Package.swift

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+// swift-tools-version:5.0
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+import PackageDescription
+
+let package = Package(
+  name: "nlohmann_json",
+  products: [
+    .library(
+      name: "nlohmann_json",
+      targets: ["nlohmann_json"]
+    )
+  ],
+
+  targets: [
+    .target(
+      name: "nlohmann_json",
+      path: ".",
+      sources: [
+      	"spm_build.cc"
+      ],
+      publicHeadersPath: "single_include"
+    )
+  ]
+)

nlohmann_json.podspec

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+# Below is copied from existing podspec in official cocoapods repo, with added
+# platform support for macOS and tvOS.
+
+# ---- Original podspec begins here
+
+# upgrades how to:
+# 1. update s.version
+# 2. run `pod spec lint nlohmann_json.podspec`
+# 3. register a session with cocoapods
+# 4. run `pod trunk push ./`
+
+# see cocoapods documentation http://docs.cocoapods.org/specification.html for
+# more details.
+Pod::Spec.new do |s|
+
+  # ―――  Spec Metadata  ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――― #
+  s.name         = "nlohmann_json"
+  s.version      = "3.9.1"
+  s.summary      = "JSON for Modern C++"
+
+
+  # CocoaPods strips indentation for description
+  s.description  = <<-DESC
+    JSON library for modern c++, it can read & write JSON. If you know how to
+    use std::vector or std::map, you are already set.
+                   DESC
+
+  s.homepage     = "https://github.com/nlohmann/json"
+  s.screenshots  = "https://raw.githubusercontent.com/nlohmann/json/master/doc/json.gif"
+
+
+  license_text = File.read("LICENSE.MIT")
+  # cocoapods checks extension and expects it to be a txt. so instead
+  # we read the file and pass it in as text.
+  s.license      = { :type => "MIT", :text => license_text }
+
+
+  s.authors      = {
+    "Niels Lohmann" => "mail@nlohmann.me"
+  }
+
+  s.platform     = :ios, "8.0"
+
+  # Below is where it is changed for firebase.
+  s.ios.deployment_target = "8.0"
+  s.osx.deployment_target = "10.7"
+  s.tvos.deployment_target = "9.0"
+  # Firebase change ends here.
+
+  s.source       = { :git => "https://github.com/nlohmann/json.git", :tag => "v#{s.version}" }
+
+  s.source_files = "single_include/**/*.hpp"
+  s.public_header_files = "single_include/nlohmann/json.hpp"
+end

spm_build.cc

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+#include <utility>