延迟加载模块中具有ActionReducerMap的ngrx实体

Question

@ngrx/entity可以与延迟加载模块ActionReducerMap<State>中的StoreModule.forFeature<>()一起使用。

使用它时，在浏览器控制台日志中出现以下错误。

ERROR TypeError: Cannot read property 'map' of undefined
    at ngrx-entity.js:67
    at ngrx-store.js:1096
    at memoized (ngrx-store.js:1011)
    at defaultStateFn (ngrx-store.js:1051)
    at ngrx-store.js:1105
    at memoized (ngrx-store.js:1011)
    at ngrx-store.js:1096
    at memoized (ngrx-store.js:1011)
    at defaultStateFn (ngrx-store.js:1051)
    at ngrx-store.js:1105