Add regression tests for TypeBox resolution in register-loader

Author: ofriw

tests/unit/register-loader.test.ts

@@ -55,3 +55,71 @@ test("register-loader errors when entry file does not exist", () => {
 		rmSync(cwd, { recursive: true, force: true });
 	}
 });
+
+test("register-loader resolves typebox exports from the project dependency tree", () => {
+	const cwd = mkdtempSync(resolve(tmpdir(), "pi-agenticoding-loader-typebox-"));
+	try {
+		const result = spawnSync(
+			process.execPath,
+			[
+				"--import",
+				REGISTER_LOADER,
+				"--input-type=module",
+				"-e",
+				[
+					'const specifiers = ["typebox", "typebox/compile", "typebox/value"];',
+					"const mods = await Promise.all(specifiers.map((specifier) => import(specifier)));",
+					'if (typeof mods[0].Type.String !== "function") process.exit(1);',
+					"console.log(JSON.stringify(Object.fromEntries(specifiers.map((specifier) => [specifier, import.meta.resolve(specifier)]))));",
+				].join("\n"),
+			],
+			{
+				cwd,
+				encoding: "utf8",
+				env: { ...process.env, NODE_OPTIONS: "" },
+			},
+		);
+
+		assert.equal(result.status, 0, result.stderr || result.stdout);
+		const resolved = JSON.parse(result.stdout.trim()) as Record<string, string>;
+		const [rootSpecifier, ...subpathSpecifiers] = Object.keys(resolved);
+		const typeboxRoot = resolved[rootSpecifier].replace(/(?:build\/)?index\.m?js$/, "");
+		assert.match(typeboxRoot, /^file:/);
+		for (const specifier of Object.keys(resolved)) {
+			assert.match(resolved[specifier], /^file:/);
+			assert.ok(
+				resolved[specifier].startsWith(typeboxRoot),
+				`${specifier} should resolve from the same typebox package root`,
+			);
+		}
+		assert.ok(subpathSpecifiers.length > 0);
+	} finally {
+		rmSync(cwd, { recursive: true, force: true });
+	}
+});
+
+test("register-loader surfaces a clear error for missing typebox exports", () => {
+	const cwd = mkdtempSync(resolve(tmpdir(), "pi-agenticoding-loader-typebox-missing-"));
+	try {
+		const result = spawnSync(
+			process.execPath,
+			[
+				"--import",
+				REGISTER_LOADER,
+				"--input-type=module",
+				"-e",
+				'await import("typebox/not-real");',
+			],
+			{
+				cwd,
+				encoding: "utf8",
+				env: { ...process.env, NODE_OPTIONS: "" },
+			},
+		);
+
+		assert.notEqual(result.status, 0, "should exit non-zero for missing typebox export");
+		assert.match(result.stderr, /Cannot find typebox\/not-real export/);
+	} finally {
+		rmSync(cwd, { recursive: true, force: true });
+	}
+});