响应redux typescript错误

尝试用react/redux实现typescript,我的类型遇到了一些问题。

我有这些类型:

export interface IAuthState {
  isSignedIn: Boolean | null;
  userId: string | null;
}

export interface IStream {
  id: string;
  title: string;
  description: string;
  userId: string;
}

export interface IStreamState {
  streams: { [index: string]: IStream };
}

然后我有两个部分:

interface IStreamsProps {
  fetchStreams: () => void;
  streams: IStreamState;
  currentUserId: String | null;
  isSignedIn: Boolean | null;
  auth: IAuthState;
}

class StreamsList extends Component<IStreamsProps, IAppState> {
   // Error: The Property Map does not exist on type IStreamState
   renderList() {
       return this.props.streams.map((stream: IStream) => (// CODE)
   }
}


const mapStateToProps = (state: IAppState) => {
  return {
    streams: Object.values(state.streams),
    currentUserId: state.auth.userId,
    isSignedIn: state.auth.isSignedIn
  };
};

export default connect(
  mapStateToProps,
  { fetchStreams }
)(StreamsList);

然后我有另一个类似的组件:

const mapStateToProps = (state: IAppState, ownProps: HomeProps) => {
  return {
    //Error: Element implicitly has an 'any' type because expression of type 'any' can't be used to index type 'IStreamState'
    stream: state.streams[ownProps.match.params.id]
  };
};

export default connect(
  mapStateToProps,
  null
)(StreamEdit);

如何解决这两个错误:

错误1:IStreamState类型上不存在属性映射

错误2:元素隐式具有“any”类型,因为“any”类型的表达式不能用于索引类型“istreamState”