just-the-docs/node_modules/stylelint/lib/utils/isStandardSyntaxMediaFeatureName.js

/* @flow */
"use strict"

/**
 * Check whether a media feature name is standard
 */
module.exports = function (mediaFeatureName/*: string*/)/*: boolean*/ {
  // SCSS interpolation
  if (/#{.+?}|\$.+?/.test(mediaFeatureName)) {
    return false
  }

  return true
}