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node_modules/expo/ios/Fetch/ResponseSink.swift

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+// Copyright 2015-present 650 Industries. All rights reserved.
+
+/**
+ A data structure to store response body chunks
+ */
+internal final class ResponseSink {
+  private var bodyQueue: [Data] = []
+  private var isFinalized = false
+  private(set) var bodyUsed = false
+
+  func appendBufferBody(data: Data) {
+    bodyUsed = true
+    bodyQueue.append(data)
+  }
+
+  func finalize() -> Data {
+    let size = bodyQueue.reduce(0) { $0 + $1.count }
+    var result = Data(capacity: size)
+    while !bodyQueue.isEmpty {
+      let data = bodyQueue.removeFirst()
+      result.append(data)
+    }
+    bodyUsed = true
+    isFinalized = true
+    return result
+  }
+}