How to identify whether SPFx web part is running in web browser or in Teams client

As you probably know it is possible to add Sharepoint Online page as a tab to Team’s channel so it will be shown inside Teams: both when you access it from web browser via https://teams.microsoft.com or from native client (desktop or mobile). It may be needed to identify from where exactly Teams are accessed in order to provide better user experience for this particular client (e.g. add extra css, use different caching mechanisms, etc). In order to do that we may inspect User-Agent header (navigator.userAgent in Typescript) for different clients. In the following table I summarized values of User-Agent header for mentioned scenarios:

Accessed from	User agent
Desktop browser (Chrome)	Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36
Mobile browser (Chrome on Android)	Mozilla/5.0 (Linux; Android 10; …) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.81 Mobile Safari/537.36
Teams web client in desktop browser (Chrome)	Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36 SPTeamsWeb
Teams web client in mobile browser (Safari on iPad). Chrome mobile browser on Android and Safari on iPhone are not supported browsers for Teams web client	Mozilla/5.0 (Macintosh; Intel Mac OS X …) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1.1 Safari/605.1.15 SPTeamsWeb
Teams native desktop client	Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Teams/1.3.00.21759 Chrome/69.0.3497.128 Electron/4.2.12 Safari/537.36
Teams native mobile client (Android)	Mozilla/5.0 (Linux; Android 10; …) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/85.0.4183.81 Mobile Safari/537.36 TeamsMobile-Android
Teams native mobile client (iPhone)	Mozilla/5.0 (iPhone; CPU iPhone OS … like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 TeamsMobile-iOS
Teams native mobile client (iPad)	Mozilla/5.0 (iPad; CPU OS … like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 TeamsMobile-iOS

Those parts which allow to identify current client type are highlighted by bold font. I.e. if we have TeamsMobile-Android or TeamsMobile-iOS in User-Agent it means that SPFx is running in Teams native mobile client. If we have SPTeamsWeb – web part is running in web client.