From 1b2abf0be9d2faa8a5cdbbc37847c4eb272b9545 Mon Sep 17 00:00:00 2001
From: Chess Luo <chess@luo.sh>
Date: Sat, 2 Apr 2022 20:12:09 +0800
Subject: [PATCH 1/7] modularization and more organized project structure

---
 README.md                   |   11 +-
 demo/test.html              |    2 +-
 scoped.js => dist/scoped.js |   85 +-
 dist/scoped.min.js          |    1 +
 lib/index.js                |  518 ++++++++
 lib/polyfill.js             |  538 +++++++++
 package-lock.json           | 2215 ++++++++++++++++++++++++++++++++---
 package.json                |   24 +-
 rollup.umd.config.js        |   23 +
 scoped.min.js               |    9 -
 src/index.js                |  517 ++++++++
 src/polyfill.js             |   29 +
 src/regex.js                |    6 +
 test.js                     |    2 +-
 14 files changed, 3756 insertions(+), 224 deletions(-)
 rename scoped.js => dist/scoped.js (94%)
 create mode 100644 dist/scoped.min.js
 create mode 100644 lib/index.js
 create mode 100644 lib/polyfill.js
 create mode 100644 rollup.umd.config.js
 delete mode 100644 scoped.min.js
 create mode 100644 src/index.js
 create mode 100644 src/polyfill.js
 create mode 100644 src/regex.js

diff --git a/README.md b/README.md
index f128228..99352c2 100644
--- a/README.md
+++ b/README.md
@@ -75,13 +75,4 @@ If this is _actually something you need_, I will eat my hat. 🎩
 
 # Release
 
-Compile code with [Closure Compiler](https://closure-compiler.appspot.com/home).
-
-```
-// ==ClosureCompiler==
-// @compilation_level ADVANCED_OPTIMIZATIONS
-// @output_file_name scoped.min.js
-// ==/ClosureCompiler==
-
-// code here
-```
+Compile code with `npm run build`.
\ No newline at end of file
diff --git a/demo/test.html b/demo/test.html
index 69c8cd0..48fbb37 100644
--- a/demo/test.html
+++ b/demo/test.html
@@ -122,6 +122,6 @@ <h3>The following should not be colored (not scoped)</h3>
   });
 </script>
 
-<script src="../scoped.min.js"></script>
+<script src="../dist/scoped.js"></script>
 </body>
 </html>
diff --git a/scoped.js b/dist/scoped.js
similarity index 94%
rename from scoped.js
rename to dist/scoped.js
index d01ad68..ba9434e 100644
--- a/scoped.js
+++ b/dist/scoped.js
@@ -1,35 +1,16 @@
-/*
- * Copyright 2017 Google Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License"); you may not
- * use this file except in compliance with the License. You may obtain a copy of
- * the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
- * License for the specific language governing permissions and limitations under
- * the License.
- */
-
-/**
- * @fileoverview Polyfill for `<style scoped>`.
- */
-
-
-(function() {
-  const s = document.createElement('style');
-  if ('scoped' in s) {
-    return;  // do nothing
-  }
+(function (factory) {
+  typeof define === 'function' && define.amd ? define(factory) :
+  factory();
+}((function () { 'use strict';
 
-  const scopedCSSOptions = {
-    'applyToClass': false,
-    'prefix': '__scoped_',
-  };
+  // This monstrosity matches any valid `[foo="bar"]` block, with either quote style. Parenthesis
+  // have no special meaning within an attribute selector, and the complex regexp below mostly
+  // exists to allow \" or \' in string parts (e.g. `[foo="b\"ar"]`).
+  const attrRe = /^\[.*?(?:(["'])(?:.|\\\1)*\1.*)*\]/;
+  const walkSelectorRe = /([([,]|:scope\b)/;  // "interesting" setups
+  const scopeRe = /^:scope\b/;
 
+  const s = document.createElement('style');
   // are we in old IE/Firefox mode, where .selectorText can't be changed inline?
   s.textContent = '.x{color:red;}';
   document.head.appendChild(s);
@@ -37,6 +18,10 @@
   const writeMode = s.sheet.cssRules[0].selectorText === '.change';
   document.head.removeChild(s);
 
+  const scopedCSSOptions = {
+    'applyToClass': false,
+    'prefix': '__scoped_',
+  };
 
   Object.defineProperty(HTMLStyleElement.prototype, 'scoped', {
     enumerable: true,
@@ -57,24 +42,6 @@
    */
   const styleNodes = new Map();
 
-
-  function hashCode(s) {
-    let hash = 5381;
-    let j = s.length;
-    while (j) {
-      hash = (hash * 33) ^ s.charCodeAt(--j);
-    }
-    return hash;
-  }
-
-
-  // This monstrosity matches any valid `[foo="bar"]` block, with either quote style. Parenthesis
-  // have no special meaning within an attribute selector, and the complex regexp below mostly
-  // exists to allow \" or \' in string parts (e.g. `[foo="b\"ar"]`).
-  const attrRe = /^\[.*?(?:(["'])(?:.|\\\1)*\1.*)*\]/;
-  const walkSelectorRe = /([([,]|:scope\b)/;  // "interesting" setups
-  const scopeRe = /^:scope\b/;
-
   /**
    * Consumes a single selector from candidate selector text, which may contain many.
    *
@@ -481,7 +448,7 @@
     // const hash = hashCode(node.textContent);
 
     // newly found style node, setup attr
-    const attrName = `${scopedCSSOptions['prefix']}${++uniqueId}`
+    const attrName = `${scopedCSSOptions['prefix']}${++uniqueId}`;
     const prefix = applyMode === applyToAttr ? `[${attrName}]` : `.${attrName}`;
     styleNodes.set(node, {attrName, prefix, parent: node.parentNode});
 
@@ -549,10 +516,28 @@
     }
   }
 
+  /*
+   * Copyright 2017 Google Inc. All rights reserved.
+   *
+   * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+   * use this file except in compliance with the License. You may obtain a copy of
+   * the License at
+   *
+   *     http://www.apache.org/licenses/LICENSE-2.0
+   *
+   * Unless required by applicable law or agreed to in writing, software
+   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+   * License for the specific language governing permissions and limitations under
+   * the License.
+   */
+
+  console.log("scoped");
+
   if (document.readyState === 'loading') {
     window.addEventListener('DOMContentLoaded', setup);
   } else {
     setup();
   }
 
