Package Loader Test

1import { test } from "node:test";
2import assert from "node:assert/strict";
3import { spawnSync } from "node:child_process";
4import { copyFileSync, mkdtempSync, rmSync, writeFileSync } from "node:fs";
5import { dirname, join } from "node:path";
6import { tmpdir } from "node:os";
7import { fileURLToPath }