Support importing modules.

module.c

@@ -3,6 +3,7 @@
 #include <Python.h>
 
 #include "third-party/quickjs.h"
+#include "third-party/quickjs-libc.h"
 
 // The data of the type _quickjs.Context.
 typedef struct {
@@ -261,6 +262,8 @@ static PyObject *context_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 		self->context = JS_NewContext(self->runtime);
 		self->has_time_limit = 0;
 		self->time_limit = 0;
+
+		JS_SetModuleLoaderFunc(self->runtime, NULL, js_module_loader, NULL);
 	}
 	return (PyObject *)self;
 }

test_module.js

@@ -0,0 +1,4 @@
+
+export function value() {
+    return 42;
+}

test_quickjs.py

@@ -56,11 +56,17 @@ def test_get(self):
         self.assertEqual(self.context.get("z"), None)
 
     def test_module(self):
-        self.context.module("""   
+        self.context.module("""
+            import { value } from "./test_module.js";
             export function test() {
-                return 42;
+                return value();
             }
+
+            // export to the global context scope.
+            globalThis.test = test;
         """)
+        test = self.context.get("test")
+        self.assertEqual(test(), 42)
 
     def test_error(self):
         with self.assertRaisesRegex(quickjs.JSException, "ReferenceError: missing is not defined"):