Method validateSubflow

apps/sim/executor/dag/builder.ts:146–171

(
    dag: DAG,
    id: string,
    nodes: string[] | undefined,
    type: 'Loop' | 'Parallel'
  )

  }

  private validateSubflow(
    dag: DAG,
    id: string,
    nodes: string[] | undefined,
    type: 'Loop' | 'Parallel'
  ): void {
    const sentinelStartId =
      type === 'Loop' ? buildSentinelStartId(id) : buildParallelSentinelStartId(id)
    const sentinelStartNode = dag.nodes.get(sentinelStartId)

    if (!sentinelStartNode) return

    if (!nodes || nodes.length === 0) {
      return
    }

    const hasConnections = Array.from(sentinelStartNode.outgoingEdges.values()).some((edge) =>
      nodes.includes(normalizeNodeId(edge.target))
    )

    if (!hasConnections) {
      throw new Error(
        `${type} start is not connected to any blocks. Connect a block to the ${type.toLowerCase()} start.`
      )
    }
  }
}