---
title: "Packages you can use"
description: "The npm packages a site can build with on Atelier201, and how to add one."
canonical: "https://atelier201.com/docs/platform/packages"
updated: "2026-11-06"
---

# Packages you can use

A site builds without network access, on packages installed in advance. Any of
them can be added to a site; a package that is not on the list, or a version
Atelier201 does not have, makes the build fail with `dependencies_unavailable` and
names the package.

| For                          | Packages                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| ---------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Astro                        | `astro` 7.4.2, `@astrojs/mdx` 8.1.2, `@astrojs/rss` 4.0.19, `@astrojs/sitemap` 3.7.4                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Styling                      | `tailwindcss` 4.3.3, `@tailwindcss/vite` 4.3.3, `@tailwindcss/typography` 0.5.20, `tw-animate-css` 1.4.0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Interactive components       | `@astrojs/react` 7.1.2, `react` 19.3.1, `react-dom` 19.3.1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| shadcn components            | `@base-ui/react` 1.9.0, `class-variance-authority` 0.7.1, `clsx` 2.1.1, `tailwind-merge` 3.7.0, `cmdk` 1.1.1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| Icons                        | `@lucide/astro` 1.65.0, `lucide-react` 1.65.0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| Markdown and HTML processing | `marked` 18.1.2, `hast-util-from-html` 2.0.3, `hast-util-to-mdast` 10.1.2, `hast-util-to-string` 3.0.1, `mdast-util-gfm` 3.1.0, `mdast-util-to-markdown` 2.2.1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| Fonts (self-hosted, OFL)     | `@fontsource-variable/albert-sans` 5.3.0, `@fontsource-variable/archivo` 5.3.0, `@fontsource-variable/big-shoulders` 5.3.0, `@fontsource-variable/bodoni-moda` 5.3.0, `@fontsource-variable/bricolage-grotesque` 5.3.0, `@fontsource-variable/cormorant-garamond` 5.3.0, `@fontsource-variable/dm-sans` 5.3.0, `@fontsource-variable/eb-garamond` 5.3.0, `@fontsource-variable/fraunces` 5.3.0, `@fontsource-variable/geist` 5.3.0, `@fontsource-variable/geist-mono` 5.3.0, `@fontsource-variable/hanken-grotesk` 5.3.0, `@fontsource-variable/ibm-plex-sans` 5.3.0, `@fontsource-variable/instrument-sans` 5.3.0, `@fontsource-variable/inter` 5.3.0, `@fontsource-variable/inter-tight` 5.3.0, `@fontsource-variable/jost` 5.3.0, `@fontsource-variable/literata` 5.3.0, `@fontsource-variable/manrope` 5.3.0, `@fontsource-variable/newsreader` 5.3.0, `@fontsource-variable/onest` 5.3.1, `@fontsource-variable/schibsted-grotesk` 5.3.0, `@fontsource-variable/space-grotesk` 5.3.0, `@fontsource-variable/unbounded` 5.3.0, `@fontsource-variable/work-sans` 5.3.0, `@fontsource/anton` 5.3.0, `@fontsource/dm-mono` 5.3.0, `@fontsource/dm-serif-display` 5.3.0, `@fontsource/ibm-plex-mono` 5.3.0, `@fontsource/instrument-serif` 5.3.0, `@fontsource/young-serif` 5.3.0, `@fontsource/zilla-slab` 5.3.0 |

Packages these depend on, such as `sharp` for images, are available too, at the
version these install.

## Adding one

Declare the package in `dependencies` in the site's `package.json`, with a
range that accepts Atelier201's version (`"react": "^19.3.0"` works for 19.3.1).
The build checks every declared package against the list and uses the
preinstalled copies, so no install runs and the lockfile is not read. A
`devDependencies` entry Atelier201 does not have, such as `typescript` or
`@types/react`, is left out of the build.

The assistant and connected agents know this list: ask for Tailwind, a React
component or shadcn components and they set them up.

## Moving an existing site

An Astro site that already uses these packages builds as it is once its ranges
accept the versions above. Before importing one:

- keep `output: "static"` and no adapter;
- move type and check tools (`typescript`, `@types/*`, `@astrojs/check`) to
  `devDependencies`;
- remove analytics packages such as `posthog-js`: analytics and other tags go
  in the site's integrations, in its settings.

A package Atelier201 does not have yet can be requested from support.