-}());
\ No newline at end of file
+})));
diff --git a/dist/scoped.min.js b/dist/scoped.min.js
new file mode 100644
index 0000000..cbf9bce
--- /dev/null
+++ b/dist/scoped.min.js
@@ -0,0 +1 @@
+!function(e){"function"==typeof define&&define.amd?define(e):e()}(function(){"use strict";const a=/^\[.*?(?:(["'])(?:.|\\\1)*\1.*)*\]/,l=/([([,]|:scope\b)/,u=/^:scope\b/,e=document.createElement("style"),f=(e.textContent=".x{color:red;}",document.head.appendChild(e),(e.sheet.cssRules[0].selectorText=".change")===e.sheet.cssRules[0].selectorText),o=(document.head.removeChild(e),{applyToClass:!1,prefix:"__scoped_"}),c=(Object.defineProperty(HTMLStyleElement.prototype,"scoped",{enumerable:!0,get(){return this.hasAttribute("scoped")},set(e){e?this.setAttribute("scoped",this.getAttribute("scoped")||""):this.removeAttribute("scoped")}}),new Map);function p(e,t){const n=[];for(;e;){var s=function(e,t){let n=e.search(l);if(-1===n)return{selector:t+" "+e,rest:""};if(","===e[n])return{selector:t+" "+e.substr(0,n),rest:e.substr(n+1)};let s=!0,r=!1,o=(n=e.search(/\S/),0);e:for(;n<e.length;++n){var c=e[n];switch(c){case"[":var i=a.exec(e.substr(n));n+=(i?i[0].length:1)-1;continue;case"(":++o;continue;case":":if(!s)continue;if(!u.test(e.substr(n)))continue;if(o)return null;e=e.substring(0,n)+t+e.substr(n+6),n+=t.length,r=!0,--n;continue;case")":o&&--o;continue}if(!o)switch(c){case",":break e;case" ":case">":case"~":case"+":if(!s)continue;s=!1}}return{selector:(r?"":t+" ")+e.substr(0,n),rest:e.substr(n+1)}}(e,t);if(null===s)return":not(*)";n.push(s.selector),e=s.rest}return n.join(", ")}function h(e,t){const n=e.parentStyleSheet;let s;for(s=0;s<n.rules.length&&n.rules[s]!==e;++s);return n.removeRule(s),n.insertRule(t,s),n.rules[s]}function m(e){let t=null;try{t=e.cssRules}catch(e){if(e instanceof DOMException)return e;throw e}return t?null:{code:DOMException.SECURITY_ERR}}const i=function(){const i=new WeakMap,a=new Map,l=new Map,u=function(){let e=0;function t(){let n=!1;e=0,a.forEach((e,t)=>{if(t.styleSheet)d(t.styleSheet,e);else if(function(e){let t=e.parentStyleSheet;for(;t;){if(t.ownerNode)return t.ownerNode;t=t.parentStyleSheet}}(t))return void(n=!0);a.delete(t)}),l.forEach((e,t)=>{m(t)?n=!0:(d(t,e),l.delete(t))}),n&&(e=window.requestAnimationFrame(t))}return function(){e=e||window.requestAnimationFrame(t)}}();function d(t,n){if(i.get(t)!==n){var e=m(t);if(e)switch(e.code){case DOMException.SECURITY_ERR:const o=new XMLHttpRequest,c=(o.responseType="blob",o.open("GET",t.href),h(t.ownerRule,"@import url('data:text/css;base64,')"));return o.onload=()=>{var e=URL.createObjectURL(o.response),t=h(c,`@import '${e}'`);a.set(t,n),u(),URL.revokeObjectURL(e)},void o.send();case DOMException.INVALID_ACCESS_ERR:return l.set(t,n),void u();default:throw e}i.set(t,n);var s=t.cssRules.length;for(let e=0;e<s;++e){var r=t.cssRules[e];r instanceof CSSImportRule?r.styleSheet?d(r.styleSheet,n):(a.set(r,n),u()):function t(n,s,e,r){if(n instanceof CSSMediaRule){var o=n.cssRules.length;for(let e=0;e<o;++e)t(n.cssRules[e],s,n,e)}else{var c,i;n instanceof CSSStyleRule&&(c=p(n.selectorText,s),f?n.selectorText=c:(i=n.style.cssText,e.deleteRule(r),e.insertRule(c+` {${i}}`,r)))}}(r,n,t,e)}return!0}}return d}();function d(e,t,n){n?e.setAttribute(t,""):e.removeAttribute(t)}function s(e,t,n){n?e.classList.add(t):e.classList.remove(t)}let b=d,S=0;function y(e){var t,n,s=e.scoped&&document.body.contains(e)?e.parentNode:null;const r=c.get(e);if(r)return s?e.sheet&&i(e.sheet,r.prefix):(c.delete(e),n=(t=e).textContent,t.textContent="",t.textContent=n),r.parent!==s&&(r.parent&&b(r.parent,r.attrName,!1),s&&b(s,r.attrName,!0),r.parent=s),!1;s&&(t=""+o.prefix+ ++S,n=b===d?`[${t}]`:"."+t,c.set(e,{attrName:t,prefix:n,parent:e.parentNode}),i(e.sheet,n),b(s,t,!0))}const r=new MutationObserver(e=>{const r=new Set,t=e=>{let t=e?e.length:0;for(;t;){const s=e[--t];if(s instanceof HTMLElement)if(s instanceof HTMLStyleElement)r.add(s);else{var n=s.getElementsByTagName("style");let e=n.length;for(;e;)r.add(n[--e])}}};e.forEach(e=>{e.target instanceof HTMLStyleElement?r.add(e.target):(t(e.addedNodes),t(e.removedNodes))}),r.forEach(y)});function t(){var e=window.scopedCSS;if("object"==typeof e){for(var t in o)t in e&&(o[t]=e[t]);o.applyToClass&&(b=s)}r.observe(document,{childList:!0,subtree:!0,attributes:!0,attributeFilter:["scoped"]});var n=document.body.getElementsByTagName("style");for(let e=0;e<n.length;++e)y(n[e])}console.log("scoped"),"loading"===document.readyState?window.addEventListener("DOMContentLoaded",t):t()});
diff --git a/lib/index.js b/lib/index.js
new file mode 100644
index 0000000..0052b0f
--- /dev/null
+++ b/lib/index.js
@@ -0,0 +1,518 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', { value: true });
+
+// This monstrosity matches any valid `[foo="bar"]` block, with either quote style. Parenthesis
+// have no special meaning within an attribute selector, and the complex regexp below mostly
+// exists to allow \" or \' in string parts (e.g. `[foo="b\"ar"]`).
+const attrRe = /^\[.*?(?:(["'])(?:.|\\\1)*\1.*)*\]/;
+const walkSelectorRe = /([([,]|:scope\b)/;  // "interesting" setups
+const scopeRe = /^:scope\b/;
+
+const s = document.createElement('style');
+// are we in old IE/Firefox mode, where .selectorText can't be changed inline?
+s.textContent = '.x{color:red;}';
+document.head.appendChild(s);
+s.sheet.cssRules[0].selectorText = '.change';
+const writeMode = s.sheet.cssRules[0].selectorText === '.change';
+document.head.removeChild(s);
+
+const scopedCSSOptions = {
+  'applyToClass': false,
+  'prefix': '__scoped_',
+};
+
+Object.defineProperty(HTMLStyleElement.prototype, 'scoped', {
+  enumerable: true,
+  get() {
+    return this.hasAttribute('scoped');
+  },
+  set(v) {
+    if (v) {
+      this.setAttribute('scoped', this.getAttribute('scoped') || '');
+    } else {
+      this.removeAttribute('scoped');
+    }
+  },
+});
+
+/**
+ * @type {!Map<!HTMLStyleElement, {attrName: string, prefix: string, parent: !HTMLElement}>}
+ */
+const styleNodes = new Map();
+
+/**
+ * Consumes a single selector from candidate selector text, which may contain many.
+ *
+ * @param {string} raw selector text
+ * @return {?{selector: string, rest: string}}
+ */
+function consumeSelector(raw, prefix) {
+  let i = raw.search(walkSelectorRe);
+  if (i === -1) {
+    // found literally nothing interesting, success
+    return {
+      selector: `${prefix} ${raw}`,
+      rest: '',
+    };
+  } else if (raw[i] === ',') {
+    // found comma without anything interesting, yield rest
+    return {
+      selector: `${prefix} ${raw.substr(0, i)}`,
+      rest: raw.substr(i + 1),
+    }
+  }
+
+  let leftmost = true;   // whether we're past a descendant or similar selector
+  let scope = false;     // whether :scope has been found + replaced
+  i = raw.search(/\S/);  // place i after initial whitespace only
+
+  let depth = 0;
+outer:
+  for (; i < raw.length; ++i) {
+    const char = raw[i];
+    switch (char) {
+      case '[':
+        const match = attrRe.exec(raw.substr(i));
+        i += (match ? match[0].length : 1) - 1;  // we add 1 every loop
+        continue;
+
+      case '(':
+        ++depth;
+        continue;
+
+      case ':':
+        if (!leftmost) {
+          continue;  // doesn't matter if :scope is here, it'll always be ignored
+        } else if (!scopeRe.test(raw.substr(i))) {
+          continue;  // not ':scope', ignore
+        } else if (depth) {
+          return null;
+        }
+
+        // Replace ':scope' with our prefix. This can happen many times; ':scope:scope' is valid.
+        // It will never apply to a descendant selector (e.g., ".foo :scope") as this is ignored
+        // by browsers anyway (invalid).
+        raw = raw.substring(0, i) + prefix + raw.substr(i + 6);
+        i += prefix.length;
+        scope = true;
+        --i;  // we'd skip over next character otherwise
+        continue;  // run loop again
+
+      case ')':
+        if (depth) {
+          --depth;
+        }
+        continue;
+    }
+    if (depth) {
+      continue;
+    }
+
+    switch (char) {
+      case ',':
+        break outer;
+
+      case ' ':
+      case '>':
+      case '~':
+      case '+':
+        if (!leftmost) {
+          continue;
+        }
+        leftmost = false;
+    }
+  }
+
+  const selector = (scope ? '' : `${prefix} `) + raw.substr(0, i);
+  return {selector, rest: raw.substr(i + 1)};
+}
+
+function updateSelectorText(selectorText, prefix) {
+  const found = [];
+
+  while (selectorText) {
+    const consumed = consumeSelector(selectorText, prefix);
+    if (consumed === null) {
+      return ':not(*)';
+    }
+    found.push(consumed.selector);
+    selectorText = consumed.rest;
+  }
+
+  return found.join(', ');
+}
+
+
+/**
+ * Upgrades a specific CSSRule.
+ *
+ * @param {!CSSRule} rule
+ * @param {string} prefix to apply
+ * @param {!CSSMediaRule|!CSSStyleSheet} group
+ * @param {number} index in group
+ */
+function upgradeRule(rule, prefix, group, index) {
+  if (rule instanceof CSSMediaRule) {
+    // upgrade children
+    const l = rule.cssRules.length;
+    for (let j = 0; j < l; ++j) {
+      upgradeRule(rule.cssRules[j], prefix, rule, j);
+    }
+    return;
+  }
+
+  if (!(rule instanceof CSSStyleRule)) {
+    return;  // unknown rule type, ignore
+  }
+
+  const update = updateSelectorText(rule.selectorText, prefix);
+
+  if (writeMode) {
+    // anything but old IE/Firefox
+    rule.selectorText = update;
+  } else {
+    // old browsers which don't allow modification of selectorText
+    const cssText = rule.style.cssText;  // save before we delete
+    group.deleteRule(index);
+    group.insertRule(`${update} {${cssText}}`, index);
+  }
+}
+
+
+/**
+ * @param {!CSSRule} rule
+ * @return {Node} owner of rule
+ */
+function ownerNode(rule) {
+  let sheet = rule.parentStyleSheet;
+  while (sheet) {
+    if (sheet.ownerNode) {
+      return sheet.ownerNode;
+    }
+    sheet = sheet.parentStyleSheet;
+  }
+  return null;
+}
+
+
+/**
+ * Replaces a live rule, returning the new `CSSRule` that it was replaced with.
+ *
+ * @param {!CSSRule} rule
+ * @param {string} update to replace with
+ * @return {!CSSRule}
+ */
+function replaceRule(rule, update) {
+  const parent = rule.parentStyleSheet;
+  let i;
+  for (i = 0; i < parent.rules.length; ++i) {
+    if (parent.rules[i] === rule) {
+      break;
+    }
+  }
+  parent.removeRule(i);
+  parent.insertRule(update, i);
+
+  return parent.rules[i];
+}
+
+
+/**
+ * @param {!CSSStyleSheet} sheet
+ * @return {?{code: number}} the DOMException found while accessing this CSS
+ */
+function sheetRulesError(sheet) {
+  // FIXME: This monstrosity just convinces Closure that `sheet.cssRules` has side-effects.
+  let rules = null;
+  try {
+    rules = sheet.cssRules;
+  } catch (e) {
+    if (e instanceof DOMException) {
+      return e;
+    }
+    throw e;
+  }
+  if (rules) {
+    return null;
+  }
+
+  // Safari no longer throws an error here, just pretend we can't read the data.
+  return {code: DOMException.SECURITY_ERR};
+}
+
+// TODO: upgradeSheet could return a Promise or then-like
+
+/**
+ * @param {!CSSStyleSheet} sheet already loaded CSSStyleSheet
+ * @param {string} prefix to apply
+ * @return {boolean} if applied immediately
+ */
+const upgradeSheet = (function() {
+
+  /** @type {!WeakMap<!StyleSheet, string>} */
+  const upgradedSheets = new WeakMap();
+
+  /** @type {!Map<!CSSImportRule, string>} */
+  const pendingImportRule = new Map();
+
+  /** @type {!Map<!CSSStyleSheet, string>} */
+  const pendingInvalidSheet = new Map();
+
+  /**
+   * Callback inside rAF to monitor for @import-style loading or for parsing CSS script tags.
+   * This is ugly, but only happens on styles that are moved or inserted dynamically (static
+   * styles all fire at once).
+   */
+  const requestCheck = (function() {
+    let rAF = 0;
+
+    function check() {
+      let again = false;
+      rAF = 0;
+
+      pendingImportRule.forEach((prefix, importRule) => {
+        if (importRule.styleSheet) {
+          internalUpgrade(importRule.styleSheet, prefix);
+        } else if (ownerNode(importRule)) {
+          again = true;
+          return;  // still valid, do nothing
+        }
+        pendingImportRule.delete(importRule);
+      });
+
+      pendingInvalidSheet.forEach((prefix, sheet) => {
+        if (sheetRulesError(sheet)) {
+          again = true;
+          return;
+        }
+        internalUpgrade(sheet, prefix);
+        pendingInvalidSheet.delete(sheet);
+      });
+
+      // check again next frame
+      if (again) {
+        rAF = window.requestAnimationFrame(check);
+      }
+    }
+
+    return function() {
+      rAF = rAF || window.requestAnimationFrame(check);
+    };
+  }());
+
+  /**
+   * @param {!CSSStyleSheet} sheet
+   * @param {string} prefix
+   */
+  function internalUpgrade(sheet, prefix) {
+    if (upgradedSheets.get(sheet) === prefix) {
+      return;  // already done
+    }
+
+    const e = sheetRulesError(sheet);
+    if (e) {
+      switch (e.code) {
+        case DOMException.SECURITY_ERR:
+          // Occurs if we try to examine a cross-domain CSS file. Fetch it ourselves and update
+          // the CSS once it is available on a 'local' URL.
+          const x = new XMLHttpRequest();
+          x.responseType = 'blob';
+          x.open('GET', sheet.href);
+
+          // This must also be replaced with a temporary @import, as @import must all appear
+          // first. Use a base64 URL that doesn't actually contain anything.
+          const rule = replaceRule(
+              /** @type {!CSSRule} */ (sheet.ownerRule),
+              `@import url('data:text/css;base64,')`
+          );
+
+          x.onload = () => {
+            const url = URL.createObjectURL(/** @type {!Blob} */ (x.response));
+            const update = /** @type {!CSSImportRule} */ (replaceRule(rule, `@import '${url}'`));
+            pendingImportRule.set(update, prefix);
+            requestCheck();
+
+            // We can revoke this URL immediately as it's seemingly read synchronously.
+            URL.revokeObjectURL(url);
+          };
+          // nb. no onerror handling
+
+          x.send();
+          return;
+
+        case DOMException.INVALID_ACCESS_ERR:
+          // This occurs in Firefox if the CSS is yet to be parsed (for dynamic cases), see:
+          //   https://bugzilla.mozilla.org/show_bug.cgi?id=761236
+          pendingInvalidSheet.set(sheet, prefix);
+          requestCheck();
+          return;
+
+        default:
+          throw e;
+      }
+    }
+
+    // Hooray, the sheet is ready to go!
+    upgradedSheets.set(sheet, prefix);
+
+    const l = sheet.cssRules.length;
+    for (let i = 0; i < l; ++i) {
+      const rule = sheet.cssRules[i];
+
+      if (!(rule instanceof CSSImportRule)) {
+        upgradeRule(rule, prefix, sheet, i);
+        continue;
+      }
+
+      if (rule.styleSheet) {
+        // TODO: recursion is bad
+        internalUpgrade(rule.styleSheet, prefix);
+        continue;
+      }
+
+      // otherwise, add to pending queue
+      pendingImportRule.set(rule, prefix);
+      requestCheck();
+    }
+
+    return true;
+  }
+
+  return internalUpgrade;
+}());
+
+
+/**
+ * @param {!HTMLStyleElement} node to reset
+ */
+function resetCSS(node) {
+  const css = node.textContent;
+  node.textContent = '';
+  node.textContent = css;
+}
+
+
+function applyToAttr(node, attrName, apply) {
+  // default version is to apply to attributes
+  if (apply) {
+    node.setAttribute(attrName, '');
+  } else {
+    node.removeAttribute(attrName);
+  }
+}
+
+function applyToClass(node, attrName, apply) {
+  if (apply) {
+    node.classList.add(attrName);
+  } else {
+    node.classList.remove(attrName);
+  }
+}
+
+
+let applyMode = applyToAttr;
+let uniqueId = 0;
+
+
+function upgrade(node) {
+  const effectiveParent = node['scoped'] && document.body.contains(node) ? node.parentNode : null;
+
+  const state = styleNodes.get(node);
+  if (state) {
+    if (!effectiveParent) {
+      // disappearing, clear state and ask browser to reset CSS
+      styleNodes.delete(node);
+      resetCSS(node);
+    } else if (node.sheet) {
+      // otherwise, upgrade the sheet (succeeds if already done)
+      // nb. node.sheet is null if being removed
+      upgradeSheet(node.sheet, state.prefix);
+    }
+
+    if (state.parent !== effectiveParent) {
+      state.parent && applyMode(state.parent, state.attrName, false);
+      effectiveParent && applyMode(effectiveParent, state.attrName, true);
+      state.parent = effectiveParent;
+    }
+
+    return false;  // already upgraded
+  }
+
+  if (!effectiveParent) {
+    return;  // not scoped CSS, never seen before, ignore
+  }
+
+  // TODO: use hash for deduping
+  // const hash = hashCode(node.textContent);
+
+  // newly found style node, setup attr
+  const attrName = `${scopedCSSOptions['prefix']}${++uniqueId}`;
+  const prefix = applyMode === applyToAttr ? `[${attrName}]` : `.${attrName}`;
+  styleNodes.set(node, {attrName, prefix, parent: node.parentNode});
+
+  upgradeSheet(node.sheet, prefix);
+  applyMode(effectiveParent, attrName, true);
+}
+
+// this mess basically calls resolve() with any <style> nodes that changed/removed/added
+// TODO: is it faster to just call getElementsByTagName('style') and compare to previous
+const mo = new MutationObserver((records) => {
+  const changes = new Set();
+  const iterate = (nodes) => {
+    let i = nodes ? nodes.length : 0;
+    while (i) {
+      const node = nodes[--i];
+      if (!(node instanceof HTMLElement)) {
+        continue;  // text node
+      }
+      if (node instanceof HTMLStyleElement) {
+        changes.add(node);  // directly a <style>
+        continue;
+      }
+      // look for changed children
+      const cand = node.getElementsByTagName('style');
+      let j = cand.length;
+      while (j) {
+        changes.add(cand[--j]);
+      }
+    }
+  };
+
+  records.forEach((record) => {
+    if (record.target instanceof HTMLStyleElement) {
+      changes.add(record.target);
+    } else {
+      iterate(record.addedNodes);
+      iterate(record.removedNodes);
+    }
+  });
+
+  changes.forEach(upgrade);
+});
+
+function setup() {
+  // clone any options from global
+  const cand = window['scopedCSS'];
+  if (typeof cand === 'object') {
+    for (let k in scopedCSSOptions) {
+      if (k in cand) {
+        scopedCSSOptions[k] = cand[k];
+      }
+    }
+
+    if (scopedCSSOptions['applyToClass']) {
+      applyMode = applyToClass;
+    }
+  }
+
+  // nb. watch for attributeFilter: ['scoped'] to detect a CSS rule changing at runtime
+  const options = {childList: true, subtree: true, attributes: true, attributeFilter: ['scoped']};
+  mo.observe(document, options);
+  const collection = document.body.getElementsByTagName('style');
+  for (let i = 0; i < collection.length; ++i) {
+    upgrade(collection[i]);
+  }
+}
+
+exports.setup = setup;
diff --git a/lib/polyfill.js b/lib/polyfill.js
new file mode 100644
index 0000000..7628b17
--- /dev/null
+++ b/lib/polyfill.js
@@ -0,0 +1,538 @@
+'use strict';
+
+// This monstrosity matches any valid `[foo="bar"]` block, with either quote style. Parenthesis
+// have no special meaning within an attribute selector, and the complex regexp below mostly
+// exists to allow \" or \' in string parts (e.g. `[foo="b\"ar"]`).
+const attrRe = /^\[.*?(?:(["'])(?:.|\\\1)*\1.*)*\]/;
+const walkSelectorRe = /([([,]|:scope\b)/;  // "interesting" setups
+const scopeRe = /^:scope\b/;
+
+const s = document.createElement('style');
+// are we in old IE/Firefox mode, where .selectorText can't be changed inline?
+s.textContent = '.x{color:red;}';
+document.head.appendChild(s);
+s.sheet.cssRules[0].selectorText = '.change';
+const writeMode = s.sheet.cssRules[0].selectorText === '.change';
+document.head.removeChild(s);
+
+const scopedCSSOptions = {
+  'applyToClass': false,
+  'prefix': '__scoped_',
+};
+
+Object.defineProperty(HTMLStyleElement.prototype, 'scoped', {
+  enumerable: true,
+  get() {
+    return this.hasAttribute('scoped');
+  },
+  set(v) {
+    if (v) {
+      this.setAttribute('scoped', this.getAttribute('scoped') || '');
+    } else {
+      this.removeAttribute('scoped');
+    }
+  },
+});
+
+/**
+ * @type {!Map<!HTMLStyleElement, {attrName: string, prefix: string, parent: !HTMLElement}>}
+ */
+const styleNodes = new Map();
+
+/**
+ * Consumes a single selector from candidate selector text, which may contain many.
+ *
+ * @param {string} raw selector text
+ * @return {?{selector: string, rest: string}}
+ */
+function consumeSelector(raw, prefix) {
+  let i = raw.search(walkSelectorRe);
+  if (i === -1) {
+    // found literally nothing interesting, success
+    return {
+      selector: `${prefix} ${raw}`,
+      rest: '',
+    };
+  } else if (raw[i] === ',') {
+    // found comma without anything interesting, yield rest
+    return {
+      selector: `${prefix} ${raw.substr(0, i)}`,
+      rest: raw.substr(i + 1),
+    }
+  }
+
+  let leftmost = true;   // whether we're past a descendant or similar selector
+  let scope = false;     // whether :scope has been found + replaced
+  i = raw.search(/\S/);  // place i after initial whitespace only
+
+  let depth = 0;
+outer:
+  for (; i < raw.length; ++i) {
+    const char = raw[i];
+    switch (char) {
+      case '[':
+        const match = attrRe.exec(raw.substr(i));
+        i += (match ? match[0].length : 1) - 1;  // we add 1 every loop
+        continue;
+
+      case '(':
+        ++depth;
+        continue;
+
+      case ':':
+        if (!leftmost) {
+          continue;  // doesn't matter if :scope is here, it'll always be ignored
+        } else if (!scopeRe.test(raw.substr(i))) {
+          continue;  // not ':scope', ignore
+        } else if (depth) {
+          return null;
+        }
+
+        // Replace ':scope' with our prefix. This can happen many times; ':scope:scope' is valid.
+        // It will never apply to a descendant selector (e.g., ".foo :scope") as this is ignored
+        // by browsers anyway (invalid).
+        raw = raw.substring(0, i) + prefix + raw.substr(i + 6);
+        i += prefix.length;
+        scope = true;
+        --i;  // we'd skip over next character otherwise
+        continue;  // run loop again
+
+      case ')':
+        if (depth) {
+          --depth;
+        }
+        continue;
+    }
+    if (depth) {
+      continue;
+    }
+
+    switch (char) {
+      case ',':
+        break outer;
+
+      case ' ':
+      case '>':
+      case '~':
+      case '+':
+        if (!leftmost) {
+          continue;
+        }
+        leftmost = false;
+    }
+  }
+
+  const selector = (scope ? '' : `${prefix} `) + raw.substr(0, i);
+  return {selector, rest: raw.substr(i + 1)};
+}
+
+function updateSelectorText(selectorText, prefix) {
+  const found = [];
+
+  while (selectorText) {
+    const consumed = consumeSelector(selectorText, prefix);
+    if (consumed === null) {
+      return ':not(*)';
+    }
+    found.push(consumed.selector);
+    selectorText = consumed.rest;
+  }
+
+  return found.join(', ');
+}
+
+
+/**
+ * Upgrades a specific CSSRule.
+ *
+ * @param {!CSSRule} rule
+ * @param {string} prefix to apply
+ * @param {!CSSMediaRule|!CSSStyleSheet} group
+ * @param {number} index in group
+ */
+function upgradeRule(rule, prefix, group, index) {
+  if (rule instanceof CSSMediaRule) {
+    // upgrade children
+    const l = rule.cssRules.length;
+    for (let j = 0; j < l; ++j) {
+      upgradeRule(rule.cssRules[j], prefix, rule, j);
+    }
+    return;
+  }
+
+  if (!(rule instanceof CSSStyleRule)) {
+    return;  // unknown rule type, ignore
+  }
+
+  const update = updateSelectorText(rule.selectorText, prefix);
+
+  if (writeMode) {
+    // anything but old IE/Firefox
+    rule.selectorText = update;
+  } else {
+    // old browsers which don't allow modification of selectorText
+    const cssText = rule.style.cssText;  // save before we delete
+    group.deleteRule(index);
+    group.insertRule(`${update} {${cssText}}`, index);
+  }
+}
+
+
+/**
+ * @param {!CSSRule} rule
+ * @return {Node} owner of rule
+ */
+function ownerNode(rule) {
+  let sheet = rule.parentStyleSheet;
+  while (sheet) {
+    if (sheet.ownerNode) {
+      return sheet.ownerNode;
+    }
+    sheet = sheet.parentStyleSheet;
+  }
+  return null;
+}
+
+
+/**
+ * Replaces a live rule, returning the new `CSSRule` that it was replaced with.
+ *
+ * @param {!CSSRule} rule
+ * @param {string} update to replace with
+ * @return {!CSSRule}
+ */
+function replaceRule(rule, update) {
+  const parent = rule.parentStyleSheet;
+  let i;
+  for (i = 0; i < parent.rules.length; ++i) {
+    if (parent.rules[i] === rule) {
+      break;
+    }
+  }
+  parent.removeRule(i);
+  parent.insertRule(update, i);
+
+  return parent.rules[i];
+}
+
+
+/**
+ * @param {!CSSStyleSheet} sheet
+ * @return {?{code: number}} the DOMException found while accessing this CSS
+ */
+function sheetRulesError(sheet) {
+  // FIXME: This monstrosity just convinces Closure that `sheet.cssRules` has side-effects.
+  let rules = null;
+  try {
+    rules = sheet.cssRules;
+  } catch (e) {
+    if (e instanceof DOMException) {
+      return e;
+    }
+    throw e;
+  }
+  if (rules) {
+    return null;
+  }
+
+  // Safari no longer throws an error here, just pretend we can't read the data.
+  return {code: DOMException.SECURITY_ERR};
+}
+
+// TODO: upgradeSheet could return a Promise or then-like
+
+/**
+ * @param {!CSSStyleSheet} sheet already loaded CSSStyleSheet
+ * @param {string} prefix to apply
+ * @return {boolean} if applied immediately
+ */
+const upgradeSheet = (function() {
+
+  /** @type {!WeakMap<!StyleSheet, string>} */
+  const upgradedSheets = new WeakMap();
+
+  /** @type {!Map<!CSSImportRule, string>} */
+  const pendingImportRule = new Map();
+
+  /** @type {!Map<!CSSStyleSheet, string>} */
+  const pendingInvalidSheet = new Map();
+
+  /**
+   * Callback inside rAF to monitor for @import-style loading or for parsing CSS script tags.
+   * This is ugly, but only happens on styles that are moved or inserted dynamically (static
+   * styles all fire at once).
+   */
+  const requestCheck = (function() {
+    let rAF = 0;
+
+    function check() {
+      let again = false;
+      rAF = 0;
+
+      pendingImportRule.forEach((prefix, importRule) => {
+        if (importRule.styleSheet) {
+          internalUpgrade(importRule.styleSheet, prefix);
+        } else if (ownerNode(importRule)) {
+          again = true;
+          return;  // still valid, do nothing
+        }
+        pendingImportRule.delete(importRule);
+      });
+
+      pendingInvalidSheet.forEach((prefix, sheet) => {
+        if (sheetRulesError(sheet)) {
+          again = true;
+          return;
+        }
+        internalUpgrade(sheet, prefix);
+        pendingInvalidSheet.delete(sheet);
+      });
+
+      // check again next frame
+      if (again) {
+        rAF = window.requestAnimationFrame(check);
+      }
+    }
+
+    return function() {
+      rAF = rAF || window.requestAnimationFrame(check);
+    };
+  }());
+
+  /**
+   * @param {!CSSStyleSheet} sheet
+   * @param {string} prefix
+   */
+  function internalUpgrade(sheet, prefix) {
+    if (upgradedSheets.get(sheet) === prefix) {
+      return;  // already done
+    }
+
+    const e = sheetRulesError(sheet);
+    if (e) {
+      switch (e.code) {
+        case DOMException.SECURITY_ERR:
+          // Occurs if we try to examine a cross-domain CSS file. Fetch it ourselves and update
+          // the CSS once it is available on a 'local' URL.
+          const x = new XMLHttpRequest();
+          x.responseType = 'blob';
+          x.open('GET', sheet.href);
+
+          // This must also be replaced with a temporary @import, as @import must all appear
+          // first. Use a base64 URL that doesn't actually contain anything.
+          const rule = replaceRule(
+              /** @type {!CSSRule} */ (sheet.ownerRule),
+              `@import url('data:text/css;base64,')`
+          );
+
+          x.onload = () => {
+            const url = URL.createObjectURL(/** @type {!Blob} */ (x.response));
+            const update = /** @type {!CSSImportRule} */ (replaceRule(rule, `@import '${url}'`));
+            pendingImportRule.set(update, prefix);
+            requestCheck();
+
+            // We can revoke this URL immediately as it's seemingly read synchronously.
+            URL.revokeObjectURL(url);
+          };
+          // nb. no onerror handling
+
+          x.send();
+          return;
+
+        case DOMException.INVALID_ACCESS_ERR:
+          // This occurs in Firefox if the CSS is yet to be parsed (for dynamic cases), see:
+          //   https://bugzilla.mozilla.org/show_bug.cgi?id=761236
+          pendingInvalidSheet.set(sheet, prefix);
+          requestCheck();
+          return;
+
+        default:
+          throw e;
+      }
+    }
+
+    // Hooray, the sheet is ready to go!
+    upgradedSheets.set(sheet, prefix);
+
+    const l = sheet.cssRules.length;
+    for (let i = 0; i < l; ++i) {
+      const rule = sheet.cssRules[i];
+
+      if (!(rule instanceof CSSImportRule)) {
+        upgradeRule(rule, prefix, sheet, i);
+        continue;
+      }
+
+      if (rule.styleSheet) {
+        // TODO: recursion is bad
+        internalUpgrade(rule.styleSheet, prefix);
+        continue;
+      }
+
+      // otherwise, add to pending queue
+      pendingImportRule.set(rule, prefix);
+      requestCheck();
+    }
+
+    return true;
+  }
+
+  return internalUpgrade;
+}());
+
+
+/**
+ * @param {!HTMLStyleElement} node to reset
+ */
+function resetCSS(node) {
+  const css = node.textContent;
+  node.textContent = '';
+  node.textContent = css;
+}
+
+
+function applyToAttr(node, attrName, apply) {
+  // default version is to apply to attributes
+  if (apply) {
+    node.setAttribute(attrName, '');
+  } else {
+    node.removeAttribute(attrName);
+  }
+}
+
+function applyToClass(node, attrName, apply) {
+  if (apply) {
+    node.classList.add(attrName);
+  } else {
+    node.classList.remove(attrName);
+  }
+}
+
+
+let applyMode = applyToAttr;
+let uniqueId = 0;
+
+
+function upgrade(node) {
+  const effectiveParent = node['scoped'] && document.body.contains(node) ? node.parentNode : null;
+
+  const state = styleNodes.get(node);
+  if (state) {
+    if (!effectiveParent) {
+      // disappearing, clear state and ask browser to reset CSS
+      styleNodes.delete(node);
+      resetCSS(node);
+    } else if (node.sheet) {
+      // otherwise, upgrade the sheet (succeeds if already done)
+      // nb. node.sheet is null if being removed
+      upgradeSheet(node.sheet, state.prefix);
+    }
+
+    if (state.parent !== effectiveParent) {
+      state.parent && applyMode(state.parent, state.attrName, false);
+      effectiveParent && applyMode(effectiveParent, state.attrName, true);
+      state.parent = effectiveParent;
+    }
+
+    return false;  // already upgraded
+  }
+
+  if (!effectiveParent) {
+    return;  // not scoped CSS, never seen before, ignore
+  }
+
+  // TODO: use hash for deduping
+  // const hash = hashCode(node.textContent);
+
+  // newly found style node, setup attr
+  const attrName = `${scopedCSSOptions['prefix']}${++uniqueId}`;
+  const prefix = applyMode === applyToAttr ? `[${attrName}]` : `.${attrName}`;
+  styleNodes.set(node, {attrName, prefix, parent: node.parentNode});
+
+  upgradeSheet(node.sheet, prefix);
+  applyMode(effectiveParent, attrName, true);
+}
+
+// this mess basically calls resolve() with any <style> nodes that changed/removed/added
+// TODO: is it faster to just call getElementsByTagName('style') and compare to previous
+const mo = new MutationObserver((records) => {
+  const changes = new Set();
+  const iterate = (nodes) => {
+    let i = nodes ? nodes.length : 0;
+    while (i) {
+      const node = nodes[--i];
+      if (!(node instanceof HTMLElement)) {
+        continue;  // text node
+      }
+      if (node instanceof HTMLStyleElement) {
+        changes.add(node);  // directly a <style>
+        continue;
+      }
+      // look for changed children
+      const cand = node.getElementsByTagName('style');
+      let j = cand.length;
+      while (j) {
+        changes.add(cand[--j]);
+      }
+    }
+  };
+
+  records.forEach((record) => {
+    if (record.target instanceof HTMLStyleElement) {
+      changes.add(record.target);
+    } else {
+      iterate(record.addedNodes);
+      iterate(record.removedNodes);
+    }
+  });
+
