Function getFieldValues

github-actions/browserstack/set-browserstack-env.js:15736–15746

(header)

        onloadstart: kEnumerableProperty,
        onprogress: kEnumerableProperty,
        onload: kEnumerableProperty,
        onabort: kEnumerableProperty,
        onerror: kEnumerableProperty,
        onloadend: kEnumerableProperty,
        [Symbol.toStringTag]: {
          value: "FileReader",
          writable: false,
          enumerable: false,
          configurable: true
        }
      });
      Object.defineProperties(FileReader, {
        EMPTY: staticPropertyDescriptors,
        LOADING: staticPropertyDescriptors,