我在减少 Flow 打字错误方面取得了一些进展,但仍然停留在其中的一组错误上。这是我的 Actions 文件中的一些示例代码:
export const ADD_ERROR: 'ADD_ERROR' = 'ADD_ERROR';
export const CLEAR_ERRORS: 'CLEAR_ERRORS' = 'CLEAR_ERRORS';
export const TOGGLE_PROCESSING: 'TOGGLE_PROCESSING' = 'TOGGLE_PROCESSING';
export const RESET_STATE: 'RESET_STATE' = 'RESET_STATE';
export const CLEANUP_INPUT_COMPANY_INFO: 'CLEANUP_INPUT_COMPANY_INFO' = 'CLEANUP_INPUT_COMPANY_INFO';
type AddErrorAction = {type: typeof ADD_ERROR, payload: ValidationError};
type ClearErrorsAction = {type: typeof CLEAR_ERRORS};
type ToggleProcessingAction = {type: typeof TOGGLE_PROCESSING};
type ResetStateAction = {type: typeof RESET_STATE, userRole: Role | ''};
type CleanupInputCompanyInfoAction = {type: typeof CLEANUP_INPUT_COMPANY_INFO};
export type CustomerAction =
| AddErrorAction
| ClearErrorsAction
| ToggleProcessingAction
| ResetStateAction
| CleanupInputCompanyInfoAction;
这是配套的 Reducers 文件(为清楚起见进行了删减):
import { ADD_ERROR,
CLEAR_ERRORS,
TOGGLE_PROCESSING
RESET_STATE,
CLEANUP_INPUT_COMPANY_INFO } from '../actions/Customer';
export const customerReducer = (state: CustomerState, action: CustomerAction) => {
switch (action.type) {
case ADD_ERROR: {
return {
// Code here
};
}
case CLEAR_ERRORS: {
return {
// Code here
};
}
case TOGGLE_PROCESSING: {
return {
// Code here
};
}
case UPDATE_WIZARD_INDEX: {
return {
// Code here
};
}
case RESET_STATE: {
return {
// Code here
};
}
case CLEANUP_INPUT_COMPANY_INFO: {
return {
// Code here
};
}
default: {
return state;
}
}
}
以上代码均未出现错误^^^。
在关联的上下文中是这段代码,它是根据此处概述的方法构建的:https://kentcdodds.com/blog/how-to-use-react-context-effectively
import React, { createContext, useReducer, useContext } from 'react';
import { customerReducer } from './reducers/Customer';
import type { CustomerAction } from './actions/Customer';
import type { UndefinedType } from '../redux/FlowTypes';
import type { ValidationError, User } from './SharedTypes';
import type { Role } from '../utils/constants';
type Dispatch = (action: CustomerAction) => void;
type CustomerState = {
isProcessing: boolean,
wizardIndex: number,
validationErrors: (?ValidationError)[],
companyName: string
};
const defaultState: FleetCustomerState = {
isProcessing: false,
wizardIndex: 0,
validationErrors: [],
companyName: ''
};
const CustomerStateContext = createContext<CustomerState>(defaultState);
const CustomerDispatchContext = createContext<Dispatch | UndefinedType>(undefined);
const CustomerProvider = ({ children }: {children: Object}) => {
const [state: CustomerState, dispatch: Dispatch] = useReducer(customerReducer, defaultState);
return (
<CustomerDispatchContext.Provider value={dispatch}>
<CustomerStateContext.Provider value={state}>
{children}
</CustomerStateContext.Provider>
</CustomerDispatchContext.Provider>
)
}
const useCustomerState = () => {
const context = useContext(CustomerStateContext);
if (context === undefined) {
throw new Error('useCustomerState must be used within a CustomerProvider');
}
return context;
}
const useCustomerDispatch = () => {
const context = useContext(CustomerDispatchContext);
if (context === undefined) {
throw new Error('useCustomerDispatch must be used within a CustomerProvider');
}
return context;
}
export type {CustomerState};
export {CustomerProvider, useCustomerState, useCustomerDispatch};
然后在我的组件中,我这样发送:
dispatch({type: ADD_ERROR, payload: {name, message, id}});
dispatch({type: ADD_ERROR, payload: {name, message}});
dispatch({type: TOGGLE_PROCESSING});
dispatch({type: CLEAR_ERRORS});
我在这些 dispatch
语句中遇到了很多错误。每个错误的措辞略有不同,但具有相同的模式。这里有两个例子:
Cannot call
dispatch
with object literal bound toaction
because: Either string literalTOGGLE_PROCESSING
[1] is incompatible with string literalRESET_STATE
[2] in propertytype
. Or string literalTOGGLE_PROCESSING
[1] is incompatible with string literalCLEANUP_INPUT_COMPANY_INFO
[3] in propertytype
.Cannot call
dispatch
with object literal bound toaction
because: Either string literalCLEAR_ERRORS
[1] is incompatible with string literalRESET_STATE
[2] in propertytype
. Or string literalCLEAR_ERRORS
[1] is incompatible with string literalCLEANUP_INPUT_COMPANY_INFO
[3] in propertytype
.
我不明白如何处理这些错误消息。任何建议将不胜感激!
最佳答案
我最好的猜测:
- 将类型为 UPDATE_WIZARD_INDEX
的操作添加到 CustomerAction
- 使 Action 注释准确。例如,而不是
type AddErrorAction = {type: typeof ADD_ERROR, payload: ValidationError};
尝试
type AddErrorAction = {|type: typeof ADD_ERROR, payload: ValidationError|};
对于所有 Action
关于javascript - 调度操作时的流输入错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/58397390/