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node_modules/expo-keep-awake/ios/KeepAwakeModule.swift

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+// Copyright 2021-present 650 Industries. All rights reserved.
+
+import ExpoModulesCore
+
+public final class KeepAwakeModule: Module {
+  private var activeTags = Set<String>()
+
+  public func definition() -> ModuleDefinition {
+    Name("ExpoKeepAwake")
+
+    AsyncFunction("activate") { (tag: String) -> Bool in
+      if self.activeTags.isEmpty {
+        setActivated(true)
+      }
+      self.activeTags.insert(tag)
+      return true
+    }
+
+    AsyncFunction("deactivate") { (tag: String) -> Bool in
+      self.activeTags.remove(tag)
+      if self.activeTags.isEmpty {
+        setActivated(false)
+      }
+      return true
+    }
+
+    AsyncFunction("isActivated") { () -> Bool in
+      #if os(iOS) || os(tvOS)
+      return DispatchQueue.main.sync {
+        return UIApplication.shared.isIdleTimerDisabled
+      }
+      #elseif os(macOS)
+      return false
+      #endif
+    }
+
+    OnAppEntersForeground {
+      if !self.activeTags.isEmpty {
+        setActivated(true)
+      }
+    }
+
+    OnAppEntersBackground {
+      if !self.activeTags.isEmpty {
+        setActivated(false)
+      }
+    }
+  }
+}
+
+private func setActivated(_ activated: Bool) {
+  #if os(iOS) || os(tvOS)
+  DispatchQueue.main.async {
+    UIApplication.shared.isIdleTimerDisabled = activated
+  }
+  #endif
+}