      "name": "ror"
    },
    "https://radiospore.oziosi.org": {},
    // "https://radiowombat.net": {},
    // "https://test.radiogramma.org": {},
    "https://radioblackout.org": {},
  }
class Controller {
  constructor() {
    this.cache = {}
    this.currentRadio = null

    for(let r in knownRadios) {
      this.get(r);
    }
  }

  async get(url) {
    if(this.cache[url]) {
      this.currentRadio = this.cache[url];
      return this.cache[url];
    }
    this.cache[url] = knownRadios[url];
    // fetch more data in background
    radiomanifest.get(url).then((rm) => {
      console.log("arrivato", url)
      this.cache[url] = rm
    })
  }
}

const ControllerSingleton = new Controller();
// console.log(ControllerSingleton);

export default ControllerSingleton;