diff --git a/src/index.ts b/src/index.ts
index 55f6748..249256e 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -21,6 +21,13 @@
 // can go anywhere.
 export * from './core/register.ts';
 export * from './core/props.ts';
+// WithProps, the prop-fragment helpers, and the event-map fragments are the
+// same toolkit our own components are built from -- exported so a
+// third-party plugin component can be built the same way, rather than
+// reaching into dist/core/* directly (undocumented, not a stable contract).
+export * from './core/with-props.ts';
+export * from './core/shared-props.ts';
+export * from './core/event-types.ts';
 export { LeafletMap } from './components/leaflet-map.ts';
 export { LeafletControlLayers } from './components/leaflet-control-layers.ts';
 export { LeafletLayerGroup } from './components/leaflet-layer-group.ts';