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next is currently in pre mode so this branch has prereleases rather than normal releases. If you want to exit prereleases, run changeset pre exit on next.

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Releases

astro@7.0.0-alpha.2

Major Changes

• #16610 c63e7e4 Thanks @matthewp! - Adds background dev server management for AI coding agents.

  When an AI coding agent is detected, astro dev now automatically starts the dev server as a detached background process. This prevents the dev server from blocking the agent's terminal and allows it to continue working while the server runs.

  A lock file (.astro/dev.json) is written when the dev server starts, recording the server's URL, port, and PID. This prevents duplicate servers from being started for the same project.

  New flag and subcommands

  • astro dev --background — Start the dev server as a background process (this is what runs automatically when an agent is detected).
  • astro dev stop — Stop a running background dev server.
  • astro dev status — Check if a dev server is running and display its URL, PID, and uptime.
  • astro dev logs — View logs from a background dev server. Use --follow (-f) to stream new output as it's written.

  These allow you to start and manage dev servers programmatically and were designed with AI coding agents in mind.

  What should I do?

  No action is required. If you are not using an AI coding agent, astro dev behaves exactly as before. If you are using an agent, background mode is enabled automatically — the agent will receive the server URL and PID, and can use astro dev stop to shut it down.

  To opt out of automatic background mode when an agent is detected, set the environment variable ASTRO_DEV_BACKGROUND=0 before running astro dev.

• #16725 10229f7 Thanks @ArmandPhilippot! - Removes deprecated APIs exported from astro:transitions.

  In Astro 6.x, some helpers available in astro:transitions and astro:transitions/client were deprecated.

  In Astro 7.0, the following APIs can no longer be used in your project:

  • TRANSITION_BEFORE_PREPARATION
  • TRANSITION_AFTER_PREPARATION
  • TRANSITION_BEFORE_SWAP
  • TRANSITION_AFTER_SWAP
  • TRANSITION_PAGE_LOAD
  • isTransitionBeforePreparationEvent()
  • isTransitionBeforeSwapEvent()
  • createAnimationScope()

  What should I do?

  Remove any occurrence of createAnimationScope():

  -import { createAnimationScope } from 'astro:transitions';

  Replace any occurrence of the other APIs using the lifecycle event names directly:

  -import {
  -	TRANSITION_AFTER_SWAP,
  -	isTransitionBeforePreparationEvent,
  -} from 'astro:transitions/client';
  
  -console.log(isTransitionBeforePreparationEvent(event));
  +console.log(event.type === 'astro:before-preparation');
  
  -console.log(TRANSITION_AFTER_SWAP);
  +console.log('astro:after-swap');

  Learn more about all utilities available in the View Transitions Router API Reference.

@astrojs/svelte@9.0.0-alpha.2

Minor Changes

• #16549 9d9d516 Thanks @ocavue! - Updates @sveltejs/vite-plugin-svelte to v7. No user action is necessary.

@astrojs/markdown-satteri@0.3.0-alpha.0

Minor Changes

• #16969 4a31f90 Thanks @Princesseuh! - Adds support for Prism syntax highlighting to the Sätteri Markdown and MDX processors. Setting markdown.syntaxHighlight to 'prism' now highlights your code blocks with Prism.

  // astro.config.mjs
  import { satteri } from '@astrojs/markdown-satteri';
  
  export default defineConfig({
    markdown: {
      processor: satteri(),
      syntaxHighlight: 'prism',
    },
  });

@astrojs/cloudflare@14.0.0-alpha.1

Patch Changes

• #16671 fd926fd Thanks @alexanderniebuhr! - Removes deprecations warnings added in Astro v6 for Cloudflare specific Astro.locals properties.

• Updated dependencies [c63e7e4, 10229f7]:

  • astro@7.0.0-alpha.2
  • @astrojs/underscore-redirects@1.0.3

@astrojs/mdx@6.0.0-alpha.1

Patch Changes

• #16969 4a31f90 Thanks @Princesseuh! - Adds support for Prism syntax highlighting to the Sätteri Markdown and MDX processors. Setting markdown.syntaxHighlight to 'prism' now highlights your code blocks with Prism.

  // astro.config.mjs
  import { satteri } from '@astrojs/markdown-satteri';
  
  export default defineConfig({
    markdown: {
      processor: satteri(),
      syntaxHighlight: 'prism',
    },
  });

• Updated dependencies [4a31f90]:

  • @astrojs/markdown-satteri@0.3.0-alpha.0