+  changes.forEach(upgrade);
+});
+
+function setup() {
+  // clone any options from global
+  const cand = window['scopedCSS'];
+  if (typeof cand === 'object') {
+    for (let k in scopedCSSOptions) {
+      if (k in cand) {
+        scopedCSSOptions[k] = cand[k];
+      }
+    }
+
+    if (scopedCSSOptions['applyToClass']) {
+      applyMode = applyToClass;
+    }
+  }
+
+  // nb. watch for attributeFilter: ['scoped'] to detect a CSS rule changing at runtime
+  const options = {childList: true, subtree: true, attributes: true, attributeFilter: ['scoped']};
+  mo.observe(document, options);
+  const collection = document.body.getElementsByTagName('style');
+  for (let i = 0; i < collection.length; ++i) {
+    upgrade(collection[i]);
+  }
+}
+
+/*
+ * Copyright 2017 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+console.log("scoped");
+
+if (document.readyState === 'loading') {
+  window.addEventListener('DOMContentLoaded', setup);
+} else {
+  setup();
+}
diff --git a/package-lock.json b/package-lock.json
index 4905933..8f4ef41 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,7 +9,109 @@
       "version": "0.2.2",
       "license": "Apache-2",
       "devDependencies": {
-        "headless-test": "^1.0.3"
+        "cross-env": "^7.0.3",
+        "google-closure-compiler": "^20220301.0.0",
+        "headless-test": "^1.0.3",
+        "npm-run-all": "^4.1.5",
+        "rollup": "^1.32.1",
+        "rollup-plugin-uglify": "^6.0.4"
+      }
+    },
+    "node_modules/@babel/code-frame": {
+      "version": "7.16.7",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.16.7.tgz",
+      "integrity": "sha512-iAXqUn8IIeBTNd72xsFlgaXHkMBMt6y4HJp1tIaK465CWLT/fG1aqB7ykr95gHHmlBdGbFeWWfyB4NJJ0nmeIg==",
+      "dev": true,
+      "dependencies": {
+        "@babel/highlight": "^7.16.7"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/helper-validator-identifier": {
+      "version": "7.16.7",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.16.7.tgz",
+      "integrity": "sha512-hsEnFemeiW4D08A5gUAZxLBTXpZ39P+a+DGDsHw1yxqyQ/jzFEnxf5uTEGp+3bzAbNOxU1paTgYS4ECU/IgfDw==",
+      "dev": true,
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/highlight": {
+      "version": "7.16.10",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.16.10.tgz",
+      "integrity": "sha512-5FnTQLSLswEj6IkgVw5KusNUUFY9ZGqe/TRFnP/BKYHYgfh7tc+C7mwiy95/yNP7Dh9x580Vv8r7u7ZfTBFxdw==",
+      "dev": true,
+      "dependencies": {
+        "@babel/helper-validator-identifier": "^7.16.7",
+        "chalk": "^2.0.0",
+        "js-tokens": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/highlight/node_modules/ansi-styles": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+      "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+      "dev": true,
+      "dependencies": {
+        "color-convert": "^1.9.0"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/@babel/highlight/node_modules/chalk": {
+      "version": "2.4.2",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
+      "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
+      "dev": true,
+      "dependencies": {
+        "ansi-styles": "^3.2.1",
+        "escape-string-regexp": "^1.0.5",
+        "supports-color": "^5.3.0"
+      },
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+      "requires": {
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+        "spdx-license-ids": "^3.0.0"
+      }
+    },
+    "spdx-exceptions": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/spdx-exceptions/-/spdx-exceptions-2.3.0.tgz",
+      "integrity": "sha512-/tTrYOC7PPI1nUAgx34hUpqXuyJG+DTHJTnIULG4rDygi4xu/tfgmq1e1cIRwRzwZgo4NLySi+ricLkZkw4i5A==",
+      "dev": true
+    },
+    "spdx-expression-parse": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/spdx-expression-parse/-/spdx-expression-parse-3.0.1.tgz",
+      "integrity": "sha512-cbqHunsQWnJNE6KhVSMsMeH5H/L9EpymbzqTQ3uLwNCLZ1Q481oWaofqH7nO6V07xlXwY6PhQdQ2IedWx/ZK4Q==",
+      "dev": true,
+      "requires": {
+        "spdx-exceptions": "^2.1.0",
+        "spdx-license-ids": "^3.0.0"
+      }
+    },
+    "spdx-license-ids": {
+      "version": "3.0.11",
+      "resolved": "https://registry.npmjs.org/spdx-license-ids/-/spdx-license-ids-3.0.11.tgz",
+      "integrity": "sha512-Ctl2BrFiM0X3MANYgj3CkygxhRmr9mi6xhejbdO960nF6EDJApTYpn0BQnDKlnNBULKiCN1n3w9EBkHK8ZWg+g==",
+      "dev": true
+    },
     "sprintf-js": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
@@ -3233,46 +5083,35 @@
         "strip-ansi": "^4.0.0"
       }
     },
-    "string.prototype.trimend": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/string.prototype.trimend/-/string.prototype.trimend-1.0.1.tgz",
-      "integrity": "sha512-LRPxFUaTtpqYsTeNKaFOw3R4bxIzWOnbQ837QfBylo8jIxtcbK/A/sMV7Q+OAV/vWo+7s25pOE10KYSjaSO06g==",
-      "dev": true,
-      "requires": {
-        "define-properties": "^1.1.3",
-        "es-abstract": "^1.17.5"
-      }
-    },
-    "string.prototype.trimleft": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/string.prototype.trimleft/-/string.prototype.trimleft-2.1.2.tgz",
-      "integrity": "sha512-gCA0tza1JBvqr3bfAIFJGqfdRTyPae82+KTnm3coDXkZN9wnuW3HjGgN386D7hfv5CHQYCI022/rJPVlqXyHSw==",
+    "string.prototype.padend": {
+      "version": "3.1.3",
+      "resolved": "https://registry.npmjs.org/string.prototype.padend/-/string.prototype.padend-3.1.3.tgz",
+      "integrity": "sha512-jNIIeokznm8SD/TZISQsZKYu7RJyheFNt84DUPrh482GC8RVp2MKqm2O5oBRdGxbDQoXrhhWtPIWQOiy20svUg==",
       "dev": true,
       "requires": {
+        "call-bind": "^1.0.2",
         "define-properties": "^1.1.3",
-        "es-abstract": "^1.17.5",
-        "string.prototype.trimstart": "^1.0.0"
+        "es-abstract": "^1.19.1"
       }
     },
-    "string.prototype.trimright": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/string.prototype.trimright/-/string.prototype.trimright-2.1.2.tgz",
-      "integrity": "sha512-ZNRQ7sY3KroTaYjRS6EbNiiHrOkjihL9aQE/8gfQ4DtAC/aEBRHFJa44OmoWxGGqXuJlfKkZW4WcXErGr+9ZFg==",
+    "string.prototype.trimend": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/string.prototype.trimend/-/string.prototype.trimend-1.0.4.tgz",
+      "integrity": "sha512-y9xCjw1P23Awk8EvTpcyL2NIr1j7wJ39f+k6lvRnSMz+mz9CGz9NYPelDk42kOz6+ql8xjfK8oYzy3jAP5QU5A==",
       "dev": true,
       "requires": {
-        "define-properties": "^1.1.3",
-        "es-abstract": "^1.17.5",
-        "string.prototype.trimend": "^1.0.0"
+        "call-bind": "^1.0.2",
+        "define-properties": "^1.1.3"
       }
     },
     "string.prototype.trimstart": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/string.prototype.trimstart/-/string.prototype.trimstart-1.0.1.tgz",
-      "integrity": "sha512-XxZn+QpvrBI1FOcg6dIpxUPgWCPuNXvMD72aaRaUQv1eD4e/Qy8i/hFTe0BUmD60p/QA6bh1avmuPTfNjqVWRw==",
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/string.prototype.trimstart/-/string.prototype.trimstart-1.0.4.tgz",
+      "integrity": "sha512-jh6e984OBfvxS50tdY2nRZnoC5/mLFKOREQfw8t5yytkoUsJRNxvI/E39qu1sD0OtWI3OC0XgKSmcWwziwYuZw==",
       "dev": true,
       "requires": {
-        "define-properties": "^1.1.3",
-        "es-abstract": "^1.17.5"
+        "call-bind": "^1.0.2",
+        "define-properties": "^1.1.3"
       }
     },
     "strip-ansi": {
@@ -3284,6 +5123,12 @@
         "ansi-regex": "^3.0.0"
       }
     },
+    "strip-bom": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-3.0.0.tgz",
+      "integrity": "sha1-IzTBjpx1n3vdVv3vfprj1YjmjtM=",
+      "dev": true
+    },
     "strip-eof": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz",
@@ -3305,6 +5150,12 @@
         "has-flag": "^4.0.0"
       }
     },
+    "supports-preserve-symlinks-flag": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/supports-preserve-symlinks-flag/-/supports-preserve-symlinks-flag-1.0.0.tgz",
+      "integrity": "sha512-ot0WnXS9fgdkgIcePe6RHNk1WA8+muPa6cSjeR3V8K27q9BB1rTE3R1p7Hv0z1ZyAc8s6Vvv8DIyWf681MAt0w==",
+      "dev": true
+    },
     "to-regex-range": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
@@ -3326,12 +5177,63 @@
       "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
       "dev": true
     },
+    "uglify-js": {
+      "version": "3.15.3",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.15.3.tgz",
+      "integrity": "sha512-6iCVm2omGJbsu3JWac+p6kUiOpg3wFO2f8lIXjfEb8RrmLjzog1wTPMmwKB7swfzzqxj9YM+sGUM++u1qN4qJg==",
+      "dev": true
+    },
+    "unbox-primitive": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/unbox-primitive/-/unbox-primitive-1.0.1.tgz",
+      "integrity": "sha512-tZU/3NqK3dA5gpE1KtyiJUrEB0lxnGkMFHptJ7q6ewdZ8s12QrODwNbhIJStmJkd1QDXa1NRA8aF2A1zk/Ypyw==",
+      "dev": true,
+      "requires": {
+        "function-bind": "^1.1.1",
+        "has-bigints": "^1.0.1",
+        "has-symbols": "^1.0.2",
+        "which-boxed-primitive": "^1.0.2"
+      }
+    },
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
       "dev": true
     },
+    "validate-npm-package-license": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
+      "integrity": "sha512-DpKm2Ui/xN7/HQKCtpZxoRWBhZ9Z0kqtygG8XCgNQ8ZlDnxuQmWhj566j8fN4Cu3/JmbhsDo7fcAJq4s9h27Ew==",
+      "dev": true,
+      "requires": {
+        "spdx-correct": "^3.0.0",
+        "spdx-expression-parse": "^3.0.0"
+      }
+    },
+    "vinyl": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/vinyl/-/vinyl-2.2.1.tgz",
+      "integrity": "sha512-LII3bXRFBZLlezoG5FfZVcXflZgWP/4dCwKtxd5ky9+LOtM4CS3bIRQsmR1KMnMW07jpE8fqR2lcxPZ+8sJIcw==",
+      "dev": true,
+      "requires": {
+        "clone": "^2.1.1",
+        "clone-buffer": "^1.0.0",
+        "clone-stats": "^1.0.0",
+        "cloneable-readable": "^1.0.0",
+        "remove-trailing-separator": "^1.0.1",
+        "replace-ext": "^1.0.0"
+      }
+    },
+    "vinyl-sourcemaps-apply": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/vinyl-sourcemaps-apply/-/vinyl-sourcemaps-apply-0.2.1.tgz",
+      "integrity": "sha1-q2VJ1h0XLCsbh75cUI0jnI74dwU=",
+      "dev": true,
+      "requires": {
+        "source-map": "^0.5.1"
+      }
+    },
     "which": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
@@ -3341,6 +5243,19 @@
         "isexe": "^2.0.0"
       }
     },
+    "which-boxed-primitive": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/which-boxed-primitive/-/which-boxed-primitive-1.0.2.tgz",
+      "integrity": "sha512-bwZdv0AKLpplFY2KZRX6TvyuN7ojjr7lwkg6ml0roIy9YeuSr7JS372qlNW18UQYzgYK9ziGcerWqZOmEn9VNg==",
+      "dev": true,
+      "requires": {
+        "is-bigint": "^1.0.1",
+        "is-boolean-object": "^1.1.0",
+        "is-number-object": "^1.0.4",
+        "is-string": "^1.0.5",
+        "is-symbol": "^1.0.3"
+      }
+    },
     "which-module": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
diff --git a/package.json b/package.json
index ad2d134..6365917 100644
--- a/package.json
+++ b/package.json
@@ -2,13 +2,31 @@
   "name": "style-scoped",
   "version": "0.2.2",
   "description": "style[scoped] polyfill",
-  "main": "scoped.min.js",
+  "main": "lib/index.js",
+  "module": "src/index.js",
+  "jsnext:main": "src/index.js",
+  "files": [
+    "src",
+    "lib",
+    "dist"
+  ],
   "author": "Sam Thorogood <sam.thorogood@gmail.com>",
   "license": "Apache-2",
   "scripts": {
-    "test": "headless-test --cors test.js"
+    "test": "npm run build:umd-polyfill && headless-test --cors test.js",
+    "closure": "google-closure-compiler --js=src/*.js --checks_only --module_resolution=node --compilation_level=ADVANCED",
+    "build": "run-p build:**",
+    "build:cjs": "rollup -i src/index.js -o lib/index.js -f cjs",
+    "build:cjs-polyfill": "rollup -i src/polyfill.js -o lib/polyfill.js -f cjs",
+    "build:umd-polyfill": "cross-env NODE_ENV=development rollup -i src/polyfill.js -o dist/scoped.js -c rollup.umd.config.js",
+    "build:umd-polyfill:min": "cross-env NODE_ENV=production rollup -i src/polyfill.js -o dist/scoped.min.js -c rollup.umd.config.js"
   },
   "devDependencies": {
-    "headless-test": "^1.0.3"
+    "cross-env": "^7.0.3",
+    "google-closure-compiler": "^20220301.0.0",
+    "headless-test": "^1.0.3",
+    "npm-run-all": "^4.1.5",
+    "rollup": "^1.32.1",
+    "rollup-plugin-uglify": "^6.0.4"
   }
 }
diff --git a/rollup.umd.config.js b/rollup.umd.config.js
new file mode 100644
index 0000000..7e71fa9
--- /dev/null
+++ b/rollup.umd.config.js
@@ -0,0 +1,23 @@
+import { uglify } from 'rollup-plugin-uglify';
+
+const umdConfig = {
+  output: {
+    format: 'umd',
+    name: 'scoped',
+  },
+  plugins: []
+};
+
+if (process.env.NODE_ENV === 'production') {
+  umdConfig.plugins.push(
+    uglify({
+      compress: {
+        pure_getters: true,
+        unsafe: true,
+        unsafe_comps: true,
+      },
+    })
+  );
+}
+
+export default umdConfig;
\ No newline at end of file
diff --git a/scoped.min.js b/scoped.min.js
deleted file mode 100644
index 9b1806c..0000000
--- a/scoped.min.js
+++ /dev/null
@@ -1,9 +0,0 @@
-(function(){function C(a,c){var b=a.search(D);if(-1===b)return{h:c+" "+a,g:""};if(","===a[b])return{h:c+" "+a.substr(0,b),g:a.substr(b+1)};var d=!0,g=!1;b=a.search(/\S/);var e=0;a:for(;b<a.length;++b){var f=a[b];switch(f){case "[":f=E.exec(a.substr(b));b+=(f?f[0].length:1)-1;continue;case "(":++e;continue;case ":":if(!d)continue;else if(!F.test(a.substr(b)))continue;else if(e)return null;a=a.substring(0,b)+c+a.substr(b+6);b+=c.length;g=!0;--b;continue;case ")":e&&--e;continue}if(!e)switch(f){case ",":break a;
-case " ":case ">":case "~":case "+":d&&(d=!1)}}return{h:(g?"":c+" ")+a.substr(0,b),g:a.substr(b+1)}}function u(a,c,b,d){if(a instanceof CSSMediaRule)for(b=a.cssRules.length,d=0;d<b;++d)u(a.cssRules[d],c,a,d);else if(a instanceof CSSStyleRule){a:{for(var g=a.selectorText,e=[];g;){g=C(g,c);if(null===g){c=":not(*)";break a}e.push(g.h);g=g.g}c=e.join(", ")}G?a.selectorText=c:(a=a.style.cssText,b.deleteRule(d),b.insertRule(c+" {"+a+"}",d))}}function v(a,c){var b=a.parentStyleSheet,d;for(d=0;d<b.rules.length&&
-b.rules[d]!==a;++d);b.removeRule(d);b.insertRule(c,d);return b.rules[d]}function w(a){var c=null;try{c=a.cssRules}catch(b){if(b instanceof DOMException)return b;throw b;}return c?null:{code:DOMException.SECURITY_ERR}}function x(a,c,b){b?a.setAttribute(c,""):a.removeAttribute(c)}function H(a,c,b){b?a.classList.add(c):a.classList.remove(c)}function y(a){var c=a.scoped&&document.body.contains(a)?a.parentNode:null,b=t.get(a);if(b){if(c)a.sheet&&z(a.sheet,b.prefix);else{t["delete"](a);var d=a.textContent;
-a.textContent="";a.textContent=d}b.parent!==c&&(b.parent&&p(b.parent,b.attrName,!1),c&&p(c,b.attrName,!0),b.parent=c);return!1}c&&(b=""+r.prefix+ ++I,d=p===x?"["+b+"]":"."+b,t.set(a,{attrName:b,prefix:d,parent:a.parentNode}),z(a.sheet,d),p(c,b,!0))}function A(){var a=window.scopedCSS;if("object"===typeof a){for(var c in r)c in a&&(r[c]=a[c]);r.applyToClass&&(p=H)}J.observe(document,{childList:!0,subtree:!0,attributes:!0,attributeFilter:["scoped"]});a=document.body.getElementsByTagName("style");for(c=
-0;c<a.length;++c)y(a[c])}var n=document.createElement("style");if(!("scoped"in n)){var r={applyToClass:!1,prefix:"__scoped_"};n.textContent=".x{color:red;}";document.head.appendChild(n);n.sheet.cssRules[0].selectorText=".change";var G=".change"===n.sheet.cssRules[0].selectorText;document.head.removeChild(n);Object.defineProperty(HTMLStyleElement.prototype,"scoped",{enumerable:!0,get:function(){return this.hasAttribute("scoped")},set:function(a){a?this.setAttribute("scoped",this.getAttribute("scoped")||
-""):this.removeAttribute("scoped")}});var t=new Map,E=/^\[.*?(?:(["'])(?:.|\\\1)*\1.*)*\]/,D=/([([,]|:scope\b)/,F=/^:scope\b/,z=function(){function a(e,f){if(c.get(e)!==f){var l=w(e);if(l)switch(l.code){case DOMException.SECURITY_ERR:var m=new XMLHttpRequest;m.responseType="blob";m.open("GET",e.href);var k=v(e.ownerRule,"@import url('data:text/css;base64,')");m.onload=function(){var B=URL.createObjectURL(m.response),K=v(k,"@import '"+B+"'");b.set(K,f);g();URL.revokeObjectURL(B)};m.send();return;case DOMException.INVALID_ACCESS_ERR:d.set(e,
-f);g();return;default:throw l;}c.set(e,f);l=e.cssRules.length;for(var h=0;h<l;++h){var q=e.cssRules[h];q instanceof CSSImportRule?q.styleSheet?a(q.styleSheet,f):(b.set(q,f),g()):u(q,f,e,h)}return!0}}var c=new WeakMap,b=new Map,d=new Map,g=function(){function e(){var l=!1;f=0;b.forEach(function(m,k){if(k.styleSheet)a(k.styleSheet,m);else{var h;a:{for(h=k.parentStyleSheet;h;){if(h.ownerNode){h=h.ownerNode;break a}h=h.parentStyleSheet}h=null}if(h){l=!0;return}}b["delete"](k)});d.forEach(function(m,k){w(k)?
-l=!0:(a(k,m),d["delete"](k))});l&&(f=window.requestAnimationFrame(e))}var f=0;return function(){f=f||window.requestAnimationFrame(e)}}();return a}(),p=x,I=0,J=new MutationObserver(function(a){function c(d){for(var g=d?d.length:0;g;){var e=d[--g];if(e instanceof HTMLElement)if(e instanceof HTMLStyleElement)b.add(e);else{e=e.getElementsByTagName("style");for(var f=e.length;f;)b.add(e[--f])}}}var b=new Set;a.forEach(function(d){d.target instanceof HTMLStyleElement?b.add(d.target):(c(d.addedNodes),c(d.removedNodes))});
-b.forEach(y)});"loading"===document.readyState?window.addEventListener("DOMContentLoaded",A):A()}})();
diff --git a/src/index.js b/src/index.js
new file mode 100644
index 0000000..b8525ce
--- /dev/null
+++ b/src/index.js
@@ -0,0 +1,517 @@
+import { attrRe, walkSelectorRe, scopeRe } from './regex';
+
+const s = document.createElement('style');
+// are we in old IE/Firefox mode, where .selectorText can't be changed inline?
+s.textContent = '.x{color:red;}';
+document.head.appendChild(s);
+s.sheet.cssRules[0].selectorText = '.change';
+const writeMode = s.sheet.cssRules[0].selectorText === '.change';
+document.head.removeChild(s);
+
+const scopedCSSOptions = {
+  'applyToClass': false,
+  'prefix': '__scoped_',
+};
+
+Object.defineProperty(HTMLStyleElement.prototype, 'scoped', {
+  enumerable: true,
+  get() {
+    return this.hasAttribute('scoped');
+  },
+  set(v) {
+    if (v) {
+      this.setAttribute('scoped', this.getAttribute('scoped') || '');
+    } else {
+      this.removeAttribute('scoped');
+    }
+  },
+});
+
+/**
+ * @type {!Map<!HTMLStyleElement, {attrName: string, prefix: string, parent: !HTMLElement}>}
+ */
+const styleNodes = new Map();
+
+
+function hashCode(s) {
+  let hash = 5381;
+  let j = s.length;
+  while (j) {
+    hash = (hash * 33) ^ s.charCodeAt(--j);
+  }
+  return hash;
+}
+
+/**
+ * Consumes a single selector from candidate selector text, which may contain many.
+ *
+ * @param {string} raw selector text
+ * @return {?{selector: string, rest: string}}
+ */
+function consumeSelector(raw, prefix) {
+  let i = raw.search(walkSelectorRe);
+  if (i === -1) {
+    // found literally nothing interesting, success
+    return {
+      selector: `${prefix} ${raw}`,
+      rest: '',
+    };
+  } else if (raw[i] === ',') {
+    // found comma without anything interesting, yield rest
+    return {
+      selector: `${prefix} ${raw.substr(0, i)}`,
+      rest: raw.substr(i + 1),
+    }
+  }
+
+  let leftmost = true;   // whether we're past a descendant or similar selector
+  let scope = false;     // whether :scope has been found + replaced
+  i = raw.search(/\S/);  // place i after initial whitespace only
+
+  let depth = 0;
+outer:
+  for (; i < raw.length; ++i) {
+    const char = raw[i];
+    switch (char) {
+      case '[':
+        const match = attrRe.exec(raw.substr(i));
+        i += (match ? match[0].length : 1) - 1;  // we add 1 every loop
+        continue;
+
+      case '(':
+        ++depth;
+        continue;
+
+      case ':':
+        if (!leftmost) {
+          continue;  // doesn't matter if :scope is here, it'll always be ignored
+        } else if (!scopeRe.test(raw.substr(i))) {
+          continue;  // not ':scope', ignore
+        } else if (depth) {
+          return null;
+        }
+
+        // Replace ':scope' with our prefix. This can happen many times; ':scope:scope' is valid.
+        // It will never apply to a descendant selector (e.g., ".foo :scope") as this is ignored
+        // by browsers anyway (invalid).
+        raw = raw.substring(0, i) + prefix + raw.substr(i + 6);
+        i += prefix.length;
+        scope = true;
+        --i;  // we'd skip over next character otherwise
+        continue;  // run loop again
+
+      case ')':
+        if (depth) {
+          --depth;
+        }
+        continue;
+    }
+    if (depth) {
+      continue;
+    }
+
+    switch (char) {
+      case ',':
+        break outer;
+
+      case ' ':
+      case '>':
+      case '~':
+      case '+':
+        if (!leftmost) {
+          continue;
+        }
+        leftmost = false;
+    }
+  }
+
+  const selector = (scope ? '' : `${prefix} `) + raw.substr(0, i);
+  return {selector, rest: raw.substr(i + 1)};
+}
+
+function updateSelectorText(selectorText, prefix) {
+  const found = [];
+
+  while (selectorText) {
+    const consumed = consumeSelector(selectorText, prefix);
+    if (consumed === null) {
+      return ':not(*)';
+    }
+    found.push(consumed.selector);
+    selectorText = consumed.rest;
+  }
+
+  return found.join(', ');
+}
+
+
+/**
+ * Upgrades a specific CSSRule.
+ *
+ * @param {!CSSRule} rule
+ * @param {string} prefix to apply
+ * @param {!CSSMediaRule|!CSSStyleSheet} group
+ * @param {number} index in group
+ */
+function upgradeRule(rule, prefix, group, index) {
+  if (rule instanceof CSSMediaRule) {
+    // upgrade children
+    const l = rule.cssRules.length;
+    for (let j = 0; j < l; ++j) {
+      upgradeRule(rule.cssRules[j], prefix, rule, j);
+    }
+    return;
+  }
+
+  if (!(rule instanceof CSSStyleRule)) {
+    return;  // unknown rule type, ignore
+  }
+
+  const update = updateSelectorText(rule.selectorText, prefix);
+
+  if (writeMode) {
+    // anything but old IE/Firefox
+    rule.selectorText = update;
+  } else {
+    // old browsers which don't allow modification of selectorText
+    const cssText = rule.style.cssText;  // save before we delete
+    group.deleteRule(index);
+    group.insertRule(`${update} {${cssText}}`, index);
+  }
+}
+
+
+/**
+ * @param {!CSSRule} rule
+ * @return {Node} owner of rule
+ */
+function ownerNode(rule) {
+  let sheet = rule.parentStyleSheet;
+  while (sheet) {
+    if (sheet.ownerNode) {
+      return sheet.ownerNode;
+    }
+    sheet = sheet.parentStyleSheet;
+  }
+  return null;
+}
+
+
+/**
+ * Replaces a live rule, returning the new `CSSRule` that it was replaced with.
+ *
+ * @param {!CSSRule} rule
+ * @param {string} update to replace with
+ * @return {!CSSRule}
+ */
+function replaceRule(rule, update) {
+  const parent = rule.parentStyleSheet;
+  let i;
+  for (i = 0; i < parent.rules.length; ++i) {
+    if (parent.rules[i] === rule) {
+      break;
+    }
+  }
+  parent.removeRule(i);
+  parent.insertRule(update, i);
+
+  return parent.rules[i];
+}
+
+
+/**
+ * @param {!CSSStyleSheet} sheet
+ * @return {?{code: number}} the DOMException found while accessing this CSS
+ */
+function sheetRulesError(sheet) {
+  // FIXME: This monstrosity just convinces Closure that `sheet.cssRules` has side-effects.
+  let rules = null;
+  try {
+    rules = sheet.cssRules;
+  } catch (e) {
+    if (e instanceof DOMException) {
+      return e;
+    }
+    throw e;
+  }
+  if (rules) {
+    return null;
+  }
+
+  // Safari no longer throws an error here, just pretend we can't read the data.
+  return {code: DOMException.SECURITY_ERR};
+}
+
+// TODO: upgradeSheet could return a Promise or then-like
+
+/**
+ * @param {!CSSStyleSheet} sheet already loaded CSSStyleSheet
+ * @param {string} prefix to apply
+ * @return {boolean} if applied immediately
+ */
+const upgradeSheet = (function() {
+
+  /** @type {!WeakMap<!StyleSheet, string>} */
+  const upgradedSheets = new WeakMap();
+
+  /** @type {!Map<!CSSImportRule, string>} */
+  const pendingImportRule = new Map();
+
+  /** @type {!Map<!CSSStyleSheet, string>} */
+  const pendingInvalidSheet = new Map();
+
+  /**
+   * Callback inside rAF to monitor for @import-style loading or for parsing CSS script tags.
+   * This is ugly, but only happens on styles that are moved or inserted dynamically (static
+   * styles all fire at once).
+   */
+  const requestCheck = (function() {
+    let rAF = 0;
+
+    function check() {
+      let again = false;
+      rAF = 0;
+
+      pendingImportRule.forEach((prefix, importRule) => {
+        if (importRule.styleSheet) {
+          internalUpgrade(importRule.styleSheet, prefix);
+        } else if (ownerNode(importRule)) {
+          again = true;
+          return;  // still valid, do nothing
+        }
+        pendingImportRule.delete(importRule);
+      });
+
+      pendingInvalidSheet.forEach((prefix, sheet) => {
+        if (sheetRulesError(sheet)) {
+          again = true;
+          return;
+        }
+        internalUpgrade(sheet, prefix);
+        pendingInvalidSheet.delete(sheet);
+      });
+
+      // check again next frame
+      if (again) {
+        rAF = window.requestAnimationFrame(check);
+      }
+    }
+
+    return function() {
+      rAF = rAF || window.requestAnimationFrame(check);
+    };
+  }());
+
+  /**
+   * @param {!CSSStyleSheet} sheet
+   * @param {string} prefix
+   */
+  function internalUpgrade(sheet, prefix) {
+    if (upgradedSheets.get(sheet) === prefix) {
+      return;  // already done
+    }
+
+    const e = sheetRulesError(sheet);
+    if (e) {
+      switch (e.code) {
+        case DOMException.SECURITY_ERR:
+          // Occurs if we try to examine a cross-domain CSS file. Fetch it ourselves and update
+          // the CSS once it is available on a 'local' URL.
+          const x = new XMLHttpRequest();
+          x.responseType = 'blob';
+          x.open('GET', sheet.href);
+
+          // This must also be replaced with a temporary @import, as @import must all appear
+          // first. Use a base64 URL that doesn't actually contain anything.
+          const rule = replaceRule(
+              /** @type {!CSSRule} */ (sheet.ownerRule),
+              `@import url('data:text/css;base64,')`
+          );
+
+          x.onload = () => {
+            const url = URL.createObjectURL(/** @type {!Blob} */ (x.response));
+            const update = /** @type {!CSSImportRule} */ (replaceRule(rule, `@import '${url}'`));
+            pendingImportRule.set(update, prefix);
+            requestCheck();
+
+            // We can revoke this URL immediately as it's seemingly read synchronously.
+            URL.revokeObjectURL(url);
+          };
+          // nb. no onerror handling
+
+          x.send();
+          return;
+
+        case DOMException.INVALID_ACCESS_ERR:
+          // This occurs in Firefox if the CSS is yet to be parsed (for dynamic cases), see:
+          //   https://bugzilla.mozilla.org/show_bug.cgi?id=761236
+          pendingInvalidSheet.set(sheet, prefix);
+          requestCheck();
+          return;
+
+        default:
+          throw e;
+      }
+    }
+
+    // Hooray, the sheet is ready to go!
+    upgradedSheets.set(sheet, prefix);
+
+    const l = sheet.cssRules.length;
+    for (let i = 0; i < l; ++i) {
+      const rule = sheet.cssRules[i];
+
+      if (!(rule instanceof CSSImportRule)) {
+        upgradeRule(rule, prefix, sheet, i);
+        continue;
+      }
+
+      if (rule.styleSheet) {
+        // TODO: recursion is bad
+        internalUpgrade(rule.styleSheet, prefix);
+        continue;
+      }
+
+      // otherwise, add to pending queue
+      pendingImportRule.set(rule, prefix);
+      requestCheck();
+    }
+
+    return true;
+  }
+
+  return internalUpgrade;
+}());
+
+
+/**
+ * @param {!HTMLStyleElement} node to reset
+ */
+function resetCSS(node) {
+  const css = node.textContent;
+  node.textContent = '';
+  node.textContent = css;
+}
+
+
+function applyToAttr(node, attrName, apply) {
+  // default version is to apply to attributes
+  if (apply) {
+    node.setAttribute(attrName, '');
+  } else {
+    node.removeAttribute(attrName);
+  }
+}
+
+function applyToClass(node, attrName, apply) {
+  if (apply) {
+    node.classList.add(attrName);
+  } else {
+    node.classList.remove(attrName);
+  }
+}
+
+
+let applyMode = applyToAttr;
+let uniqueId = 0;
+
+
+function upgrade(node) {
+  const effectiveParent = node['scoped'] && document.body.contains(node) ? node.parentNode : null;
+
+  const state = styleNodes.get(node);
+  if (state) {
+    if (!effectiveParent) {
+      // disappearing, clear state and ask browser to reset CSS
+      styleNodes.delete(node);
+      resetCSS(node);
+    } else if (node.sheet) {
+      // otherwise, upgrade the sheet (succeeds if already done)
+      // nb. node.sheet is null if being removed
+      upgradeSheet(node.sheet, state.prefix);
+    }
+
+    if (state.parent !== effectiveParent) {
+      state.parent && applyMode(state.parent, state.attrName, false);
+      effectiveParent && applyMode(effectiveParent, state.attrName, true);
+      state.parent = effectiveParent;
+    }
+
+    return false;  // already upgraded
+  }
+
+  if (!effectiveParent) {
+    return;  // not scoped CSS, never seen before, ignore
+  }
+
+  // TODO: use hash for deduping
+  // const hash = hashCode(node.textContent);
+
+  // newly found style node, setup attr
+  const attrName = `${scopedCSSOptions['prefix']}${++uniqueId}`
+  const prefix = applyMode === applyToAttr ? `[${attrName}]` : `.${attrName}`;
+  styleNodes.set(node, {attrName, prefix, parent: node.parentNode});
+
+  upgradeSheet(node.sheet, prefix);
+  applyMode(effectiveParent, attrName, true);
+}
+
+// this mess basically calls resolve() with any <style> nodes that changed/removed/added
+// TODO: is it faster to just call getElementsByTagName('style') and compare to previous
+const mo = new MutationObserver((records) => {
+  const changes = new Set();
+  const iterate = (nodes) => {
+    let i = nodes ? nodes.length : 0;
+    while (i) {
+      const node = nodes[--i];
+      if (!(node instanceof HTMLElement)) {
+        continue;  // text node
+      }
+      if (node instanceof HTMLStyleElement) {
+        changes.add(node);  // directly a <style>
+        continue;
+      }
+      // look for changed children
+      const cand = node.getElementsByTagName('style');
+      let j = cand.length;
+      while (j) {
+        changes.add(cand[--j]);
+      }
+    }
+  };
+
+  records.forEach((record) => {
+    if (record.target instanceof HTMLStyleElement) {
+      changes.add(record.target);
+    } else {
+      iterate(record.addedNodes);
+      iterate(record.removedNodes);
+    }
+  });
+
+  changes.forEach(upgrade);
+});
+
+export function setup() {
+  // clone any options from global
+  const cand = window['scopedCSS'];
+  if (typeof cand === 'object') {
+    for (let k in scopedCSSOptions) {
+      if (k in cand) {
+        scopedCSSOptions[k] = cand[k];
+      }
+    }
+
+    if (scopedCSSOptions['applyToClass']) {
+      applyMode = applyToClass;
+    }
+  }
+
+  // nb. watch for attributeFilter: ['scoped'] to detect a CSS rule changing at runtime
+  const options = {childList: true, subtree: true, attributes: true, attributeFilter: ['scoped']};
+  mo.observe(document, options);
+  const collection = document.body.getElementsByTagName('style');
+  for (let i = 0; i < collection.length; ++i) {
+    upgrade(collection[i]);
+  }
+}
\ No newline at end of file
diff --git a/src/polyfill.js b/src/polyfill.js
new file mode 100644
index 0000000..c837965
--- /dev/null
+++ b/src/polyfill.js
@@ -0,0 +1,29 @@
+/*
+ * Copyright 2017 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+/**
+ * @fileoverview Polyfill for `<style scoped>`.
+ */
+
+import { setup } from './index';
+
+console.log("scoped");
+
+if (document.readyState === 'loading') {
+  window.addEventListener('DOMContentLoaded', setup);
+} else {
+  setup();
+}
\ No newline at end of file
diff --git a/src/regex.js b/src/regex.js
new file mode 100644
index 0000000..69534cb
--- /dev/null
+++ b/src/regex.js
@@ -0,0 +1,6 @@
+// This monstrosity matches any valid `[foo="bar"]` block, with either quote style. Parenthesis
+// have no special meaning within an attribute selector, and the complex regexp below mostly
+// exists to allow \" or \' in string parts (e.g. `[foo="b\"ar"]`).
+export const attrRe = /^\[.*?(?:(["'])(?:.|\\\1)*\1.*)*\]/;
+export const walkSelectorRe = /([([,]|:scope\b)/;  // "interesting" setups
+export const scopeRe = /^:scope\b/;
\ No newline at end of file
diff --git a/test.js b/test.js
index c54b0ab..06ed774 100644
--- a/test.js
+++ b/test.js
@@ -14,7 +14,7 @@
  * the License.
  */
 
