Geting the get_maximumvalue() from a NumberField (SP.FieldNumber) not working (SharePoint Online, SharePoint Hosted APP / Javascript)

Hello,

i´m developing a SharePoint Hosted App in SharePoint Online and wont get/set the max and min value of a number Field. The solution what I found did not work:

        var list: SP.List = mfsctx.HostWeb().get_lists().getById(listId);
        var listFields: SP.FieldCollection = list.get_fields();
        var field: SP.Field = listFields.getByInternalNameOrTitle(internalName);
        var fieldAsNumber = mfsctx.AppContext().castTo(field, SP.FieldNumber);

mfsctx.AppContext().load(fieldAsNumber);

            mfsctx.AppContext().executeQueryAsync(
                successHandler,
                errorHandler
                );

            function successHandler() {

                var b = fieldAsNumber.get_minimumValue();
                var c = fieldAsNumber.get_maximumValue();

I can not compile this on TypeScript. But if I go with the MousePointer over "get_minimumValue();" I can read the Message: 

- "Property get_minimumValue() does not exist on Type Client Object"

- On Microsoft: https://msdn.microsoft.com/en-us/library/office/jj246071.aspx

What take I wrong?

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