Function assignVariantBucket

api/src/utils/drip-campaign.ts:10–19

(userId: string)

 * @returns 'A' or 'B' based on the hash.
 */
export function assignVariantBucket(userId: string): 'A' | 'B' {
  // Create a hash of the userId
  const hash = crypto.createHash('sha256').update(userId).digest('hex');

  // Convert first character of hash to a number (0-15 in hex)
  // Use modulo 2 to determine bucket A or B
  const numericValue = parseInt(hash.charAt(0), 16);

  return numericValue % 2 === 0 ? 'A' : 'B';
}