Cached Functions

async function getData() {
  // !mark
  'use cache';
  // ...
}

async function ProductList() {
  const products = await getData();
  // ...
}

export default async function Page() {
  return <ProductList />;
}

Demo

• The data fetching function to get the list of products is annotated with use cache.
• An artificial one second delay is added to the function to make the difference more noticeable.
• Since the function is cacheable, the delay only happens the first time the function is called.
• layout.tsx, page.tsx and <ProductList> aren't explicitly annotated with use cache, but Next.js infers they're static because they do not use any Dynamic APIs. If they started to, Next.js will guide the developer to either add use cache or a <Suspense> boundary.

Notes

• This demo uses the experimental use cache directive and describes caching behavior once stable.