akihisa-shimada

const fetcher = async(url: string): Promise<any> => {
    const res = await fetch(url).then(res => res.json());
    return res;
}

export const getUser = async(): Promise<any>  => {
    const user = await fetcher('https://example.com/api/user');
    return user;
}

akihisa-shimada

interface Lengthwise {
  length: number;
}

function loggingIdentity<T>(arg: T): T {
  console.log(arg.length);
  // -> Property 'length' does not exist on type 'T'.(2339)
  return arg;
}

akihisa-shimada

function identity<T>(arg: T): T {
  return arg;
}

console.log(identity<string>("string"));
console.log(identity(1));

akihisa-shimada

interface Lengthwise {
  length: number;
}

function loggingIdentity<T extends Lengthwise>(arg: T): T {
  console.log(arg.length);
  return arg;
}

loggingIdentity(['hello world'])

akihisa-shimada

import { Helmet, HelmetProvider } from "react-helmet-async";

const faqSchema = {
  "@context": "https://schema.org",
  "@type": "FAQPage",
  mainEntity: [
    {
      "@type": "Question",
      name: "よくある質問",
      acceptedAnswer: {