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node_modules/@expo/dom-webview/ios/DomWebViewRegistry.swift

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+// Copyright 2015-present 650 Industries. All rights reserved.
+
+private let lockQueue = DispatchQueue(label: "expo.modules.domWebView.RegistryQueue")
+
+internal typealias WebViewId = Int
+
+internal final class DomWebViewRegistry {
+  static var shared = DomWebViewRegistry()
+
+  private var registry: [WebViewId: WeakDomWebViewRef] = [:]
+  private var nextWebViewId: WebViewId = 0
+
+  func get(webViewId: WebViewId) -> DomWebView? {
+    return lockQueue.sync {
+      return self.registry[webViewId]?.ref
+    }
+  }
+
+  func add(webView: DomWebView) -> WebViewId {
+    return lockQueue.sync {
+      let webViewId = self.nextWebViewId
+      self.registry[webViewId] = WeakDomWebViewRef(ref: webView)
+      self.nextWebViewId += 1
+      return webViewId
+    }
+  }
+
+  @discardableResult
+  func remove(webViewId: WebViewId) -> DomWebView? {
+    return lockQueue.sync {
+      return self.registry.removeValue(forKey: webViewId)?.ref
+    }
+  }
+
+  func reset() {
+    lockQueue.sync {
+      self.registry.removeAll()
+      self.nextWebViewId = 0
+    }
+  }
+}