-import './scoped.js';
+import './dist\/scoped.js';
 
 suite('scoped', function() {
 

From 3ed06aa9ce80cbd1aa7955b43ff894577d80e963 Mon Sep 17 00:00:00 2001
From: Chess Luo <chess@luo.sh>
Date: Sun, 3 Apr 2022 14:03:02 +0800
Subject: [PATCH 2/7] clean up

---
 src/polyfill.js | 2 --
 1 file changed, 2 deletions(-)

diff --git a/src/polyfill.js b/src/polyfill.js
index c837965..4bb89e4 100644
--- a/src/polyfill.js
+++ b/src/polyfill.js
@@ -20,8 +20,6 @@
 
 import { setup } from './index';
 
-console.log("scoped");
-
 if (document.readyState === 'loading') {
   window.addEventListener('DOMContentLoaded', setup);
 } else {

From 6c96bfa81efc4f36b117218c2bd6b5f0d9a9328d Mon Sep 17 00:00:00 2001
From: Chess Luo <chess@luo.sh>
Date: Sun, 3 Apr 2022 14:17:19 +0800
Subject: [PATCH 3/7] add prepare script

---
 dist/scoped.js     | 2 --
 dist/scoped.min.js | 2 +-
 lib/polyfill.js    | 2 --
 package.json       | 3 ++-
 4 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/dist/scoped.js b/dist/scoped.js
index ba9434e..a0abd20 100644
--- a/dist/scoped.js
+++ b/dist/scoped.js
@@ -532,8 +532,6 @@
    * the License.
    */
 
