repro-10697.ts

function foo(t: any) {
    var $isMobile = t.mobile() !== null;
    if (
        // Apple iOS 3.2-5.1 - Tested on the original iPad (4.3 / 5.0), iPad 2 (4.3), iPad 3 (5.1), original iPhone (3.1), iPhone 3 (3.2), 3GS (4.3), 4 (4.3 / 5.0), and 4S (5.1)
        t.os('iOS') && t.version('iPad')>=4.3 ||
        t.os('iOS') && t.version('iPhone')>=3.1 ||
        t.os('iOS') && t.version('iPod')>=3.1 ||

        // Android 2.1-2.3 - Tested on the HTC Incredible (2.2), original Droid (2.2), HTC Aria (2.1), Google Nexus S (2.3). Functional on 1.5 & 1.6 but performance may be sluggish, tested on Google G1 (1.5)
        // Android 3.1 (Honeycomb)  - Tested on the Samsung Galaxy Tab 10.1 and Motorola XOOM
        // Android 4.0 (ICS)  - Tested on a Galaxy Nexus. Note: transition performance can be poor on upgraded devices
        // Android 4.1 (Jelly Bean)  - Tested on a Galaxy Nexus and Galaxy 7
        ( t.version('Android')>2.1 && t.is('Webkit') ) ||

        // Windows Phone 7-7.5 - Tested on the HTC Surround (7.0) HTC Trophy (7.5), LG-E900 (7.5), Nokia Lumia 800
        t.version('Windows Phone OS')>=7.0 ||

        // Blackberry 7 - Tested on BlackBerry Torch 9810
        // Blackberry 6.0 - Tested on the Torch 9800 and Style 9670
        t.is('BlackBerry') && t.version('BlackBerry')>=6.0 ||
        // Blackberry Playbook (1.0-2.0) - Tested on PlayBook
        t.match('Playbook.*Tablet') ||

        // Palm WebOS (1.4-2.0) - Tested on the Palm Pixi (1.4), Pre (1.4), Pre 2 (2.0)
        ( t.version('webOS')>=1.4 && t.match('Palm|Pre|Pixi') ) ||
        // Palm WebOS 3.0  - Tested on HP TouchPad
        t.match('hp.*TouchPad') ||

        // Firefox Mobile (12 Beta) - Tested on Android 2.3 device
        ( t.is('Firefox') && t.version('Firefox')>=12 ) ||

        // Chrome for Android - Tested on Android 4.0, 4.1 device
        ( t.is('Chrome') && t.is('AndroidOS') && t.version('Android')>=4.0 ) ||

        // Skyfire 4.1 - Tested on Android 2.3 device
        ( t.is('Skyfire') && t.version('Skyfire')>=4.1 && t.is('AndroidOS') && t.version('Android')>=2.3 ) ||

        // Opera Mobile 11.5-12: Tested on Android 2.3
        ( t.is('Opera') && t.version('Opera Mobi')>11 && t.is('AndroidOS') ) ||

        // Meego 1.2 - Tested on Nokia 950 and N9
        t.is('MeeGoOS') ||

        // Tizen (pre-release) - Tested on early hardware
        t.is('Tizen') ||

        // Samsung Bada 2.0 - Tested on a Samsung Wave 3, Dolphin browser
        // @todo: more tests here!
        t.is('Dolfin') && t.version('Bada')>=2.0 ||

        // UC Browser - Tested on Android 2.3 device
        ( (t.is('UC Browser') || t.is('Dolfin')) && t.version('Android')>=2.3 ) ||

        // Kindle 3 and Fire  - Tested on the built-in WebKit browser for each
        ( t.match('Kindle Fire') ||
            t.is('Kindle') && t.version('Kindle')>=3.0 ) ||

        // Nook Color 1.4.1 - Tested on original Nook Color, not Nook Tablet
        t.is('AndroidOS') && t.is('NookTablet') ||

        // Chrome Desktop 11-21 - Tested on OS X 10.7 and Windows 7
        t.version('Chrome')>=11 && !$isMobile ||

        // Safari Desktop 4-5 - Tested on OS X 10.7 and Windows 7
        t.version('Safari')>=5.0 && !$isMobile ||

        // Firefox Desktop 4-13 - Tested on OS X 10.7 and Windows 7
        t.version('Firefox')>=4.0 && !$isMobile ||

        // Internet Explorer 7-9 - Tested on Windows XP, Vista and 7
        t.version('MSIE')>=7.0 && !$isMobile ||

        // Opera Desktop 10-12 - Tested on OS X 10.7 and Windows 7
        // @reference: http://my.opera.com/community/openweb/idopera/
        t.version('Opera')>=10 && !$isMobile

        ){
        return 'A';
    }

    return 'C';
}

yep. that is correct.