Selection

const snapshot = editor.selection.getSnapshot();

snapshot.empty;            // caret rather than a range
snapshot.text;             // the selected text
snapshot.target;           // portable ranges for comments and formatting
snapshot.selectionTarget;  // explicit start/end for insert and replace
snapshot.activeMarks;      // ["bold", "italic"]
snapshot.activeCommentIds;
snapshot.activeChangeIds;

useEffect(() => editor.selection.observe(setSelection), [editor]);

const capture = editor.selection.capture();
// The user types in your popover. The editor loses focus.
const result = editor.selection.restore(capture);

if (!result.success) {
  // The captured blocks were moved or deleted.
}

editor.selection.clear();