From f506f047b8d0688326b1b477cfed66c8a5f31e70 Mon Sep 17 00:00:00 2001
From: Colin Dawson <me@cjdawson.com>
Date: Fri, 13 Mar 2026 00:48:10 +0000
Subject: [PATCH] Updated visualiser showing a flowchart style output

---
 .../components/VisualisetTab.tsx              | 694 +++++++++++++++++-
 1 file changed, 672 insertions(+), 22 deletions(-)

diff --git a/src/modules/manager/workflowTemplates/components/VisualisetTab.tsx b/src/modules/manager/workflowTemplates/components/VisualisetTab.tsx
index 3461fd1..4e55789 100644
--- a/src/modules/manager/workflowTemplates/components/VisualisetTab.tsx
+++ b/src/modules/manager/workflowTemplates/components/VisualisetTab.tsx
@@ -1,43 +1,693 @@
 import React from "react";
-import { CreateWorkflowTemplateVersion } from "../services/WorkflowTemplateService";
+import templateVersionsService, {
+  CreateWorkflowTemplateVersion,
+  TaskMetadata,
+} from "../services/WorkflowTemplateService";
 import ValidationErrorIcon from "../../../../components/validationErrorIcon";
+import { sortTasksTopologically } from "./workflowGraphUtils";
+import { useTranslation } from "react-i18next";
+import { Namespaces } from "../../../../i18n/i18n";
 
 interface VisualiserTabProps {
   data: CreateWorkflowTemplateVersion;
   taskValidation: Record<string, boolean>;
 }
 
+type WorkflowTask = CreateWorkflowTemplateVersion["tasks"][0];
+type WorkflowEdge = {
+  sourceGuid: string;
+  targetGuid: string;
+  labels: string[];
+  sourceIndex: number;
+  sourceCount: number;
+  targetIndex: number;
+  targetCount: number;
+};
+
+function getOutcomeId(value: string): string {
+  return value.split(".").pop() ?? value;
+}
+
+function getOutcomeLinks(
+  task: WorkflowTask,
+): Array<{ targetGuid: string; label: string }> {
+  const raw = task.config.outcomeActions as unknown;
+
+  if (Array.isArray(raw)) {
+    return raw
+      .map((entry) => {
+        const value = entry as Partial<{
+          outcome: string;
+          verdict: string;
+          task: string | null;
+        }>;
+        if (!value.task) {
+          return null;
+        }
+
+        return {
+          targetGuid: value.task,
+          label: value.outcome ?? value.verdict ?? "",
+        };
+      })
+      .filter(
+        (link): link is { targetGuid: string; label: string } =>
+          !!link && typeof link.targetGuid === "string",
+      );
+  }
+
+  if (raw && typeof raw === "object") {
+    return Object.entries(raw as Record<string, string | null>)
+      .filter(([, targetGuid]) => typeof targetGuid === "string")
+      .map(([label, targetGuid]) => ({
+        targetGuid: targetGuid as string,
+        label,
+      }));
+  }
+
+  return [];
+}
+
+function getOutcomeTargets(task: WorkflowTask): string[] {
+  return getOutcomeLinks(task)
+    .map((link) => link.targetGuid)
+    .filter(
+      (targetGuid, index, all) =>
+        typeof targetGuid === "string" && all.indexOf(targetGuid) === index,
+    );
+}
+
+function buildLevels(tasks: WorkflowTask[]): WorkflowTask[][] {
+  if (tasks.length === 0) {
+    return [];
+  }
+
+  const byGuid = new Map<string, WorkflowTask>();
+  const indexByGuid = new Map<string, number>();
+  const outgoing = new Map<string, Set<string>>();
+  const indegree = new Map<string, number>();
+  const levelByGuid = new Map<string, number>();
+
+  tasks.forEach((task, index) => {
+    const guid = task.config.guid as string;
+    byGuid.set(guid, task);
+    indexByGuid.set(guid, index);
+    outgoing.set(guid, new Set<string>());
+    indegree.set(guid, 0);
+    levelByGuid.set(guid, 0);
+  });
+
+  tasks.forEach((task) => {
+    const sourceGuid = task.config.guid as string;
+    const sourceTargets = outgoing.get(sourceGuid) as Set<string>;
+
+    getOutcomeTargets(task).forEach((targetGuid) => {
+      if (!byGuid.has(targetGuid) || targetGuid === sourceGuid) {
+        return;
+      }
+
+      if (sourceTargets.has(targetGuid)) {
+        return;
+      }
+
+      sourceTargets.add(targetGuid);
