reactjs - React useState Hook 错误 : Argument of type 'xxx' is not assignable to parameter of type 'SetStateAction'

Question

我使用 react Hook 进行更新，但在 setState 时会注意到错误。

Argument of type '{ alertRules: any; }' is not assignable to parameter of type 'SetStateAction'. Object literal may only specify known properties, and 'alertRules' does not exist in type 'SetStateAction'.ts(2345)

这是我的代码。

import React, { useState, useEffect } from 'react';
import { FieldArray } from 'redux-form';
import { CoordinateSelect } from '~/fields';
import lodash from 'lodash';
import { connect } from 'react-redux';
import { filterDispatchers } from '~/actions';
import t from '~/locale';

interface Props {
  getAlertRules(o: object): Promise<any>;
}
type Alert = {
  ...
}

const connector = connect(
  null,
  filterDispatchers('getAlertRules'),
);

const AlertRuleForm = (props: Props) => {
  const [alertRules, setAlertRules] = useState<Alert[]>([]);
  useEffect(() => {
    fetchData();
  }, []);

  const fetchData = async () => {
    const actionResult = await props.getAlertRules({ limit: -1 });
    const alertRules = lodash.get(actionResult, 'response.alertRules', []);
    setAlertRules({ alertRules });    //Error form here
  };

  const groupedRules = lodash.groupBy(alertRules, 'resourceType');
  const levelTypes = lodash.uniq(alertRules.map((alert: Alert) => alert.level));
  return (
    <FieldArray
      name="alertRules"
      component={CoordinateSelect}
      label={t('告警规则')}
      firstOptions={lodash.keys(groupedRules)}
      secondOptions={groupedRules}
      thirdOptions={levelTypes}
      required
    />
  );
};
export default connector(AlertRuleForm);

错误是在设置状态时

Argument of type '{ alertRules: any; }' is not assignable to parameter of type 'SetStateAction'. Object literal may only specify known properties, and 'alertRules' does not exist in type 'SetStateAction'.ts(2345)

Answer 1

简短回答 :- 从 setAlertRules 语句中删除花括号，因为它会导致 type 之间的不一致的 setAlertRules在定义及其用法。

这是 ES6 的特性，称为 对象文字速记 .

在定义 alertRules 时，setAlertRules 的类型是 SetStateAction 。你试图给它类型 {alertRules: any} 的值，这会导致错误。

传递给 alertRules 的值是一个带有键 alertRules 的对象其值为 Alert 类型的数组.

所以，删除花括号，因为它被转换成这样的东西

 setAlertRules({ alertRules: alertRules  }); 
  // now {alertRules: any} this thing will make sense 

试试这个代码来更新 alertRules 。

// see no curly braces .
 setAlertRules( alertRules );