SOLID example

App.tsx

import { useEffect, useState } from "react";
import RequestCatFactService from "./RequestCatFactService";

export default function App() {
  const [fact, setFact] = useState("");

  useEffect(() => {
    RequestCatFactService().then((res) => {
      setFact(res);
    });
  }, []);

  return (
    <div className="App">
      <h1>Cat Facts</h1>
      <p>{fact}</p>
    </div>
  );
}

RequestCatFactService.ts

import RequestFactory from "./RequestFactory";

export default (): Promise<string> => {
  return new Promise((resolve, reject) => {
    RequestFactory("https://cat-fact.herokuapp.com/facts")
      .then((res) => resolve((res as CatFactsResponse)[0].text))
      .catch((error) => reject(error));
  });
};

type CatFactsResponse = Array<{
  text: string;
}>;

RequestFactory.ts

import RequestAxios from "./RequestAxios";
import RequestFake from "./RequestFake";

export default (url: string) => {
  const enableFakeData =
    new URL(window.location.href).searchParams.get("enableFakeData") === "1";

  return enableFakeData ? RequestFake(url) : RequestAxios(url);
};