+      indegree.set(targetGuid, (indegree.get(targetGuid) ?? 0) + 1);
+    });
+  });
+
+  const queue: string[] = [];
+  tasks.forEach((task) => {
+    const guid = task.config.guid as string;
+    if ((indegree.get(guid) ?? 0) === 0) {
+      queue.push(guid);
+    }
+  });
+
+  queue.sort((a, b) => (indexByGuid.get(a) ?? 0) - (indexByGuid.get(b) ?? 0));
+
+  const visited = new Set<string>();
+  while (queue.length > 0) {
+    const guid = queue.shift() as string;
+    visited.add(guid);
+
+    const currentLevel = levelByGuid.get(guid) ?? 0;
+    (outgoing.get(guid) ?? new Set<string>()).forEach((targetGuid) => {
+      levelByGuid.set(
+        targetGuid,
+        Math.max(levelByGuid.get(targetGuid) ?? 0, currentLevel + 1),
+      );
+
+      const nextInDegree = (indegree.get(targetGuid) ?? 0) - 1;
+      indegree.set(targetGuid, nextInDegree);
+      if (nextInDegree === 0) {
+        queue.push(targetGuid);
+      }
+    });
+
+    queue.sort((a, b) => (indexByGuid.get(a) ?? 0) - (indexByGuid.get(b) ?? 0));
+  }
+
+  // Cycle fallback: place unresolved tasks by original order on next available level.
+  if (visited.size < tasks.length) {
+    let maxLevel = 0;
+    levelByGuid.forEach((level) => {
+      maxLevel = Math.max(maxLevel, level);
+    });
+
+    tasks.forEach((task) => {
+      const guid = task.config.guid as string;
+      if (!visited.has(guid)) {
+        maxLevel += 1;
+        levelByGuid.set(guid, maxLevel);
+      }
+    });
+  }
+
+  const grouped = new Map<number, WorkflowTask[]>();
+  tasks.forEach((task) => {
+    const guid = task.config.guid as string;
+    const level = levelByGuid.get(guid) ?? 0;
+    const list = grouped.get(level) ?? [];
+    list.push(task);
+    grouped.set(level, list);
+  });
+
+  return Array.from(grouped.entries())
+    .sort((a, b) => a[0] - b[0])
+    .map((entry) => entry[1]);
+}
+
+function buildEdges(tasks: WorkflowTask[]): WorkflowEdge[] {
+  const validGuids = new Set(tasks.map((task) => task.config.guid as string));
+  const grouped = new Map<
+    string,
+    { sourceGuid: string; targetGuid: string; labels: Set<string> }
+  >();
+
+  tasks.forEach((task) => {
+    const sourceGuid = task.config.guid as string;
+
+    getOutcomeLinks(task).forEach(({ targetGuid, label }) => {
+      if (!validGuids.has(targetGuid) || targetGuid === sourceGuid) {
+        return;
+      }
+
+      const key = `${sourceGuid}->${targetGuid}`;
+      const existing = grouped.get(key);
+      if (existing) {
+        if (label) {
+          existing.labels.add(label);
+        }
+        return;
+      }
+
+      grouped.set(key, {
+        sourceGuid,
+        targetGuid,
+        labels: new Set(label ? [label] : []),
+      });
+    });
+  });
+
+  const edges = Array.from(grouped.values()).map((edge) => ({
+    sourceGuid: edge.sourceGuid,
+    targetGuid: edge.targetGuid,
+    labels: Array.from(edge.labels).sort((a, b) => a.localeCompare(b)),
+    sourceIndex: 0,
+    sourceCount: 1,
+    targetIndex: 0,
+    targetCount: 1,
+  }));
+
+  const bySource = new Map<string, WorkflowEdge[]>();
+  const byTarget = new Map<string, WorkflowEdge[]>();
+
+  edges.forEach((edge) => {
+    const sourceList = bySource.get(edge.sourceGuid) ?? [];
+    sourceList.push(edge);
+    bySource.set(edge.sourceGuid, sourceList);
+
+    const targetList = byTarget.get(edge.targetGuid) ?? [];
+    targetList.push(edge);
+    byTarget.set(edge.targetGuid, targetList);
+  });
+
+  bySource.forEach((sourceEdges) => {
+    sourceEdges.sort((a, b) => a.targetGuid.localeCompare(b.targetGuid));
+    sourceEdges.forEach((edge, index) => {
+      edge.sourceIndex = index;
+      edge.sourceCount = sourceEdges.length;
+    });
+  });
+
+  byTarget.forEach((targetEdges) => {
+    targetEdges.sort((a, b) => a.sourceGuid.localeCompare(b.sourceGuid));
+    targetEdges.forEach((edge, index) => {
+      edge.targetIndex = index;
+      edge.targetCount = targetEdges.length;
+    });
+  });
+
+  return edges;
+}
+
