interface CloudflareSubtleCrypto extends SubtleCrypto {
  timingSafeEqual(a: ArrayBuffer | ArrayBufferView, b: ArrayBuffer | ArrayBufferView): boolean;
}

export const timingSafeEqualBytes = (left: Uint8Array, right: Uint8Array): boolean => {
  const subtle = crypto.subtle as CloudflareSubtleCrypto;
  const lengthsMatch = left.byteLength === right.byteLength;
  return lengthsMatch ? subtle.timingSafeEqual(left, right) : !subtle.timingSafeEqual(left, left);
};