Edge Markers

React Flow has built-in support for different marker types for your edges. It’s possible to add your own SVG markers , too.

The markers are defined as SVG elements, so you can use any SVG you want. The React Flow edge renderer will expect the marker definition to be in a <defs> element.

If, for example, your custom edge is wrapping a built-in <BaseEdge/> component, you can pass the markerStart and markerEnd props to the <BaseEdge/> component. The built-in React Flow edge components will expect the markerStart and markerEnd props to be in the format "url(#markerId)", where markerId is the ID of your marker definition.

This allows you to customize the marker for a specific edge, depending on the state of the edge.