SheetXL - v1.0.2
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    What Insert Slicer offers: the fields a slicer can filter by, and the one the active cell is in, which a press filters by.

    interface InsertSlicer {
        anchor: () => string | null;
        fields: () => readonly string[];
    }
    Index
    anchor: () => string | null

    The field the active cell is in; null when it is in none, as on a pivot table's values.

    fields: () => readonly string[]

    A table's column names, or a pivot table's field names, in order.