SheetXL - v1.0.2
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    A value's settings to change (PivotFieldsModel.applyValueSettings); what is absent stays.

    interface ValueSettings {
        function?: Function;
        name?: string;
        numberFormat?: string;
        showAs?: ShowAs | null;
    }
    Index
    function?: Function
    name?: string
    numberFormat?: string

    A format code.

    showAs?: ShowAs | null

    null shows it as it is.