Which popular React framework introduced strong built in support for Server Components?

Next.js, one of the most widely used React frameworks, added first class support for Server Components starting with its app router, making Server Components the default for every new page unless you explicitly mark a component as a Client Component using the use client directive.

// app/page.js in a Next.js project, this is a Server Component by default
export default async function HomePage() {
  const news = await fetchLatestNews();
  return <NewsList articles={news} />;
}