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astro/packages/integrations/vercel/README.md
Juan Martín Seery 114bf63e11
refactor(vercel): Build Output API v3 (#3216)
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* Migration to v3

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* Remove legacy redirects

* Fail when there is no ENABLE_VC_BUILD

* Fix edge

* Updated readme

* Changeset

* Added static mode

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* Made edge work!

* Updated changeset

* Ensure empty dir

* Fixed redirects for dynamic paths

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* Fixed some urls

* Deprecated shim!

* [test]: Vercel NFT

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* Edge bundle to node 14.19

Vercel runs 14.19.1 (I've checked it manually)

* Re-added shim (#3304)

* Added `node:` prefix

* Use the same bundling as Deno for Edge

* Remove esbuild

* Fixed shim

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* fix typo

* Added support for Node 16 (vercel/vercel#7772)
2022-05-11 15:10:38 -06:00

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# @astrojs/vercel
Deploy your server-side rendered (SSR) Astro app to [Vercel](https://www.vercel.com/).
Use this integration in your Astro configuration file:
```js
import { defineConfig } from 'astro/config';
import vercel from '@astrojs/vercel/serverless';
export default defineConfig({
adapter: vercel()
});
```
When you build your project, Astro will know to use the `.vercel/output` folder format that Vercel expects.
## Deploying
You can deploy by CLI (`vercel deploy`) or by connecting your new repo in the [Vercel Dashboard](https://vercel.com/). Alternatively, you can create a production build locally:
```sh
ENABLE_VC_BUILD=1 astro build
vercel deploy --prebuilt
```
## Requirements
**Vercel's [Build Output API](https://vercel.com/docs/build-output-api/v3) must be enabled.** You must enable it yourself by setting the environment variable: `ENABLE_VC_BUILD=1`.
```js
// vercel.json
{
"build": {
"env": {
"ENABLE_VC_BUILD": "1"
}
}
}
```
[Learn more about setting enviroment variables in Vercel](https://vercel.com/docs/concepts/projects/environment-variables).
## Targets
You can deploy to different targes:
- `edge`: SSR inside a [Edge function](https://vercel.com/docs/concepts/functions/edge-functions).
- `serverless`: SSR inside a [Node.js function](https://vercel.com/docs/concepts/functions/serverless-functions).
- `static`: generates a static website following Vercel's output formats, redirects, etc.
> **Note**: deploying to the Edge has [its limitations](https://vercel.com/docs/concepts/functions/edge-functions#known-limitations) — they can't be more than 1 MB in size and they don't support native Node.js APIs, among others.
You can change where to target by changing the import:
```js
import vercel from '@astrojs/vercel/edge';
import vercel from '@astrojs/vercel/serverless';
import vercel from '@astrojs/vercel/static';
```
### Node.js version
When deploying to `serverless` you can choose what version of Node.js you want to target: `12.x`, `14.x` or `16.x` (default).
```js
import { defineConfig } from 'astro/config';
import vercel from '@astrojs/vercel/serverless';
export default defineConfig({
adapter: vercel({ nodeVersion: '14.x' })
});
```
## Limitations
**A few known complex packages (example: [puppeteer](https://github.com/puppeteer/puppeteer)) do not support bundling and therefore will not work properly with this adapter.** By default, Vercel doesn't include npm installed files & packages from your project's `./node_modules` folder. To address this, the `@astrojs/vercel` adapter automatically bundles your final build output using `esbuild`.