-  console.log("scoped");
-
   if (document.readyState === 'loading') {
     window.addEventListener('DOMContentLoaded', setup);
   } else {
diff --git a/dist/scoped.min.js b/dist/scoped.min.js
index cbf9bce..77209c0 100644
--- a/dist/scoped.min.js
+++ b/dist/scoped.min.js
@@ -1 +1 @@
-!function(e){"function"==typeof define&&define.amd?define(e):e()}(function(){"use strict";const a=/^\[.*?(?:(["'])(?:.|\\\1)*\1.*)*\]/,l=/([([,]|:scope\b)/,u=/^:scope\b/,e=document.createElement("style"),f=(e.textContent=".x{color:red;}",document.head.appendChild(e),(e.sheet.cssRules[0].selectorText=".change")===e.sheet.cssRules[0].selectorText),o=(document.head.removeChild(e),{applyToClass:!1,prefix:"__scoped_"}),c=(Object.defineProperty(HTMLStyleElement.prototype,"scoped",{enumerable:!0,get(){return this.hasAttribute("scoped")},set(e){e?this.setAttribute("scoped",this.getAttribute("scoped")||""):this.removeAttribute("scoped")}}),new Map);function p(e,t){const n=[];for(;e;){var s=function(e,t){let n=e.search(l);if(-1===n)return{selector:t+" "+e,rest:""};if(","===e[n])return{selector:t+" "+e.substr(0,n),rest:e.substr(n+1)};let s=!0,r=!1,o=(n=e.search(/\S/),0);e:for(;n<e.length;++n){var c=e[n];switch(c){case"[":var i=a.exec(e.substr(n));n+=(i?i[0].length:1)-1;continue;case"(":++o;continue;case":":if(!s)continue;if(!u.test(e.substr(n)))continue;if(o)return null;e=e.substring(0,n)+t+e.substr(n+6),n+=t.length,r=!0,--n;continue;case")":o&&--o;continue}if(!o)switch(c){case",":break e;case" ":case">":case"~":case"+":if(!s)continue;s=!1}}return{selector:(r?"":t+" ")+e.substr(0,n),rest:e.substr(n+1)}}(e,t);if(null===s)return":not(*)";n.push(s.selector),e=s.rest}return n.join(", ")}function h(e,t){const n=e.parentStyleSheet;let s;for(s=0;s<n.rules.length&&n.rules[s]!==e;++s);return n.removeRule(s),n.insertRule(t,s),n.rules[s]}function m(e){let t=null;try{t=e.cssRules}catch(e){if(e instanceof DOMException)return e;throw e}return t?null:{code:DOMException.SECURITY_ERR}}const i=function(){const i=new WeakMap,a=new Map,l=new Map,u=function(){let e=0;function t(){let n=!1;e=0,a.forEach((e,t)=>{if(t.styleSheet)d(t.styleSheet,e);else if(function(e){let t=e.parentStyleSheet;for(;t;){if(t.ownerNode)return t.ownerNode;t=t.parentStyleSheet}}(t))return void(n=!0);a.delete(t)}),l.forEach((e,t)=>{m(t)?n=!0:(d(t,e),l.delete(t))}),n&&(e=window.requestAnimationFrame(t))}return function(){e=e||window.requestAnimationFrame(t)}}();function d(t,n){if(i.get(t)!==n){var e=m(t);if(e)switch(e.code){case DOMException.SECURITY_ERR:const o=new XMLHttpRequest,c=(o.responseType="blob",o.open("GET",t.href),h(t.ownerRule,"@import url('data:text/css;base64,')"));return o.onload=()=>{var e=URL.createObjectURL(o.response),t=h(c,`@import '${e}'`);a.set(t,n),u(),URL.revokeObjectURL(e)},void o.send();case DOMException.INVALID_ACCESS_ERR:return l.set(t,n),void u();default:throw e}i.set(t,n);var s=t.cssRules.length;for(let e=0;e<s;++e){var r=t.cssRules[e];r instanceof CSSImportRule?r.styleSheet?d(r.styleSheet,n):(a.set(r,n),u()):function t(n,s,e,r){if(n instanceof CSSMediaRule){var o=n.cssRules.length;for(let e=0;e<o;++e)t(n.cssRules[e],s,n,e)}else{var c,i;n instanceof CSSStyleRule&&(c=p(n.selectorText,s),f?n.selectorText=c:(i=n.style.cssText,e.deleteRule(r),e.insertRule(c+` {${i}}`,r)))}}(r,n,t,e)}return!0}}return d}();function d(e,t,n){n?e.setAttribute(t,""):e.removeAttribute(t)}function s(e,t,n){n?e.classList.add(t):e.classList.remove(t)}let b=d,S=0;function y(e){var t,n,s=e.scoped&&document.body.contains(e)?e.parentNode:null;const r=c.get(e);if(r)return s?e.sheet&&i(e.sheet,r.prefix):(c.delete(e),n=(t=e).textContent,t.textContent="",t.textContent=n),r.parent!==s&&(r.parent&&b(r.parent,r.attrName,!1),s&&b(s,r.attrName,!0),r.parent=s),!1;s&&(t=""+o.prefix+ ++S,n=b===d?`[${t}]`:"."+t,c.set(e,{attrName:t,prefix:n,parent:e.parentNode}),i(e.sheet,n),b(s,t,!0))}const r=new MutationObserver(e=>{const r=new Set,t=e=>{let t=e?e.length:0;for(;t;){const s=e[--t];if(s instanceof HTMLElement)if(s instanceof HTMLStyleElement)r.add(s);else{var n=s.getElementsByTagName("style");let e=n.length;for(;e;)r.add(n[--e])}}};e.forEach(e=>{e.target instanceof HTMLStyleElement?r.add(e.target):(t(e.addedNodes),t(e.removedNodes))}),r.forEach(y)});function t(){var e=window.scopedCSS;if("object"==typeof e){for(var t in o)t in e&&(o[t]=e[t]);o.applyToClass&&(b=s)}r.observe(document,{childList:!0,subtree:!0,attributes:!0,attributeFilter:["scoped"]});var n=document.body.getElementsByTagName("style");for(let e=0;e<n.length;++e)y(n[e])}console.log("scoped"),"loading"===document.readyState?window.addEventListener("DOMContentLoaded",t):t()});
+!function(e){"function"==typeof define&&define.amd?define(e):e()}(function(){"use strict";const a=/^\[.*?(?:(["'])(?:.|\\\1)*\1.*)*\]/,l=/([([,]|:scope\b)/,u=/^:scope\b/,e=document.createElement("style"),f=(e.textContent=".x{color:red;}",document.head.appendChild(e),(e.sheet.cssRules[0].selectorText=".change")===e.sheet.cssRules[0].selectorText),o=(document.head.removeChild(e),{applyToClass:!1,prefix:"__scoped_"}),c=(Object.defineProperty(HTMLStyleElement.prototype,"scoped",{enumerable:!0,get(){return this.hasAttribute("scoped")},set(e){e?this.setAttribute("scoped",this.getAttribute("scoped")||""):this.removeAttribute("scoped")}}),new Map);function p(e,t){const n=[];for(;e;){var s=function(e,t){let n=e.search(l);if(-1===n)return{selector:t+" "+e,rest:""};if(","===e[n])return{selector:t+" "+e.substr(0,n),rest:e.substr(n+1)};let s=!0,r=!1,o=(n=e.search(/\S/),0);e:for(;n<e.length;++n){var c=e[n];switch(c){case"[":var i=a.exec(e.substr(n));n+=(i?i[0].length:1)-1;continue;case"(":++o;continue;case":":if(!s)continue;if(!u.test(e.substr(n)))continue;if(o)return null;e=e.substring(0,n)+t+e.substr(n+6),n+=t.length,r=!0,--n;continue;case")":o&&--o;continue}if(!o)switch(c){case",":break e;case" ":case">":case"~":case"+":if(!s)continue;s=!1}}return{selector:(r?"":t+" ")+e.substr(0,n),rest:e.substr(n+1)}}(e,t);if(null===s)return":not(*)";n.push(s.selector),e=s.rest}return n.join(", ")}function h(e,t){const n=e.parentStyleSheet;let s;for(s=0;s<n.rules.length&&n.rules[s]!==e;++s);return n.removeRule(s),n.insertRule(t,s),n.rules[s]}function m(e){let t=null;try{t=e.cssRules}catch(e){if(e instanceof DOMException)return e;throw e}return t?null:{code:DOMException.SECURITY_ERR}}const i=function(){const i=new WeakMap,a=new Map,l=new Map,u=function(){let e=0;function t(){let n=!1;e=0,a.forEach((e,t)=>{if(t.styleSheet)d(t.styleSheet,e);else if(function(e){let t=e.parentStyleSheet;for(;t;){if(t.ownerNode)return t.ownerNode;t=t.parentStyleSheet}}(t))return void(n=!0);a.delete(t)}),l.forEach((e,t)=>{m(t)?n=!0:(d(t,e),l.delete(t))}),n&&(e=window.requestAnimationFrame(t))}return function(){e=e||window.requestAnimationFrame(t)}}();function d(t,n){if(i.get(t)!==n){var e=m(t);if(e)switch(e.code){case DOMException.SECURITY_ERR:const o=new XMLHttpRequest,c=(o.responseType="blob",o.open("GET",t.href),h(t.ownerRule,"@import url('data:text/css;base64,')"));return o.onload=()=>{var e=URL.createObjectURL(o.response),t=h(c,`@import '${e}'`);a.set(t,n),u(),URL.revokeObjectURL(e)},void o.send();case DOMException.INVALID_ACCESS_ERR:return l.set(t,n),void u();default:throw e}i.set(t,n);var s=t.cssRules.length;for(let e=0;e<s;++e){var r=t.cssRules[e];r instanceof CSSImportRule?r.styleSheet?d(r.styleSheet,n):(a.set(r,n),u()):function t(n,s,e,r){if(n instanceof CSSMediaRule){var o=n.cssRules.length;for(let e=0;e<o;++e)t(n.cssRules[e],s,n,e)}else{var c,i;n instanceof CSSStyleRule&&(c=p(n.selectorText,s),f?n.selectorText=c:(i=n.style.cssText,e.deleteRule(r),e.insertRule(c+` {${i}}`,r)))}}(r,n,t,e)}return!0}}return d}();function d(e,t,n){n?e.setAttribute(t,""):e.removeAttribute(t)}function s(e,t,n){n?e.classList.add(t):e.classList.remove(t)}let b=d,S=0;function y(e){var t,n,s=e.scoped&&document.body.contains(e)?e.parentNode:null;const r=c.get(e);if(r)return s?e.sheet&&i(e.sheet,r.prefix):(c.delete(e),n=(t=e).textContent,t.textContent="",t.textContent=n),r.parent!==s&&(r.parent&&b(r.parent,r.attrName,!1),s&&b(s,r.attrName,!0),r.parent=s),!1;s&&(t=""+o.prefix+ ++S,n=b===d?`[${t}]`:"."+t,c.set(e,{attrName:t,prefix:n,parent:e.parentNode}),i(e.sheet,n),b(s,t,!0))}const r=new MutationObserver(e=>{const r=new Set,t=e=>{let t=e?e.length:0;for(;t;){const s=e[--t];if(s instanceof HTMLElement)if(s instanceof HTMLStyleElement)r.add(s);else{var n=s.getElementsByTagName("style");let e=n.length;for(;e;)r.add(n[--e])}}};e.forEach(e=>{e.target instanceof HTMLStyleElement?r.add(e.target):(t(e.addedNodes),t(e.removedNodes))}),r.forEach(y)});function t(){var e=window.scopedCSS;if("object"==typeof e){for(var t in o)t in e&&(o[t]=e[t]);o.applyToClass&&(b=s)}r.observe(document,{childList:!0,subtree:!0,attributes:!0,attributeFilter:["scoped"]});var n=document.body.getElementsByTagName("style");for(let e=0;e<n.length;++e)y(n[e])}"loading"===document.readyState?window.addEventListener("DOMContentLoaded",t):t()});
diff --git a/lib/polyfill.js b/lib/polyfill.js
index 7628b17..364566f 100644
--- a/lib/polyfill.js
+++ b/lib/polyfill.js
@@ -529,8 +529,6 @@ function setup() {
  * the License.
  */
 
-console.log("scoped");
-
 if (document.readyState === 'loading') {
   window.addEventListener('DOMContentLoaded', setup);
 } else {
diff --git a/package.json b/package.json
index 6365917..2aa6910 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,8 @@
     "build:cjs": "rollup -i src/index.js -o lib/index.js -f cjs",
     "build:cjs-polyfill": "rollup -i src/polyfill.js -o lib/polyfill.js -f cjs",
     "build:umd-polyfill": "cross-env NODE_ENV=development rollup -i src/polyfill.js -o dist/scoped.js -c rollup.umd.config.js",
-    "build:umd-polyfill:min": "cross-env NODE_ENV=production rollup -i src/polyfill.js -o dist/scoped.min.js -c rollup.umd.config.js"
+    "build:umd-polyfill:min": "cross-env NODE_ENV=production rollup -i src/polyfill.js -o dist/scoped.min.js -c rollup.umd.config.js",
+    "prepare": "npm run build"
   },
   "devDependencies": {
     "cross-env": "^7.0.3",

From 8b1e27c2e0067d5647ebf3b49baec70a8a70b326 Mon Sep 17 00:00:00 2001
From: Chess Luo <chess@luo.sh>
Date: Wed, 6 Apr 2022 00:18:21 +0800
Subject: [PATCH 4/7] removes dist and lib

---
 .gitignore         |   2 +
 dist/scoped.js     | 541 ---------------------------------------------
 dist/scoped.min.js |   1 -
 lib/index.js       | 518 -------------------------------------------
 lib/polyfill.js    | 536 --------------------------------------------
 5 files changed, 2 insertions(+), 1596 deletions(-)
 delete mode 100644 dist/scoped.js
 delete mode 100644 dist/scoped.min.js
 delete mode 100644 lib/index.js
 delete mode 100644 lib/polyfill.js

