Prohibit freezing/sealing module namespace objects (#160)

Author: bnoordhuis

quickjs.c

@@ -35101,14 +35101,19 @@ static JSValue js_object_seal(JSContext *ctx, JSValueConst this_val,
     if (!JS_IsObject(obj))
         return js_dup(obj);
 
+    p = JS_VALUE_GET_OBJ(obj);
+    if (p->class_id == JS_CLASS_MODULE_NS) {
+        return JS_ThrowTypeError(ctx, "cannot %s module namespace",
+                                 freeze_flag ? "freeze" : "seal");
+    }
+
     res = JS_PreventExtensions(ctx, obj);
     if (res < 0)
         return JS_EXCEPTION;
     if (!res) {
         return JS_ThrowTypeError(ctx, "proxy preventExtensions handler returned false");
     }
 
-    p = JS_VALUE_GET_OBJ(obj);
     flags = JS_GPN_STRING_MASK | JS_GPN_SYMBOL_MASK;
     if (JS_GetOwnPropertyNamesInternal(ctx, &props, &len, p, flags))
         return JS_EXCEPTION;

test262_errors.txt

@@ -139,7 +139,6 @@ test262/test/language/expressions/logical-assignment/left-hand-side-private-refe
 test262/test/language/expressions/optional-chaining/optional-call-preserves-this.js:21: TypeError: cannot read property 'c' of undefined
 test262/test/language/expressions/optional-chaining/optional-call-preserves-this.js:15: strict mode: TypeError: cannot read property '_b' of undefined
 test262/test/language/global-code/script-decl-lex-var-declared-via-eval-sloppy.js:13: Test262Error: variable Expected a SyntaxError to be thrown but no exception was thrown at all
-test262/test/language/module-code/namespace/internals/define-own-property.js:30: Test262Error: Object.freeze: 1 Expected a TypeError to be thrown but no exception was thrown at all
 test262/test/language/statements/async-generator/yield-star-promise-not-unwrapped.js:25: TypeError: $DONE() not called
 test262/test/language/statements/async-generator/yield-star-promise-not-unwrapped.js:25: strict mode: TypeError: $DONE() not called
 test262/test/language/statements/async-generator/yield-star-return-then-getter-ticks.js:131: TypeError: $DONE() not called