1 files changed, 7 insertions, 3 deletions

diff --git a/quickjs.c b/quickjs.c
index 45b0be8..43dbe34 100644
--- a/quickjs.c
+++ b/quickjs.c
@@ -9081,15 +9081,19 @@ int JS_DefineProperty(JSContext *ctx, JSValueConst this_obj,
                                spaces. */
                             if (!js_same_value(ctx, val, *pr->u.var_ref->pvalue))
                                 goto not_configurable;
+                        } else {
+                            /* update the reference */
+                            set_value(ctx, pr->u.var_ref->pvalue,
+                                      JS_DupValue(ctx, val));
                         }
-                        /* update the reference */
-                        set_value(ctx, pr->u.var_ref->pvalue,
-                                  JS_DupValue(ctx, val));
                     }
                     /* if writable is set to false, no longer a
                        reference (for mapped arguments) */
                     if ((flags & (JS_PROP_HAS_WRITABLE | JS_PROP_WRITABLE)) == JS_PROP_HAS_WRITABLE) {
                         JSValue val1;
+                        if (p->class_id == JS_CLASS_MODULE_NS) {
+                            return JS_ThrowTypeErrorOrFalse(ctx, flags, "module namespace properties have writable = false");
+                        }
                         if (js_shape_prepare_update(ctx, p, &prs))
                             return -1;
                         val1 = JS_DupValue(ctx, *pr->u.var_ref->pvalue);