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

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);
const ordinaryMemberChain = ".next".repeat(64);

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"]);
});

it("preserves exact empty keys without inventing dynamic, this, or private exports", () => {
  const file = parseJavaScriptSource(`
    exports[""].value = 1;
    exports[""] = 0;
    exports[key].value = 2;
    exports.nested = {};
    exports.nested.child = 3;
    exports["nested.child"] = 4;
    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([
    "",
    "nested",
    "nested.child",
  ]);
});

it("distinguishes the object literal prototype setter from own export keys", () => {
  const prototypeSetter = parseJavaScriptSource(
    "module.exports = { __proto__: {} };",
  );
  const ownKeys = parseJavaScriptSource(
    'module.exports = { ["__proto__"]: 1, __proto__() {} };',
  );
  if (prototypeSetter === null || ownKeys === null)
    throw new Error("Expected valid JavaScript");
  expect(collectJavaScriptExports(prototypeSetter).values).toEqual([]);
  expect(collectJavaScriptExports(ownKeys).values).toEqual(["__proto__"]);
});

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("recognizes a bundler runtime through nested member names", () => {
  const source = `globalThis.webpackChunkApp${ordinaryMemberChain}.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"] })],
  });
});