diff --git a/index.js b/index.js
index ab89f0d..bb3d570 100644
--- a/index.js
+++ b/index.js
@@ -5,161 +5,159 @@
 'use strict';
 
 var ASN1 = require('./asn1'),
-  Base64 = require('./base64'),
-  Hex = require('./hex'),
-  maxLength = 10240,
-  reHex = /^\s*(?:[0-9A-Fa-f][0-9A-Fa-f]\s*)+$/,
-  tree = id('tree'),
-  dump = id('dump'),
-  wantHex = id('wantHex'),
-  area = id('area'),
-  file = id('file'),
-  examples = id('examples'),
-  selectTheme = id('theme-select'),
-  selectTag = id('tags'),
-  hash = null;
+    Base64 = require('./base64'),
+    Hex = require('./hex'),
+    tags = require('./tags'),
+    maxLength = 10240,
+    reHex = /^\s*(?:[0-9A-Fa-f][0-9A-Fa-f]\s*)+$/,
+    tree = id('tree'),
+    dump = id('dump'),
+    wantHex = id('wantHex'),
+    area = id('area'),
+    file = id('file'),
+    examples = id('examples'),
+    selectTheme = id('theme-select'),
+    selectTag = id('tags'),
+    hash = null;
 
 require('./dom'); // side effect: augment ASN1
-if (!window.console || !window.console.log)
-  // IE8 with closed developer tools
-  window.console = { log: function () {} };
+if (!window.console || !window.console.log) // IE8 with closed developer tools
+    window.console = { log: function () {} };
 function id(elem) {
-  return document.getElementById(elem);
+    return document.getElementById(elem);
 }
 function text(el, string) {
-  if ('textContent' in el) el.textContent = string;
-  else el.innerText = string;
+    if ('textContent' in el) el.textContent = string;
+    else el.innerText = string;
 }
 function decode(der, offset) {
-  offset = offset || 0;
-  tree.innerHTML = '';
-  dump.innerHTML = '';
-  try {
-    var asn1 = ASN1.decode(der, offset);
-    tree.appendChild(asn1.toDOM());
-    if (wantHex.checked) dump.appendChild(asn1.toHexDOM());
-    var b64 = der.length < maxLength ? asn1.toB64String() : '';
-    if (area.value === '') area.value = Base64.pretty(b64);
+    offset = offset || 0;
+    tree.innerHTML = '';
+    dump.innerHTML = '';
     try {
-      window.location.hash = hash = '#' + b64;
+        var asn1 = ASN1.decode(der, offset);
+        tree.appendChild(asn1.toDOM());
+        if (wantHex.checked) dump.appendChild(asn1.toHexDOM());
+        var b64 = der.length < maxLength ? asn1.toB64String() : '';
+        if (area.value === '') area.value = Base64.pretty(b64);
+        try {
+            window.location.hash = hash = '#' + b64;
+        } catch (e) {
+            // fails with "Access Denied" on IE with URLs longer than ~2048 chars
+            window.location.hash = hash = '#';
+        }
+        var endOffset = asn1.posEnd();
+        if (endOffset < der.length) {
+            var p = document.createElement('p');
+            p.innerText = 'Input contains ' + (der.length - endOffset) + ' more bytes to decode.';
+            var button = document.createElement('button');
+            button.innerText = 'try to decode';
+            button.onclick = function () {
+                decode(der, endOffset);
+            };
+            p.appendChild(button);
+            tree.insertBefore(p, tree.firstChild);
+        }
     } catch (e) {
-      // fails with "Access Denied" on IE with URLs longer than ~2048 chars
-      window.location.hash = hash = '#';
-    }
-    var endOffset = asn1.posEnd();
-    if (endOffset < der.length) {
-      var p = document.createElement('p');
-      p.innerText = 'Input contains ' + (der.length - endOffset) + ' more bytes to decode.';
-      var button = document.createElement('button');
-      button.innerText = 'try to decode';
-      button.onclick = function () {
-        decode(der, endOffset);
-      };
-      p.appendChild(button);
-      tree.insertBefore(p, tree.firstChild);
+        text(tree, e);
     }
-  } catch (e) {
-    text(tree, e);
-  }
 }
 function decodeText(val) {
-  try {
-    var der = reHex.test(val) ? Hex.decode(val) : Base64.unarmor(val);
-    decode(der);
-  } catch (e) {
-    text(tree, e);
-    dump.innerHTML = '';
-  }
+    try {
+        var der = reHex.test(val) ? Hex.decode(val) : Base64.unarmor(val);
+        decode(der);
+    } catch (e) {
+        text(tree, e);
+        dump.innerHTML = '';
+    }
 }
 function decodeBinaryString(str) {
-  var der;
-  try {
-    if (reHex.test(str)) der = Hex.decode(str);
-    else if (Base64.re.test(str)) der = Base64.unarmor(str);
-    else der = str;
-    decode(der);
