(() => {
  const root = window;
  if (root?.twemoji?.convert?.toCodePoint) return;

  function toCodePoint(unicodeSurrogates, sep = '-') {
    const r = [];
    let c = 0;
    let p = 0;
    let i = 0;
    const s = String(unicodeSurrogates || '');

    while (i < s.length) {
      c = s.charCodeAt(i++);
      if (p) {
        r.push((0x10000 + ((p - 0xD800) * 0x400) + (c - 0xDC00)).toString(16));
        p = 0;
      } else if (c >= 0xD800 && c <= 0xDBFF) {
        p = c;
      } else {
        r.push(c.toString(16));
      }
    }

    return r.join(sep);
  }

  root.twemoji = root.twemoji || {};
  root.twemoji.convert = root.twemoji.convert || {};
  root.twemoji.convert.toCodePoint = toCodePoint;
})();