.stylelintrc.mjs

// These are all the custom `@` (at) rules that we use within our custom PostCSS plugins
const CUSTOM_AT_RULES = [
  // Tailwind-specific at-rules
  'apply',
  'layer',
  'responsive',
  'screen',
  'tailwind',
  'variants',
  // PostCSS-specific at-rules
  'define-mixin',
  'mixin',
];

// Enforces certain selectors to be only in camelCase notation
// We use these for id selectors and classname selectors
const ONLY_ALLOW_CAMEL_CASE_SELECTORS = [
  /^(?:[a-z]+(?:[A-Z][a-z]*)*)$/,
  { message: s => `Expected '${s}' to be in camelCase` },
];

export default {
  extends: ['stylelint-config-standard'],
  plugins: ['stylelint-order', 'stylelint-selector-bem-pattern'],
  rules: {
    // Enforces Element Class Names to be camelCase
    'selector-class-pattern': ONLY_ALLOW_CAMEL_CASE_SELECTORS,
    // Enforces Element IDs to be camelCase
    'selector-id-pattern': ONLY_ALLOW_CAMEL_CASE_SELECTORS,
    'at-rule-no-unknown': [true, { ignoreAtRules: CUSTOM_AT_RULES }],
    // Enforces the order of the CSS properties to be in alphabetical order
    'order/properties-alphabetical-order': true,
    'no-descending-specificity': null,
    // Disables the Level-4 Media Queries; Since they're more exotic and less known
    'media-feature-range-notation': 'prefix',
    // Adopts the import notation from `postcss-import`
    'import-notation': 'string',
  },
};