✨ Major Changes

• #11859 3804711 Thanks @florian-lefebvre! - Changes the default tsconfig.json with better defaults, and makes src/env.d.ts optional

  Astro’s default tsconfig.json in starter examples has been updated to include generated types and exclude your build output. This means that src/env.d.ts is only necessary if you have added custom type declarations or if you’re not using a tsconfig.json file.

  Additionally, running astro sync no longer creates, nor updates, src/env.d.ts as it is not required for type-checking standard Astro projects.

  To update your project to Astro’s recommended TypeScript settings, please add the following include and exclude properties to tsconfig.json:

  {
      "extends": "astro/tsconfigs/base",
      "include": ["**/*", ".astro/types.d.ts"],
      "exclude": ["dist"]
  }

🍿 Minor Changes

• #11911 c3dce83 Thanks @ascorbic! - The Content Layer API introduced behind a flag in 4.14.0 is now stable and ready for use in Astro v5.0.

  The new Content Layer API builds upon content collections, taking them beyond local files in src/content/ and allowing you to fetch content from anywhere, including remote APIs. These new collections work alongside your existing content collections, and you can migrate them to the new API at your own pace. There are significant improvements to performance with large collections of local files. For more details, see the Content Layer RFC.

  If you previously used this feature, you can now remove the experimental.contentLayer flag from your Astro config:

  import { defineConfig } from 'astro'
  
  export default defineConfig({
    experimental: {
      contentLayer: true
    }
  })

  Loading your content

  The core of the new Content Layer API is the loader, a function that fetches content from a source and caches it in a local data store. Astro 4.14 ships with built-in glob() and file() loaders to handle your local Markdown, MDX, Markdoc, and JSON files:

  import { defineCollection, z } from 'astro:content';
  import { glob } from 'astro/loaders';
  
  const blog = defineCollection({
    // The ID is a slug generated from the path of the file relative to `base`
    loader: glob({ pattern: '**/*.md', base: './src/data/blog' }),
    schema: z.object({
      title: z.string(),
      description: z.string(),
      publishDate: z.coerce.date(),
    }),
  });
  
  export const collections = { blog };

  You can then query using the existing content collections functions, and use a simplified render() function to display your content:

  ---
  import { getEntry, render } from 'astro:content';
  
  const post = await getEntry('blog', Astro.params.slug);
  
  const { Content } = await render(entry);
  ---
  
  <Content />

  Creating a loader

  You’re not restricted to the built-in loaders – we hope you’ll try building your own. You can fetch content from anywhere and return an array of entries:

  const countries = defineCollection({
    loader: async () => {
      const response = await fetch('https://restcountries.com/v3.1/all');
      const data = await response.json();
      // Must return an array of entries with an id property,
      // or an object with IDs as keys and entries as values
      return data.map((country) => ({
        id: country.cca3,
        ...country,
      }));
    },
    // optionally add a schema to validate the data and make it type-safe for users
    // schema: z.object...
  });
  
  export const collections = { countries };

  For more advanced loading logic, you can define an object loader. This allows incremental updates and conditional loading, and gives full access to the data store. It also allows a loader to define its own schema, including generating it dynamically based on the source API. See the the Content Layer API RFC for more details.

  Sharing your loaders

  Loaders are better when they’re shared. You can create a package that exports a loader and publish it to npm, and then anyone can use it on their site. We’re excited to see what the community comes up with! To get started, take a look at some examples. Here’s how to load content using an RSS/Atom feed loader:

  import { defineCollection } from 'astro:content';
  import { feedLoader } from '@ascorbic/feed-loader';
  
  const podcasts = defineCollection({
    loader: feedLoader({
      url: 'https://feeds.99percentinvisible.org/99percentinvisible',
    }),
  });
  
  export const collections = { podcasts };

  To learn more, see the Content Layer RFC.

🐞 Patch Changes

• #11902 d63bc50 Thanks @ascorbic! - Fixes case where content layer did not update during clean dev builds on Linux and Windows

• #11914 b5d827b Thanks @ascorbic! - Exports types for all LoaderContext properties from astro/loaders to make it easier to use them in custom loaders. The ScopedDataStore interface (which was previously internal) is renamed to DataStore, to reflect the fact that it’s the only public API for the data store.