Astro Bug Reproduction

Description

This repo is a reproduction; two routes have been created for demo purposes:

• src/example/[...slug].ts
• src/api/example/[...slug].ts

Expectation

When using params in a getStaticPaths function, I would expect undefined to result in the creation of an index route.

Actual Behaviour

The build fails in Vercel

Success: Without undefined params

• Deployment: https://vercel.com/joebell/astro-bug-params-undefined/4G9AqahtnJTsvXzCP6Z97H55ze73

19:36:18.324	▶ src/pages/example/[...slug].astro
19:36:18.345	  ├─ /example/one/index.html (+21ms)
19:36:18.347	  ├─ /example/two/index.html (+23ms)
19:36:18.348	  └─ /example/three/index.html (+25ms)
19:36:18.349	λ src/pages/api/example/[...slug].ts
19:36:18.350	  ├─ /api/example/one (+1ms)
19:36:18.351	  ├─ /api/example/two (+2ms)
19:36:18.351	  └─ /api/example/three (+3ms)
19:36:18.351	Completed in 59ms.

Error: With undefined params

• Deployment: https://vercel.com/joebell/astro-bug-params-undefined/Fj1im5wqsKA6XdVn2VhGkWrkSFja

▶ src/pages/example/[...slug].astro
19:39:10.815	  ├─ /example/one/index.html (+18ms)
19:39:10.817	  ├─ /example/two/index.html (+19ms)
19:39:10.818	  ├─ /example/three/index.html (+21ms)
19:39:10.820	  └─ /example/index.html (+22ms)
19:39:10.820	λ src/pages/api/example/[...slug].ts
19:39:10.821	  ├─ /api/example/one (+1ms)
19:39:10.822	  ├─ /api/example/two (+2ms)
19:39:10.822	  ├─ /api/example/three (+3ms)
19:39:10.911	 error   EISDIR: illegal operation on a directory, open '/vercel/path0/.vercel/output/static/api/example'
19:39:10.911	Error: EISDIR: illegal operation on a directory, open '/vercel/path0/.vercel/output/static/api/example'
19:39:10.926	 ELIFECYCLE  Command failed with exit code 1.
19:39:10.940	Error: Command "pnpm run build" exited with 1

---

Astro Starter Kit: Basics

pnpm create astro@latest -- --template basics

🧑‍🚀 Seasoned astronaut? Delete this file. Have fun!

🚀 Project Structure

Inside of your Astro project, you'll see the following folders and files:

/
├── public/
│   └── favicon.svg
├── src/
│   ├── components/
│   │   └── Card.astro
│   ├── layouts/
│   │   └── Layout.astro
│   └── pages/
│       └── index.astro
└── package.json

Astro looks for .astro or .md files in the src/pages/ directory. Each page is exposed as a route based on its file name.

There's nothing special about src/components/, but that's where we like to put any Astro/React/Vue/Svelte/Preact components.

Any static assets, like images, can be placed in the public/ directory.

🧞 Commands

All commands are run from the root of the project, from a terminal:

Command	Action
pnpm install	Installs dependencies
pnpm run dev	Starts local dev server at localhost:3000
pnpm run build	Build your production site to ./dist/
pnpm run preview	Preview your build locally, before deploying
pnpm run astro ...	Run CLI commands like astro add, astro check
pnpm run astro --help	Get help using the Astro CLI

👀 Want to learn more?

Feel free to check our documentation or jump into our Discord server.