 const VisualiserTab: React.FC<VisualiserTabProps> = ({
   data,
   taskValidation,
 }) => {
-  const tasks = data.tasks;
+  const { t: tEnum } = useTranslation(Namespaces.enumValues);
+  const [taskMetadata, setTaskMetadata] = React.useState<TaskMetadata[]>([]);
+
+  const tasks = React.useMemo(
+    () => sortTasksTopologically(data.tasks) as WorkflowTask[],
+    [data.tasks],
+  );
+  const taskByGuid = React.useMemo(() => {
+    const byGuid = new Map<string, WorkflowTask>();
+    tasks.forEach((task) => {
+      byGuid.set(task.config.guid as string, task);
+    });
+    return byGuid;
+  }, [tasks]);
+  const metadataByTaskType = React.useMemo(() => {
+    const map = new Map<string, TaskMetadata>();
+    taskMetadata.forEach((meta) => {
+      map.set(meta.taskType, meta);
+    });
+    return map;
+  }, [taskMetadata]);
+
+  React.useEffect(() => {
+    let mounted = true;
+
+    const loadTaskMetadata = async () => {
+      const meta = await templateVersionsService.getTaskMetadata("");
+      if (mounted) {
+        setTaskMetadata(meta);
+      }
+    };
+
+    loadTaskMetadata();
+
+    return () => {
+      mounted = false;
+    };
+  }, []);
+  const levels = React.useMemo(() => buildLevels(tasks), [tasks]);
+  const edges = React.useMemo(() => buildEdges(tasks), [tasks]);
+  const levelByGuid = React.useMemo(() => {
+    const levelMap = new Map<string, number>();
+    levels.forEach((level, levelIndex) => {
+      level.forEach((task) => {
+        levelMap.set(task.config.guid as string, levelIndex);
+      });
+    });
+    return levelMap;
+  }, [levels]);
+  const edgeLaneOffsetByKey = React.useMemo(() => {
+    const grouped = new Map<string, WorkflowEdge[]>();
+
+    edges.forEach((edge) => {
+      const sourceLevel = levelByGuid.get(edge.sourceGuid) ?? 0;
+      const targetLevel = levelByGuid.get(edge.targetGuid) ?? 0;
+
+      let routeType = "adjacent";
+      if (targetLevel - sourceLevel > 1) {
+        routeType = "down-skip";
+      } else if (targetLevel < sourceLevel) {
+        routeType = "upward";
+      }
+
+      const bucketKey = `${routeType}:${Math.min(sourceLevel, targetLevel)}:${Math.max(sourceLevel, targetLevel)}`;
+      const list = grouped.get(bucketKey) ?? [];
+      list.push(edge);
+      grouped.set(bucketKey, list);
+    });
+
+    const offsets = new Map<string, number>();
+    grouped.forEach((group) => {
+      group
+        .sort((a, b) => {
+          const aKey = `${a.sourceGuid}-${a.targetGuid}`;
+          const bKey = `${b.sourceGuid}-${b.targetGuid}`;
+          return aKey.localeCompare(bKey);
+        })
+        .forEach((edge, index) => {
+          const centeredIndex = index - (group.length - 1) / 2;
+          const edgeKey = `${edge.sourceGuid}->${edge.targetGuid}`;
+          offsets.set(edgeKey, centeredIndex * 2.2);
+        });
+    });
+
+    return offsets;
+  }, [edges, levelByGuid]);
+  const visualiserContainerRef = React.useRef<HTMLDivElement>(null);
+  const [nodePositions, setNodePositions] = React.useState<
+    Map<string, { x: number; y: number; width: number; height: number }>
+  >(new Map());
+  const mergedLeftIncomingByTarget = React.useMemo(() => {
+    const incomingCount = new Map<string, number>();
+
+    edges.forEach((edge) => {
+      const sourceLevel = levelByGuid.get(edge.sourceGuid) ?? 0;
+      const targetLevel = levelByGuid.get(edge.targetGuid) ?? 0;
+      if (targetLevel < sourceLevel) {
+        incomingCount.set(
+          edge.targetGuid,
+          (incomingCount.get(edge.targetGuid) ?? 0) + 1,
+        );
+      }
+    });
+
+    const sharedLaneByTarget = new Map<string, number>();
+
+    edges.forEach((edge) => {
+      if ((incomingCount.get(edge.targetGuid) ?? 0) <= 1) {
+        return;
+      }
+
+      const source = nodePositions.get(edge.sourceGuid);
+      const target = nodePositions.get(edge.targetGuid);
+      if (!source || !target) {
+        return;
+      }
+
+      const sourceLevel = levelByGuid.get(edge.sourceGuid) ?? 0;
