From 6669cd138e918c6252e7c1dcb4bdfbc673105bad Mon Sep 17 00:00:00 2001
From: Juan José Arboleda <soyjuanarbol@gmail.com>
Date: Fri, 29 Nov 2019 16:30:25 -0500
Subject: lib: add warning on dynamic import es modules

PR-URL: https://github.com/nodejs/node/pull/30720
Reviewed-By: Guy Bedford <guybedford@gmail.com>
---
 lib/internal/process/esm_loader.js | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'lib')

diff --git a/lib/internal/process/esm_loader.js b/lib/internal/process/esm_loader.js
index 19099d9cbd..404be77338 100644
--- a/lib/internal/process/esm_loader.js
+++ b/lib/internal/process/esm_loader.js
@@ -24,6 +24,12 @@ exports.initializeImportMetaObject = function(wrap, meta) {
 
 exports.importModuleDynamicallyCallback = async function(wrap, specifier) {
   assert(calledInitialize === true || !userLoader);
+  if (!calledInitialize) {
+    process.emitWarning(
+      'The ESM module loader is experimental.',
+      'ExperimentalWarning', undefined);
+    calledInitialize = true;
+  }
   const { callbackMap } = internalBinding('module_wrap');
   if (callbackMap.has(wrap)) {
     const { importModuleDynamically } = callbackMap.get(wrap);
-- 
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