Using sortOrder to sort table in descending order in ant design

using sortOrder to sort table in descending order in ant design (using typescript)
colums is set as follows:
{

title: "",
dataIndex: "turnover",
key: "turnover",
sortOrder: "descend",
sorter: (a, b) => a.turnover - b.turnover,

},

error message:
Types of property "sortOrder" are incompatible.
Type" string" is not assignable to type""descend" | "ascend" | undefined".

the official website documents are described as follows:

May.14,2021

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