+      const targetLevel = levelByGuid.get(edge.targetGuid) ?? 0;
+      if (targetLevel >= sourceLevel) {
+        return;
+      }
+
+      const sourceShift =
+        (edge.sourceIndex - (edge.sourceCount - 1) / 2) * 2.25;
+      const laneSpread =
+        edgeLaneOffsetByKey.get(`${edge.sourceGuid}->${edge.targetGuid}`) ?? 0;
+      const startX = source.x - source.width / 2;
+      const startY = source.y + sourceShift * 0.35 + laneSpread * 0.25;
+      const endX = target.x - target.width / 2;
+      const endY = target.y;
+      const verticalSpan = Math.abs(endY - startY);
+      const longRouteExtra =
+        Math.max(0, verticalSpan - 10) * 0.2 +
+        Math.abs(targetLevel - sourceLevel) * 1.2;
+      const candidateLaneX =
+        Math.min(startX, endX) -
+        6 -
+        Math.abs(sourceShift) +
+        -longRouteExtra +
+        laneSpread * 1.2;
+
+      const current = sharedLaneByTarget.get(edge.targetGuid);
+      sharedLaneByTarget.set(
+        edge.targetGuid,
+        current === undefined
+          ? candidateLaneX
+          : Math.min(current, candidateLaneX),
+      );
+    });
+
+    return sharedLaneByTarget;
+  }, [edges, levelByGuid, edgeLaneOffsetByKey, nodePositions]);
+
+  React.useEffect(() => {
+    const measurePositions = () => {
+      if (!visualiserContainerRef.current) {
+        return;
+      }
+
+      const containerRect =
+        visualiserContainerRef.current.getBoundingClientRect();
+      if (containerRect.width === 0 || containerRect.height === 0) {
+        return;
+      }
+
+      const positions = new Map<
+        string,
+        { x: number; y: number; width: number; height: number }
+      >();
+
+      const nodes =
+        visualiserContainerRef.current.querySelectorAll(".visualiser-node");
+      nodes.forEach((node) => {
+        const guid = node.getAttribute("data-guid");
+        if (!guid) {
+          return;
+        }
+
+        const nodeRect = node.getBoundingClientRect();
+        const x =
+          ((nodeRect.left - containerRect.left + nodeRect.width / 2) /
+            containerRect.width) *
+          100;
+        const y =
+          ((nodeRect.top - containerRect.top + nodeRect.height / 2) /
+            containerRect.height) *
+          100;
+        const width = (nodeRect.width / containerRect.width) * 100;
+        const height = (nodeRect.height / containerRect.height) * 100;
+
+        positions.set(guid, { x, y, width, height });
+      });
+
+      setNodePositions(positions);
+    };
+
+    const timer = setTimeout(measurePositions, 50);
+
+    if (!visualiserContainerRef.current) {
+      return () => clearTimeout(timer);
+    }
+
+    const resizeObserver = new ResizeObserver(() => {
+      measurePositions();
+    });
+
+    resizeObserver.observe(visualiserContainerRef.current);
+
+    return () => {
+      clearTimeout(timer);
+      resizeObserver.disconnect();
+    };
+  }, [levels]);
 
   return (
     <div className="visualiser-root">
-      <div className="visualiser-container">
-        <div className="visualiser-flow">
-          <div className="visualiser-level">
-            <div className="visualiser-level-row">
-              {tasks.map((task) => (
-                <div
-                  key={task.config.guid as string}
-                  className="visualiser-node"
-                  data-guid={task.config.guid as string}
-                >
-                  <div className="visualiser-node-content">
-                    <ValidationErrorIcon
-                      visible={
-                        taskValidation[task.config.guid as string] === false
-                      }
-                    />
-                    <span>{(task.config.name as string) || task.type}</span>
+      <div className="visualiser-container" ref={visualiserContainerRef}>
+        <div className="visualiser-flow" style={{ gap: "56px" }}>
+          {levels.map((level, levelIndex) => (
