solution for conditional props react

App.js

import Component from "./Component";
import "./styles.css";
import { useState } from "react";
import { Check, Random } from "./random";

/**
 * @Question
 *Implement a theme switcher.that can switch between themes in entire application.
 */

export default function App() {
  const [isDark, setIsDark] = useState(false);
  const handleThemeChange = () => {
    setIsDark((p) => {
      return !p;
    });
    if (!isDark) {
      document.body.classList.add("dark");
    } else {
      document.body.classList.remove("dark");
    }
  };

  return (
    <div className={`App ${isDark ? "dark" : ""}`}>
      <h1>Velorona Frontend Technical Test</h1>
      <Component />
      <button
        onClick={() => {
          handleThemeChange();
        }}
      >
        toggle
      </button>
      <div>
        <Random success={true} data="success-> data" />
        <Random success={false} error="no success -> error" />
      </div>
    </div>
  );
}

random.tsx

/**
  * codesandbox was aparently bugged out with this solution.
  * tried same in local and was working fine.
  */

import React from 'react'

type TProps =
  | {
      success: true
      data: string
    }
  | {
      success: false
      error: string
    }

export function Random(props: TProps) {
  return <div>{props.success ? props.data : props.error}</div>
}

style.css

.App {
  font-family: sans-serif;
  text-align: center;
}

.section {
  width: 200px;
  height: 400px;
  border: 2px solid red;
}
.invervals {
  display: flex;
  width: 100%;
}

.dark {
  background-color: black;
  color: white;
}