ngxs labs immer 要求完整状态？

Question

我严格按照 ngxs/labs immer 文档来调整我的代码并发现了这个奇怪的行为。

为什么 setState 要求所有状态属性：

  export class DadesStateModel {
    apartats: IApartat[];
    authors: IAuthor[];
  }  
  (...)
  @Action(SetArticles)
  @ImmutableContext()
  setArticles({setState}: StateContext<DadesStateModel>, {apartat}: SetArticles) {
    setState((state: DadesStateModel) => ({
      state.apartats[state.apartats.findIndex(ap=>ap.Id===apartat.Id)] = apartat;
      return state;
    }))
  }

出现以下错误消息：

Argument of type '(state: DadesStateModel) => { state: DadesStateModel; (Missing): IApartat; return: DadesStateModel; }' is not assignable to parameter of type 'DadesStateModel | StateOperator<DadesStateModel>'.
  Type '(state: DadesStateModel) => { state: DadesStateModel; (Missing): IApartat; return: DadesStateModel; }' is not assignable to type 'StateOperator<DadesStateModel>'.
    Type '{ state: DadesStateModel; (Missing): IApartat; return: DadesStateModel; }' is missing the following properties from type 'DadesStateModel': authors.

Answer 1

尽管我的回答来得有点晚：您看到此错误是由于句法错误。您正在用方括号 ({}) 将 lambda 中的封闭 {} 包裹起来，因此它假设您打算成为 lambda 的主体的是 lambda 的 return 值。只需删除封闭的括号即可。

setState((state: DadesStateModel) => { // Instead of "({"
  state.apartats[state.apartats.findIndex(ap=>ap.Id===apartat.Id)] = apartat;
  return state;
}); // Instead of "}));"

ngxs labs immer 要求完整状态？

ngxs labs immer asking for full state?

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