deploy Syncer to a2acloud Kubernetes

packages/engine/src/define-game.ts

@@ -0,0 +1,38 @@
+import { PredictedEngine } from "./client.js";
+import { AuthoritativeEngine, type ServerEngineOptions } from "./server.js";
+import type { GameDefinition } from "./types.js";
+
+export interface DefinedGame<State, Input>
+  extends GameDefinition<State, Input> {
+  createServer(options?: ServerEngineOptions): AuthoritativeEngine<State, Input>;
+  createClient(): PredictedEngine<State, Input>;
+}
+
+export function defineGame<State, Input>(
+  definition: GameDefinition<State, Input>,
+): DefinedGame<State, Input> {
+  if (!Number.isInteger(definition.tickRateHz) || definition.tickRateHz <= 0) {
+    throw new RangeError("tickRateHz must be a positive integer");
+  }
+
+  if (
+    !Number.isInteger(definition.snapshotRateHz) ||
+    definition.snapshotRateHz <= 0 ||
+    definition.snapshotRateHz > definition.tickRateHz ||
+    definition.tickRateHz % definition.snapshotRateHz !== 0
+  ) {
+    throw new RangeError(
+      "snapshotRateHz must be a positive divisor of tickRateHz",
+    );
+  }
+
+  return Object.freeze({
+    ...definition,
+    createServer(options?: ServerEngineOptions) {
+      return new AuthoritativeEngine(definition, options);
+    },
+    createClient() {
+      return new PredictedEngine(definition);
+    },
+  });
+}