src: modify code for empty string

PR-URL: nodejs#49336
Refs: nodejs#49097
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Debadree Chatterjee <debadree333@gmail.com>

src/node_url.cc

@@ -78,7 +78,7 @@ void BindingData::DomainToASCII(const FunctionCallbackInfo<Value>& args) {
 
   std::string input = Utf8Value(env->isolate(), args[0]).ToString();
   if (input.empty()) {
-    return args.GetReturnValue().Set(FIXED_ONE_BYTE_STRING(env->isolate(), ""));
+    return args.GetReturnValue().Set(String::Empty(env->isolate()));
   }
 
   // It is important to have an initial value that contains a special scheme.
@@ -87,7 +87,7 @@ void BindingData::DomainToASCII(const FunctionCallbackInfo<Value>& args) {
   auto out = ada::parse<ada::url>("ws://x");
   DCHECK(out);
   if (!out->set_hostname(input)) {
-    return args.GetReturnValue().Set(FIXED_ONE_BYTE_STRING(env->isolate(), ""));
+    return args.GetReturnValue().Set(String::Empty(env->isolate()));
   }
   std::string host = out->get_hostname();
   args.GetReturnValue().Set(
@@ -101,8 +101,7 @@ void BindingData::DomainToUnicode(const FunctionCallbackInfo<Value>& args) {
 
   std::string input = Utf8Value(env->isolate(), args[0]).ToString();
   if (input.empty()) {
-    return args.GetReturnValue().Set(
-        String::NewFromUtf8(env->isolate(), "").ToLocalChecked());
+    return args.GetReturnValue().Set(String::Empty(env->isolate()));
   }
 
   // It is important to have an initial value that contains a special scheme.
@@ -111,8 +110,7 @@ void BindingData::DomainToUnicode(const FunctionCallbackInfo<Value>& args) {
   auto out = ada::parse<ada::url>("ws://x");
   DCHECK(out);
   if (!out->set_hostname(input)) {
-    return args.GetReturnValue().Set(
-        String::NewFromUtf8(env->isolate(), "").ToLocalChecked());
+    return args.GetReturnValue().Set(String::Empty(env->isolate()));
   }
   std::string result = ada::unicode::to_unicode(out->get_hostname());