util: runtime deprecation util._extend

PR-URL: #50488
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
Reviewed-By: Yagiz Nizipli <yagiz.nizipli@sentry.io>
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>

doc/api/deprecations.md

@@ -1282,6 +1282,9 @@ The [`util.log()`][] API is deprecated.
 
 <!-- YAML
 changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/50488
+    description: Runtime deprecation.
   - version: v6.12.0
     pr-url: https://github.com/nodejs/node/pull/10116
     description: A deprecation code has been assigned.
@@ -1290,7 +1293,7 @@ changes:
     description: Documentation-only deprecation.
 -->
 
-Type: Documentation-only
+Type: Runtime
 
 The [`util._extend()`][] API is deprecated.
 

lib/util.js

@@ -375,7 +375,9 @@ function _exceptionWithHostPort(...args) {
 module.exports = {
   _errnoException,
   _exceptionWithHostPort,
-  _extend,
+  _extend: deprecate(_extend,
+                     'The `util._extend` API is deprecated. Please use Object.assign() instead.',
+                     'DEP0060'),
   callbackify,
   debug: debuglog,
   debuglog,