Add delete interaction link command

src/commands/delete-interaction-link-command.ts

@@ -0,0 +1,50 @@
+import { createOpaqueId } from "../core/ids";
+import { cloneInteractionLink } from "../interactions/interaction-links";
+
+import type { EditorCommand } from "./command";
+
+export function createDeleteInteractionLinkCommand(linkId: string): EditorCommand {
+  let previousLink = null as ReturnType<typeof cloneInteractionLink> | null;
+
+  return {
+    id: createOpaqueId("command"),
+    label: "Delete interaction link",
+    execute(context) {
+      const currentDocument = context.getDocument();
+      const currentLink = currentDocument.interactionLinks[linkId];
+
+      if (currentLink === undefined) {
+        throw new Error(`Interaction link ${linkId} does not exist.`);
+      }
+
+      if (previousLink === null) {
+        previousLink = cloneInteractionLink(currentLink);
+      }
+
+      const nextInteractionLinks = {
+        ...currentDocument.interactionLinks
+      };
+      delete nextInteractionLinks[linkId];
+
+      context.setDocument({
+        ...currentDocument,
+        interactionLinks: nextInteractionLinks
+      });
+    },
+    undo(context) {
+      if (previousLink === null) {
+        return;
+      }
+
+      const currentDocument = context.getDocument();
+
+      context.setDocument({
+        ...currentDocument,
+        interactionLinks: {
+          ...currentDocument.interactionLinks,
+          [previousLink.id]: cloneInteractionLink(previousLink)
+        }
+      });
+    }
+  };
+}