Apple TV support 1: podspec and code changes for commonly used modules

[douglowder]

Why

First of a series of PRs to add Apple TV support for many (but not all) Expo SDK modules.

This PR makes Apple TV able to compile for apps using react-native-tvos@0.72.4-0 and ONLY the following modules:

• expo
• expo-application
• expo-constants
• expo-eas-client
• expo-file-system
• expo-font
• expo-json-utils
• expo-keep-awake
• expo-manifests
• expo-modules-core
• expo-splash-screen
• expo-structured-headers
• expo-updates-interface
• expo-updates

How

• Add tvOS to podspecs
• Native code changes wrapped in #if TARGET_OS_TV (for Objective C) or #if os(tvOS) (for Swift)
• Import source for the ASN1Decoder Swift framework used by expo-updates, as the public podspec for that framework does not yet support tvOS

Test Plan

• Manual testing with a template still in development
• Existing CI for iOS should pass (nothing should be broken)

Checklist

• Documentation is up to date to reflect these changes (eg: https://docs.expo.dev and README.md).
• Conforms with the Documentation Writing Style Guide
• This diff will work correctly for npx expo prebuild & EAS Build (eg: updated a module plugin).

[linear]

ENG-10042 Add Apple TV support to Expo SDK

Now that React Native TV repo is at 0.72.4, even with core, we can start adding partial support for Apple TV.

Included:

• Support for the modules used in all apps created with create-expo-app
• Support for expo-updates
• Support for expo-av (minus recording features)
• Support for expo-apple-authentication
• Custom template for TV (maybe expo-template-tv)

Possibly included in future:

• expo-router
• expo-dev-client and friends

Excluded:

• Modules specifically for phone features, or web features (no web on Apple TV)
  • expo-camera
  • expo-barcode-scanner
  • expo-battery
  • expo-cellular
  • expo-contacts
  • expo-face-detector
  • expo-haptics
  • expo-local-authentication
  • expo-location
  • expo-screen-capture
  • expo-screen-orientation
  • expo-sensors
  • expo-speech
  • expo-standard-web-crypto
  • expo-status-bar
  • expo-web-browser

[wschurman]

Looking at the commit history and open PRs on the ASN1Decoder repo, I think it's unlikely a PR will get merged and published, but I still think it's worth a shot (in parallel to this PR).

Just a few inline comments. Will defer to others for the higher-level review about tvos since I've never dealt with it.

[douglowder]

Looking at the commit history and open PRs on the ASN1Decoder repo, I think it's unlikely a PR will get merged and published, but I still think it's worth a shot (in parallel to this PR).

PR has been submitted: filom/ASN1Decoder#39

[wschurman]

Agree about adding CI for this in a follow-up. Otherwise this will break pretty quickly since most of us ever build for TV locally.

Approving for my addressed comments, but wait for an approval from @Kudo as well to land as he is more familiar with it.