code: function toCodePoints(input) {
    const codepoints = [];
    const size = input.length;
  
    for (let i = 0; i < size; i += 1) {
      const before = input.charCodeAt(i);
  
      if (before >= 0xd800 && before <= 0xdbff && size > i + 1) {
        const next = input.charCodeAt(i + 1);
  
        if (next >= 0xdc00 && next <= 0xdfff) {
          codepoints.push((before - 0xd800) * 0x400 + next - 0xdc00 + 0x10000);
          i += 1;
          continue;
        }
      }
  
      codepoints.push(before);
    }
  
    return codepoints;
  }
docs: Convert provided string into an array of Unicode Code Points.
  Based on https://stackoverflow.com/a/21409165/1556249
  and https://www.npmjs.com/package/code-point-at.
  @param {string} input
  @returns {number[]}