尝试过滤道具会引发TypeError：无法读取未定义的属性“ filter”

Question

执行mapStateToProps之后，我想根据数组中的元素过滤属性。但这会引发类型错误

const mapStateToProps = (state) => {
    console.log(state)
    return {
        hires: state.firestoreHires.ordered.hires
    }
}

const importHires = this.props.hires.filter(item => item.hireType == "import")