Responsive Variant Styles Based on Props – Feasibility with stylex.create?

[JuanFuentes20]

Hi StyleX team,

Thank you for your excellent work on StyleX.

I’m currently exploring a feature pattern and would like to know if StyleX currently supports (or plans to support) this use case:

Desired Feature
We’d like to create components that accept a variant prop with either:

1. A string (e.g. "warning", "success", "info"), or
2. An object for responsive behavior (e.g. {default: "warning", desktopAndUp: "info"})

The corresponding styles are defined using stylex.create like so:

const componentStyles = stylex.create({
  warning: { ... },
  success: { ... },
  info: { ... }
});

Goal
We want the component to apply different variant styles responsively, based on the values provided in the variant object.

Attempted Solution
We attempted to use a dynamic function inside stylex.create like this:

dynamicVariant: (
  mobileVariant,
  tabletVariant,
  desktopVariant,
  wideVariant
) => ({
  [MOBILE]: { ...componentStyles[mobileVariant] },
  [TABLET]: { ...componentStyles[tabletVariant] },
  [DESKTOP]: { ...componentStyles[desktopVariant] },
  [WIDE]: { ...componentStyles[wideVariant] },
})

However, we ran into the limitation that spreading (or referencing styles dynamically from the StyleX object) is not allowed within stylex.create, due to the static analysis and compile-time requirements.

Workaround Tried
We tried manually assigning each style key like this:

[DESKTOP]: {
  backdropFilter: componentStyles[desktopVariant].backdropFilter,
  backgroundColor: componentStyles[desktopVariant].backgroundColor,
  color: componentStyles[desktopVariant].color
}

This worked to an extent but:

1. componentStyles was changed to a JS object
2. It's verbose and not maintainable at scale.
3. Since StyleX v0.12.0, media queries must be nested inside a style key, which makes this pattern incompatible with current requirements.
4. We encountered StyleX linter errors, such as:

• "backgroundColor" value must be one of: none, a string literal, null, initial..."
• These errors likely stem from using computed values instead of static literals, which StyleX requires to be known at compile time.

My Question
Is there any current or planned capability in StyleX to support this pattern of responsive variant styling, where variant values (keys of a style map) can be passed responsively and resolved to full style objects per breakpoint?

This pattern would be very powerful for building highly reusable, theme-aware, and responsive components.

Thanks so much in advance for your time

[nmn]

This pattern is explicitly documented here: https://stylexjs.com/docs/learn/recipes/variants/

Specifically, you can define various styles as you described:

const componentStyles = stylex.create({
  warning: { ... },
  success: { ... },
  info: { ... }
});

And then, your component can accept one of the keys as a prop:

type Props = {variant: keyof typeof componentStyles};
function Component({variant}: Props) {
  return <div {...stylex.props(componentStyles[variant])}> ... </div>;
}

---

That said, this pattern is explicitly forbidden: An object for responsive behavior (e.g. {default: "warning", desktopAndUp: "info"})

You should instead pre-define combinations for various screen-sizes rather than configuring different screen sizes manually. This decision was made specifically to improve the reliability of styles and ensure you don't accidentally mix nonsense combinations for mobile vs desktop styles.