diff --git a/node.gyp b/node.gyp
index 642a9767fb64..30327b38a59d 100644
--- a/node.gyp
+++ b/node.gyp
@@ -749,6 +749,7 @@
         'src/node_perf_common.h',
         'src/node_platform.h',
         'src/node_process.h',
+        'src/node_process-inl.h',
         'src/node_report.h',
         'src/node_revert.h',
         'src/node_root_certs.h',
diff --git a/src/api/hooks.cc b/src/api/hooks.cc
index cb46c5c1b876..c19d8c5b9106 100644
--- a/src/api/hooks.cc
+++ b/src/api/hooks.cc
@@ -1,6 +1,6 @@
 #include "env-inl.h"
 #include "node_internals.h"
-#include "node_process.h"
+#include "node_process-inl.h"
 #include "async_wrap.h"
 
 namespace node {
diff --git a/src/crypto/crypto_cipher.cc b/src/crypto/crypto_cipher.cc
index 5ce466582823..4629143d47e4 100644
--- a/src/crypto/crypto_cipher.cc
+++ b/src/crypto/crypto_cipher.cc
@@ -6,7 +6,7 @@
 #include "memory_tracker-inl.h"
 #include "node_buffer.h"
 #include "node_internals.h"
-#include "node_process.h"
+#include "node_process-inl.h"
 #include "v8.h"
 
 namespace node {
diff --git a/src/env.cc b/src/env.cc
index 28a1c2fd3c36..4ee4b675d879 100644
--- a/src/env.cc
+++ b/src/env.cc
@@ -10,7 +10,7 @@
 #include "node_errors.h"
 #include "node_internals.h"
 #include "node_options-inl.h"
-#include "node_process.h"
+#include "node_process-inl.h"
 #include "node_v8_platform-inl.h"
 #include "node_worker.h"
 #include "req_wrap-inl.h"
diff --git a/src/inspector_agent.cc b/src/inspector_agent.cc
index 4b30c177bea5..a3c901dca2ea 100644
--- a/src/inspector_agent.cc
+++ b/src/inspector_agent.cc
@@ -12,7 +12,7 @@
 #include "node_errors.h"
 #include "node_internals.h"
 #include "node_options-inl.h"
-#include "node_process.h"
+#include "node_process-inl.h"
 #include "node_url.h"
 #include "util-inl.h"
 #include "timer_wrap.h"
diff --git a/src/module_wrap.cc b/src/module_wrap.cc
index ed48c0bc5f45..f45ee7627b0a 100644
--- a/src/module_wrap.cc
+++ b/src/module_wrap.cc
@@ -5,7 +5,7 @@
 #include "node_contextify.h"
 #include "node_errors.h"
 #include "node_internals.h"
-#include "node_process.h"
+#include "node_process-inl.h"
 #include "node_url.h"
 #include "node_watchdog.h"
 #include "util-inl.h"
diff --git a/src/node.cc b/src/node.cc
index bf041fb682a2..3b6d58ea7308 100644
--- a/src/node.cc
+++ b/src/node.cc
@@ -35,7 +35,7 @@
 #include "node_native_module_env.h"
 #include "node_options-inl.h"
 #include "node_perf.h"
-#include "node_process.h"
+#include "node_process-inl.h"
 #include "node_report.h"
 #include "node_revert.h"
 #include "node_v8_platform-inl.h"
diff --git a/src/node_dir.cc b/src/node_dir.cc
index b103c08262a5..c530da0cc3be 100644
--- a/src/node_dir.cc
+++ b/src/node_dir.cc
@@ -1,7 +1,7 @@
 #include "node_dir.h"
 #include "node_external_reference.h"
 #include "node_file-inl.h"
-#include "node_process.h"
+#include "node_process-inl.h"
 #include "memory_tracker-inl.h"
 #include "util.h"
 
diff --git a/src/node_env_var.cc b/src/node_env_var.cc
index b13f7fcd16fd..27c833d498ec 100644
--- a/src/node_env_var.cc
+++ b/src/node_env_var.cc
@@ -3,7 +3,7 @@
 #include "node_errors.h"
 #include "node_external_reference.h"
 #include "node_i18n.h"
-#include "node_process.h"
+#include "node_process-inl.h"
 
 #include <time.h>  // tzset(), _tzset()
 
diff --git a/src/node_errors.cc b/src/node_errors.cc
index 47b13f614954..3aee2533a8c0 100644
--- a/src/node_errors.cc
+++ b/src/node_errors.cc
@@ -5,7 +5,7 @@
 #include "node_errors.h"
 #include "node_external_reference.h"
 #include "node_internals.h"
-#include "node_process.h"
+#include "node_process-inl.h"
 #include "node_report.h"
 #include "node_v8_platform-inl.h"
 #include "util-inl.h"
diff --git a/src/node_file.cc b/src/node_file.cc
index d3bcb8fbd804..3d185983ae45 100644
--- a/src/node_file.cc
+++ b/src/node_file.cc
@@ -24,7 +24,7 @@
 #include "memory_tracker-inl.h"
 #include "node_buffer.h"
 #include "node_external_reference.h"
-#include "node_process.h"
+#include "node_process-inl.h"
 #include "node_stat_watcher.h"
 #include "util-inl.h"
 
diff --git a/src/node_messaging.cc b/src/node_messaging.cc
index ac4abc3af015..7dd18979530b 100644
--- a/src/node_messaging.cc
+++ b/src/node_messaging.cc
@@ -7,7 +7,7 @@
 #include "node_contextify.h"
 #include "node_errors.h"
 #include "node_external_reference.h"
-#include "node_process.h"
+#include "node_process-inl.h"
 #include "util-inl.h"
 
 using node::contextify::ContextifyContext;
diff --git a/src/node_perf.cc b/src/node_perf.cc
index c1a0b2cf3a14..8c5778ecb10b 100644
--- a/src/node_perf.cc
+++ b/src/node_perf.cc
@@ -5,7 +5,7 @@
 #include "node_internals.h"
 #include "node_perf.h"
 #include "node_buffer.h"
-#include "node_process.h"
+#include "node_process-inl.h"
 #include "util-inl.h"
 
