Compile under Node v12.

package.json

@@ -13,15 +13,15 @@
       , "node"
       , "native"
   ]
-  , "engines": { "node": ">=0.6.0 <0.13" }
+  , "engines": { "node": ">= 11.7.0" }
   , "main": "./lib/rrd"
   , "scripts": {
       "test": "cd test; make"
   }
   , "dependencies": {
       "bindings": "*"
     , "arguee": ">=0.0.2"
-    , "nan": ">=2.0.9"
+    , "nan": ">=2.14.1"
   }
   , "devDependencies": {
       "mocha": ">=1.3.0"

src/node_rrd.h

@@ -60,15 +60,15 @@ class AsyncInfos {
 
 /* Some useful macros to extract arguments */
 #define SET_CHARS_ARG(I, VAR)                                           \
-    String::Utf8Value _chars ## I(info[I]->ToString());                 \
+    Nan::Utf8String _chars ## I (info[I]);                              \
     VAR = strndup(*_chars ## I, _chars ## I.length());
 
 #define SET_ARGC_ARGV_ARG(I, VAR_ARGC, VAR_ARGV)                        \
     Local<Array> argv ## I = Local<Array>::Cast(info[I]);               \
     VAR_ARGC = argv ## I->Length();                                     \
     VAR_ARGV = (char**)malloc(sizeof(char*) * VAR_ARGC);                \
     for (int i = 0; i < VAR_ARGC; i++) {                                \
-        String::Utf8Value arg(argv ## I->Get(i));                       \
+        Nan::Utf8String arg(argv ## I->Get(i));                       \
         VAR_ARGV[i] = strndup(*arg, arg.length());                      \
     }
 

src/node_rrd_fetch.cc

@@ -138,8 +138,8 @@ static void async_after(uv_work_t *req) {
 Local<Object> current_data_to_object(unsigned long ds_cnt, char ** ds_namv, rrd_value_t *data) {
     Nan::EscapableHandleScope scope;
 
-    auto obj = ObjectTemplate::New();
-    auto result = obj->NewInstance();
+    auto obj = ObjectTemplate::New(v8::Isolate::GetCurrent());
+    auto result = obj->NewInstance(Nan::GetCurrentContext()).ToLocalChecked();
 
     unsigned long ii;
     rrd_value_t *datai;

src/node_rrd_info.cc

@@ -83,8 +83,8 @@ static void async_after(uv_work_t *req) {
 static Local<Object>info_data_to_object(rrd_info_t *data) {
     Nan::EscapableHandleScope scope;
 
-    auto info = ObjectTemplate::New();
-    auto instance = info->NewInstance();
+    auto info = ObjectTemplate::New(v8::Isolate::GetCurrent());
+    auto instance = info->NewInstance(Nan::GetCurrentContext()).ToLocalChecked();
 
     while (data) {
          v8::Local<v8::String> key = Nan::New<String>(data->key).ToLocalChecked();