@openbim/ifc
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    Interface HistoryState

    What IfcModel.history reports.

    interface HistoryState {
        limit: number;
        redo: number;
        undo: number;
    }
    Index
    limit: number

    The bound on undo entries; 0 while history is off.

    redo: number

    Entries IfcModel.redo can step forward through.

    undo: number

    Entries IfcModel.undo can step back through.