@jsfkit/types
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    Type Alias PivotSubtotalFunction

    PivotSubtotalFunction:
        | "sum"
        | "countA"
        | "avg"
        | "max"
        | "min"
        | "product"
        | "count"
        | "stdDev"
        | "stdDevP"
        | "var"
        | "varP"

    The subtotal aggregation functions that can be applied to a pivot field.

    Beware of the 'count' false cognate: here it means "count of numeric values" (like the COUNT worksheet function), while in PivotDataFieldAggregation 'count' means "count of non-empty values" (like the COUNTA worksheet function).