fix loading node modules in ESM

packages/kit/src/api/dev/loader.js

@@ -17,7 +17,7 @@ export default function loader(sp) {
 			return load(pathname, url_stack);
 		}
 
-		return import(imported);
+		return load_node(imported);
 	};
 
 	const invalidate_all = (path) => {
@@ -34,6 +34,13 @@ export default function loader(sp) {
 		if (url) invalidate_all(url);
 	});
 
+	async function load_node(source) {
+		return {
+			exports: await import(source),
+			css: []
+		};
+	}
+
 	async function load(url, url_stack) {
 		if (url_stack.includes(url)) {
 			console.warn(`Circular dependency: ${url_stack.join(' -> ')} -> ${url}`);

test/apps/basics/src/routes/node/__tests__.js

@@ -0,0 +1,10 @@
+import * as assert from 'uvu/assert';
+
+export default function (test) {
+	test('allow import from node', async ({ visit, js }) => {
+		if (!js) {
+			const response = await visit('/node');
+			assert.ok(response.ok(), 'Should not have server error');
+		}
+	});
+}

test/apps/basics/src/routes/node/index.js

@@ -0,0 +1,7 @@
+import os from 'os';
+
+export function get() {
+	return {
+		body: typeof os.arch()
+	};
+}