流動型聯盟類型模塊出口

Question

是否有模塊出口聯盟類型格式...例如：

// actionTypes.js 
export const CREATE_ACCOUNT = 'CREATE_ACCOUNT' 
export const UPDATE_ACCOUNT = 'UPDATE_ACCOUNT' 
export const DELETE_ACCOUNT = 'DELETE_ACCOUNT' 

// reducer.js 
import * as actionTypes from './actionTypes.js' 

type Action = actionTypes 
export default function(state: Object, action: Action){ ... } 

Answer 1

您可以使用$值到對象的值轉換成聯盟類型。但是，請注意，將字符串分配給常量仍將該值輸入爲string。您需要明確輸入每個變量，或者使用類似$ObjMap的東西。

一個例子可能是這樣的：

// actionTypes.js 
export const CREATE_ACCOUNT: 'CREATE_ACCOUNT' = 'CREATE_ACCOUNT' 
export const UPDATE_ACCOUNT: 'UPDATE_ACCOUNT' = 'UPDATE_ACCOUNT' 
export const DELETE_ACCOUNT: 'DELETE_ACCOUNT' = 'DELETE_ACCOUNT' 

// reducer.js 
import * as actionTypes from './actionTypes.js' 

type Action = $Values<typeof actionTypes>; 
export default function(state: Object, action: Action){ ... }