+            <div key={`level-${levelIndex}`} className="visualiser-level">
+              <div
+                className="visualiser-level-row"
+                style={{
+                  gridTemplateColumns: `repeat(${Math.max(level.length, 1)}, minmax(220px, 1fr))`,
+                  gap: "40px",
+                }}
+              >
+                {level.map((task) => (
+                  <div
+                    key={task.config.guid as string}
+                    className="visualiser-node"
+                    data-guid={task.config.guid as string}
+                  >
+                    <div className="visualiser-node-content">
+                      <ValidationErrorIcon
+                        visible={
+                          taskValidation[task.config.guid as string] === false
+                        }
+                      />
+                      <span>{(task.config.name as string) || task.type}</span>
+                    </div>
                   </div>
-                </div>
-              ))}
+                ))}
+              </div>
             </div>
-          </div>
+          ))}
         </div>
+        <svg
+          aria-hidden="true"
+          className="visualiser-outcome-connectors"
+          viewBox="0 0 100 100"
+          preserveAspectRatio="none"
+        >
+          <defs>
+            <marker
+              id="visualiser-arrow"
+              markerWidth="8"
+              markerHeight="8"
+              refX="7"
+              refY="4"
+              orient="auto"
+            >
+              <path
+                className="visualiser-outcome-connector-arrow"
+                d="M 0 0 L 8 4 L 0 8 z"
+              />
+            </marker>
+          </defs>
+          {edges.map((edge) => {
+            const source = nodePositions.get(edge.sourceGuid);
+            const target = nodePositions.get(edge.targetGuid);
+
+            if (!source || !target) {
+              return null;
+            }
+
+            const sourceShift =
+              (edge.sourceIndex - (edge.sourceCount - 1) / 2) * 2.25;
+            const targetShift =
+              (edge.targetIndex - (edge.targetCount - 1) / 2) * 1.5;
+            const edgeKey = `${edge.sourceGuid}->${edge.targetGuid}`;
+            const laneSpread = edgeLaneOffsetByKey.get(edgeKey) ?? 0;
+            const sourceLevel = levelByGuid.get(edge.sourceGuid) ?? 0;
+            const targetLevel = levelByGuid.get(edge.targetGuid) ?? 0;
+            const levelDelta = targetLevel - sourceLevel;
+            const mergedLeftLaneX = mergedLeftIncomingByTarget.get(
+              edge.targetGuid,
+            );
+            const isMergedLeft =
+              levelDelta < 0 && mergedLeftLaneX !== undefined;
+
+            let path = "";
+            let labelX = 0;
+            let labelY = 0;
+            let labelAnchor: "start" | "middle" | "end" = "middle";
+
+            if (levelDelta > 1) {
+              // Multi-level downward jumps: route on the right side.
+              const startX = source.x + source.width / 2;
+              const startY = source.y + sourceShift * 0.35 + laneSpread * 0.25;
+              const endX = target.x + target.width / 2;
+              const endY = target.y + targetShift * 0.35 + laneSpread * 0.25;
+              const verticalSpan = Math.abs(endY - startY);
+              const longRouteExtra =
+                Math.max(0, verticalSpan - 10) * 0.2 + (levelDelta - 1) * 1.2;
+              const laneX =
+                Math.max(startX, endX) +
+                6 +
+                Math.abs(sourceShift) +
+                longRouteExtra +
+                laneSpread * 1.2;
+
+              path = `M ${startX} ${startY} L ${laneX} ${startY} L ${laneX} ${endY} L ${endX} ${endY}`;
+              labelX = startX + 0.9;
+              labelY = startY - 1.5 - Math.abs(laneSpread) * 0.12;
+              labelAnchor = "start";
+            } else if (levelDelta < 0) {
+              // Upward jumps: route on the left side.
