Function roll

src/buddy/companion.ts:107–113

(userId: string)

// per-turn observer) with the same userId → cache the deterministic result.
let rollCache: { key: string; value: Roll } | undefined
export function roll(userId: string): Roll {
  const key = userId + SALT
  if (rollCache?.key === key) return rollCache.value
  const value = rollFrom(mulberry32(hashString(key)))
  rollCache = { key, value }
  return value
}

export function rollWithSeed(seed: string): Roll {
  return rollFrom(mulberry32(hashString(seed)))