<function name="PreUndo" parent="GM" type="hook"> <description>Called just before performing an undo.</description> <realm>Server</realm> <added>2021.03.31</added> <args> <arg name="undo" type="table">The undo table. See <page text="Undo">Structures/Undo</page> struct.</arg> </args> <rets> <ret name="" type="boolean">Return false to disallow the undo.</ret> <ret name="" type="boolean">Return `false` to disallow the undo.</ret> </rets> </function>