Add dependency injection

ios/Native/Application/Shared/Emitter/Emitter.swift

@@ -9,14 +9,16 @@ import Combine
 import React
 
 @objc(Emitter)
-class Emitter: RCTEventEmitter {
+class Emitter: RCTEventEmitter, MessageEmitter {
+  @Injected private var eventEmitter: EventEmitter
+  
   override static func requiresMainQueueSetup() -> Bool {
     return true
   }
   
   override init() {
     super.init()
-    EventEmitter.sharedInstance.register(eventEmitter: self)
+    eventEmitter.register(eventEmitter: self)
   }
   
   override func supportedEvents() -> [String]! {

ios/Native/Application/Shared/Emitter/EventEmitter.swift

@@ -7,22 +7,34 @@
 
 import Foundation
 
-class EventEmitter {
-  static let sharedInstance = EventEmitter()
+protocol MessageEmitter {
+  func send(message: String)
+}
 
-  private var eventEmitter: Emitter?
+class NullMessageEmitter: MessageEmitter {
+  func send(message: String) {
+    print("Warning: Emiter is not ready yet")
+  }
+}
 
-  private init() {}
+
+protocol EventEmitter {
+  func send(message: String)
+  func register(eventEmitter: Emitter)
+}
+
+class DefaultEventEmitter: EventEmitter {
+  private var eventEmitter: MessageEmitter = NullMessageEmitter()
 
   func register(eventEmitter: Emitter) {
     self.eventEmitter = eventEmitter
   }
 
   func send(message: String) {
-    eventEmitter?.send(message: message)
+    eventEmitter.send(message: message)
   }
 
   var isReady: Bool {
-    return eventEmitter != nil
+    return (eventEmitter is NullMessageEmitter) == false
   }
 }

ios/Native/Application/Shared/SharedState.swift

@@ -13,12 +13,12 @@ import ReactAppDependencyProvider
 
 final class SharedState: ObservableObject {
   var reactNativeFactory: RCTReactNativeFactory?
-  private let emitter = EventEmitter.sharedInstance
+  let container = DependencyContainer()
   
   // SwiftUI => RN => SwiftUI
   @Published var message: String = ""
   
-  func send(message: String) {
-    emitter.send(message: message)
+  init() {
+    container.register(EventEmitter.self) { _ in DefaultEventEmitter() }
   }
 }