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6.1.1 • Public • Published


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@stylable/runtime provides the utility that is used to create the stylesheet functions that apply classNames and states to the DOM. It also exposes an optional DOM renderer that is responsible for loading CSS in its correct order.

End-users will usually not add this package directly as a dependency themselves, and would instead receive it as a dependency of their chosen integration (e.g. @stylable/webpack-plugin).


@stylable/runtime exposes two methods, Stylesheet and Renderer.


When importing a Stylable stylesheet, there are multiple named exports that are exposed for usage.

import { 
} from './local.st.css';
Import name Description
style utility function that returns a string to be used as a node class name for classes and states passed to it
classes an object mapping exported classes from their source name to their scoped name
vars an object mapping exported css custom properties (vars) from their source name to their scoped name
stVars an object mapping build time Stylable variables to their build time values (these cannot be overridden in runtime)
keyframes an object mapping exported keyframes from their source name to their scoped name
layers an object mapping exported layers from their source name to their scoped name
containers an object mapping exported containers from their source name to their scoped name
cssStates utility function that maps an object representing states and their values to a string with all required classes

Style utility function

The style function is useful for creating the root node of you component, passing along classes passed through props, or whenever a state is being defined.

    contextClassName: string, stateOrClass: string | StateMap, ...classes: string[]
Argument Type Description Required
contextClassName string className to be namespaced true
stateOrClass StateMap | string either an object containing states and their values, or a class string false
classes string any other argument passed will represent a classes that should be applied. In any root node of a component, props.className should be passed along to maintain external customization false
import { style, classes } from './local.st.css';

// properties passed to the component externally
props = { className: "app__root app--propstate" };

// The classes export exposes a map of classNames and their namespaced values.
// returns "local__root"

<div className={style(classes.root)} />
// becomes <div className="local__root" /> 

<div className={style(classes.root, { localState: true })} />
// becomes <div className="local__root local--localstate" /> 

<div className={style(classes.root, { localState: true }, props.className)} />
// becomes <div className="local__root local--localstate app__root app--propstate" /> 

<div className={style(classes.root, 'global-class', props.className)} />
// becomes <div className="local__root global-class app__root app--propstate" /> 

<div className={classes.part} />
// becomes <div className="local__part" /> 


Responsible for managing CSS files, linking to the document and maintaining their correct order in your application.

TypeScript integration

When importing a Stylable stylesheet in TypeScript, a global module declaration needs to be defined in order to not receive type errors about unknown imports.

Add the following file to your /src directory.

// globals.d.ts
declare module '*.st.css' {
    export * from '@stylable/runtime/stylesheet';

    const defaultExport: unknown;
    export default defaultExport;


Copyright (c) 2017 Wix.com Ltd. All Rights Reserved. Use of this source code is governed by a MIT license.




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