DataTable sortField allows a function, but the prop type is only a string

[richardmward]

Hi,

The docs say that you can use the sortField on a DataTable Column, as such (data) => customFieldResolver(...). The implementation works as it falls into ObjectUtils.resolveFieldData, which checks for typeof === "function", however the Column props type is set to String so the console is filled with warnings. It'd be nice if the prop type could be altered to allow either a string or function, avoiding these errors.