1-bit and 2-bit Characters

const len = bits.length - 1;
let i = 0;
while (i < len) {
  if (bits[i] === 0) {
    i++;
  } else if (bits[i] === 1) {
    if (i + 1 === len) {
      return false;
    }

    i += 2;
  }
}

return true;