From aa4c57ae7e74a623f5255a7f05a6ff9d5bc335d0 Mon Sep 17 00:00:00 2001
From: Rongjian Zhang <pd4d10@gmail.com>
Date: Sun, 24 Nov 2019 12:40:40 +0800
Subject: module: add warnings for experimental flags

PR-URL: https://github.com/nodejs/node/pull/30617
Fixes: https://github.com/nodejs/node/issues/30600
Reviewed-By: Guy Bedford <guybedford@gmail.com>
---
 src/node_process_events.cc | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'src/node_process_events.cc')

diff --git a/src/node_process_events.cc b/src/node_process_events.cc
index 06096226625..d192ef19b7a 100644
--- a/src/node_process_events.cc
+++ b/src/node_process_events.cc
@@ -1,4 +1,5 @@
 #include <cstdarg>
+#include <set>
 
 #include "env-inl.h"
 #include "node_process.h"
@@ -95,6 +96,21 @@ Maybe<bool> ProcessEmitWarning(Environment* env, const char* fmt, ...) {
   return ProcessEmitWarningGeneric(env, warning);
 }
 
+
+std::set<std::string> experimental_warnings;
+
+Maybe<bool> ProcessEmitExperimentalWarning(Environment* env,
+                                          const char* warning) {
+  if (experimental_warnings.find(warning) != experimental_warnings.end())
+    return Nothing<bool>();
+
+  experimental_warnings.insert(warning);
+  std::string message(warning);
+  message.append(
+      " is an experimental feature. This feature could change at any time");
+  return ProcessEmitWarningGeneric(env, message.c_str(), "ExperimentalWarning");
+}
+
 Maybe<bool> ProcessEmitDeprecationWarning(Environment* env,
                                           const char* warning,
                                           const char* deprecation_code) {
-- 
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