Initial flame_lua_runtime package

lib/runtime/models/runtime_event.dart

@@ -0,0 +1,64 @@
+class RuntimeEvent {
+  const RuntimeEvent({
+    required this.type,
+    this.target,
+    this.handler,
+    this.x,
+    this.y,
+    this.data = const {},
+    this.sessionId,
+    this.scope,
+    this.targetEpoch,
+    this.scopeEpoch,
+  });
+
+  final String type;
+  final String? target;
+  final String? handler;
+  final double? x;
+  final double? y;
+  final Map<String, Object?> data;
+
+  /// Runtime-internal lifecycle session. Not exposed to Lua.
+  final int? sessionId;
+
+  /// Runtime-internal lifecycle scope. Not exposed to Lua.
+  final String? scope;
+
+  /// Runtime-internal target node epoch. Not exposed to Lua.
+  final int? targetEpoch;
+
+  /// Runtime-internal scope node epoch. Not exposed to Lua.
+  final int? scopeEpoch;
+
+  RuntimeEvent withLifecycle({
+    int? sessionId,
+    String? scope,
+    int? targetEpoch,
+    int? scopeEpoch,
+  }) {
+    return RuntimeEvent(
+      type: type,
+      target: target,
+      handler: handler,
+      x: x,
+      y: y,
+      data: data,
+      sessionId: sessionId ?? this.sessionId,
+      scope: scope ?? this.scope,
+      targetEpoch: targetEpoch ?? this.targetEpoch,
+      scopeEpoch: scopeEpoch ?? this.scopeEpoch,
+    );
+  }
+
+  Map<String, Object?> toMap() {
+    return {
+      'type': type,
+      if (target != null) 'target': target,
+      if (handler != null) 'handler': handler,
+      if (x != null) 'x': x,
+      if (y != null) 'y': y,
+      if (data.isNotEmpty) 'data': data,
+    };
+  }
+}