diff --git a/front/src/modules/simulationResult/types.ts b/front/src/modules/simulationResult/types.ts
index 35d9207880f..8517bd95883 100644
--- a/front/src/modules/simulationResult/types.ts
+++ b/front/src/modules/simulationResult/types.ts
@@ -1,6 +1,6 @@
 import type { Dispatch, SetStateAction } from 'react';
 
-import type { LayerData, PowerRestrictionValues } from '@osrd-project/ui-charts';
+import type { LayerData, PathLevel, PowerRestrictionValues } from '@osrd-project/ui-charts';
 
 import type {
   PathProjectionResult,
@@ -126,3 +126,23 @@ export type DraggingState = {
   draggedTrain: IndividualTrainProjection;
   initialDepartureTime: Date;
 };
+
+/**
+ * Visual style of a curve, computed by the shared curve-style helper
+ * and used by STD (PathLayer) and TOD (OccupancyBlockLayer).
+ */
+export type CurveStyle = {
+  color: string;
+  opacity: number;
+  level?: PathLevel;
+  border?: {
+    offset: number;
+    color: string;
+    width?: number;
+    backgroundColor?: string;
+  };
+  label?: {
+    border?: { color: string; width: number };
+    fontWeight?: number;
+  };
+};