diff --git a/.gitignore b/.gitignore
index 9daa824..f82203c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
 .DS_Store
 node_modules
+lib/
+dist/
\ No newline at end of file
diff --git a/dist/scoped.js b/dist/scoped.js
deleted file mode 100644
index a0abd20..0000000
--- a/dist/scoped.js
+++ /dev/null
@@ -1,541 +0,0 @@
-(function (factory) {
-  typeof define === 'function' && define.amd ? define(factory) :
-  factory();
-}((function () { 'use strict';
-
-  // This monstrosity matches any valid `[foo="bar"]` block, with either quote style. Parenthesis
-  // have no special meaning within an attribute selector, and the complex regexp below mostly
-  // exists to allow \" or \' in string parts (e.g. `[foo="b\"ar"]`).
-  const attrRe = /^\[.*?(?:(["'])(?:.|\\\1)*\1.*)*\]/;
-  const walkSelectorRe = /([([,]|:scope\b)/;  // "interesting" setups
-  const scopeRe = /^:scope\b/;
-
-  const s = document.createElement('style');
-  // are we in old IE/Firefox mode, where .selectorText can't be changed inline?
-  s.textContent = '.x{color:red;}';
-  document.head.appendChild(s);
-  s.sheet.cssRules[0].selectorText = '.change';
-  const writeMode = s.sheet.cssRules[0].selectorText === '.change';
-  document.head.removeChild(s);
-
-  const scopedCSSOptions = {
-    'applyToClass': false,
-    'prefix': '__scoped_',
-  };
-
-  Object.defineProperty(HTMLStyleElement.prototype, 'scoped', {
-    enumerable: true,
-    get() {
-      return this.hasAttribute('scoped');
-    },
-    set(v) {
-      if (v) {
-        this.setAttribute('scoped', this.getAttribute('scoped') || '');
-      } else {
-        this.removeAttribute('scoped');
-      }
-    },
-  });
-
-  /**
-   * @type {!Map<!HTMLStyleElement, {attrName: string, prefix: string, parent: !HTMLElement}>}
-   */
-  const styleNodes = new Map();
-
-  /**
-   * Consumes a single selector from candidate selector text, which may contain many.
-   *
-   * @param {string} raw selector text
-   * @return {?{selector: string, rest: string}}
-   */
-  function consumeSelector(raw, prefix) {
-    let i = raw.search(walkSelectorRe);
-    if (i === -1) {
-      // found literally nothing interesting, success
-      return {
-        selector: `${prefix} ${raw}`,
-        rest: '',
-      };
-    } else if (raw[i] === ',') {
-      // found comma without anything interesting, yield rest
-      return {
-        selector: `${prefix} ${raw.substr(0, i)}`,
-        rest: raw.substr(i + 1),
-      }
-    }
-
-    let leftmost = true;   // whether we're past a descendant or similar selector
-    let scope = false;     // whether :scope has been found + replaced
-    i = raw.search(/\S/);  // place i after initial whitespace only
-
-    let depth = 0;
-  outer:
-    for (; i < raw.length; ++i) {
-      const char = raw[i];
-      switch (char) {
-        case '[':
-          const match = attrRe.exec(raw.substr(i));
-          i += (match ? match[0].length : 1) - 1;  // we add 1 every loop
-          continue;
-
-        case '(':
-          ++depth;
-          continue;
-
-        case ':':
-          if (!leftmost) {
-            continue;  // doesn't matter if :scope is here, it'll always be ignored
-          } else if (!scopeRe.test(raw.substr(i))) {
-            continue;  // not ':scope', ignore
-          } else if (depth) {
-            return null;
-          }
-
-          // Replace ':scope' with our prefix. This can happen many times; ':scope:scope' is valid.
-          // It will never apply to a descendant selector (e.g., ".foo :scope") as this is ignored
-          // by browsers anyway (invalid).
-          raw = raw.substring(0, i) + prefix + raw.substr(i + 6);
-          i += prefix.length;
-          scope = true;
-          --i;  // we'd skip over next character otherwise
-          continue;  // run loop again
-
-        case ')':
-          if (depth) {
-            --depth;
-          }
-          continue;
-      }
-      if (depth) {
-        continue;
-      }
-
-      switch (char) {
-        case ',':
-          break outer;
-
-        case ' ':
-        case '>':
-        case '~':
-        case '+':
-          if (!leftmost) {
-            continue;
-          }
-          leftmost = false;
-      }
-    }
-
-    const selector = (scope ? '' : `${prefix} `) + raw.substr(0, i);
-    return {selector, rest: raw.substr(i + 1)};
-  }
-
-  function updateSelectorText(selectorText, prefix) {
-    const found = [];
-
-    while (selectorText) {
-      const consumed = consumeSelector(selectorText, prefix);
-      if (consumed === null) {
-        return ':not(*)';
-      }
-      found.push(consumed.selector);
-      selectorText = consumed.rest;
-    }
-
-    return found.join(', ');
-  }
-
-
-  /**
-   * Upgrades a specific CSSRule.
-   *
-   * @param {!CSSRule} rule
-   * @param {string} prefix to apply
-   * @param {!CSSMediaRule|!CSSStyleSheet} group
-   * @param {number} index in group
-   */
-  function upgradeRule(rule, prefix, group, index) {
-    if (rule instanceof CSSMediaRule) {
-      // upgrade children
-      const l = rule.cssRules.length;
-      for (let j = 0; j < l; ++j) {
-        upgradeRule(rule.cssRules[j], prefix, rule, j);
-      }
-      return;
-    }
-
-    if (!(rule instanceof CSSStyleRule)) {
-      return;  // unknown rule type, ignore
-    }
-
-    const update = updateSelectorText(rule.selectorText, prefix);
-
-    if (writeMode) {
-      // anything but old IE/Firefox
-      rule.selectorText = update;
-    } else {
-      // old browsers which don't allow modification of selectorText
-      const cssText = rule.style.cssText;  // save before we delete
-      group.deleteRule(index);
-      group.insertRule(`${update} {${cssText}}`, index);
-    }
-  }
-
-
-  /**
-   * @param {!CSSRule} rule
-   * @return {Node} owner of rule
-   */
-  function ownerNode(rule) {
-    let sheet = rule.parentStyleSheet;
-    while (sheet) {
-      if (sheet.ownerNode) {
-        return sheet.ownerNode;
-      }
-      sheet = sheet.parentStyleSheet;
-    }
-    return null;
-  }
-
-
-  /**
-   * Replaces a live rule, returning the new `CSSRule` that it was replaced with.
-   *
-   * @param {!CSSRule} rule
-   * @param {string} update to replace with
-   * @return {!CSSRule}
-   */
-  function replaceRule(rule, update) {
-    const parent = rule.parentStyleSheet;
-    let i;
-    for (i = 0; i < parent.rules.length; ++i) {
-      if (parent.rules[i] === rule) {
-        break;
-      }
-    }
-    parent.removeRule(i);
-    parent.insertRule(update, i);
-
-    return parent.rules[i];
-  }
-
-
-  /**
-   * @param {!CSSStyleSheet} sheet
-   * @return {?{code: number}} the DOMException found while accessing this CSS
-   */
-  function sheetRulesError(sheet) {
-    // FIXME: This monstrosity just convinces Closure that `sheet.cssRules` has side-effects.
-    let rules = null;
-    try {
-      rules = sheet.cssRules;
-    } catch (e) {
-      if (e instanceof DOMException) {
-        return e;
-      }
-      throw e;
-    }
-    if (rules) {
-      return null;
-    }
-
-    // Safari no longer throws an error here, just pretend we can't read the data.
-    return {code: DOMException.SECURITY_ERR};
-  }
-
-  // TODO: upgradeSheet could return a Promise or then-like
-
-  /**
-   * @param {!CSSStyleSheet} sheet already loaded CSSStyleSheet
-   * @param {string} prefix to apply
-   * @return {boolean} if applied immediately
-   */
-  const upgradeSheet = (function() {
-
-    /** @type {!WeakMap<!StyleSheet, string>} */
-    const upgradedSheets = new WeakMap();
-
-    /** @type {!Map<!CSSImportRule, string>} */
-    const pendingImportRule = new Map();
-
-    /** @type {!Map<!CSSStyleSheet, string>} */
-    const pendingInvalidSheet = new Map();
-
-    /**
-     * Callback inside rAF to monitor for @import-style loading or for parsing CSS script tags.
-     * This is ugly, but only happens on styles that are moved or inserted dynamically (static
-     * styles all fire at once).
-     */
-    const requestCheck = (function() {
-      let rAF = 0;
-
-      function check() {
-        let again = false;
-        rAF = 0;
-
-        pendingImportRule.forEach((prefix, importRule) => {
-          if (importRule.styleSheet) {
-            internalUpgrade(importRule.styleSheet, prefix);
-          } else if (ownerNode(importRule)) {
-            again = true;
-            return;  // still valid, do nothing
-          }
-          pendingImportRule.delete(importRule);
-        });
-
-        pendingInvalidSheet.forEach((prefix, sheet) => {
-          if (sheetRulesError(sheet)) {
-            again = true;
-            return;
-          }
-          internalUpgrade(sheet, prefix);
-          pendingInvalidSheet.delete(sheet);
-        });
-
-        // check again next frame
-        if (again) {
-          rAF = window.requestAnimationFrame(check);
-        }
-      }
-
-      return function() {
-        rAF = rAF || window.requestAnimationFrame(check);
-      };
-    }());
-
-    /**
-     * @param {!CSSStyleSheet} sheet
-     * @param {string} prefix
-     */
-    function internalUpgrade(sheet, prefix) {
-      if (upgradedSheets.get(sheet) === prefix) {
-        return;  // already done
-      }
-
-      const e = sheetRulesError(sheet);
-      if (e) {
-        switch (e.code) {
-          case DOMException.SECURITY_ERR:
-            // Occurs if we try to examine a cross-domain CSS file. Fetch it ourselves and update
-            // the CSS once it is available on a 'local' URL.
-            const x = new XMLHttpRequest();
-            x.responseType = 'blob';
-            x.open('GET', sheet.href);
-
-            // This must also be replaced with a temporary @import, as @import must all appear
-            // first. Use a base64 URL that doesn't actually contain anything.
-            const rule = replaceRule(
-                /** @type {!CSSRule} */ (sheet.ownerRule),
-                `@import url('data:text/css;base64,')`
-            );
-
-            x.onload = () => {
-              const url = URL.createObjectURL(/** @type {!Blob} */ (x.response));
-              const update = /** @type {!CSSImportRule} */ (replaceRule(rule, `@import '${url}'`));
-              pendingImportRule.set(update, prefix);
-              requestCheck();
-
-              // We can revoke this URL immediately as it's seemingly read synchronously.
-              URL.revokeObjectURL(url);
-            };
-            // nb. no onerror handling
-
-            x.send();
-            return;
-
-          case DOMException.INVALID_ACCESS_ERR:
-            // This occurs in Firefox if the CSS is yet to be parsed (for dynamic cases), see:
-            //   https://bugzilla.mozilla.org/show_bug.cgi?id=761236
-            pendingInvalidSheet.set(sheet, prefix);
-            requestCheck();
-            return;
-
-          default:
-            throw e;
-        }
-      }
-
-      // Hooray, the sheet is ready to go!
-      upgradedSheets.set(sheet, prefix);
-
-      const l = sheet.cssRules.length;
-      for (let i = 0; i < l; ++i) {
-        const rule = sheet.cssRules[i];
-
-        if (!(rule instanceof CSSImportRule)) {
-          upgradeRule(rule, prefix, sheet, i);
-          continue;
-        }
-
-        if (rule.styleSheet) {
-          // TODO: recursion is bad
-          internalUpgrade(rule.styleSheet, prefix);
-          continue;
-        }
-
-        // otherwise, add to pending queue
-        pendingImportRule.set(rule, prefix);
-        requestCheck();
-      }
-
-      return true;
-    }
-
-    return internalUpgrade;
-  }());
-
-
-  /**
-   * @param {!HTMLStyleElement} node to reset
-   */
-  function resetCSS(node) {
-    const css = node.textContent;
-    node.textContent = '';
-    node.textContent = css;
-  }
-
-
-  function applyToAttr(node, attrName, apply) {
-    // default version is to apply to attributes
-    if (apply) {
-      node.setAttribute(attrName, '');
-    } else {
-      node.removeAttribute(attrName);
-    }
-  }
-
-  function applyToClass(node, attrName, apply) {
-    if (apply) {
-      node.classList.add(attrName);
-    } else {
-      node.classList.remove(attrName);
-    }
-  }
-
-
-  let applyMode = applyToAttr;
-  let uniqueId = 0;
-
-
-  function upgrade(node) {
-    const effectiveParent = node['scoped'] && document.body.contains(node) ? node.parentNode : null;
-
-    const state = styleNodes.get(node);
-    if (state) {
-      if (!effectiveParent) {
-        // disappearing, clear state and ask browser to reset CSS
-        styleNodes.delete(node);
-        resetCSS(node);
-      } else if (node.sheet) {
-        // otherwise, upgrade the sheet (succeeds if already done)
-        // nb. node.sheet is null if being removed
-        upgradeSheet(node.sheet, state.prefix);
-      }
-
-      if (state.parent !== effectiveParent) {
-        state.parent && applyMode(state.parent, state.attrName, false);
-        effectiveParent && applyMode(effectiveParent, state.attrName, true);
-        state.parent = effectiveParent;
-      }
-
-      return false;  // already upgraded
-    }
-
-    if (!effectiveParent) {
-      return;  // not scoped CSS, never seen before, ignore
-    }
-
-    // TODO: use hash for deduping
-    // const hash = hashCode(node.textContent);
-
-    // newly found style node, setup attr
-    const attrName = `${scopedCSSOptions['prefix']}${++uniqueId}`;
-    const prefix = applyMode === applyToAttr ? `[${attrName}]` : `.${attrName}`;
-    styleNodes.set(node, {attrName, prefix, parent: node.parentNode});
-
-    upgradeSheet(node.sheet, prefix);
-    applyMode(effectiveParent, attrName, true);
-  }
-
-  // this mess basically calls resolve() with any <style> nodes that changed/removed/added
-  // TODO: is it faster to just call getElementsByTagName('style') and compare to previous
-  const mo = new MutationObserver((records) => {
-    const changes = new Set();
-    const iterate = (nodes) => {
-      let i = nodes ? nodes.length : 0;
-      while (i) {
-        const node = nodes[--i];
-        if (!(node instanceof HTMLElement)) {
-          continue;  // text node
-        }
-        if (node instanceof HTMLStyleElement) {
-          changes.add(node);  // directly a <style>
-          continue;
-        }
-        // look for changed children
-        const cand = node.getElementsByTagName('style');
-        let j = cand.length;
-        while (j) {
-          changes.add(cand[--j]);
-        }
-      }
-    };
-
-    records.forEach((record) => {
-      if (record.target instanceof HTMLStyleElement) {
-        changes.add(record.target);
-      } else {
-        iterate(record.addedNodes);
-        iterate(record.removedNodes);
-      }
-    });
-
-    changes.forEach(upgrade);
-  });
-
-  function setup() {
-    // clone any options from global
-    const cand = window['scopedCSS'];
-    if (typeof cand === 'object') {
-      for (let k in scopedCSSOptions) {
-        if (k in cand) {
-          scopedCSSOptions[k] = cand[k];
-        }
-      }
-
-      if (scopedCSSOptions['applyToClass']) {
-        applyMode = applyToClass;
-      }
-    }
-
-    // nb. watch for attributeFilter: ['scoped'] to detect a CSS rule changing at runtime
-    const options = {childList: true, subtree: true, attributes: true, attributeFilter: ['scoped']};
-    mo.observe(document, options);
-    const collection = document.body.getElementsByTagName('style');
-    for (let i = 0; i < collection.length; ++i) {
-      upgrade(collection[i]);
-    }
-  }
-
-  /*
-   * Copyright 2017 Google Inc. All rights reserved.
-   *
-   * Licensed under the Apache License, Version 2.0 (the "License"); you may not
-   * use this file except in compliance with the License. You may obtain a copy of
-   * the License at
-   *
-   *     http://www.apache.org/licenses/LICENSE-2.0
-   *
-   * Unless required by applicable law or agreed to in writing, software
-   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-   * License for the specific language governing permissions and limitations under
-   * the License.
-   */
-
-  if (document.readyState === 'loading') {
-    window.addEventListener('DOMContentLoaded', setup);
-  } else {
-    setup();
-  }
-
-})));
diff --git a/dist/scoped.min.js b/dist/scoped.min.js
deleted file mode 100644
index 77209c0..0000000
--- a/dist/scoped.min.js
+++ /dev/null
@@ -1 +0,0 @@
-!function(e){"function"==typeof define&&define.amd?define(e):e()}(function(){"use strict";const a=/^\[.*?(?:(["'])(?:.|\\\1)*\1.*)*\]/,l=/([([,]|:scope\b)/,u=/^:scope\b/,e=document.createElement("style"),f=(e.textContent=".x{color:red;}",document.head.appendChild(e),(e.sheet.cssRules[0].selectorText=".change")===e.sheet.cssRules[0].selectorText),o=(document.head.removeChild(e),{applyToClass:!1,prefix:"__scoped_"}),c=(Object.defineProperty(HTMLStyleElement.prototype,"scoped",{enumerable:!0,get(){return this.hasAttribute("scoped")},set(e){e?this.setAttribute("scoped",this.getAttribute("scoped")||""):this.removeAttribute("scoped")}}),new Map);function p(e,t){const n=[];for(;e;){var s=function(e,t){let n=e.search(l);if(-1===n)return{selector:t+" "+e,rest:""};if(","===e[n])return{selector:t+" "+e.substr(0,n),rest:e.substr(n+1)};let s=!0,r=!1,o=(n=e.search(/\S/),0);e:for(;n<e.length;++n){var c=e[n];switch(c){case"[":var i=a.exec(e.substr(n));n+=(i?i[0].length:1)-1;continue;case"(":++o;continue;case":":if(!s)continue;if(!u.test(e.substr(n)))continue;if(o)return null;e=e.substring(0,n)+t+e.substr(n+6),n+=t.length,r=!0,--n;continue;case")":o&&--o;continue}if(!o)switch(c){case",":break e;case" ":case">":case"~":case"+":if(!s)continue;s=!1}}return{selector:(r?"":t+" ")+e.substr(0,n),rest:e.substr(n+1)}}(e,t);if(null===s)return":not(*)";n.push(s.selector),e=s.rest}return n.join(", ")}function h(e,t){const n=e.parentStyleSheet;let s;for(s=0;s<n.rules.length&&n.rules[s]!==e;++s);return n.removeRule(s),n.insertRule(t,s),n.rules[s]}function m(e){let t=null;try{t=e.cssRules}catch(e){if(e instanceof DOMException)return e;throw e}return t?null:{code:DOMException.SECURITY_ERR}}const i=function(){const i=new WeakMap,a=new Map,l=new Map,u=function(){let e=0;function t(){let n=!1;e=0,a.forEach((e,t)=>{if(t.styleSheet)d(t.styleSheet,e);else if(function(e){let t=e.parentStyleSheet;for(;t;){if(t.ownerNode)return t.ownerNode;t=t.parentStyleSheet}}(t))return void(n=!0);a.delete(t)}),l.forEach((e,t)=>{m(t)?n=!0:(d(t,e),l.delete(t))}),n&&(e=window.requestAnimationFrame(t))}return function(){e=e||window.requestAnimationFrame(t)}}();function d(t,n){if(i.get(t)!==n){var e=m(t);if(e)switch(e.code){case DOMException.SECURITY_ERR:const o=new XMLHttpRequest,c=(o.responseType="blob",o.open("GET",t.href),h(t.ownerRule,"@import url('data:text/css;base64,')"));return o.onload=()=>{var e=URL.createObjectURL(o.response),t=h(c,`@import '${e}'`);a.set(t,n),u(),URL.revokeObjectURL(e)},void o.send();case DOMException.INVALID_ACCESS_ERR:return l.set(t,n),void u();default:throw e}i.set(t,n);var s=t.cssRules.length;for(let e=0;e<s;++e){var r=t.cssRules[e];r instanceof CSSImportRule?r.styleSheet?d(r.styleSheet,n):(a.set(r,n),u()):function t(n,s,e,r){if(n instanceof CSSMediaRule){var o=n.cssRules.length;for(let e=0;e<o;++e)t(n.cssRules[e],s,n,e)}else{var c,i;n instanceof CSSStyleRule&&(c=p(n.selectorText,s),f?n.selectorText=c:(i=n.style.cssText,e.deleteRule(r),e.insertRule(c+` {${i}}`,r)))}}(r,n,t,e)}return!0}}return d}();function d(e,t,n){n?e.setAttribute(t,""):e.removeAttribute(t)}function s(e,t,n){n?e.classList.add(t):e.classList.remove(t)}let b=d,S=0;function y(e){var t,n,s=e.scoped&&document.body.contains(e)?e.parentNode:null;const r=c.get(e);if(r)return s?e.sheet&&i(e.sheet,r.prefix):(c.delete(e),n=(t=e).textContent,t.textContent="",t.textContent=n),r.parent!==s&&(r.parent&&b(r.parent,r.attrName,!1),s&&b(s,r.attrName,!0),r.parent=s),!1;s&&(t=""+o.prefix+ ++S,n=b===d?`[${t}]`:"."+t,c.set(e,{attrName:t,prefix:n,parent:e.parentNode}),i(e.sheet,n),b(s,t,!0))}const r=new MutationObserver(e=>{const r=new Set,t=e=>{let t=e?e.length:0;for(;t;){const s=e[--t];if(s instanceof HTMLElement)if(s instanceof HTMLStyleElement)r.add(s);else{var n=s.getElementsByTagName("style");let e=n.length;for(;e;)r.add(n[--e])}}};e.forEach(e=>{e.target instanceof HTMLStyleElement?r.add(e.target):(t(e.addedNodes),t(e.removedNodes))}),r.forEach(y)});function t(){var e=window.scopedCSS;if("object"==typeof e){for(var t in o)t in e&&(o[t]=e[t]);o.applyToClass&&(b=s)}r.observe(document,{childList:!0,subtree:!0,attributes:!0,attributeFilter:["scoped"]});var n=document.body.getElementsByTagName("style");for(let e=0;e<n.length;++e)y(n[e])}"loading"===document.readyState?window.addEventListener("DOMContentLoaded",t):t()});
diff --git a/lib/index.js b/lib/index.js
deleted file mode 100644
index 0052b0f..0000000
--- a/lib/index.js
+++ /dev/null
@@ -1,518 +0,0 @@
-'use strict';
-
-Object.defineProperty(exports, '__esModule', { value: true });
-
-// This monstrosity matches any valid `[foo="bar"]` block, with either quote style. Parenthesis
-// have no special meaning within an attribute selector, and the complex regexp below mostly
-// exists to allow \" or \' in string parts (e.g. `[foo="b\"ar"]`).
-const attrRe = /^\[.*?(?:(["'])(?:.|\\\1)*\1.*)*\]/;
-const walkSelectorRe = /([([,]|:scope\b)/;  // "interesting" setups
-const scopeRe = /^:scope\b/;
-
-const s = document.createElement('style');
-// are we in old IE/Firefox mode, where .selectorText can't be changed inline?
-s.textContent = '.x{color:red;}';
-document.head.appendChild(s);
-s.sheet.cssRules[0].selectorText = '.change';
-const writeMode = s.sheet.cssRules[0].selectorText === '.change';
-document.head.removeChild(s);
-
-const scopedCSSOptions = {
-  'applyToClass': false,
-  'prefix': '__scoped_',
-};
-
-Object.defineProperty(HTMLStyleElement.prototype, 'scoped', {
-  enumerable: true,
-  get() {
-    return this.hasAttribute('scoped');
-  },
-  set(v) {
-    if (v) {
-      this.setAttribute('scoped', this.getAttribute('scoped') || '');
-    } else {
-      this.removeAttribute('scoped');
-    }
-  },
-});
-
-/**
- * @type {!Map<!HTMLStyleElement, {attrName: string, prefix: string, parent: !HTMLElement}>}
- */
-const styleNodes = new Map();
-
-/**
- * Consumes a single selector from candidate selector text, which may contain many.
- *
- * @param {string} raw selector text
- * @return {?{selector: string, rest: string}}
- */
-function consumeSelector(raw, prefix) {
-  let i = raw.search(walkSelectorRe);
-  if (i === -1) {
-    // found literally nothing interesting, success
-    return {
-      selector: `${prefix} ${raw}`,
-      rest: '',
-    };
-  } else if (raw[i] === ',') {
-    // found comma without anything interesting, yield rest
-    return {
-      selector: `${prefix} ${raw.substr(0, i)}`,
-      rest: raw.substr(i + 1),
-    }
-  }
-
-  let leftmost = true;   // whether we're past a descendant or similar selector
-  let scope = false;     // whether :scope has been found + replaced
-  i = raw.search(/\S/);  // place i after initial whitespace only
-
-  let depth = 0;
-outer:
-  for (; i < raw.length; ++i) {
-    const char = raw[i];
-    switch (char) {
-      case '[':
-        const match = attrRe.exec(raw.substr(i));
-        i += (match ? match[0].length : 1) - 1;  // we add 1 every loop
-        continue;
-
-      case '(':
-        ++depth;
-        continue;
-
-      case ':':
-        if (!leftmost) {
-          continue;  // doesn't matter if :scope is here, it'll always be ignored
-        } else if (!scopeRe.test(raw.substr(i))) {
-          continue;  // not ':scope', ignore
-        } else if (depth) {
-          return null;
-        }
-
-        // Replace ':scope' with our prefix. This can happen many times; ':scope:scope' is valid.
-        // It will never apply to a descendant selector (e.g., ".foo :scope") as this is ignored
-        // by browsers anyway (invalid).
-        raw = raw.substring(0, i) + prefix + raw.substr(i + 6);
-        i += prefix.length;
-        scope = true;
-        --i;  // we'd skip over next character otherwise
-        continue;  // run loop again
-
-      case ')':
-        if (depth) {
-          --depth;
-        }
-        continue;
-    }
-    if (depth) {
-      continue;
-    }
-
-    switch (char) {
-      case ',':
-        break outer;
-
-      case ' ':
-      case '>':
-      case '~':
-      case '+':
-        if (!leftmost) {
-          continue;
-        }
-        leftmost = false;
-    }
-  }
-
-  const selector = (scope ? '' : `${prefix} `) + raw.substr(0, i);
-  return {selector, rest: raw.substr(i + 1)};
-}
-
-function updateSelectorText(selectorText, prefix) {
-  const found = [];
-
-  while (selectorText) {
-    const consumed = consumeSelector(selectorText, prefix);
-    if (consumed === null) {
-      return ':not(*)';
-    }
-    found.push(consumed.selector);
-    selectorText = consumed.rest;
-  }
-
-  return found.join(', ');
-}
-
-
-/**
- * Upgrades a specific CSSRule.
- *
- * @param {!CSSRule} rule
- * @param {string} prefix to apply
- * @param {!CSSMediaRule|!CSSStyleSheet} group
- * @param {number} index in group
- */
-function upgradeRule(rule, prefix, group, index) {
-  if (rule instanceof CSSMediaRule) {
-    // upgrade children
-    const l = rule.cssRules.length;
-    for (let j = 0; j < l; ++j) {
-      upgradeRule(rule.cssRules[j], prefix, rule, j);
-    }
-    return;
-  }
-
-  if (!(rule instanceof CSSStyleRule)) {
-    return;  // unknown rule type, ignore
-  }
-
-  const update = updateSelectorText(rule.selectorText, prefix);
-
-  if (writeMode) {
-    // anything but old IE/Firefox
-    rule.selectorText = update;
-  } else {
-    // old browsers which don't allow modification of selectorText
-    const cssText = rule.style.cssText;  // save before we delete
-    group.deleteRule(index);
-    group.insertRule(`${update} {${cssText}}`, index);
-  }
-}
-
-
-/**
- * @param {!CSSRule} rule
- * @return {Node} owner of rule
- */
-function ownerNode(rule) {
-  let sheet = rule.parentStyleSheet;
-  while (sheet) {
-    if (sheet.ownerNode) {
-      return sheet.ownerNode;
-    }
-    sheet = sheet.parentStyleSheet;
-  }
-  return null;
-}
-
-
-/**
- * Replaces a live rule, returning the new `CSSRule` that it was replaced with.
- *
- * @param {!CSSRule} rule
- * @param {string} update to replace with
- * @return {!CSSRule}
- */
-function replaceRule(rule, update) {
-  const parent = rule.parentStyleSheet;
-  let i;
-  for (i = 0; i < parent.rules.length; ++i) {
-    if (parent.rules[i] === rule) {
-      break;
-    }
-  }
-  parent.removeRule(i);
-  parent.insertRule(update, i);
-
-  return parent.rules[i];
-}
-
-
-/**
- * @param {!CSSStyleSheet} sheet
- * @return {?{code: number}} the DOMException found while accessing this CSS
- */
-function sheetRulesError(sheet) {
-  // FIXME: This monstrosity just convinces Closure that `sheet.cssRules` has side-effects.
-  let rules = null;
-  try {
-    rules = sheet.cssRules;
-  } catch (e) {
-    if (e instanceof DOMException) {
-      return e;
-    }
-    throw e;
-  }
-  if (rules) {
-    return null;
-  }
-
-  // Safari no longer throws an error here, just pretend we can't read the data.
-  return {code: DOMException.SECURITY_ERR};
-}
-
-// TODO: upgradeSheet could return a Promise or then-like
-
-/**
- * @param {!CSSStyleSheet} sheet already loaded CSSStyleSheet
- * @param {string} prefix to apply
- * @return {boolean} if applied immediately
- */
-const upgradeSheet = (function() {
-
-  /** @type {!WeakMap<!StyleSheet, string>} */
-  const upgradedSheets = new WeakMap();
-
-  /** @type {!Map<!CSSImportRule, string>} */
-  const pendingImportRule = new Map();
-
-  /** @type {!Map<!CSSStyleSheet, string>} */
-  const pendingInvalidSheet = new Map();
-
-  /**
-   * Callback inside rAF to monitor for @import-style loading or for parsing CSS script tags.
-   * This is ugly, but only happens on styles that are moved or inserted dynamically (static
-   * styles all fire at once).
-   */
-  const requestCheck = (function() {
-    let rAF = 0;
-
-    function check() {
-      let again = false;
-      rAF = 0;
-
-      pendingImportRule.forEach((prefix, importRule) => {
-        if (importRule.styleSheet) {
-          internalUpgrade(importRule.styleSheet, prefix);
-        } else if (ownerNode(importRule)) {
-          again = true;
-          return;  // still valid, do nothing
-        }
-        pendingImportRule.delete(importRule);
-      });
-
-      pendingInvalidSheet.forEach((prefix, sheet) => {
-        if (sheetRulesError(sheet)) {
-          again = true;
-          return;
-        }
-        internalUpgrade(sheet, prefix);
-        pendingInvalidSheet.delete(sheet);
-      });
-
-      // check again next frame
-      if (again) {
-        rAF = window.requestAnimationFrame(check);
-      }
-    }
-
-    return function() {
-      rAF = rAF || window.requestAnimationFrame(check);
-    };
-  }());
-
-  /**
-   * @param {!CSSStyleSheet} sheet
-   * @param {string} prefix
-   */
-  function internalUpgrade(sheet, prefix) {
-    if (upgradedSheets.get(sheet) === prefix) {
-      return;  // already done
-    }
-
-    const e = sheetRulesError(sheet);
-    if (e) {
-      switch (e.code) {
-        case DOMException.SECURITY_ERR:
-          // Occurs if we try to examine a cross-domain CSS file. Fetch it ourselves and update
-          // the CSS once it is available on a 'local' URL.
-          const x = new XMLHttpRequest();
-          x.responseType = 'blob';
-          x.open('GET', sheet.href);
-
-          // This must also be replaced with a temporary @import, as @import must all appear
-          // first. Use a base64 URL that doesn't actually contain anything.
-          const rule = replaceRule(
-              /** @type {!CSSRule} */ (sheet.ownerRule),
-              `@import url('data:text/css;base64,')`
-          );
-
-          x.onload = () => {
-            const url = URL.createObjectURL(/** @type {!Blob} */ (x.response));
-            const update = /** @type {!CSSImportRule} */ (replaceRule(rule, `@import '${url}'`));
-            pendingImportRule.set(update, prefix);
-            requestCheck();
-
-            // We can revoke this URL immediately as it's seemingly read synchronously.
-            URL.revokeObjectURL(url);
-          };
-          // nb. no onerror handling
-
-          x.send();
-          return;
-
-        case DOMException.INVALID_ACCESS_ERR:
-          // This occurs in Firefox if the CSS is yet to be parsed (for dynamic cases), see:
-          //   https://bugzilla.mozilla.org/show_bug.cgi?id=761236
-          pendingInvalidSheet.set(sheet, prefix);
-          requestCheck();
-          return;
-
-        default:
-          throw e;
-      }
-    }
-
-    // Hooray, the sheet is ready to go!
-    upgradedSheets.set(sheet, prefix);
-
-    const l = sheet.cssRules.length;
-    for (let i = 0; i < l; ++i) {
-      const rule = sheet.cssRules[i];
-
-      if (!(rule instanceof CSSImportRule)) {
-        upgradeRule(rule, prefix, sheet, i);
-        continue;
-      }
-
-      if (rule.styleSheet) {
-        // TODO: recursion is bad
-        internalUpgrade(rule.styleSheet, prefix);
-        continue;
-      }
-
-      // otherwise, add to pending queue
-      pendingImportRule.set(rule, prefix);
-      requestCheck();
-    }
-
-    return true;
-  }
-
-  return internalUpgrade;
-}());
-
-
-/**
- * @param {!HTMLStyleElement} node to reset
- */
-function resetCSS(node) {
-  const css = node.textContent;
-  node.textContent = '';
-  node.textContent = css;
-}
-
-
-function applyToAttr(node, attrName, apply) {
-  // default version is to apply to attributes
-  if (apply) {
-    node.setAttribute(attrName, '');
-  } else {
-    node.removeAttribute(attrName);
-  }
-}
-
-function applyToClass(node, attrName, apply) {
-  if (apply) {
-    node.classList.add(attrName);
-  } else {
-    node.classList.remove(attrName);
-  }
-}
-
-
-let applyMode = applyToAttr;
-let uniqueId = 0;
-
-
-function upgrade(node) {
-  const effectiveParent = node['scoped'] && document.body.contains(node) ? node.parentNode : null;
-
-  const state = styleNodes.get(node);
-  if (state) {
-    if (!effectiveParent) {
-      // disappearing, clear state and ask browser to reset CSS
-      styleNodes.delete(node);
-      resetCSS(node);
-    } else if (node.sheet) {
-      // otherwise, upgrade the sheet (succeeds if already done)
-      // nb. node.sheet is null if being removed
-      upgradeSheet(node.sheet, state.prefix);
-    }
-
-    if (state.parent !== effectiveParent) {
-      state.parent && applyMode(state.parent, state.attrName, false);
-      effectiveParent && applyMode(effectiveParent, state.attrName, true);
-      state.parent = effectiveParent;
-    }
-
-    return false;  // already upgraded
-  }
-
-  if (!effectiveParent) {
-    return;  // not scoped CSS, never seen before, ignore
-  }
-
-  // TODO: use hash for deduping
-  // const hash = hashCode(node.textContent);
-
-  // newly found style node, setup attr
-  const attrName = `${scopedCSSOptions['prefix']}${++uniqueId}`;
-  const prefix = applyMode === applyToAttr ? `[${attrName}]` : `.${attrName}`;
-  styleNodes.set(node, {attrName, prefix, parent: node.parentNode});
-
-  upgradeSheet(node.sheet, prefix);
-  applyMode(effectiveParent, attrName, true);
-}
-
-// this mess basically calls resolve() with any <style> nodes that changed/removed/added
-// TODO: is it faster to just call getElementsByTagName('style') and compare to previous
-const mo = new MutationObserver((records) => {
-  const changes = new Set();
-  const iterate = (nodes) => {
-    let i = nodes ? nodes.length : 0;
-    while (i) {
-      const node = nodes[--i];
-      if (!(node instanceof HTMLElement)) {
-        continue;  // text node
-      }
-      if (node instanceof HTMLStyleElement) {
-        changes.add(node);  // directly a <style>
-        continue;
-      }
-      // look for changed children
-      const cand = node.getElementsByTagName('style');
-      let j = cand.length;
-      while (j) {
-        changes.add(cand[--j]);
-      }
-    }
-  };
-
-  records.forEach((record) => {
-    if (record.target instanceof HTMLStyleElement) {
-      changes.add(record.target);
-    } else {
-      iterate(record.addedNodes);
-      iterate(record.removedNodes);
-    }
-  });
-
-  changes.forEach(upgrade);
-});
-
-function setup() {
-  // clone any options from global
-  const cand = window['scopedCSS'];
-  if (typeof cand === 'object') {
-    for (let k in scopedCSSOptions) {
-      if (k in cand) {
-        scopedCSSOptions[k] = cand[k];
-      }
-    }
-
-    if (scopedCSSOptions['applyToClass']) {
-      applyMode = applyToClass;
-    }
-  }
-
-  // nb. watch for attributeFilter: ['scoped'] to detect a CSS rule changing at runtime
-  const options = {childList: true, subtree: true, attributes: true, attributeFilter: ['scoped']};
-  mo.observe(document, options);
-  const collection = document.body.getElementsByTagName('style');
-  for (let i = 0; i < collection.length; ++i) {
-    upgrade(collection[i]);
-  }
-}
-
-exports.setup = setup;
diff --git a/lib/polyfill.js b/lib/polyfill.js
deleted file mode 100644
index 364566f..0000000
--- a/lib/polyfill.js
+++ /dev/null
@@ -1,536 +0,0 @@
-'use strict';
-
-// This monstrosity matches any valid `[foo="bar"]` block, with either quote style. Parenthesis
-// have no special meaning within an attribute selector, and the complex regexp below mostly
-// exists to allow \" or \' in string parts (e.g. `[foo="b\"ar"]`).
-const attrRe = /^\[.*?(?:(["'])(?:.|\\\1)*\1.*)*\]/;
-const walkSelectorRe = /([([,]|:scope\b)/;  // "interesting" setups
-const scopeRe = /^:scope\b/;
-
-const s = document.createElement('style');
-// are we in old IE/Firefox mode, where .selectorText can't be changed inline?
-s.textContent = '.x{color:red;}';
-document.head.appendChild(s);
-s.sheet.cssRules[0].selectorText = '.change';
-const writeMode = s.sheet.cssRules[0].selectorText === '.change';
-document.head.removeChild(s);
-
-const scopedCSSOptions = {
-  'applyToClass': false,
-  'prefix': '__scoped_',
-};
-
-Object.defineProperty(HTMLStyleElement.prototype, 'scoped', {
-  enumerable: true,
-  get() {
-    return this.hasAttribute('scoped');
-  },
-  set(v) {
-    if (v) {
-      this.setAttribute('scoped', this.getAttribute('scoped') || '');
-    } else {
-      this.removeAttribute('scoped');
-    }
-  },
-});
-
-/**
- * @type {!Map<!HTMLStyleElement, {attrName: string, prefix: string, parent: !HTMLElement}>}
- */
-const styleNodes = new Map();
-
-/**
- * Consumes a single selector from candidate selector text, which may contain many.
- *
- * @param {string} raw selector text
- * @return {?{selector: string, rest: string}}
- */
-function consumeSelector(raw, prefix) {
-  let i = raw.search(walkSelectorRe);
-  if (i === -1) {
-    // found literally nothing interesting, success
-    return {
-      selector: `${prefix} ${raw}`,
-      rest: '',
-    };
-  } else if (raw[i] === ',') {
-    // found comma without anything interesting, yield rest
-    return {
-      selector: `${prefix} ${raw.substr(0, i)}`,
-      rest: raw.substr(i + 1),
-    }
-  }
-
-  let leftmost = true;   // whether we're past a descendant or similar selector
-  let scope = false;     // whether :scope has been found + replaced
-  i = raw.search(/\S/);  // place i after initial whitespace only
-
-  let depth = 0;
-outer:
-  for (; i < raw.length; ++i) {
-    const char = raw[i];
-    switch (char) {
-      case '[':
-        const match = attrRe.exec(raw.substr(i));
-        i += (match ? match[0].length : 1) - 1;  // we add 1 every loop
-        continue;
-
-      case '(':
-        ++depth;
-        continue;
-
-      case ':':
-        if (!leftmost) {
-          continue;  // doesn't matter if :scope is here, it'll always be ignored
-        } else if (!scopeRe.test(raw.substr(i))) {
-          continue;  // not ':scope', ignore
-        } else if (depth) {
-          return null;
-        }
-
-        // Replace ':scope' with our prefix. This can happen many times; ':scope:scope' is valid.
-        // It will never apply to a descendant selector (e.g., ".foo :scope") as this is ignored
-        // by browsers anyway (invalid).
-        raw = raw.substring(0, i) + prefix + raw.substr(i + 6);
-        i += prefix.length;
-        scope = true;
-        --i;  // we'd skip over next character otherwise
-        continue;  // run loop again
-
-      case ')':
-        if (depth) {
-          --depth;
-        }
-        continue;
-    }
-    if (depth) {
-      continue;
-    }
-
-    switch (char) {
-      case ',':
-        break outer;
-
-      case ' ':
-      case '>':
-      case '~':
-      case '+':
-        if (!leftmost) {
-          continue;
-        }
-        leftmost = false;
-    }
-  }
-
-  const selector = (scope ? '' : `${prefix} `) + raw.substr(0, i);
-  return {selector, rest: raw.substr(i + 1)};
-}
-
-function updateSelectorText(selectorText, prefix) {
-  const found = [];
-
-  while (selectorText) {
-    const consumed = consumeSelector(selectorText, prefix);
-    if (consumed === null) {
-      return ':not(*)';
-    }
-    found.push(consumed.selector);
-    selectorText = consumed.rest;
-  }
-
-  return found.join(', ');
-}
-
-
-/**
- * Upgrades a specific CSSRule.
- *
- * @param {!CSSRule} rule
- * @param {string} prefix to apply
- * @param {!CSSMediaRule|!CSSStyleSheet} group
- * @param {number} index in group
- */
-function upgradeRule(rule, prefix, group, index) {
-  if (rule instanceof CSSMediaRule) {
-    // upgrade children
-    const l = rule.cssRules.length;
-    for (let j = 0; j < l; ++j) {
-      upgradeRule(rule.cssRules[j], prefix, rule, j);
-    }
-    return;
-  }
-
-  if (!(rule instanceof CSSStyleRule)) {
-    return;  // unknown rule type, ignore
-  }
-
-  const update = updateSelectorText(rule.selectorText, prefix);
-
-  if (writeMode) {
-    // anything but old IE/Firefox
-    rule.selectorText = update;
-  } else {
-    // old browsers which don't allow modification of selectorText
-    const cssText = rule.style.cssText;  // save before we delete
-    group.deleteRule(index);
-    group.insertRule(`${update} {${cssText}}`, index);
-  }
-}
-
-
-/**
- * @param {!CSSRule} rule
- * @return {Node} owner of rule
- */
-function ownerNode(rule) {
-  let sheet = rule.parentStyleSheet;
-  while (sheet) {
-    if (sheet.ownerNode) {
-      return sheet.ownerNode;
-    }
-    sheet = sheet.parentStyleSheet;
-  }
-  return null;
-}
-
-
-/**
- * Replaces a live rule, returning the new `CSSRule` that it was replaced with.
- *
- * @param {!CSSRule} rule
- * @param {string} update to replace with
- * @return {!CSSRule}
- */
-function replaceRule(rule, update) {
-  const parent = rule.parentStyleSheet;
-  let i;
-  for (i = 0; i < parent.rules.length; ++i) {
-    if (parent.rules[i] === rule) {
-      break;
-    }
-  }
-  parent.removeRule(i);
-  parent.insertRule(update, i);
-
-  return parent.rules[i];
-}
-
-
-/**
- * @param {!CSSStyleSheet} sheet
- * @return {?{code: number}} the DOMException found while accessing this CSS
- */
-function sheetRulesError(sheet) {
-  // FIXME: This monstrosity just convinces Closure that `sheet.cssRules` has side-effects.
-  let rules = null;
-  try {
-    rules = sheet.cssRules;
-  } catch (e) {
-    if (e instanceof DOMException) {
-      return e;
-    }
-    throw e;
-  }
-  if (rules) {
-    return null;
-  }
-
-  // Safari no longer throws an error here, just pretend we can't read the data.
-  return {code: DOMException.SECURITY_ERR};
-}
-
-// TODO: upgradeSheet could return a Promise or then-like
-
-/**
- * @param {!CSSStyleSheet} sheet already loaded CSSStyleSheet
- * @param {string} prefix to apply
- * @return {boolean} if applied immediately
- */
-const upgradeSheet = (function() {
-
-  /** @type {!WeakMap<!StyleSheet, string>} */
-  const upgradedSheets = new WeakMap();
-
-  /** @type {!Map<!CSSImportRule, string>} */
-  const pendingImportRule = new Map();
-
-  /** @type {!Map<!CSSStyleSheet, string>} */
-  const pendingInvalidSheet = new Map();
-
-  /**
-   * Callback inside rAF to monitor for @import-style loading or for parsing CSS script tags.
-   * This is ugly, but only happens on styles that are moved or inserted dynamically (static
-   * styles all fire at once).
-   */
-  const requestCheck = (function() {
-    let rAF = 0;
-
-    function check() {
-      let again = false;
-      rAF = 0;
-
-      pendingImportRule.forEach((prefix, importRule) => {
-        if (importRule.styleSheet) {
-          internalUpgrade(importRule.styleSheet, prefix);
-        } else if (ownerNode(importRule)) {
-          again = true;
-          return;  // still valid, do nothing
-        }
-        pendingImportRule.delete(importRule);
-      });
-
-      pendingInvalidSheet.forEach((prefix, sheet) => {
-        if (sheetRulesError(sheet)) {
-          again = true;
-          return;
-        }
-        internalUpgrade(sheet, prefix);
-        pendingInvalidSheet.delete(sheet);
-      });
-
-      // check again next frame
-      if (again) {
-        rAF = window.requestAnimationFrame(check);
-      }
-    }
-
-    return function() {
-      rAF = rAF || window.requestAnimationFrame(check);
-    };
-  }());
-
-  /**
-   * @param {!CSSStyleSheet} sheet
-   * @param {string} prefix
-   */
-  function internalUpgrade(sheet, prefix) {
-    if (upgradedSheets.get(sheet) === prefix) {
-      return;  // already done
-    }
-
-    const e = sheetRulesError(sheet);
-    if (e) {
-      switch (e.code) {
-        case DOMException.SECURITY_ERR:
-          // Occurs if we try to examine a cross-domain CSS file. Fetch it ourselves and update
-          // the CSS once it is available on a 'local' URL.
-          const x = new XMLHttpRequest();
-          x.responseType = 'blob';
-          x.open('GET', sheet.href);
-
-          // This must also be replaced with a temporary @import, as @import must all appear
-          // first. Use a base64 URL that doesn't actually contain anything.
-          const rule = replaceRule(
-              /** @type {!CSSRule} */ (sheet.ownerRule),
-              `@import url('data:text/css;base64,')`
-          );
-
-          x.onload = () => {
-            const url = URL.createObjectURL(/** @type {!Blob} */ (x.response));
-            const update = /** @type {!CSSImportRule} */ (replaceRule(rule, `@import '${url}'`));
-            pendingImportRule.set(update, prefix);
-            requestCheck();
-
-            // We can revoke this URL immediately as it's seemingly read synchronously.
-            URL.revokeObjectURL(url);
-          };
-          // nb. no onerror handling
-
-          x.send();
-          return;
-
-        case DOMException.INVALID_ACCESS_ERR:
-          // This occurs in Firefox if the CSS is yet to be parsed (for dynamic cases), see:
-          //   https://bugzilla.mozilla.org/show_bug.cgi?id=761236
-          pendingInvalidSheet.set(sheet, prefix);
-          requestCheck();
-          return;
-
-        default:
-          throw e;
-      }
-    }
-
-    // Hooray, the sheet is ready to go!
-    upgradedSheets.set(sheet, prefix);
-
-    const l = sheet.cssRules.length;
-    for (let i = 0; i < l; ++i) {
-      const rule = sheet.cssRules[i];
-
-      if (!(rule instanceof CSSImportRule)) {
-        upgradeRule(rule, prefix, sheet, i);
-        continue;
-      }
-
-      if (rule.styleSheet) {
-        // TODO: recursion is bad
-        internalUpgrade(rule.styleSheet, prefix);
-        continue;
-      }
-
-      // otherwise, add to pending queue
-      pendingImportRule.set(rule, prefix);
-      requestCheck();
-    }
-
-    return true;
-  }
-
-  return internalUpgrade;
-}());
-
-
-/**
- * @param {!HTMLStyleElement} node to reset
- */
-function resetCSS(node) {
-  const css = node.textContent;
-  node.textContent = '';
-  node.textContent = css;
-}
-
-
-function applyToAttr(node, attrName, apply) {
-  // default version is to apply to attributes
-  if (apply) {
-    node.setAttribute(attrName, '');
-  } else {
-    node.removeAttribute(attrName);
-  }
-}
-
-function applyToClass(node, attrName, apply) {
-  if (apply) {
-    node.classList.add(attrName);
-  } else {
-    node.classList.remove(attrName);
-  }
-}
-
-
-let applyMode = applyToAttr;
-let uniqueId = 0;
-
-
-function upgrade(node) {
-  const effectiveParent = node['scoped'] && document.body.contains(node) ? node.parentNode : null;
-
-  const state = styleNodes.get(node);
-  if (state) {
-    if (!effectiveParent) {
-      // disappearing, clear state and ask browser to reset CSS
-      styleNodes.delete(node);
-      resetCSS(node);
-    } else if (node.sheet) {
-      // otherwise, upgrade the sheet (succeeds if already done)
-      // nb. node.sheet is null if being removed
-      upgradeSheet(node.sheet, state.prefix);
-    }
-
-    if (state.parent !== effectiveParent) {
-      state.parent && applyMode(state.parent, state.attrName, false);
-      effectiveParent && applyMode(effectiveParent, state.attrName, true);
-      state.parent = effectiveParent;
-    }
-
-    return false;  // already upgraded
-  }
-
-  if (!effectiveParent) {
-    return;  // not scoped CSS, never seen before, ignore
-  }
-
-  // TODO: use hash for deduping
-  // const hash = hashCode(node.textContent);
-
-  // newly found style node, setup attr
-  const attrName = `${scopedCSSOptions['prefix']}${++uniqueId}`;
-  const prefix = applyMode === applyToAttr ? `[${attrName}]` : `.${attrName}`;
-  styleNodes.set(node, {attrName, prefix, parent: node.parentNode});
-
-  upgradeSheet(node.sheet, prefix);
-  applyMode(effectiveParent, attrName, true);
-}
-
-// this mess basically calls resolve() with any <style> nodes that changed/removed/added
-// TODO: is it faster to just call getElementsByTagName('style') and compare to previous
-const mo = new MutationObserver((records) => {
-  const changes = new Set();
-  const iterate = (nodes) => {
-    let i = nodes ? nodes.length : 0;
-    while (i) {
-      const node = nodes[--i];
-      if (!(node instanceof HTMLElement)) {
-        continue;  // text node
-      }
-      if (node instanceof HTMLStyleElement) {
-        changes.add(node);  // directly a <style>
-        continue;
-      }
-      // look for changed children
-      const cand = node.getElementsByTagName('style');
-      let j = cand.length;
-      while (j) {
-        changes.add(cand[--j]);
-      }
-    }
-  };
-
-  records.forEach((record) => {
-    if (record.target instanceof HTMLStyleElement) {
-      changes.add(record.target);
-    } else {
-      iterate(record.addedNodes);
-      iterate(record.removedNodes);
-    }
-  });
-
-  changes.forEach(upgrade);
-});
-
-function setup() {
-  // clone any options from global
-  const cand = window['scopedCSS'];
-  if (typeof cand === 'object') {
-    for (let k in scopedCSSOptions) {
-      if (k in cand) {
-        scopedCSSOptions[k] = cand[k];
-      }
-    }
-
-    if (scopedCSSOptions['applyToClass']) {
-      applyMode = applyToClass;
-    }
-  }
-
-  // nb. watch for attributeFilter: ['scoped'] to detect a CSS rule changing at runtime
-  const options = {childList: true, subtree: true, attributes: true, attributeFilter: ['scoped']};
-  mo.observe(document, options);
-  const collection = document.body.getElementsByTagName('style');
-  for (let i = 0; i < collection.length; ++i) {
-    upgrade(collection[i]);
-  }
-}
-
-/*
- * Copyright 2017 Google Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License"); you may not
- * use this file except in compliance with the License. You may obtain a copy of
- * the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
- * License for the specific language governing permissions and limitations under
- * the License.
- */
-
-if (document.readyState === 'loading') {
-  window.addEventListener('DOMContentLoaded', setup);
-} else {
-  setup();
-}

