Specification for spectrum-config.js files

The following is an annotated example that serves to document the format of the spectrum-config.js file. A higher-level explanation may be found here.

Annotated Sample #

module.exports = {
// This is the name that the component has in spectrum-css. If you look
// in node_modules/@adobe/spectrum-css/dist/components, what is the name
// of the directory that contains the CSS for the component that you are
// implementing
spectrum: 'button',
// A list of the components that we would like to generate CSS for. We can
// generate CSS for multiple related components (e.g button and action button)
components: [
// The basename for this component. This will control the naming of the
// generated CSS file
name: 'button',
// Information about the main CSS class for this component. This is the
// name of the CSS class in the spectrum-css file that relates to this
// component (e.g. .spectrum-Button). You can optionally provide a
// shadowSelector which will allow you to map the rules to an element
// in your shadow DOM. The default selector for the CSS rules is :host.
// If you are mapping to the default host: selector then you can
// simply say "host: '.spectrum-Button'"
host: {
// The selector from spectrum-css for the root of the component
selector: '.spectrum-Button',
// The selector in the shadow DOM to map to (defaults to :host)
shadowSelector: '#button',
// For components that can receive focus, this is the element in the
// shadow DOM that should receive focus
focus: '#button',
// These are the options for the component that are set using attributes
// on the web component (e.g. quiet in <sp-button quiet>Click me</sp-button>)
attributes: [
// Attributes may have a boolean type. In that case, if the attribute
// is present, the option is true
// Type of the attribute
type: 'boolean',
// The selector whos rules should come into effect when the
// option is true
selector: '.spectrum-Button--quiet',
type: 'boolean',
// An example of mapping a pseudo attribute to an attribute
// on the web component
selector: ':disabled',
// Attributes may also be of type enum. In that case, there is
// usually a list of CSS classes in spectrum-css, of which only
// one should be present at a time.
type: 'enum',
// For enums, we need to provide a name here for the attribute
// as it is defined in the implementation of the component
name: 'variant',
// This is a list of possible values for the attribute. If
// the option is of the form ".spectrum-Button--cta" where
// ".spectrum-Button" is the root CSS class, then we can extract
// the enum value name automatically
values: [
// This related the enum value <sp-button variant="cta">
// If for some reason, we need to override the enum
// values name, we can provide an object with the
// selector and name explicitly
name: 'negative',
selector: '.spectrum-Button--warning',
// This is a list of all of the spectrum-css class names that we
// wish to map to ids in the shadow DOM.
ids: [
// If the class name follows the patter of starting with the
// root class, then we can extract the id automatically. In this
// case it would be #label
// We can also explicitly provide the selector and the name
selector: '.spectrum-Button-label',
name: 'label'
// We can provide a list of classes that we wish to map. It is
// preferred to use ids when possible. There are some cases
// where it is necessary to use a set CSS rules on multiple
// components in the shadow DOM. In that case, you should map
// the spectrum-css class to a shorter name
classes: [
// Classname in the original spectrum-css
selector: '.spectrum-Slider-track',
// New name to use. This will create the class .track
name: 'track',
// A list of slots on our web component that we wish to apply
// spectrum-css rules to
slots: [
// The name of the slot (e.g. <slot name="icon">)
name: 'icon',
// The spectrum-css selector who's rules we wish to apply
selector: '.spectrum-Icon',
// Regular expressions for rules that we wish to exclude from our
// processing. There are rules that do not make sense in a web
// component, and it is good form to keep our CSS as small as
// possible
exclude: [/\.is-disabled/],
// A second component specification in the same file
name: 'action-button',
host: {
selector: '.spectrum-ActionButton',
shadowSelector: '#button',