docs: add tsdoc for certain element props (#2673)

Co-authored-by: Panayiotis Lipiridis <lipiridis@gmail.com>

src/element/types.ts

@@ -27,11 +27,21 @@ type _ExcalidrawElementBase = Readonly<{
   width: number;
   height: number;
   angle: number;
+  /** Random integer used to seed shape generation so that the roughjs shape
+      doesn't differ across renders. */
   seed: number;
+  /** Integer that is sequentially incremented on each change. Used to reconcile
+      elements during collaboration or when saving to server. */
   version: number;
+  /** Random integer that is regenerated on each change.
+      Used for deterministic reconciliation of updates during collaboration,
+      in case the versions (see above) are identical. */
   versionNonce: number;
   isDeleted: boolean;
+  /** List of groups the element belongs to.
+      Ordered from deepest to shallowest. */
   groupIds: readonly GroupId[];
+  /** Ids of (linear) elements that are bound to this element. */
   boundElementIds: readonly ExcalidrawLinearElement["id"][] | null;
 }>;
 

src/packages/excalidraw/CHANGELOG.md

@@ -51,6 +51,10 @@ Please add the latest change on the top under the correct section.
 
 - Bump ini from 1.3.5 to 1.3.7 in /src/packages/excalidraw [#2500](https://github.com/excalidraw/excalidraw/pull/2500)
 
+### Docs
+
+- Document some of the more exotic element props [#2673](https://github.com/excalidraw/excalidraw/pull/2673)
+
 ## 0.1.1
 
 #### Fix