 #include <cinttypes>
diff --git a/src/node_process-inl.h b/src/node_process-inl.h
new file mode 100644
index 000000000000..21a448cfdb2a
--- /dev/null
+++ b/src/node_process-inl.h
@@ -0,0 +1,26 @@
+#ifndef SRC_NODE_PROCESS_INL_H_
+#define SRC_NODE_PROCESS_INL_H_
+
+#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
+
+#include "node_process.h"
+#include "v8.h"
+#include "debug_utils-inl.h"
+
+namespace node {
+
+// Call process.emitWarning(str), fmt is a snprintf() format string
+template <typename... Args>
+inline v8::Maybe<bool> ProcessEmitWarning(Environment* env,
+                                          const char* fmt,
+                                          Args&&... args) {
+  std::string warning = SPrintF(fmt, std::forward<Args>(args)...);
+
+  return ProcessEmitWarningGeneric(env, warning.c_str());
+}
+
+}  // namespace node
+
+#endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
+
+#endif  // SRC_NODE_PROCESS_INL_H_
diff --git a/src/node_process.h b/src/node_process.h
index 2e87385348d9..14c8f6591689 100644
--- a/src/node_process.h
+++ b/src/node_process.h
@@ -25,7 +25,10 @@ v8::Maybe<bool> ProcessEmitWarningGeneric(Environment* env,
                                           const char* type = nullptr,
                                           const char* code = nullptr);
 
-v8::Maybe<bool> ProcessEmitWarning(Environment* env, const char* fmt, ...);
+template <typename... Args>
+inline v8::Maybe<bool> ProcessEmitWarning(Environment* env,
+                                          const char* fmt,
+                                          Args&&... args);
 v8::Maybe<bool> ProcessEmitExperimentalWarning(Environment* env,
                                               const char* warning);
 v8::Maybe<bool> ProcessEmitDeprecationWarning(Environment* env,
diff --git a/src/node_process_events.cc b/src/node_process_events.cc
index 0c149b26e334..34f0251cabc0 100644
--- a/src/node_process_events.cc
+++ b/src/node_process_events.cc
@@ -1,8 +1,7 @@
-#include <cstdarg>
 #include <set>
 
 #include "env-inl.h"
-#include "node_process.h"
+#include "node_process-inl.h"
 #include "util.h"
 
 namespace node {
@@ -84,18 +83,6 @@ Maybe<bool> ProcessEmitWarningGeneric(Environment* env,
   return Just(true);
 }
 
-// Call process.emitWarning(str), fmt is a snprintf() format string
-Maybe<bool> ProcessEmitWarning(Environment* env, const char* fmt, ...) {
-  char warning[1024];
-  va_list ap;
-
-  va_start(ap, fmt);
-  vsnprintf(warning, sizeof(warning), fmt, ap);
-  va_end(ap);
-
-  return ProcessEmitWarningGeneric(env, warning);
-}
-
 
 std::set<std::string> experimental_warnings;
 
diff --git a/src/node_process_methods.cc b/src/node_process_methods.cc
index 5030ab872f4f..3bb56458d0eb 100644
--- a/src/node_process_methods.cc
+++ b/src/node_process_methods.cc
@@ -6,7 +6,7 @@
 #include "node_errors.h"
 #include "node_external_reference.h"
 #include "node_internals.h"
-#include "node_process.h"
+#include "node_process-inl.h"
 #include "util-inl.h"
 #include "uv.h"
 #include "v8-fast-api-calls.h"
diff --git a/src/node_process_object.cc b/src/node_process_object.cc
index 3d573d534601..587b4ecb9368 100644
--- a/src/node_process_object.cc
+++ b/src/node_process_object.cc
@@ -4,7 +4,7 @@
 #include "node_internals.h"
 #include "node_metadata.h"
 #include "node_options-inl.h"
-#include "node_process.h"
+#include "node_process-inl.h"
 #include "node_revert.h"
 #include "util-inl.h"
 
diff --git a/src/node_task_queue.cc b/src/node_task_queue.cc
index 004eb6a6529f..9bbdb3180217 100644
--- a/src/node_task_queue.cc
+++ b/src/node_task_queue.cc
@@ -4,7 +4,7 @@
 #include "node_errors.h"
 #include "node_external_reference.h"
 #include "node_internals.h"
-#include "node_process.h"
+#include "node_process-inl.h"
 #include "util-inl.h"
 #include "v8.h"
 
diff --git a/src/signal_wrap.cc b/src/signal_wrap.cc
index cdf063c035a5..e8a1500d2e99 100644
--- a/src/signal_wrap.cc
+++ b/src/signal_wrap.cc
@@ -22,7 +22,7 @@
 #include "async_wrap-inl.h"
 #include "env-inl.h"
 #include "handle_wrap.h"
-#include "node_process.h"
+#include "node_process-inl.h"
 #include "util-inl.h"
 #include "v8.h"
 
diff --git a/src/uv.cc b/src/uv.cc
index 0e6672c47269..2b0c424587e4 100644
--- a/src/uv.cc
+++ b/src/uv.cc
@@ -23,7 +23,7 @@
 #include "env-inl.h"
 #include "node.h"
 #include "node_external_reference.h"
-#include "node_process.h"
+#include "node_process-inl.h"
 
 namespace node {