@openbim/ifc
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    Interface HistoryChange

    What IfcModel.undo or IfcModel.redo restored.

    interface HistoryChange {
        created: bigint[];
        header: boolean;
        modified: bigint[];
        removed: bigint[];
    }
    Index
    created: bigint[]

    Entities absent before, present after.

    header: boolean

    Whether the file header changed.

    modified: bigint[]

    Entities present both times whose content changed.

    removed: bigint[]

    Entities present before, absent after.