从@ngrx/entity/Dictionary 获取错误类型

Question

我有一些基于 NGRX 的映射如下，其中之一正在返回：

Type 'NormalizedAppState[key]' does not satisfy the constraint 'EntityState<NormalizedAppState[key]["entities"][number]>'.
   Type 'InstrumentState' is not assignable to type 'EntityState<NormalizedAppState[key]["entities"][number]>'.
     Types of property 'entities' are incompatible.
       Type 'Dictionary<IInstrument>' is not assignable to type 'Dictionary<NormalizedAppState[key]["entities"][number]>'.
         Type 'IInstrument' is not assignable to type 'NormalizedAppState[key]["entities"] [number]'.

我的映射

//* Minimal NGRX *//

interface DictionaryNum<T> {
    [id: number]: T | undefined;
}
class Dictionary<T> implements DictionaryNum<T> {
    [id: string]: T | undefined;
    // [id: number]: T | undefined; // this solves the problem
}
interface EntityState<T> {
    ids: number[];
    entities: Dictionary<T>;
}

//* *//

const featureNames = {
    instrument: 'instrument',
} as const

interface EntityStateActions<
  TState extends EntityState<TState['entities'][number]>
> {}

interface IInstrument {}

interface InstrumentState extends EntityState<IInstrument> {}

abstract class NormalizedAppState {
  [featureNames.instrument]: InstrumentState;
}

错误

export type NormalizedFeatureActions = {
  [key in keyof typeof featureNames]: EntityStateActions<
    NormalizedAppState[key] --> The error happens here
  >;
};

如果我将 Dictionary<T> 从

更改为 class，错误就会消失

class Dictionary<T> implements DictionaryNum<T> {
    [id: string]: T | undefined;
}

至

class Dictionary<T> implements DictionaryNum<T> {
    [id: number]: T | undefined;
}

但是我不想换第三方class。而且用自己的Dictionary也是有问题的，需要替换其他几种类型

我怎样才能摆脱这个错误？

Playground Link

Answer 1

我找到的解决方案是在我的接口中放置更多的参数，这样他们就不需要通过索引来访问类型了。

interface EntityActions<TEntity,TState extends EntityState<TEntity>>{}

abstract class AppState {
  [featureNames.instrument]: InstrumentState;
}

export type FeatureActions = {
  [featureNames.instrument]: EntityActions<IInstrument,InstrumentState>
};

Solution

从@ngrx/entity/Dictionary 获取错误类型

Getting wrong type from @ngrx/entity/Dictionary

mapping

typescript

typescript-generics

ngrx

ngrx-store