added types for handles

packages/system/src/types/handles.ts

@@ -27,12 +27,29 @@ export type ConnectionHandle = {
 };
 
 export type HandleProps = {
+  /** type of the handle
+   * @example HandleType.Source, HandleType.Target
+   */
   type: HandleType;
+  /** position of the handle
+   * @example Position.TopLeft, Position.TopRight,
+   * Position.BottomLeft, Position.BottomRight
+   */
   position: Position;
+  /** should you be able to connect to/from this handle */
   isConnectable?: boolean;
+  /** shoud you be able to connect from this handle */
   isConnectableStart?: boolean;
+  /** should you be able to connect to this handle */
   isConnectableEnd?: boolean;
+  /** callback called when connection is made */
   onConnect?: OnConnect;
+  /** callback if connection is valid
+   * @remarks connection becomes an edge if isValidConnection returns true
+   */
   isValidConnection?: IsValidConnection;
+  /** id of the handle
+   * @remarks optional if there is only one handle of this type
+   */
   id?: string;
 };