doc: runtime deprecate util.isUndefined

Author: marco-ippolito

doc/api/deprecations.md

@@ -1288,6 +1288,9 @@ The [`util.isSymbol()`][] API is deprecated.
 
 <!-- YAML
 changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/50488
+    description: Runtime deprecation.
   - version:
     - v6.12.0
     - v4.8.6
@@ -1300,7 +1303,7 @@ changes:
     description: Documentation-only deprecation.
 -->
 
-Type: Documentation-only
+Type: Runtime
 
 The [`util.isUndefined()`][] API is deprecated.
 

lib/util.js

@@ -385,7 +385,7 @@ module.exports = {
   isNumber: deprecate(isNumber, 'The `util.isNumber API is deprecated.', 'DEP0052'),
   isString: deprecate(isString, 'The `util.isString API is deprecated.', 'DEP0056'),
   isSymbol: deprecate(isSymbol, 'The `util.isSymbol API is deprecated.', 'DEP0057'),
-  isUndefined,
+  isUndefined: deprecate(isUndefined, 'The `util.isUndefined API is deprecated.', 'DEP0058'),
   isRegExp: deprecate(types.isRegExp, 'The `util.isRegExp API is deprecated.', 'DEP0055'),
   isObject: deprecate(isObject, 'The `util.isObject API is deprecated.', 'DEP0053'),
   isDate: deprecate(types.isDate, 'The `util.isDate API is deprecated.', 'DEP0047'),