Bookmarklet to remove dark mode styles from a web page

bookmarklet.md

Copy the following URL to a bookmark and give it a cheeky name like "Let there be light":

javascript:(()=>{let e=(e,s)=>{let l=0;for(let o=0;o<s.length&&!(++l>1e4);o++)t(e,o,s[o])},t=(t,s,l)=>{"conditionText"in l&&(/prefers-color-scheme:\s*dark/.test(l.conditionText)?t.deleteRule(s):e(l,l.cssRules))};for(let t of document.styleSheets)try{e(t,t.cssRules)}catch(e){}})();

reduced.js

let handleRules = (owner, rules) => {
  for (let i = 0; i < rules.length; i++) {
    handleRule(owner, i, rules[i]);
  }
}

let handleRule = (owner, idx, rule) => {
  if ('conditionText' in rule) {
    if (/prefers-color-scheme:\s*dark/.test(rule.conditionText)) {
      owner.deleteRule(idx);
    } else {
      handleRules(rule, rule.cssRules);
    }
  }
}

for (let ss of document.styleSheets) {
  try {
    handleRules(ss, ss.cssRules);
  } catch (err) {
  }
}

uncompressed.js

function handleRules(owner, rules) {
  let iter = 0;
  for (let i = 0; i < rules.length; i++) {
    iter++;
    if (iter > 1000) {
      console.log('oops, stopping');
      break;
    }
    handleRule(owner, i, rules[i]);
  }
}

function handleRule(owner, idx, rule) {
  if (rule instanceof CSSMediaRule) {
    if (/prefers-color-scheme:\s*dark/.test(rule.conditionText)) {
      console.log('deleting', idx, rule.conditionText);
      owner.deleteRule(idx);
    } else {
      console.log('recursing', idx, rule.conditionText);
      handleRules(rule, rule.cssRules);
    }
  }
}

function handleStyleSheets(doc) {
  for (let ss of document.styleSheets) {
    try {
      handleRules(ss, ss.cssRules);
    } catch (err) {
      console.log(`couldn't get rules from ${ss.href}`);
    }
  }
}

handleStyleSheets(document.styleSheets);