[Videos] Add iOS function to set `AVAudioSession.CategoryOptions` to `.mixWithOthers` (#4905)

* audio mixing pref

* lint

modules/expo-bluesky-swiss-army/ios/PlatformInfo/ExpoPlatformInfoModule.swift

@@ -7,5 +7,15 @@ public class ExpoPlatformInfoModule: Module {
     Function("getIsReducedMotionEnabled") {
       return UIAccessibility.isReduceMotionEnabled
     }
+
+    Function("setAudioMixWithOthers") { (mixWithOthers: Bool) in
+      var options: AVAudioSession.CategoryOptions
+      if mixWithOthers {
+        options = [.mixWithOthers]
+      } else {
+        options = []
+      }
+      try? AVAudioSession.sharedInstance().setCategory(AVAudioSession.Category.playback, mode: .default, options: options)
+    }
   }
 }

modules/expo-bluesky-swiss-army/src/PlatformInfo/index.native.ts

@@ -1,3 +1,4 @@
+import {Platform} from 'react-native'
 import {requireNativeModule} from 'expo-modules-core'
 
 const NativeModule = requireNativeModule('ExpoPlatformInfo')
@@ -5,3 +6,8 @@ const NativeModule = requireNativeModule('ExpoPlatformInfo')
 export function getIsReducedMotionEnabled(): boolean {
   return NativeModule.getIsReducedMotionEnabled()
 }
+
+export function setAudioMixWithOthers(mixWithOthers: boolean): void {
+  if (Platform.OS !== 'ios') return
+  NativeModule.setAudioMixWithOthers(mixWithOthers)
+}

modules/expo-bluesky-swiss-army/src/PlatformInfo/index.ts

@@ -3,3 +3,7 @@ import {NotImplementedError} from '../NotImplemented'
 export function getIsReducedMotionEnabled(): boolean {
   throw new NotImplementedError()
 }
+
+export function setAudioMixWithOthers(mixWithOthers: boolean): void {
+  throw new NotImplementedError({mixWithOthers})
+}

modules/expo-bluesky-swiss-army/src/PlatformInfo/index.web.ts

@@ -1,6 +1,12 @@
+import {NotImplementedError} from '../NotImplemented'
+
 export function getIsReducedMotionEnabled(): boolean {
   if (typeof window === 'undefined') {
     return false
   }
   return window.matchMedia('(prefers-reduced-motion: reduce)').matches
 }
+
+export function setAudioMixWithOthers(mixWithOthers: boolean): void {
+  throw new NotImplementedError({mixWithOthers})
+}