readline: make Symbol.asyncIterator support stable

PR-URL: #26989
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Masashi Hirano <shisama07@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

doc/api/readline.md

@@ -312,9 +312,13 @@ The `rl.write()` method will write the data to the `readline` `Interface`'s
 ### rl\[Symbol.asyncIterator\]()
 <!-- YAML
 added: v11.4.0
+changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/26989
+    description: Symbol.asyncIterator support is no longer experimental.
 -->
 
-> Stability: 1 - Experimental
+> Stability: 2 - Stable
 
 * Returns: {AsyncIterator}
 

lib/readline.js

@@ -33,7 +33,6 @@ const {
 } = require('internal/errors').codes;
 const { inspect, inherits } = require('util');
 const { validateString } = require('internal/validators');
-const { emitExperimentalWarning } = require('internal/util');
 const { Buffer } = require('buffer');
 const EventEmitter = require('events');
 const {
@@ -1030,8 +1029,6 @@ Interface.prototype._ttyWrite = function(s, key) {
 };
 
 Interface.prototype[Symbol.asyncIterator] = function() {
-  emitExperimentalWarning('readline Interface [Symbol.asyncIterator]');
-
   if (this[kLineObjectStream] === undefined) {
     if (Readable === undefined) {
       Readable = require('stream').Readable;