fix(javascript): preserve semantic uncertainty and lexical ownership

src/domain/javascript/javascriptSemanticFingerprints.test.ts

@@ -0,0 +1,31 @@
+import { expect, it } from "vitest";
+
+import { analyzeJavaScriptSemantics } from "./javascriptSemanticAnalysis.js";
+
+const normalizedSyntaxFingerprint = (source: string): string => {
+  const [fingerprint] = analyzeJavaScriptSemantics(source).functionFingerprints;
+  expect(fingerprint?.status).toBe("complete");
+  return fingerprint?.components.normalizedAstSha256 ?? "";
+};
+
+it("distinguishes yielding an iterator result from delegating to the iterator", () => {
+  expect(
+    normalizedSyntaxFingerprint("function* sample(gen) { yield* gen(); }"),
+  ).not.toBe(
+    normalizedSyntaxFingerprint("function* sample(gen) { yield gen(); }"),
+  );
+});
+
+it("distinguishes returned prefix and postfix updates", () => {
+  expect(
+    normalizedSyntaxFingerprint("function sample(i) { return ++i; }"),
+  ).not.toBe(normalizedSyntaxFingerprint("function sample(i) { return i++; }"));
+});
+
+it("keeps formatting and local renames normalized", () => {
+  expect(
+    normalizedSyntaxFingerprint(
+      "function renamed(value) {\n return value++ ;\n }",
+    ),
+  ).toBe(normalizedSyntaxFingerprint("function sample(i) { return i++; }"));
+});