fix(javascript): handle deep static member paths (#939)

src/domain/javascript/javascriptStaticAnalysis.member_path_depth.test.ts

@@ -0,0 +1,63 @@
+import { expect, it } from "vitest";
+
+import { collectJavaScriptExports } from "./javascriptAstFingerprint.js";
+import { analyzeJavaScriptStaticSource } from "./javascriptStaticAnalysis.js";
+import { parseJavaScriptSource } from "./javascriptSourceParser.js";
+
+const memberChain = ".next".repeat(12_000);
+
+it("collects a 12,000-member CommonJS export path without recursion", () => {
+  const file = parseJavaScriptSource(`exports${memberChain}.last = 1;`);
+  if (file === null) throw new Error("Expected valid JavaScript");
+  expect(collectJavaScriptExports(file).values).toEqual([
+    `${"next.".repeat(12_000)}last`,
+  ]);
+});
+
+it("preserves empty, dynamic, this, and private member path behavior", () => {
+  const file = parseJavaScriptSource(`
+    exports[""].value = 1;
+    exports[""] = 0;
+    exports[key].value = 2;
+    this.exports.ignored = 3;
+    class Example { #private = 0; read() { this.#private = 1; } }
+  `);
+  if (file === null) throw new Error("Expected valid JavaScript");
+  expect(collectJavaScriptExports(file).values).toEqual([
+    "",
+    ".value",
+    "key.value",
+  ]);
+});
+
+it("keeps left-first and outer-member-first bundler runtime matches", () => {
+  const source = `
+    (globalThis.webpackChunkLeft || globalThis.webpackChunkRight).push([[1], { 1: function() {} }]);
+    globalThis.webpackChunkOuter.webpackChunkInner.push([[2], { 2: function() {} }]);
+  `;
+  const analysis = analyzeJavaScriptStaticSource(source);
+  expect(
+    analysis.bundler_registrations.find(({ chunk_keys }) =>
+      chunk_keys.includes("1"),
+    )?.runtime,
+  ).toBe("webpackChunkLeft");
+  expect(
+    analysis.bundler_registrations.find(({ chunk_keys }) =>
+      chunk_keys.includes("2"),
+    )?.runtime,
+  ).toBe("webpackChunkInner");
+});
+
+it("analyzes a 12,000-member bundler runtime chain without recursion", () => {
+  const source = `globalThis.webpackChunkApp${memberChain}.push([[1], { 1: function(module) { module.exports.ok = 42; } }]);`;
+  const analysis = analyzeJavaScriptStaticSource(source);
+  expect(analysis.parse_status).toBe("complete");
+  expect(analysis.parse_error_count).toBe(0);
+  expect(analysis.bundler_registrations).toHaveLength(1);
+  expect(analysis.bundler_registrations[0]).toMatchObject({
+    bundler: "webpack",
+    runtime: "webpackChunkApp",
+    chunk_keys: ["1"],
+    modules: [expect.objectContaining({ exports: ["ok"] })],
+  });
+});