Bit Manipulation Gray Code Sequence Typed

function grayCode(n: number): number[] {
  const result: number[] = [];
  const count = 1 << n;
  for (let i = 0; i < count; i++) result.push(i ^ (i >>> 1));
  return result;
}
function grayToBinary(gray: number): number { let bin = gray; while (gray >>> 1) { gray >>>= 1; bin ^= gray; } return bin; }
function popcount(x: number): number { x = x - ((x >>> 1) & 0x55555555); x = (x & 0x33333333) + ((x >>> 2) & 0x33333333); x = (x + (x >>> 4)) & 0x0f0f0f0f; return (x * 0x01010101) >>> 24; }