memoized-custom-properties-check

memoized-custom-properties-check.js

/* Didn't notice any perf improvement with memozing this, actually saw a regression
memoized custom property check, may see improvement if called more frequently */
const customPropertyCheck = () => {
  let cache = {};
  console.log(cache);
  return () => {
    if ('customProperties' in cache) {
      console.log('Fetching from cache');
      return cache['customProperties'];
    }
    else {
      console.log('Calculating result');
      let result = window.CSS && CSS.supports("color", "var(--color)");
      cache['customProperties'] = result;
      return result;
    }
  }
}
const cp = customPropertyCheck();