Public API

Every csszyx package pins the others to its own version, so an entry one csszyx package imports from another changes with them. This page names the entries you may import, the entries the compiler writes imports to, and the entries that connect the packages. A change to a public entry follows semver; a change to an internal one ships in the same release as every package that reads it.

Kind	Meaning
public	Import it, or name it in a config file. Changes follow semver.
generated	The compiler writes imports to it. Keep the version the build installed; do not import it yourself. Its exports change only by adding names.
internal	Connects csszyx packages. Not for import; it can change in any release.

Entries

Entry	Kind	What it is
csszyx	public	The umbrella package: the runtime helpers, transform, transformSource and serializeManifest. The @csszyx/core functions it re-exports (encode, transform_sz, compute_mangle_checksum, verify_mangle_checksum) are internal.
csszyx/lite	public	The string-only runtime helpers.
csszyx/vite	public	The Vite plugin.
csszyx/webpack	public	The webpack plugin.
csszyx/dynamic	public	Runtime injection.
csszyx/dynamic/react	public	Runtime injection for React.
csszyx/browser	public	The CDN build.
csszyx/browser.dev	public	The CDN build with development warnings.
csszyx/core	generated	The concat helpers the compiler retargets imports to.
csszyx/lowering	public	The import that loads the object lowering outside the plugin.
@csszyx/runtime	public	The runtime helpers.
@csszyx/runtime/lite	public	The string-only runtime helpers.
@csszyx/runtime/lowering	public	The import that loads the object lowering outside the plugin.
@csszyx/runtime/split	public	The className half of the class toolkit.
@csszyx/runtime/core	generated	The concat helpers the compiler retargets imports to.
@csszyx/runtime/merge	generated	The group-merge helpers the compiler injects.
@csszyx/dynamic	public	Runtime injection.
@csszyx/dynamic/react	public	Runtime injection for React.
@csszyx/vars	public	CSS custom property helpers.
@csszyx/vars/react	public	CSS custom property helpers for React.
@csszyx/types	public	The sz prop and config types.
@csszyx/types/config	public	The config types.
@csszyx/types/runtime	public	The runtime types.
@csszyx/types/compiler	public	The compiler types.
@csszyx/types/jsx	public	The JSX sz prop augmentation.
@csszyx/types/jsx-react	public	The JSX sz prop augmentation for React.
@csszyx/types/jsx-solid	public	The JSX sz prop augmentation for Solid.
@csszyx/unplugin	public	The bundler plugin and its factories.
@csszyx/unplugin/vite	public	The Vite plugin.
@csszyx/unplugin/webpack	public	The webpack plugin.
@csszyx/unplugin/next	public	The Next.js wrapper.
@csszyx/unplugin/postcss	public	The PostCSS plugin.
@csszyx/unplugin/jest	public	The Jest transformer.
@csszyx/unplugin/css-mangler	public	The CSS class mangler.
@csszyx/unplugin/next-prebuild	public	The Next.js prebuild pass.
@csszyx/unplugin/next-watcher	internal	The watcher csszyx next watch runs.
@csszyx/unplugin/next-turbo-loader	internal	The Turbopack loader csszyxTurbopack registers.
@csszyx/unplugin/diagnostics	internal	The diagnostic policy the CLI and the plugin share.
@csszyx/compiler	public	The sz lowering and the recovery manifest.
@csszyx/compiler/engine	public	The engine calls: transformSource and the scans.
@csszyx/compiler/browser	public	The browser-safe lowering.
@csszyx/compiler/migrate	internal	The migrate engine calls @csszyx/cli makes; use migrateSource or classNameToSzObject from @csszyx/cli.
@csszyx/compiler/internal	internal	The build lanes’ calls; use @csszyx/compiler/engine.
@csszyx/compiler/report	internal	The diagnostic words every package renders with.
@csszyx/compiler/errors	internal	The error class every package throws; use isCsszyxError from @csszyx/runtime.
@csszyx/compiler/sz-limits	internal	The depth limits the runtime shares.
@csszyx/compiler/keyword-families	internal	The keyword tables the runtime shares.
@csszyx/compiler/bool-class	internal	A helper the runtime re-exports.
@csszyx/compiler/color-var	internal	A helper the runtime re-exports.
@csszyx/compiler/spacing-var	internal	A helper the runtime re-exports.
@csszyx/core	internal	The engine. Install it beside the compiler; do not import it. Use @csszyx/compiler/engine.
@csszyx/core/native	internal	The engine’s native binding.
@csszyx/core/parser-wasm	internal	The engine’s WebAssembly build.
@csszyx/cli	public	The csszyx command, classNameToSzObject and migrateSource.
@csszyx/mcp-server	public	The csszyx-mcp command.
@csszyx/ts-plugin	public	The TypeScript plugin, named in tsconfig.json.
@csszyx/svelte-adapter	public	The Svelte preprocessor.
@csszyx/vue-adapter	public	The Vue preprocessor.

A name an entry exports with a leading _ or __, or one marked @internal in its types, is written by the compiler or used by csszyx’s own packages, and follows the entry’s kind above only for code the compiler wrote.