+              const startX = source.x - source.width / 2;
+              const startY = source.y + sourceShift * 0.35 + laneSpread * 0.25;
+              const endX = target.x - target.width / 2;
+              const endY = isMergedLeft
+                ? target.y
+                : target.y + targetShift * 0.35 + laneSpread * 0.25;
+              const verticalSpan = Math.abs(endY - startY);
+              const longRouteExtra =
+                Math.max(0, verticalSpan - 10) * 0.2 +
+                Math.abs(levelDelta) * 1.2;
+              const laneX =
+                mergedLeftLaneX ??
+                Math.min(startX, endX) -
+                  6 -
+                  Math.abs(sourceShift) +
+                  -longRouteExtra +
+                  laneSpread * 1.2;
+
+              path = isMergedLeft
+                ? `M ${startX} ${startY} L ${laneX} ${startY} L ${laneX} ${endY}`
+                : `M ${startX} ${startY} L ${laneX} ${startY} L ${laneX} ${endY} L ${endX} ${endY}`;
+              labelX = startX - 0.9;
+              labelY = startY - 1.5 - Math.abs(laneSpread) * 0.12;
+              labelAnchor = "end";
+            } else {
+              // Adjacent forward flow: keep curved center connectors.
+              const startX = source.x;
+              const startY = source.y + source.height / 2;
+              const endX = target.x;
+              const endY = target.y - target.height / 2;
+              const controlOffset = Math.max(4, Math.abs(endY - startY) * 0.25);
+              const startControlX = startX + sourceShift + laneSpread;
+              const endControlX = endX + targetShift + laneSpread;
+
+              path = `M ${startX} ${startY} C ${startControlX} ${startY + controlOffset}, ${endControlX} ${endY - controlOffset}, ${endX} ${endY}`;
+
+              const t = 0.5;
+              labelX =
+                Math.pow(1 - t, 3) * startX +
+                3 * Math.pow(1 - t, 2) * t * startControlX +
+                3 * (1 - t) * Math.pow(t, 2) * endControlX +
+                Math.pow(t, 3) * endX;
+              labelY =
+                Math.pow(1 - t, 3) * startY +
+                3 * Math.pow(1 - t, 2) * t * (startY + controlOffset) +
+                3 * (1 - t) * Math.pow(t, 2) * (endY - controlOffset) +
+                Math.pow(t, 3) * endY;
+              labelAnchor = "middle";
+            }
+
+            const sourceTask = taskByGuid.get(edge.sourceGuid);
+            const sourceMetadata = sourceTask
+              ? metadataByTaskType.get(sourceTask.type)
+              : undefined;
+            const label = edge.labels
+              .map((outcome) => {
+                if (!sourceMetadata) {
+                  return tEnum(outcome);
+                }
+
+                const matchedOutcome = sourceMetadata.outcomes.find(
+                  (candidate) =>
+                    candidate === outcome ||
+                    getOutcomeId(candidate) === outcome,
+                );
+
+                return tEnum(matchedOutcome ?? outcome);
+              })
+              .join(", ");
+
+            return (
+              <g key={`${edge.sourceGuid}-${edge.targetGuid}`}>
+                <path
+                  className="visualiser-outcome-connector-line"
+                  d={path}
+                  markerEnd={
+                    isMergedLeft ? undefined : "url(#visualiser-arrow)"
+                  }
+                />
+                {label && (
+                  <text
+                    x={labelX}
+                    y={labelY - 1.25}
+                    className="visualiser-outcome-connector-label"
+                    textAnchor={labelAnchor}
+                    dominantBaseline="middle"
+                  >
+                    {label}
+                  </text>
+                )}
+              </g>
+            );
+          })}
+          {Array.from(mergedLeftIncomingByTarget.entries()).map(
+            ([targetGuid, laneX]) => {
+              const target = nodePositions.get(targetGuid);
+              if (!target) {
+                return null;
+              }
+
+              const endX = target.x - target.width / 2;
+              const endY = target.y;
+
+              return (
+                <path
+                  key={`merged-left-${targetGuid}`}
+                  className="visualiser-outcome-connector-line"
+                  d={`M ${laneX} ${endY} L ${endX} ${endY}`}
+                  markerEnd="url(#visualiser-arrow)"
+                />
+              );
+            },
+          )}
+        </svg>
       </div>
     </div>
   );