'IntelliJ reporting typescript error for react-bootstrap-table-next

I'm using react-bootstrap-table-next (aka react-bootstrap-table2). I'm getting a Typescript error in IntelliJ on the validator field in my column definition. I can't seem to get around it in IntelliJ although it works OK in the sandbox. Even putting //@ts-ignore on it doesn't help

Here's my column definition:

    const columns: ColumnDescription[] = [
        {
            dataField: 'id',
            text: 'Product ID',
            headerStyle: () => {
                return { width: '20%', textAlign: 'center' };
            }
        },
        {
            dataField: 'name',
            text: 'Product Name',
            sort: true,
            headerStyle: () => {
                return { width: '60%', textAlign: 'center' };
            }
        },
        {
            dataField: 'value',
            text: 'Product value',
            sort: true,
            validator: (newValue, row, column) => {
                if (isNaN(newValue)) {
                    return {
                        valid: false,
                        message: 'This field needs to be a number'
                    };
                }
            },
            headerStyle: () => {
                return { width: '20%', textAlign: 'center' };
            }
        }];