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Initialize a fresh Astro app with bun create astro. The create-astro package detects when you are using bunx and installs dependencies with bun.
terminal
bun create astro

╭─────╮  Houston:
│ ◠ ◡ ◠  We're glad to have you on board.
╰─────╯

 astro   v3.1.4 Launch sequence initiated.

   dir   Where should we create your new project?
         ./fumbling-field

  tmpl   How would you like to start your new project?
         Use blog template
      ✔  Template copied

  deps   Install dependencies?
         Yes
      ✔  Dependencies installed

    ts   Do you plan to write TypeScript?
         Yes

   use   How strict should TypeScript be?
         Strict
      ✔  TypeScript customized

   git   Initialize a new git repository?
         Yes
      ✔  Git initialized

  next   Liftoff confirmed. Explore your project!

         Enter your project directory using cd ./fumbling-field
         Run `bun run dev` to start the dev server. CTRL+C to stop.
         Add frameworks like react or tailwind using astro add.

         Stuck? Join us at https://astro.build/chat

╭─────╮  Houston:
│ ◠ ◡ ◠  Good luck out there, astronaut! 🚀
╰─────╯
Start the dev server with bunx. By default, Bun runs the dev server with Node.js. To use the Bun runtime instead, pass the --bun flag.
terminal
bunx --bun astro dev

  🚀  astro  v3.1.4 started in 200ms

  ┃ Local    http://localhost:4321/
  ┃ Network  use --host to expose
Open http://localhost:4321 in your browser to see the result. Astro hot-reloads the app as you edit your source files.
See the Astro docs.