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Assets/Mirror/CompilerSymbols/Mirror.CompilerSymbols.asmdef

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+{
+    "name": "Mirror.CompilerSymbols",
+    "references": [],
+    "optionalUnityReferences": [],
+    "includePlatforms": [
+        "Editor"
+    ],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": true,
+    "defineConstraints": []
+}

Assets/Mirror/CompilerSymbols/Mirror.CompilerSymbols.asmdef.meta

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+guid: 325984b52e4128546bc7558552f8b1d2
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+  externalObjects: {}
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+  assetBundleVariant: 
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+  serializedVersion: 1
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+  packageVersion: 96.0.1
+  assetPath: Assets/Mirror/CompilerSymbols/Mirror.CompilerSymbols.asmdef
+  uploadId: 736421

Assets/Mirror/CompilerSymbols/PreprocessorDefine.cs

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+using System.Collections.Generic;
+using UnityEditor;
+
+namespace Mirror
+{
+    static class PreprocessorDefine
+    {
+        /// <summary>
+        /// Add define symbols as soon as Unity gets done compiling.
+        /// </summary>
+        [InitializeOnLoadMethod]
+        public static void AddDefineSymbols()
+        {
+#if UNITY_2021_2_OR_NEWER
+            string currentDefines = PlayerSettings.GetScriptingDefineSymbols(UnityEditor.Build.NamedBuildTarget.FromBuildTargetGroup(EditorUserBuildSettings.selectedBuildTargetGroup));
+#else
+            // Deprecated in Unity 2023.1
+            string currentDefines = PlayerSettings.GetScriptingDefineSymbolsForGroup(EditorUserBuildSettings.selectedBuildTargetGroup);
+#endif
+            // Remove oldest when adding next month's symbol.
+            // Keep a rolling 12 months of symbols.
+            HashSet<string> defines = new HashSet<string>(currentDefines.Split(';'))
+            {
+                "MIRROR",
+                "MIRROR_89_OR_NEWER",
+                "MIRROR_90_OR_NEWER",
+                "MIRROR_93_OR_NEWER",
+                "MIRROR_96_OR_NEWER"
+            };
+
+            // only touch PlayerSettings if we actually modified it,
+            // otherwise it shows up as changed in git each time.
+            string newDefines = string.Join(";", defines);
+            if (newDefines != currentDefines)
+            {
+#if UNITY_2021_2_OR_NEWER
+                PlayerSettings.SetScriptingDefineSymbols(UnityEditor.Build.NamedBuildTarget.FromBuildTargetGroup(EditorUserBuildSettings.selectedBuildTargetGroup), newDefines);
+#else
+                // Deprecated in Unity 2023.1
+                PlayerSettings.SetScriptingDefineSymbolsForGroup(EditorUserBuildSettings.selectedBuildTargetGroup, newDefines);
+#endif
+            }
+        }
+    }
+}

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