Extremely simple CSS specificity analyzer

index.js

const css         = require('css'),
      fs          = require('fs'),
      specificity = require('specificity');

function getSelectorsWithHighSpecificity(cssFilePath, maxSpecificity) {
    const cssFile = fs.readFileSync(cssFilePath, 'utf8'),
          output = [];

    css.parse(cssFile).stylesheet.rules.forEach(rule => {
        if (rule.type === 'rule') {
            rule.selectors.forEach(el => {
                output.push(specificity.calculate(el)[0]);
            })
        }
    });

    return output
        .map(rule => ({
            selector: rule.selector,
            specificity: rule.specificityArray[1] * 100 + rule.specificityArray[2] * 10 + rule.specificityArray[3] * 1
        }))
        .sort((a, b) => a.specificity - b.specificity)
        .filter(el => el.specificity > maxSpecificity);
}

const output = getSelectorsWithHighSpecificity(
    '/Users/igloczek/Sites/magento2/pub/static/frontend/Snowdog/blank/en_US/css/styles.css',
    70
);

console.log('Selectors found: ' + output.length);

output.forEach(el => {
    console.log(el.specificity + ' - ' + el.selector);
});

package.json

{
  "dependencies": {
    "css": "^2.2.1",
    "specificity": "^0.3.0"
  }
}