Add a reference resolution benchmark for a baseline

Author: airhorns

bench/create-references.benchmark.ts

@@ -0,0 +1,39 @@
+import { benchmarker } from "./benchmark";
+import { State } from "../spec/fixtures/StateChart";
+
+export default benchmarker(async (suite) => {
+  suite
+    .add("instantiating one reference", function () {
+      State.createReadOnly({
+        id: "root",
+        childStates: [{ id: "child" }],
+        initialChildState: "child",
+      });
+    })
+    .add("instantiating deep references", function () {
+      State.createReadOnly({
+        id: "root",
+        childStates: [
+          {
+            id: "one",
+            childStates: [{ id: "alpha" }, { id: "beta" }, { id: "gamma", childStates: [{ id: "foxtrot" }], initialChildState: "foxtrot" }],
+            initialChildState: "beta",
+          },
+          {
+            id: "two",
+            childStates: [{ id: "red" }, { id: "blue" }, { id: "green", childStates: [{ id: "apple" }], initialChildState: "apple" }],
+            initialChildState: "blue",
+          },
+          {
+            id: "three",
+            childStates: [{ id: "soft" }, { id: "rough" }, { id: "bumpy", childStates: [{ id: "smelly" }], initialChildState: "smelly" }],
+            initialChildState: "bumpy",
+          },
+          { id: "four" },
+        ],
+        initialChildState: "three",
+      });
+    });
+
+  return suite;
+});

spec/fixtures/StateChart.ts

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+import type { IAnyClassModelType } from "../../src";
+import { types } from "../../src";
+import { ClassModel, register } from "../../src/class-model";
+
+// eslint-disable-next-line prefer-const
+export let State: IAnyClassModelType;
+@register
+class StateChartState extends ClassModel({
+  id: types.identifier,
+  childStates: types.array(types.late(() => State)),
+  initialChildState: types.maybe(types.reference(types.late(() => State))),
+}) {}
+State = StateChartState;