css.defineConsts

How to define constants for use in styles and themes.

warning

Constants must be defined as named exports in files with a *.stylex.js (or *.stylex.ts) extension. This limitation is currently imposed due to constraints on how styles are compiled on web.

Overview

This API creates style variables that can be imported and used within css.create() and css.createTheme() calls anywhere within a codebase. These values are inlined at build time and do not generate variables.

constants.stylex.js

import { css } from 'react-strict-dom';

export const breakpoints = css.defineConsts({
  small: '@media (max-width: 600px)',
  medium: '@media (min-width: 601px) and (max-width: 1024px)',
  large: '@media (min-width: 1025px)',
});

API

Named variables

The defineConsts function accepts an object of named constants. These constants can be referenced elsewhere by their key name.

component.js

import { breakpoints } from './constants.stylex.js';

const styles = css.create({
  box: {
    padding: {
      default: '10px',,
      [breakpoints.medium]: '15px',
      [breakpoints.large]: '20px',
    },
  },
});