Function hook

scripts/soundcloud_downloadMusic.js:20–30

(obj, name, callback)

  pageScript: {
    onDocumentStart: async () => {
      function hook(obj, name, callback) {
        const fn = obj[name];
        obj[name] = function (...args) {
          callback.apply(this, args);
          fn.apply(this, args);
        };
        return () => {
          // restore
          obj[name] = fn;
        };
      }

      const btnId = "ufs-soundcloud-downloadBtn";
      const downloadBtn = document.createElement("button");