astro/docs/guides/publish-to-npm.md

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~/layouts/Main.astro	Publish Components to NPM

Built a great Astro component? Publish it to npm!

Once published to npm, Astro components can be installed and used in your project like any other npm package. npm is a great way to share Astro components across projects within your team, your company, or the entire world.

Basic NPM Package Setup

Here's an example package that we'd like to publish to npm. It includes two Astro components and a few other files.

/my-components-package/
├── package.json
├── index.js
├── Capitalize.astro
└── Bold.astro

package.json

Your package manifest. This includes information about your package such as name, description, any dependencies, and other important metadata. If you don't know what the package.json file is, we highly recommend you to have a quick read on the npm documentation.

We recommend that you define an exports entry for your index.js package entrypoint like so:

{
  "name": "@example/my-components",
  "version": "0.0.1",
  "exports": "./index.js"
}

index.js

index.js is your package entrypoint, which is the file that gets loaded when someone imports your package by name. Having a JavaScript file as your package entrypoint will let you export multiple components and have better control over their exported component names.

export { default as Capitalize } from './Capitalize.astro';
export { default as Bold } from './Bold.astro';

Publishing

Once you have your package ready, you can publish it to npm by running the command npm publish. If that fails, make sure that you've logged in via npm login and that your package.json is correct.

Once published, anyone will be able to install your components and then import them like so:

---
import { Bold, Capitalize } from '@example/my-components';
---
<Capitalize phrase={`Hello world`} />

Advanced

We recommend a single index.js package entrypoint because this is what most users are familar with. However, in some rare scenarios you may want to have your users import each .astro component directly, in the same manner that you import .astro files in your own project.

---
import Capitalize from '@example/my-components/Capitalize.astro';
---
<Capitalize phrase={`Hello world`} />

This is a less common scenario, and we only recommend it if you have good reason. Because Astro is completely rendered at build-time, there are no client-side performance concerns to our default recommendation to export your components from a single index.js file.

To support importing by file within your package, add each file to your package.json exports map:

{
  "name": "@example/my-components",
  "version": "1.0.0",
  "exports": {
-    ".": "./index.js",
+    "./Bold.astro": "./Bold.astro",
+    "./Capitalize.astro": "./Capitalize.astro"
  }
}