How to use the prosemirror-state.Selection.atEnd function in prosemirror-state

test('findNodeAtSelection', () => {
    const selection = Selection.atEnd(pmDoc);
    const { node, pos, start } = findNodeAtSelection(selection);
    expect(node).toBe(expectedEnd);
    expect(pos).toBe(16);
    expect(start).toBe(17);
  });
});

"Mod-a": (state, dispatch) => {
    const textSelection = new TextSelection(
      Selection.atStart(state.doc).$anchor,
      Selection.atEnd(state.doc).$head
    );
    dispatch(state.tr.setSelection(textSelection));
    return true;
  }
});

export const findNodeAtEndOfDoc = (doc: ProsemirrorNode) => findNodeAtPosition(PMSelection.atEnd(doc).$from);