feat: export helpers

package.json

@@ -1,6 +1,6 @@
 {
   "name": "arrows-svg",
-  "version": "1.8.0",
+  "version": "1.8.1",
   "description": "SVG arrow between two HTML elements",
   "keywords": [
     "arrow",

src/index.tsx

@@ -6,5 +6,8 @@ assignArrowCreate(window);
 export default arrowCreate;
 export { arrowCreate }
 export { DIRECTION } from './consts';
-export { HEAD } from './head';
+export { castToAnchor } from './anchor';
+export { default as arrowVector } from './arrowVector';
+export { headTransformCSS, HeadWithPoint, HEAD } from './head';
 export { IArrow, IArrowComponentProps, IArrowProps } from './interfaces/IArrow';
+export { default as observer } from './observer/observer';

src/interfaces/IArrow.ts

@@ -1,5 +1,3 @@
-import { RefObject } from 'preact'
-
 import { Anchor } from '../anchor';
 import { HeadFactory, HeadFactoryList } from '../head';
 
@@ -21,6 +19,6 @@ export interface IArrowComponentProps {
   head?: HeadFactory | HeadFactoryList,
   from: Anchor,
   to: Anchor,
-  forwardRef?: RefObject<SVGSVGElement>,
+  forwardRef?: { current: SVGSVGElement | null },
   updateDelay?: number,
 }