fix(javascript): avoid positive-zero evidence for signed zero

src/application/javascript/JavaScriptApplicationSignedZero.test.ts

@@ -0,0 +1,26 @@
+import { writeFile } from "node:fs/promises";
+import { join } from "node:path";
+
+import { expect, it } from "vitest";
+
+import { createTestTempDirectory } from "../../../tests/fixtures/temporaryDirectory.js";
+import { javascriptApplicationAnalysisResultSchema } from "../../domain/javascript/javascriptApplicationAnalysis.js";
+import { analyzeJavaScriptApplication } from "./JavaScriptApplicationService.js";
+
+it("does not expose a resolved positive-zero literal for a negative-zero export", async () => {
+  const root = await createTestTempDirectory("rea-signed-zero-");
+  await writeFile(join(root, "app.js"), "export const value = -0;\n");
+  const result = await analyzeJavaScriptApplication({
+    input_path: root,
+    format: "directory",
+  });
+  if (!result.ok) throw result.error;
+  const analysis = javascriptApplicationAnalysisResultSchema.parse(
+    result.value.normalized_result,
+  );
+  expect(
+    analysis.semantic_graph.nodes.filter(
+      ({ kind, properties }) => kind === "literal" && properties.value === 0,
+    ),
+  ).toEqual([]);
+});