Refactor: Better routing for smoothstep and step edge (#2407)

* refactor(step/smoothstep-edge): better default routing
* chore(edges): pass options
* chore(exports): add BaseEdge

packages/core/src/container/ReactFlow/utils.ts

@@ -28,14 +28,3 @@ export function useNodeOrEdgeTypes(nodeOrEdgeTypes: any, createTypes: any): any
 
   return typesParsed;
 }
-
-export function injectStyle(css: string): void {
-  if (!css || typeof document === 'undefined') return;
-
-  const head = document.head || document.getElementsByTagName('head')[0];
-  const style = document.createElement('style');
-
-  head.appendChild(style);
-
-  style.appendChild(document.createTextNode(css));
-}