Angular6 ngrx和导出成员错误[没有导出成员]

我正在使用ngrx，但我得到如下错误[6]

ERROR in src/app/app.component.ts(3,10): error TS2305: Module '"C:/Angular Activity/NgRxExample/currency-conversion/src/app/actions/amount"'
has no exported member 'AmountChangeAction'.
src/app/app.module.ts(6,9): error TS2305: Module '"C:/Angular Activity/NgRxExample/currency-conversion/src/app/actions/amount"' has no exported member 'AmountChangeAction'.
src/app/reducers/amount.ts(4,58): error TS2694: Namespace '"C:/Angular Activity/NgRxExample/currency-conversion/src/app/actions/amount"' has
no exported member 'AmountChangeAction'.
src/app/reducers/amount.ts(7,21): error TS2339: Property 'AMOUNTCHANGE' does not exist on type 'typeof import("C:/Angular Activity/NgRxExample/currency-conversion/src/app/actions/amount")'

货币兑换税

import {Currency} from './../models/currency';
import { Action } from '@ngrx/store';

export const  CURRENCIESUPDATE  = '[Currency] UpdateAll';
export const  CURRENCIESUPDATED = '[Currency] UpdatedAll';

export class CurrenciesUpdateAction implements Action {
    readonly type =  CURRENCIESUPDATE
}

export class CurrenciesUpdatedAction implements Action {
    readonly type =  CURRENCIESUPDATED
    constructor(public payload: Currency[]) {}
}

金额：1.ts：

import {Currency} from './../models/currency';
import { Action } from '@ngrx/store';

export const  CURRENCIESUPDATE  = '[Currency] UpdateAll';
export const  CURRENCIESUPDATED = '[Currency] UpdatedAll';

export class CurrenciesUpdateAction implements Action {
    readonly type =  CURRENCIESUPDATE
}

export class CurrenciesUpdatedAction implements Action {
    readonly type =  CURRENCIESUPDATED
    constructor(public payload: Currency[]) {}
}

请让我知道这是什么遗漏，我是第一次使用ngrx，所以请原谅，如果这是非常愚蠢的

我用的是角度6

My package.json：

"dependencies": {
    "@angular/animations": "~7.2.0",
    "@angular/common": "~7.2.0",
    "@angular/compiler": "~7.2.0",
    "@angular/core": "~7.2.0",
    "@angular/forms": "~7.2.0",
    "@angular/platform-browser": "~7.2.0",
    "@angular/platform-browser-dynamic": "~7.2.0",
    "@angular/router": "~7.2.0",
    "@ngrx/core": "^1.2.0",
    "@ngrx/effects": "^7.4.0",
    "@ngrx/store": "^7.4.0",
    "core-js": "^2.5.4",
    "rxjs": "~6.3.3",
    "tslib": "^1.9.0",
    "zone.js": "~0.8.26"
  },

---

从共享的代码片段来看，看起来确实没有

AmountChangeAction

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