-  } catch (e) {
-    text(tree, 'Cannot decode file.');
-    dump.innerHTML = '';
-  }
+    var der;
+    try {
+        if (reHex.test(str)) der = Hex.decode(str);
+        else if (Base64.re.test(str)) der = Base64.unarmor(str);
+        else der = str;
+        decode(der);
+    } catch (e) {
+        text(tree, 'Cannot decode file.');
+        dump.innerHTML = '';
+    }
 }
 // set up buttons
 id('butDecode').onclick = function () {
-  decodeText(area.value);
+    decodeText(area.value);
 };
 id('butClear').onclick = function () {
-  area.value = '';
-  file.value = '';
-  tree.innerHTML = '';
-  dump.innerHTML = '';
-  hash = window.location.hash = '';
+    area.value = '';
+    file.value = '';
+    tree.innerHTML = '';
+    dump.innerHTML = '';
+    hash = window.location.hash = '';
 };
 id('butExample').onclick = function () {
-  console.log('Loading example:', examples.value);
-  var request = new XMLHttpRequest();
-  request.open('GET', 'examples/' + examples.value, true);
-  request.onreadystatechange = function () {
-    if (this.readyState !== 4) return;
-    if (this.status >= 200 && this.status < 400) {
-      area.value = this.responseText;
-      decodeText(this.responseText);
-    } else {
-      console.log('Error loading example.');
-    }
-  };
-  request.send();
+    console.log('Loading example:', examples.value);
+    var request = new XMLHttpRequest();
+    request.open('GET', 'examples/' + examples.value, true);
+    request.onreadystatechange = function () {
+        if (this.readyState !== 4) return;
+        if (this.status >= 200 && this.status < 400) {
+            area.value = this.responseText;
+            decodeText(this.responseText);
+        } else {
+            console.log('Error loading example.');
+        }
+    };
+    request.send();
 };
 // set dark theme depending on OS settings
 function setTheme() {
-  const storedTheme = localStorage.getItem('theme');
-  let theme = 'os';
-  if (storedTheme)
-    theme = storedTheme;
-  selectTheme.value = theme;
-  if (theme == 'os') {
-    const prefersDarkScheme = window.matchMedia('(prefers-color-scheme: dark)');
-    theme = prefersDarkScheme.matches ? 'dark': 'light';
-  }
-  const themeLink = document.querySelector('#theme-link');
-  themeLink.href = (theme == 'dark') ? 'index-dark.css' : 'index.css';
+    var storedTheme = localStorage.getItem('theme');
+    var theme = 'os';
+    if (storedTheme)
+        theme = storedTheme;
+    selectTheme.value = theme;
+    if (theme == 'os') {
+        var prefersDarkScheme = window.matchMedia('(prefers-color-scheme: dark)');
+        theme = prefersDarkScheme.matches ? 'dark': 'light';
+    }
+    id('theme-link').href = (theme == 'dark') ? 'index-dark.css' : 'index.css';
 }
 setTheme();
 selectTheme.addEventListener('change', function () {
-  const selectedTheme = selectTheme.value;
-  localStorage.setItem('theme', selectedTheme);
-  setTheme();
+    localStorage.setItem('theme', selectTheme.value);
+    setTheme();
 });
 // this is only used if window.FileReader
 function read(f) {
-  area.value = ''; // clear text area, will get b64 content
-  var r = new FileReader();
-  r.onloadend = function () {
-    if (r.error) alert("Your browser couldn't read the specified file (error code " + r.error.code + ').');
-    else decodeBinaryString(r.result);
-  };
-  r.readAsBinaryString(f);
+    area.value = ''; // clear text area, will get b64 content
+    var r = new FileReader();
+    r.onloadend = function () {
+        if (r.error) alert("Your browser couldn't read the specified file (error code " + r.error.code + ').');
+        else decodeBinaryString(r.result);
+    };
+    r.readAsBinaryString(f);
 }
 function load() {
-  if (file.files.length === 0) alert('Select a file to load first.');
-  else read(file.files[0]);
+    if (file.files.length === 0) alert('Select a file to load first.');
+    else read(file.files[0]);
 }
 function loadFromHash() {
-  if (window.location.hash && window.location.hash != hash) {
-    hash = window.location.hash;
-    // Firefox is not consistent with other browsers and returns an
-    // already-decoded hash string so we risk double-decoding here,
-    // but since % is not allowed in base64 nor hexadecimal, it's ok
-    var val = decodeURIComponent(hash.substr(1));
-    if (val.length) decodeText(val);
-  }
+    if (window.location.hash && window.location.hash != hash) {
