digitransit-ui/app/util/get-selector.js

/* eslint-disable no-restricted-syntax, no-continue */

export default function getSelector(mode) {
  const selector = mode.toLowerCase();
  for (const index in document.styleSheets) {
    // Use hasOwnProperty from the {} to make sure styleSheets hasn't overridden it
    if ({}.hasOwnProperty.call(document.styleSheets, index)) {
      try {
        for (const index2 in document.styleSheets[index].cssRules) {
          if (
            {}.hasOwnProperty.call(document.styleSheets[index].cssRules, index2)
          ) {
            const ref =
              document.styleSheets[index].cssRules[index2].selectorText;
            // A bug in minifier messes the selectors in production mode...
            if (
              ref &&
              ref
                .split(',')
                .map(s => s.trim())
                .indexOf(selector) > -1
            ) {
              return document.styleSheets[index].cssRules[index2];
            }
          }
        }
      } catch (err) {
        continue;
      }
    }
  }
  return false;
}