反应打字稿错误解析错误：'>'预期

Question

I am migrating js to ts and have an error with my modified code:

Line 26:8: Parsing error: '>' expected

import React from "react";
import { Route, Redirect, RouteProps } from "react-router-dom";
import {render} from "react-dom"
import {AppProps} from "../App"

function querystring(name: string, url = window.location.href) {
  name = name.replace(/[[]]/g, "\\$&");

  const regex = new RegExp("[?&]" + name + "(=([^&#]*)|&|#|$)", "i");
  const results = regex.exec(url);

  if (!results) {
    return null;
  }
  if (!results[2]) {
    return "";
  }

  return decodeURIComponent(results[2].replace(/\+/g, " "));
}
export default function UnauthenticatedRoute({ component: C, appProps, ...rest }:
                                                 RouteProps & {appProps: AppProps}) {
  const redirect = querystring("redirect");
  return (
    <Route
        {...rest} // the issue is here
        render={ props => !appProps.isAuthenticated ?
            <C {...props} {...appProps} />
          :
            <Redirect to={redirect === "" || redirect === null ? "/" : redirect}/>
    }
    />
  );
}

If someone sees the problem, that would be kind :). Thanks!

---

Solution

1/ File needs to have tsx extension

2/ syntax was also wrong in the tsx syntax. I changed to this and now it's ok:

export default function UnauthenticatedRoute({ component: C, appProps, ...rest }:
                                                 RouteProps & {appProps: AppProps}) {
  const redirect = querystring("redirect");
  return (
    <Route {...rest}
        render={ props => !appProps.isAuthenticated ?
            <C {...props} {...appProps} />
          :
            <Redirect to={redirect === "" || redirect === null ? "/" : redirect}/>
        }
    />
  );
}

Now I have another issue with binding element 'C', but it's another story.

Thanks everyone!

Answer 1

将文件扩展名从.ts更改为.tsx 。

Answer 2

请注意：返回 react-dom 时，请始终使用 TSX，否则使用 TS