From 9ded04a61db0b01be9e08458da2a42b1a54507d2 Mon Sep 17 00:00:00 2001
From: Chess Luo <chess@luo.sh>
Date: Wed, 6 Apr 2022 00:22:35 +0800
Subject: [PATCH 5/7] remove unnecessary double-slash

---
 test.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test.js b/test.js
index 06ed774..25a17d6 100644
--- a/test.js
+++ b/test.js
@@ -14,7 +14,7 @@
  * the License.
  */
 
-import './dist\/scoped.js';
+import './dist/scoped.js';
 
 suite('scoped', function() {
 

From 38792e2c35fd8d33768258b65f9a89c20ce6fea2 Mon Sep 17 00:00:00 2001
From: Chess Luo <chess@luo.sh>
Date: Thu, 7 Apr 2022 23:18:52 +0800
Subject: [PATCH 6/7] update rollup config

---
 demo/test.html       |   2 +-
 package-lock.json    | 377 +++++++++++++++++++++++--------------------
 package.json         |  18 +--
 rollup.config.js     |  48 ++++++
 rollup.umd.config.js |  23 ---
 test.js              |   2 +-
 6 files changed, 262 insertions(+), 208 deletions(-)
 create mode 100644 rollup.config.js
 delete mode 100644 rollup.umd.config.js

diff --git a/demo/test.html b/demo/test.html
index 48fbb37..36376ff 100644
--- a/demo/test.html
+++ b/demo/test.html
@@ -122,6 +122,6 @@ <h3>The following should not be colored (not scoped)</h3>
   });
 </script>
 
