Add a new submodule: ua-parser-helpers with a method: isFrozenUA() to match a string with a frozen user-agent pattern

package.json

@@ -157,6 +157,10 @@
     "./extensions": {
       "require": "./src/extensions/ua-parser-extensions.js",
       "import": "./src/extensions/ua-parser-extensions.mjs"
+    },
+    "./helpers": {
+      "require": "./src/helpers/ua-parser-helpers.js",
+      "import": "./src/helpers/ua-parser-helpers.mjs"
     }
   },
   "files": [

script/build-module.js

@@ -16,6 +16,11 @@ const PATH = {
         src : 'src/extensions/ua-parser-extensions.js',
         dest : 'src/extensions/ua-parser-extensions.mjs',
         title : 'extensions'
+    },
+    helpers : {
+        src : 'src/helpers/ua-parser-helpers.js',
+        dest : 'src/helpers/ua-parser-helpers.mjs',
+        title : 'helpers'
     }
 };
 const generateMJS = (module, replacers) => {
@@ -46,4 +51,7 @@ generateMJS('main', [
 generateMJS('enums', [[/module\.exports =/ig, 'export']]);
 
 // ua-parser-extension.mjs
-generateMJS('extensions', [[/module\.exports =/ig, 'export']]);
+generateMJS('extensions', [[/module\.exports =/ig, 'export']]);
+
+// ua-parser-helpers.mjs
+generateMJS('helpers', [[/module\.exports =/ig, 'export']]);

src/helpers/ua-parser-helpers.js

@@ -0,0 +1,42 @@
+///////////////////////////////////////////////
+/*  Helpers for UAParser.js v2.0.0-alpha.2
+    https://github.com/faisalman/ua-parser-js
+    Author: Faisal Salman <f@faisalman.com>
+    MIT License */
+//////////////////////////////////////////////
+
+/*jshint esversion: 6 */ 
+
+/*
+    # Reference:
+    https://www.chromium.org/updates/ua-reduction/
+
+    # Desktop
+    ---
+    Format:
+    Mozilla/5.0 (<unifiedPlatform>) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/<majorVersion>.0.0.0 Safari/537.36
+
+    Possible <unifiedPlatform> values:
+    - Windows NT 10.0; Win64; x64
+    - Macintosh; Intel Mac OS X 10_15_7
+    - X11; Linux x86_64
+    - X11; CrOS x86_64 14541.0.0
+    - Fuchsia 
+
+    # Mobile & Tablet: (except iOS/Android WebView)
+    ---
+    Format:
+    Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/<majorVersion>.0.0.0 <deviceCompat> Safari/537.36
+    
+    Possible <deviceCompat> values:
+    - "Mobile"
+    - "" (empty string for Tablets & Desktop)
+*/
+
+const frozenUA = /Mozilla\/5\.0 \((Windows NT 10\.0; Win64; x64|Macintosh; Intel Mac OS X 10_15_7|X11; Linux x86_64|X11; CrOS x86_64 14541\.0\.0|Fuchsia|Linux; Android 10; K)\) AppleWebKit\/537\.36 \(KHTML, like Gecko\) Chrome\/\d+\.0\.0\.0 (Mobile )?Safari\/537\.36/;
+
+const isFrozenUA = str => frozenUA.test(str);
+
+module.exports = { 
+    isFrozenUA
+};

test/mocha-test-helpers.js

@@ -0,0 +1,35 @@
+const { isFrozenUA } = require('ua-parser-js/helpers');
+const assert = require('assert');
+
+describe('isFrozenUA', () => {
+    it('Returns whether a user agent is frozen', () => {
+
+        const regularWindowsUA = "Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.1234.56 Safari/537.36";
+        const freezedWindowsUA = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.0.0 Safari/537.36";
+
+        const regularMacUA = "";
+        const freezedMacUA = "";
+
+        const regularLinuxUA = "";
+        const freezedLinuxUA = "";
+
+        const regularCrOSUA = "";
+        const freezedCrOSUA = "";
+
+        const regularFuchsiaUA = "";
+        const freezedFuchsiaUA = "";
+
+	    const regularMobileUA = "Mozilla/5.0 (Linux; Android 9; SM-A205U) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.1234.56 Mobile Safari/537.36";
+        const freezedMobileUA = "Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.0.0 Mobile Safari/537.36";
+
+        const regularTabletUA = "Mozilla/5.0 (Linux; Android 9; SM-T810) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.1234.56 Safari/537.36";
+        const freezedTabletUA = "Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.0.0 Safari/537.36";
+
+        assert.strictEqual(isFrozenUA(regularWindowsUA), false);
+        assert.strictEqual(isFrozenUA(freezedWindowsUA), true);
+        assert.strictEqual(isFrozenUA(regularMobileUA), false);
+        assert.strictEqual(isFrozenUA(freezedMobileUA), true);
+        assert.strictEqual(isFrozenUA(regularTabletUA), false);
+        assert.strictEqual(isFrozenUA(freezedTabletUA), true);
+    });
+});