these-can-use-this.js

const caniuse = require('caniuse-api');

const featureSupport = {};
const features = [
  'classlist',
  'element-closest',
  'es6-module',
  'es6-class',
  'fetch',
  'promises',
  'requestanimationframe',
  'srcset',
  'urlsearchparams',
];

const matches = {};
for (const feature of features) {
  let support = caniuse.getSupport(feature);
  featureSupport[feature] = {};
  for (const browser of Object.keys(support)) {
    if (support[browser].y) {
      featureSupport[feature][browser] = support[browser].y;
      matches[browser] = !!matches[browser] ? (matches[browser] + 1) : 1;
    }
  }
}

const matchesRequired = Object.keys(featureSupport).length;
const supportsAll = Object.keys(matches).map(browser => {
  if (matches[browser] === matchesRequired) {
    return browser;
  } else {
    return null;
  }
}).filter(val => {
  return !!val;
});

console.info(supportsAll);

const browserslist = {};
for (const featName of Object.keys(featureSupport)) {
  let feat = featureSupport[featName];
  for (const browser of supportsAll) {
    browserslist[browser] = feat[browser] > browserslist[browser] ? feat[browser] : browserslist[browser] || 0;
  }
}


console.info(browserslist);