-<script src="../dist/scoped.js"></script>
+<script src="../dist/polyfill.js"></script>
 </body>
 </html>
diff --git a/package-lock.json b/package-lock.json
index 8f4ef41..62b179b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,8 +13,8 @@
         "google-closure-compiler": "^20220301.0.0",
         "headless-test": "^1.0.3",
         "npm-run-all": "^4.1.5",
-        "rollup": "^1.32.1",
-        "rollup-plugin-uglify": "^6.0.4"
+        "rollup": "^2.70.1",
+        "rollup-plugin-terser": "^7.0.2"
       }
     },
     "node_modules/@babel/code-frame": {
@@ -39,9 +39,9 @@
       }
     },
     "node_modules/@babel/highlight": {
-      "version": "7.16.10",
-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.16.10.tgz",
-      "integrity": "sha512-5FnTQLSLswEj6IkgVw5KusNUUFY9ZGqe/TRFnP/BKYHYgfh7tc+C7mwiy95/yNP7Dh9x580Vv8r7u7ZfTBFxdw==",
+      "version": "7.17.9",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.17.9.tgz",
+      "integrity": "sha512-J9PfEKCbFIv2X5bjTMiZu6Vf341N05QIY+d6FvVKynkG1S7G0j3I0QoRtWIrXhZ+/Nlb5Q0MzqL7TokEJ5BNHg==",
       "dev": true,
       "dependencies": {
         "@babel/helper-validator-identifier": "^7.16.7",
@@ -120,12 +120,6 @@
       "integrity": "sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==",
       "dev": true
     },
-    "node_modules/@types/estree": {
-      "version": "0.0.51",
-      "resolved": "https://registry.npmjs.org/@types/estree/-/estree-0.0.51.tgz",
-      "integrity": "sha512-CuPgU6f3eT/XgKKPqKd/gLZV1Xmvf1a2R5POBOGQa6uv82xpls89HU5zKeVoyR8XzHd1RGNOlQlvUe3CFkjWNQ==",
-      "dev": true
-    },
     "node_modules/@types/mime-types": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/@types/mime-types/-/mime-types-2.1.0.tgz",
@@ -139,9 +133,9 @@
       "dev": true
     },
     "node_modules/acorn": {
-      "version": "7.4.1",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.4.1.tgz",
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-      "version": "1.32.1",
-      "resolved": "https://registry.npmjs.org/rollup/-/rollup-1.32.1.tgz",
-      "integrity": "sha512-/2HA0Ec70TvQnXdzynFffkjA6XN+1e2pEv/uKS5Ulca40g2L7KuOE3riasHoNVHOsFD5KKZgDsMk1CP3Tw9s+A==",
+      "version": "2.70.1",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-2.70.1.tgz",
+      "integrity": "sha512-CRYsI5EuzLbXdxC6RnYhOuRdtz4bhejPMSWjsFLfVM/7w/85n2szZv6yExqUXsBdz5KT8eoubeyDUDjhLHEslA==",
       "dev": true,
       "requires": {
-        "@types/estree": "*",
-        "@types/node": "*",
-        "acorn": "^7.1.0"
+        "fsevents": "~2.3.2"
+      },
+      "dependencies": {
+        "fsevents": {
+          "version": "2.3.2",
+          "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.2.tgz",
+          "integrity": "sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA==",
+          "dev": true,
+          "optional": true
+        }
       }
     },
-    "rollup-plugin-uglify": {
-      "version": "6.0.4",
-      "resolved": "https://registry.npmjs.org/rollup-plugin-uglify/-/rollup-plugin-uglify-6.0.4.tgz",
-      "integrity": "sha512-ddgqkH02klveu34TF0JqygPwZnsbhHVI6t8+hGTcYHngPkQb5MIHI0XiztXIN/d6V9j+efwHAqEL7LspSxQXGw==",
+    "rollup-plugin-terser": {
+      "version": "7.0.2",
+      "resolved": "https://registry.npmjs.org/rollup-plugin-terser/-/rollup-plugin-terser-7.0.2.tgz",
+      "integrity": "sha512-w3iIaU4OxcF52UUXiZNsNeuXIMDvFrr+ZXK6bFZ0Q60qyVfq4uLptoS4bbq3paG3x216eQllFZX7zt6TIImguQ==",
       "dev": true,
       "requires": {
-        "@babel/code-frame": "^7.0.0",
-        "jest-worker": "^24.0.0",
-        "serialize-javascript": "^2.1.2",
-        "uglify-js": "^3.4.9"
+        "@babel/code-frame": "^7.10.4",
+        "jest-worker": "^26.2.1",
+        "serialize-javascript": "^4.0.0",
+        "terser": "^5.0.0"
       }
     },
     "safe-buffer": {
@@ -4971,10 +4971,13 @@
       "dev": true
     },
     "serialize-javascript": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/serialize-javascript/-/serialize-javascript-2.1.2.tgz",
-      "integrity": "sha512-rs9OggEUF0V4jUSecXazOYsLfu7OGK2qIn3c7IPBiffz32XniEp/TX9Xmc9LQfK2nQ2QKHvZ2oygKUGU0lG4jQ==",
-      "dev": true
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/serialize-javascript/-/serialize-javascript-4.0.0.tgz",
+      "integrity": "sha512-GaNA54380uFefWghODBWEGisLZFj00nS5ACs6yHa9nLqlLpVLO8ChDGeKRjZnV4Nh4n0Qi7nhYZD/9fCPzEqkw==",
+      "dev": true,
+      "requires": {
+        "randombytes": "^2.1.0"
+      }
     },
     "set-blocking": {
       "version": "2.0.0",
@@ -5026,6 +5029,24 @@
       "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
       "dev": true
     },
+    "source-map-support": {
+      "version": "0.5.21",
+      "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.21.tgz",
+      "integrity": "sha512-uBHU3L3czsIyYXKX88fdrGovxdSCoTGDRZ6SYXtSRxLZUzHg5P/66Ht6uoUlHu9EZod+inXhKo3qQgwXUT/y1w==",
+      "dev": true,
+      "requires": {
+        "buffer-from": "^1.0.0",
+        "source-map": "^0.6.0"
+      },
+      "dependencies": {
+        "source-map": {
+          "version": "0.6.1",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+          "dev": true
+        }
+      }
+    },
     "spdx-correct": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/spdx-correct/-/spdx-correct-3.1.1.tgz",
@@ -5156,6 +5177,26 @@
       "integrity": "sha512-ot0WnXS9fgdkgIcePe6RHNk1WA8+muPa6cSjeR3V8K27q9BB1rTE3R1p7Hv0z1ZyAc8s6Vvv8DIyWf681MAt0w==",
       "dev": true
     },
+    "terser": {
+      "version": "5.12.1",
+      "resolved": "https://registry.npmjs.org/terser/-/terser-5.12.1.tgz",
+      "integrity": "sha512-NXbs+7nisos5E+yXwAD+y7zrcTkMqb0dEJxIGtSKPdCBzopf7ni4odPul2aechpV7EXNvOudYOX2bb5tln1jbQ==",
+      "dev": true,
+      "requires": {
+        "acorn": "^8.5.0",
+        "commander": "^2.20.0",
+        "source-map": "~0.7.2",
+        "source-map-support": "~0.5.20"
+      },
+      "dependencies": {
+        "source-map": {
+          "version": "0.7.3",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.7.3.tgz",
+          "integrity": "sha512-CkCj6giN3S+n9qrYiBTX5gystlENnRW5jZeNLHpe6aue+SrHcG5VYwujhW9s4dY31mEGsxBDrHR6oI69fTXsaQ==",
+          "dev": true
+        }
+      }
+    },
     "to-regex-range": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
@@ -5177,12 +5218,6 @@
       "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
       "dev": true
     },
-    "uglify-js": {
-      "version": "3.15.3",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.15.3.tgz",
-      "integrity": "sha512-6iCVm2omGJbsu3JWac+p6kUiOpg3wFO2f8lIXjfEb8RrmLjzog1wTPMmwKB7swfzzqxj9YM+sGUM++u1qN4qJg==",
-      "dev": true
-    },
     "unbox-primitive": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/unbox-primitive/-/unbox-primitive-1.0.1.tgz",
diff --git a/package.json b/package.json
index 2aa6910..965c558 100644
--- a/package.json
+++ b/package.json
@@ -2,24 +2,18 @@
   "name": "style-scoped",
   "version": "0.2.2",
   "description": "style[scoped] polyfill",
-  "main": "lib/index.js",
-  "module": "src/index.js",
-  "jsnext:main": "src/index.js",
+  "main": "dist/lib.js",
+  "module": "dist/lib.esm.js",
   "files": [
     "src",
-    "lib",
     "dist"
   ],
   "author": "Sam Thorogood <sam.thorogood@gmail.com>",
   "license": "Apache-2",
   "scripts": {
-    "test": "npm run build:umd-polyfill && headless-test --cors test.js",
+    "test": "npm run build && headless-test --cors test.js",
     "closure": "google-closure-compiler --js=src/*.js --checks_only --module_resolution=node --compilation_level=ADVANCED",
-    "build": "run-p build:**",
-    "build:cjs": "rollup -i src/index.js -o lib/index.js -f cjs",
-    "build:cjs-polyfill": "rollup -i src/polyfill.js -o lib/polyfill.js -f cjs",
-    "build:umd-polyfill": "cross-env NODE_ENV=development rollup -i src/polyfill.js -o dist/scoped.js -c rollup.umd.config.js",
-    "build:umd-polyfill:min": "cross-env NODE_ENV=production rollup -i src/polyfill.js -o dist/scoped.min.js -c rollup.umd.config.js",
+    "build": "rollup -c",
     "prepare": "npm run build"
   },
   "devDependencies": {
@@ -27,7 +21,7 @@
     "google-closure-compiler": "^20220301.0.0",
     "headless-test": "^1.0.3",
     "npm-run-all": "^4.1.5",
-    "rollup": "^1.32.1",
-    "rollup-plugin-uglify": "^6.0.4"
+    "rollup": "^2.70.1",
+    "rollup-plugin-terser": "^7.0.2"
   }
 }
diff --git a/rollup.config.js b/rollup.config.js
new file mode 100644
index 0000000..94f1789
--- /dev/null
+++ b/rollup.config.js
@@ -0,0 +1,48 @@
+import { terser } from "rollup-plugin-terser";
+
+export default [
+  {
+    input: 'src/polyfill.js',
+    output: [
+      {
+        file: 'dist/polyfill.js',
+        format: 'umd'
+      },
+    ],
+    plugins: []
+  },
+  {
+    input: 'src/polyfill.js',
+    output: [
+      {
+        file: 'dist/polyfill.min.js',
+        format: 'umd'
+      },
+    ],
+    plugins: [terser()]
+  },
+  {
+    input: 'src/index.js',
+    output: [
+      {
+        file: 'dist/lib.js',
+        format: 'cjs'
+      },
+      {
+        file: 'dist/lib.esm.js',
+        format: 'es'
+      }
+    ],
+    plugins: []
+  },
+  {
+    input: 'src/index.js',
+    output: [
+      {
+        file: 'dist/lib.min.js',
+        format: 'cjs'
+      },
+    ],
+    plugins: [terser()]
+  },
+];
\ No newline at end of file
diff --git a/rollup.umd.config.js b/rollup.umd.config.js
deleted file mode 100644
index 7e71fa9..0000000
--- a/rollup.umd.config.js
+++ /dev/null
@@ -1,23 +0,0 @@
-import { uglify } from 'rollup-plugin-uglify';
-
-const umdConfig = {
-  output: {
-    format: 'umd',
-    name: 'scoped',
-  },
-  plugins: []
-};
-
-if (process.env.NODE_ENV === 'production') {
-  umdConfig.plugins.push(
-    uglify({
-      compress: {
-        pure_getters: true,
-        unsafe: true,
-        unsafe_comps: true,
-      },
-    })
-  );
-}
-
-export default umdConfig;
\ No newline at end of file
diff --git a/test.js b/test.js
index 25a17d6..1ff5e62 100644
--- a/test.js
+++ b/test.js
@@ -14,7 +14,7 @@
  * the License.
  */
 
-import './dist/scoped.js';
+import './dist/polyfill.js';
 
 suite('scoped', function() {
 

From e6a047a8aa6bd59c4e2585072fdf62bebc05242d Mon Sep 17 00:00:00 2001
From: Chess Luo <chess@luo.sh>
Date: Thu, 7 Apr 2022 23:23:00 +0800
Subject: [PATCH 7/7] removes unused deps

---
 package-lock.json | 780 ----------------------------------------------
 package.json      |   2 -
 2 files changed, 782 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index 62b179b..e1ebe65 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,10 +9,8 @@
       "version": "0.2.2",
       "license": "Apache-2",
       "devDependencies": {
-        "cross-env": "^7.0.3",
         "google-closure-compiler": "^20220301.0.0",
         "headless-test": "^1.0.3",
-        "npm-run-all": "^4.1.5",
         "rollup": "^2.70.1",
         "rollup-plugin-terser": "^7.0.2"
       }
@@ -538,83 +536,6 @@
       "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
       "dev": true
     },
-    "node_modules/cross-env": {
-      "version": "7.0.3",
-      "resolved": "https://registry.npmjs.org/cross-env/-/cross-env-7.0.3.tgz",
-      "integrity": "sha512-+/HKd6EgcQCJGh2PSjZuUitQBQynKor4wrFbRg4DtAgS1aWO+gU52xpH7M9ScGgXSYmAVS9bIJ8EzuaGw0oNAw==",
-      "dev": true,
-      "dependencies": {
-        "cross-spawn": "^7.0.1"
-      },
-      "bin": {
-        "cross-env": "src/bin/cross-env.js",
-        "cross-env-shell": "src/bin/cross-env-shell.js"
-      },
-      "engines": {
-        "node": ">=10.14",
-        "npm": ">=6",
-        "yarn": ">=1"
-      }
-    },
-    "node_modules/cross-env/node_modules/cross-spawn": {
-      "version": "7.0.3",
-      "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.3.tgz",
-      "integrity": "sha512-iRDPJKUPVEND7dHPO8rkbOnPpyDygcDFtWjpeWNCgy8WP2rXcxXL8TskReQl6OrB2G7+UJrags1q15Fudc7G6w==",
-      "dev": true,
-      "dependencies": {
-        "path-key": "^3.1.0",
-        "shebang-command": "^2.0.0",
-        "which": "^2.0.1"
-      },
-      "engines": {
-        "node": ">= 8"
-      }
-    },
-    "node_modules/cross-env/node_modules/path-key": {
-      "version": "3.1.1",
-      "resolved": "https://registry.npmjs.org/path-key/-/path-key-3.1.1.tgz",
-      "integrity": "sha512-ojmeN0qd+y0jszEtoY48r0Peq5dwMEkIlCOu6Q5f41lfkswXuKtYrhgoTpLnyIcHm24Uhqx+5Tqm2InSwLhE6Q==",
-      "dev": true,
-      "engines": {
-        "node": ">=8"
-      }
-    },
-    "node_modules/cross-env/node_modules/shebang-command": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",
-      "integrity": "sha512-kHxr2zZpYtdmrN1qDjrrX/Z1rR1kG8Dx+gkpK1G4eXmvXswmcE1hTWBWYUzlraYw1/yZp6YuDY77YtvbN0dmDA==",
-      "dev": true,
-      "dependencies": {
-        "shebang-regex": "^3.0.0"
-      },
-      "engines": {
-        "node": ">=8"
-      }
-    },
-    "node_modules/cross-env/node_modules/shebang-regex": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/shebang-regex/-/shebang-regex-3.0.0.tgz",
-      "integrity": "sha512-7++dFhtcx3353uBaq8DDR4NuxBetBzC7ZQOhmTQInHEd6bSrXdiEyzCvG07Z44UYdLShWUyXt5M/yhz8ekcb1A==",
-      "dev": true,
-      "engines": {
-        "node": ">=8"
-      }
-    },
-    "node_modules/cross-env/node_modules/which": {
-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
-      "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
-      "dev": true,
-      "dependencies": {
-        "isexe": "^2.0.0"
-      },
-      "bin": {
-        "node-which": "bin/node-which"
-      },
-      "engines": {
-        "node": ">= 8"
-      }
-    },
     "node_modules/cross-spawn": {
       "version": "5.1.0",
       "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-5.1.0.tgz",
@@ -763,15 +684,6 @@
       "integrity": "sha512-CwBLREIQ7LvYFB0WyRvwhq5N5qPhc6PMjD6bYggFlI5YyDgl+0vxq5VHbMOFqLg7hfWzmu8T5Z1QofhmTIhItA==",
       "dev": true
     },
-    "node_modules/error-ex": {
-      "version": "1.3.2",
-      "resolved": "https://registry.npmjs.org/error-ex/-/error-ex-1.3.2.tgz",
-      "integrity": "sha512-7dFHNmqeFSEt2ZBsCriorKnn3Z2pj+fd9kmI6QoWw4//DL+icEBfc0U7qJCisqrTsKTjw4fNFy2pW9OqStD84g==",
-      "dev": true,
-      "dependencies": {
-        "is-arrayish": "^0.2.1"
-      }
-    },
     "node_modules/es-abstract": {
       "version": "1.19.2",
       "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.19.2.tgz",
@@ -1177,12 +1089,6 @@
         "node": ">=4"
       }
     },
-    "node_modules/graceful-fs": {
-      "version": "4.2.9",
-      "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.2.9.tgz",
-      "integrity": "sha512-NtNxqUcXgpW2iMrfqSfR73Glt39K+BLwWsPs94yR63v45T0Wbej7eRmL5cWfwEgqXnmjQp3zaJTshdRW/qC2ZQ==",
-      "dev": true
-    },
     "node_modules/growl": {
       "version": "1.10.5",
       "resolved": "https://registry.npmjs.org/growl/-/growl-1.10.5.tgz",
@@ -1275,12 +1181,6 @@
         "headless-test": "run.js"
       }
     },
-    "node_modules/hosted-git-info": {
-      "version": "2.8.9",
-      "resolved": "https://registry.npmjs.org/hosted-git-info/-/hosted-git-info-2.8.9.tgz",
-      "integrity": "sha512-mxIDAb9Lsm6DoOJ7xH+5+X4y1LU/4Hi50L9C5sIswK3JzULS4bwk1FvjdBgvYR4bzT4tuUQiC15FE2f5HbLvYw==",
-      "dev": true
-    },
     "node_modules/https-proxy-agent": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/https-proxy-agent/-/https-proxy-agent-4.0.0.tgz",
@@ -1334,12 +1234,6 @@
         "node": ">= 0.4"
       }
     },
-    "node_modules/is-arrayish": {
-      "version": "0.2.1",
-      "resolved": "https://registry.npmjs.org/is-arrayish/-/is-arrayish-0.2.1.tgz",
-      "integrity": "sha1-d8mYQFJ6qOyxqLppe4BkWnqSap0=",
-      "dev": true
-    },
     "node_modules/is-bigint": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/is-bigint/-/is-bigint-1.0.4.tgz",
@@ -1401,18 +1295,6 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
-    "node_modules/is-core-module": {
-      "version": "2.8.1",
-      "resolved": "https://registry.npmjs.org/is-core-module/-/is-core-module-2.8.1.tgz",
-      "integrity": "sha512-SdNCUs284hr40hFTFP6l0IfZ/RSrMXF3qgoRHd3/79unUTvrFO/JoXwkGm+5J/Oe3E/b5GsnG330uUNgRpu1PA==",
-      "dev": true,
-      "dependencies": {
-        "has": "^1.0.3"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
-      }
-    },
     "node_modules/is-date-object": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/is-date-object/-/is-date-object-1.0.2.tgz",
@@ -1612,27 +1494,6 @@
         "js-yaml": "bin/js-yaml.js"
       }
     },
-    "node_modules/json-parse-better-errors": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/json-parse-better-errors/-/json-parse-better-errors-1.0.2.tgz",
-      "integrity": "sha512-mrqyZKfX5EhL7hvqcV6WG1yYjnjeuYDzDhhcAAUrq8Po85NBQBJP+ZDUT75qZQ98IkUoBqdkExkukOU7Ts2wrw==",
-      "dev": true
-    },
-    "node_modules/load-json-file": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/load-json-file/-/load-json-file-4.0.0.tgz",
-      "integrity": "sha1-L19Fq5HjMhYjT9U62rZo607AmTs=",
-      "dev": true,
-      "dependencies": {
-        "graceful-fs": "^4.1.2",
-        "parse-json": "^4.0.0",
-        "pify": "^3.0.0",
-        "strip-bom": "^3.0.0"
-      },
-      "engines": {
-        "node": ">=4"
-      }
-    },
     "node_modules/locate-path": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-3.0.0.tgz",
@@ -1736,15 +1597,6 @@
         "yallist": "^2.1.2"
       }
     },
-    "node_modules/memorystream": {
-      "version": "0.3.1",
-      "resolved": "https://registry.npmjs.org/memorystream/-/memorystream-0.3.1.tgz",
-      "integrity": "sha1-htcJCzDORV1j+64S3aUaR93K+bI=",
-      "dev": true,
-      "engines": {
-        "node": ">= 0.10.0"
-      }
-    },
     "node_modules/merge-stream": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/merge-stream/-/merge-stream-2.0.0.tgz",
@@ -1893,12 +1745,6 @@
       "integrity": "sha512-tgp+dl5cGk28utYktBsrFqA7HKgrhgPsg6Z/EfhWI4gl1Hwq8B/GmY/0oXZ6nF8hDVesS/FpnYaD/kOWhYQvyg==",
       "dev": true
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diff --git a/package.json b/package.json
index 965c558..5d3b5f7 100644
--- a/package.json
+++ b/package.json
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