fix: add cross-platform test runner for Node 20 compatibility

Author: Lellansin

package.json

@@ -32,7 +32,7 @@
     "format:check": "prettier --check 'src/**/*.{ts,tsx}'",
     "check": "npm run typecheck && npm run lint && npm run format:check",
     "build": "npm run check && npm run bundle && node -e \"require('fs').chmodSync('dist/cli.js', 0o755)\"",
-    "test": "tsx --test \"src/tests/*.test.ts\"",
+    "test": "node src/tests/run-tests.mjs",
     "test:single": "tsx --test",
     "prepack": "npm run build",
     "prepare": "husky"

src/tests/run-tests.mjs

@@ -0,0 +1,26 @@
+// Cross-platform test runner: finds all *.test.ts files and runs them via tsx.
+// Needed because glob expansion in npm scripts behaves differently across
+// shells and Node versions (particularly Node 20 on Windows).
+/* eslint-disable */
+
+import { spawnSync } from "child_process";
+import { readdirSync } from "fs";
+import { fileURLToPath } from "url";
+import { dirname, join } from "path";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+
+const testFiles = readdirSync(__dirname)
+  .filter((f) => f.endsWith(".test.ts"))
+  .map((f) => join(__dirname, f))
+  .sort();
+
+// Resolve tsx from the project root
+const tsx = new URL("../../node_modules/.bin/tsx", import.meta.url).pathname;
+
+const result = spawnSync(process.execPath, [tsx, "--test", ...testFiles], {
+  stdio: "inherit",
+  cwd: join(__dirname, "../.."),
+});
+
+process.exit(result.status ?? 1);