Getting started

Prerequisites

Node 22 LTS or higher (see .nvmrc)
A Node package manager: pnpm (recommended), npm, or yarn. Cosmo ships a separate template variant per package manager — pick the one matching your tool below.

pnpm create astro@latest -- --template DyslecixDev/cosmo/template-pnpm my-site
cd my-site
pnpm install

npm create astro@latest -- --template DyslecixDev/cosmo/template-npm my-site
cd my-site
npm install

yarn create astro --template DyslecixDev/cosmo/template-yarn my-site
cd my-site
yarn install

The template ships scripts that work the same with any package manager. With pnpm:

pnpm dev — local dev server with hot module replacement
pnpm build — astro check + astro build
pnpm typecheck — type-check only (also runs on pre-push via Lefthook)
pnpm check — Biome lint + format (also runs on staged files on pre-commit via Lefthook)
pnpm check:fix — Biome with autofix

Substitute npm run <script> or yarn <script> if you’re not on pnpm.