implement `_nodeModulePaths` and `require.main.paths` (#3411)

* tests in progress

* add `require.main.paths`, add every dir up to root

* remove imports

1 files changed, 19 insertions, 0 deletions

diff --git a/test/js/node/module/node-module-module.test.js b/test/js/node/module/node-module-module.test.js
index 549b5e085..3ced63da1 100644
--- a/test/js/node/module/node-module-module.test.js
+++ b/test/js/node/module/node-module-module.test.js
@@ -1,5 +1,24 @@
 import { expect, test } from "bun:test";
+import { _nodeModulePaths } from "module";
 
 test("module.globalPaths exists", () => {
   expect(Array.isArray(require("module").globalPaths)).toBe(true);
 });
+
+test("_nodeModulePaths() works", () => {
+  expect(() => {
+    _nodeModulePaths();
+  }).toThrow();
+  expect(_nodeModulePaths(".").length).toBeGreaterThan(0);
+  expect(_nodeModulePaths(".").pop()).toBe("/node_modules");
+  expect(_nodeModulePaths("")).toEqual(_nodeModulePaths("."));
+  expect(_nodeModulePaths("/")).toEqual(["/node_modules"]);
+  expect(_nodeModulePaths("/a/b/c/d")).toEqual([
+    "/a/b/c/d/node_modules",
+    "/a/b/c/node_modules",
+    "/a/b/node_modules",
+    "/a/node_modules",
+    "/node_modules",
+  ]);
+  expect(_nodeModulePaths("/a/b/../d")).toEqual(["/a/d/node_modules", "/a/node_modules", "/node_modules"]);
+});