+        hash = window.location.hash;
+        // Firefox is not consistent with other browsers and returns an
+        // already-decoded hash string so we risk double-decoding here,
+        // but since % is not allowed in base64 nor hexadecimal, it's ok
+        var val = decodeURIComponent(hash.substr(1));
+        if (val.length) decodeText(val);
+    }
 }
 function stop(e) {
-  e.stopPropagation();
-  e.preventDefault();
+    e.stopPropagation();
+    e.preventDefault();
 }
 function dragAccept(e) {
-  stop(e);
-  if (e.dataTransfer.files.length > 0) read(e.dataTransfer.files[0]);
+    stop(e);
+    if (e.dataTransfer.files.length > 0) read(e.dataTransfer.files[0]);
 }
 // main
 if ('onhashchange' in window) window.onhashchange = loadFromHash;
@@ -167,20 +165,20 @@ loadFromHash();
 document.ondragover = stop;
 document.ondragleave = stop;
 if ('FileReader' in window && 'readAsBinaryString' in new FileReader()) {
-  file.style.display = 'block';
-  file.onchange = load;
-  document.ondrop = dragAccept;
+    file.style.display = 'block';
+    file.onchange = load;
+    document.ondrop = dragAccept;
 }
 for (var tag in tags) {
-  var date = tags[tag];
-  var el = document.createElement('option');
-  el.value = tag;
-  el.innerText = date + " " + tag;
-  selectTag.appendChild(el);
+    var date = tags[tag];
+    var el = document.createElement('option');
+    el.value = tag;
+    el.innerText = date + " " + tag;
+    selectTag.appendChild(el);
 }
 selectTag.onchange = function (ev) {
-  var tag = ev.target.selectedOptions[0].value;
-  window.location.href = 'https://rawcdn.githack.com/lapo-luchini/asn1js/' + tag + '/index.html'
-}
+    var tag = ev.target.selectedOptions[0].value;
+    window.location.href = 'https://rawcdn.githack.com/lapo-luchini/asn1js/' + tag + '/index.html';
+};
 
 });
diff --git a/package.json b/package.json
index 570b94c..ac33eb4 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
   "homepage": "https://lapo.it/asn1js/",
   "files": [ "asn1.js", "base64.js", "hex.js", "int10.js", "oids.js" ],
   "scripts" : {
-    "lint" : "npx eslint asn1.js base64.js hex.js int10.js oids.js index.js parseRFC.js dumpASN1.js",
+    "lint" : "npx eslint asn1.js base64.js hex.js int10.js oids.js tags.js index.js parseRFC.js dumpASN1.js",
     "test" : "node test"
   },
   "devDependencies": {
@@ -52,6 +52,16 @@
         "rules": {
           "indent": "off"
         }
+      }, {
+        "files": [ "oids.js" ],
+        "rules": {
+          "indent": "off"
+        }
+      }, {
+        "files": [ "tags.js" ],
+        "rules": {
+          "comma-dangle": [ "error", "always-multiline" ]
+        }
       }
     ]
   }
diff --git a/release.sh b/release.sh
index e2664bc..4994f70 100755
--- a/release.sh
+++ b/release.sh
@@ -18,9 +18,16 @@ mtn automate tags it.lapo.asn1js | \
       END { print date " " tag }
     '
   done | sort -r | awk -v q='"' '
-    BEGIN { print "var tags = {" }
-    { print "  " q $2 q ":" q $1 q "," }
-    END { print "};" }
+    BEGIN {
+      print "(typeof define != " q "undefined" q " ? define : function (factory) { " q "use strict" q ";";
+      print "    if (typeof module == " q "object" q ") module.exports = factory();";
+      print "    else window.tags = factory();";
+      print "})(function () {";
+      print q "use strict" q ";";
+      print "return {"
+    }
+    { print "    " q $2 q ":" q $1 q "," }
+    END { print "};});" }
   ' > tags.js
 type gsha256sum >/dev/null && SHA256=gsha256sum || SHA256=sha256sum
 $SHA256 -t $FILES | gpg --clearsign > sha256sums.asc
diff --git a/tags.js b/tags.js
index c7aa6a6..e63004d 100644
--- a/tags.js
+++ b/tags.js
@@ -1,11 +1,16 @@
-var tags = {
-  "1.2.4":"2022-11-14",
-  "1.2.3":"2021-10-21",
-  "1.2.2":"2021-10-21",
-  "1.2.1":"2020-09-06",
-  "1.2.0":"2020-07-20",
-  "1.1.0":"2019-07-13",
-  "1.0.2":"2018-08-23",
-  "1.0.1":"2018-08-14",
-  "1.0.0":"2018-08-14",
-};
+(typeof define != "undefined" ? define : function (factory) { "use strict";
+    if (typeof module == "object") module.exports = factory();
+    else window.tags = factory();
+})(function () {
+"use strict";
+return{
+    "1.2.4":"2022-11-14",
+    "1.2.3":"2021-10-21",
+    "1.2.2":"2021-10-21",
+    "1.2.1":"2020-09-06",
+    "1.2.0":"2020-07-20",
+    "1.1.0":"2019-07-13",
+    "1.0.2":"2018-08-23",
+    "1.0.1":"2018-08-14",
+    "1.0.0":"2018-08-14",
+};});