Function extractMessageKeys

packages/db-ivm/tests/test-utils.ts:268–276

(
  messages: Array<[[K, V], number]>,
)

 * Extract unique keys from messages to verify incremental behavior
 */
export function extractMessageKeys<K, V>(
  messages: Array<[[K, V], number]>,
): Set<K> {
  const keys = new Set<K>()
  for (const [[key, _value], _multiplicity] of messages) {
    keys.add(key)
  }
  return keys
}

/**
 * Assert that only specific keys appear in messages (for incremental processing verification)