打字稿从装饰者看道具

Question

我有一个简单的组件,使用像这样的mobx和装饰器

import * as React from "react";
import { observer, inject } from "mobx-react/native";
import { Router as ReactRouter, Switch, Route } from "react-router-native";
import Dashboard from "./_dashboard";
import { RouterInterface } from "../store/_router";

// -- types ----------------------------------------------------------------- //
export interface Props {
  router: RouterInterface;
}

@inject("router")
@observer
class Router extends React.Component<Props, {}> {
  // -- render -------------------------------------------------------------- //
  render() {
    const { router } = this.props;
    return (
      <ReactRouter history={router.history}>
        <Switch location={router.location}>
          <Route path="/" component={Dashboard} />
        </Switch>
      </ReactRouter>
    );
  }
}

export default Router;

基本上@inject("router")补充this.props.router说满足上面的Props接口,但是打字稿不考虑这个,每当我在某个地方使用这个组件时,如果我没有传递router道具,我会得到一个错误,因此我需要改为router?: RouterInterface;哪个好,但不理想.

有没有办法解决这个问题,其中typescript帐户装饰器注入道具？

Answer 1

有一种方法可以解决这个问题。
您可以在单独的接口中声明注入的 props，然后编写 getter 函数。我在这里写过：
https://gist.github.com/JulianG/18af9b9ff582764a87639d61d4587da1#a-slightly-better-solution

interface InjectedProps {
  bananaStore: BananaStore; //  no question mark here
}

interface BananaProps {
  label: string;
}

class BananaComponent extends Component<BananaProps> {

  get injected(): InjectedProps {
    return this.props as BananaProps & InjectedProps;
  }

  render() {
    const bananas = this.injected.bananaStore.bananas; //  no exclamation mark here
    return <p>{this.props.label}:{bananas}</p>
  }

}